android-servlet-jsp-mysql实现登录注册功能

安卓项目图：

安卓端Get请求服务端登录代码：

package com.example.kkkkkkkkk;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.Serializable;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.json.JSONObject;
import com.example.kkkkkkkkk.StreamTools;
import android.support.v7.app.ActionBarActivity;
import android.text.TextUtils;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {
    protected static final int ERROR = 1;
    protected static final int SUCCESS = 2;
    protected static final int SUCCESSS = 0;
    BufferedReader bufferReader; 
    private EditText account;
    private EditText password;
    private Button   register;
    private Handler handler=new Handler(){
        public void handleMessage(android.os.Message msg){
            switch(msg.what){
            case SUCCESS:
                Toast.makeText(MainActivity.this,(String)msg.obj, 1).show();                        
                break;                
            case ERROR:
                Toast.makeText(MainActivity.this,"发送失败", 1).show();
                break;
            }    
    };        
};
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    account = (EditText)findViewById(R.id.account);
    password=(EditText)findViewById(R.id.password);
    register = (Button)findViewById(R.id.login);        
}
public void register(View view){
    Intent intent=new Intent(this, RegisterActivity.class);
    startActivity(intent);    
}
public void login(View view){
    final String qq=account.getText().toString().trim();
    final String pwd=password.getText().toString().trim();
    if(TextUtils.isEmpty(qq)){
        Toast.makeText(this,"用户名为空登录失败", 0).show();    
        return;    
    }
    if(TextUtils.isEmpty(pwd)){
        Toast.makeText(this,"密码为空登陆失败", 0).show();    
        return;    
    }    
    new Thread(){
        Map<String, Object> listItem = new HashMap<String, Object>();
          List<Map<String, Object>> listItems = new ArrayList<Map<String, Object>>();
        public void run(){
            try{
                String path="http://192.168.1.4:8080/xianfengYan/LoginAction?username="+qq+"&pswd="+pwd;
                URL url=new URL(path);
                HttpURLConnection conn=(HttpURLConnection) url.openConnection();
                conn.setRequestMethod("GET");
                conn.setRequestProperty("User-Agent","Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; KB974487)");
                int code=conn.getResponseCode();
                if(code==200){
                    InputStream is=conn.getInputStream();
                    String result=StreamTools.readInputStream(is);        
                    if(!result.equals("用户名不存在请重新输入，登陆失败")&&!result.equals("密码错误，登陆失败")){
                        JSONObject demoJson = new JSONObject(result);                        
                        Intent intent=new Intent(MainActivity.this,Activity01.class);                    
                        intent.putExtra("用户名",demoJson.getString("用户名"));
                        System.out.println(demoJson.getString("用户名"));
                        intent.putExtra("密码",demoJson.getString("密码"));
                        System.out.println(demoJson.getString("密码"));
                        intent.putExtra("真实姓名",demoJson.getString("真实姓名"));
                        System.out.println(demoJson.getString("真实姓名"));
                        intent.putExtra("性别",demoJson.getString("性别"));
                        System.out.println(demoJson.getString("性别"));
                        //bundle.putSerializable("hh", (Serializable) msg.obj);                
                        //intent.putExtras(bundle);
                        
                        
                        startActivity(intent);
                    }else{                    
                         Message msg=Message.obtain();
                         msg.what=SUCCESS;
                         msg.obj=result;
                         handler.sendMessage(msg);
                    }
               }else{
                    Message msg=Message.obtain();
                    msg.what=ERROR;
                    handler.sendMessage(msg);
               }    
        }catch(Exception e){
            e.printStackTrace();
            Message msg=Message.obtain();
            msg.what=ERROR;
            handler.sendMessage(msg);
        }
   };        
   }.start();

   }
}

安卓端Get请求注册代码：

package com.example.kkkkkkkkk;

import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
import android.widget.RadioGroup.OnCheckedChangeListener;
import com.example.kkkkkkkkk.MainActivity;
import com.example.kkkkkkkkk.StreamTools;
public class RegisterActivity extends Activity implements OnCheckedChangeListener{    
    protected static final int ERROR = 1;
    protected static final int SUCCESS = 2;
    private EditText et_pwd;
    private EditText et_qq;
    private EditText et_name;
    private EditText et_apwd;
    private RadioButton radio0;
    private RadioButton radio1;
    private Button Button1;
    private RadioGroup rg;
    String temp="";
    private Handler handler=new Handler(){    
        public void handleMessage(android.os.Message msg){
            switch(msg.what){
            case SUCCESS:
                Toast.makeText(RegisterActivity.this,(String)msg.obj, 1).show();
                if(msg.obj.equals("注册成功")){
                //System.out.println("1111"+msg.obj);
                Intent intent=new Intent(RegisterActivity.this,MainActivity.class);
                startActivity(intent);
                }
                break;
            case ERROR:
                Toast.makeText(RegisterActivity.this,"登录失败", 1).show();
                break;
            }
        };        
    };
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);
        et_qq = (EditText)findViewById(R.id.et_qq);
        et_pwd=(EditText)findViewById(R.id.et_pwd);
        et_name=(EditText)findViewById(R.id.et_name);
        et_apwd=(EditText)findViewById(R.id.et_apwd);
        rg=(RadioGroup) findViewById(R.id.radioGroup1) ;
        rg.setOnCheckedChangeListener(this);
        Button1=(Button)findViewById(R.id.button1);
             
    }
    public void Button1(View view){
        Intent intent=new Intent(this, MainActivity.class);
        startActivity(intent);    
    }
     public void onCheckedChanged(RadioGroup group,int checkedId){
         switch(checkedId){
         case R.id.radio0:
             temp="男"; 
            break;
        case R.id.radio1:
             temp="女";
             break;
        }
        
    }
        
        public void regin(View view) throws UnsupportedEncodingException{
            
            final String qq=et_qq.getText().toString().trim();
            final String pwd=et_pwd.getText().toString().trim();
            final String name=et_name.getText().toString().trim();
            final String apwd=et_apwd.getText().toString().trim();
            final String tem =URLEncoder.encode(URLEncoder.encode(temp, "UTF-8"), "UTF-8");            
            if(TextUtils.isEmpty(qq)){
                Toast.makeText(this,"用户名不能为空", 0).show();
                return;                    
            }
            if(TextUtils.isEmpty(pwd)){
                Toast.makeText(this,"密码不能为空", 0).show();
                return;                    
            }            
            if(TextUtils.equals(pwd, apwd)==false){
                Toast.makeText(this,"两次输入密码不同", 0).show();
                return;
            }
            if(pwd.length()<6){
                Toast.makeText(this,"密码位数小于6安全等级太低", 0).show();
                return;        
            }
            if(temp==""){
                Toast.makeText(this,"请选择性别", 0).show();
                return;
                }
        new Thread(){
            public void run(){
                try{
                    String path="http://192.168.1.4:8080/xianfengYan/RegisterAction?username="+qq+"&realname="+name+"&pswd="+pwd+"&sex="+tem;
                    URL url=new URL(path);
                    HttpURLConnection conn=(HttpURLConnection) url.openConnection();
                    conn.setRequestMethod("GET");
                    conn.setRequestProperty("User-Agent","Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; KB974487)");
                    int code=conn.getResponseCode();
                    if(code==200){
                        InputStream is=conn.getInputStream();
                        String result=StreamTools.readInputStream(is);
                        Message msg=Message.obtain();
                        msg.what=SUCCESS;
                        msg.obj=result;
                        handler.sendMessage(msg);
                   }else{
                        Message msg=Message.obtain();
                        msg.what=ERROR;
                        handler.sendMessage(msg);
                   }    
            }catch(Exception e){
                e.printStackTrace();
                Message msg=Message.obtain();
                msg.what=ERROR;
                handler.sendMessage(msg);
            }
    };        
    }.start();
   }
}

输入流工具类：

package com.example.kkkkkkkkk;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;

public class StreamTools {
    // 把输入流的内容 转化成 字符串
    public static String readInputStream(InputStream is) {
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            int len = 0;
            byte[] buffer = new byte[1024];
            while ((len = is.read(buffer)) != -1) {
                baos.write(buffer, 0, len);
            }
            is.close();
            baos.close();
            byte[] result = baos.toByteArray();
            // 试着解析 result 里面的字符串.
            String temp = new String(result);
            return temp;
        } catch (Exception e) {
            e.printStackTrace();
            return "获取失败";
        }
    }
}

安卓端登录成功返回界面:返回用户的注册信息

package com.example.kkkkkkkkk;

import java.io.Serializable;

import org.json.JSONObject;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.EditText;
import android.widget.TextView;

public class Activity01 extends Activity{

        private TextView tv_username; 
        private TextView tv_realname;  
        private TextView tv_password;  
        private TextView tv_sex;  
        @Override  
        protected void onCreate(Bundle savedInstanceState) {  
            // TODO Auto-generated method stub  
            super.onCreate(savedInstanceState);  
            setContentView(R.layout.activity_01);  
            //提取数据  
            Intent intent=getIntent(); 
           // Bundle bundle = intent.getExtras();
            //Serializable name=bundle.getSerializable("hh");
      String name1=intent.getStringExtra("用户名");
      String name2=intent.getStringExtra("密码");
      String name3=intent.getStringExtra("真实姓名");
      String name4=intent.getStringExtra("性别");
        //JSONObject json = JSONObject.fromObject(name);
     
            tv_username=(TextView) findViewById(R.id.tv_username);
            tv_realname=(TextView) findViewById(R.id.tv_realname);
            tv_password=(TextView) findViewById(R.id.tv_password);
            tv_sex=(TextView) findViewById(R.id.tv_sex);
            tv_username.setText("用户名："+name1);
            tv_realname.setText("密码："+name2);
            tv_password.setText("真实姓名："+name3);
            tv_sex.setText("性别："+name4);
            //过滤的方法，在LogCat(deprecated)的Filter中输入--进行过滤，这不是标准的调试方法  
            //System.out.println("--name->>"+name);              
        }        
    }  

服务端项目图：

    

数据库连接类：

package com.product.jdbc.dbutil;

import java.lang.reflect.Field;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class JdbcUtils {

    // 表示定义数据库的用户名
    private final String USERNAME = "root";
    // 定义数据库的密码
    private final String PASSWORD = "123";
    // 定义数据库的驱动信息
    private final String DRIVER = "com.mysql.jdbc.Driver";
    // 定义访问数据库的地址
    private final String URL = "jdbc:mysql://localhost:3306/jdbc_db";
    // 定义数据库的链接
    private Connection connection;
    // 定义sql语句的执行对象
    private PreparedStatement pstmt;
    // 定义查询返回的结果集合
    private ResultSet resultSet;
    // 实现批处理操作的功能
    private Statement stmt;

    public JdbcUtils() {
        try {
            Class.forName(DRIVER);
            System.out.println("注册驱动成功!!");
        } catch (Exception e) {
            // TODO: handle exception
        }
    }

    // 定义获得数据库的链接
    public Connection getConnection() {
        try {
            connection = DriverManager.getConnection(URL, USERNAME, PASSWORD);
        } catch (Exception e) {
            // TODO: handle exception
        }
        return connection;
    }

    public boolean deleteByBatch(String[] sql) throws SQLException{
        boolean flag = false;
        stmt = connection.createStatement();
        if(sql!=null){
            for(int i=0;i<sql.length;i++){
                stmt.addBatch(sql[i]);
            }
        }
        int[] count = stmt.executeBatch();
        if(count!=null){
            flag = true;
        }
        return flag;
    }
    /**
     * 完成对数据库的表的添加删除和修改的操作
     * 
     * @param sql
     * @param params
     * @return
     * @throws SQLException
     */
    public boolean updateByPreparedStatement(String sql, List<Object> params)
            throws SQLException {
        boolean flag = false;
        int result = -1;// 表示当用户执行添加删除和修改的时候所影响数据库的行数
        pstmt = connection.prepareStatement(sql);
        int index = 1;
        if (params != null && !params.isEmpty()) {
            for (int i = 0; i < params.size(); i++) {
                pstmt.setObject(index++, params.get(i));
            }
        }
        result = pstmt.executeUpdate();
        flag = result > 0 ? true : false;
        return flag;
    }

    /**
     * 查询返回单条记录
     * 
     * @param sql
     * @param params
     * @return
     * @throws SQLException
     */
    public Map<String, Object> findSimpleResult(String sql, List<Object> params)
            throws SQLException {
        Map<String, Object> map = new HashMap<String, Object>();
        int index = 1;
        pstmt = connection.prepareStatement(sql);
        if (params != null && !params.isEmpty()) {
            for (int i = 0; i < params.size(); i++) {
                pstmt.setObject(index++, params.get(i));
            }
        }
        resultSet = pstmt.executeQuery();// 返回查询结果
        ResultSetMetaData metaData = resultSet.getMetaData();
        int col_len = metaData.getColumnCount();// 获得列的名称
        while (resultSet.next()) {
            for (int i = 0; i < col_len; i++) {
                String cols_name = metaData.getColumnName(i + 1);
                Object cols_value = resultSet.getObject(cols_name);
                if (cols_value == null) {
                    cols_value = "";
                }
                map.put(cols_name, cols_value);
            }
        }
        return map;
    }

    /**
     * 查询返回多行记录
     * 
     * @param sql
     * @param params
     * @return
     * @throws SQLException
     */
    public List<Map<String, Object>> findMoreResult(String sql,
            List<Object> params) throws SQLException {
        List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
        int index = 1;
        pstmt = connection.prepareStatement(sql);
        if (params != null && !params.isEmpty()) {
            for (int i = 0; i < params.size(); i++) {
                pstmt.setObject(index++, params.get(i));
            }
        }
        resultSet = pstmt.executeQuery();
        ResultSetMetaData metaData = resultSet.getMetaData();
        int cols_len = metaData.getColumnCount();
        while (resultSet.next()) {
            Map<String, Object> map = new HashMap<String, Object>();
            for (int i = 0; i < cols_len; i++) {
                String cols_name = metaData.getColumnName(i + 1);
                Object cols_value = resultSet.getObject(cols_name);
                if (cols_value == null) {
                    cols_value = "";
                }
                map.put(cols_name, cols_value);
            }
            list.add(map);
        }
        return list;
    }

    // jdbc的封装可以用反射机制来封装：
    public <T> T findSimpleRefResult(String sql, List<Object> params,
            Class<T> cls) throws Exception {
        T resultObject = null;
        int index = 1;
        pstmt = connection.prepareStatement(sql);
        if (params != null && !params.isEmpty()) {
            for (int i = 0; i < params.size(); i++) {
                pstmt.setObject(index++, params.get(i));
            }
        }
        resultSet = pstmt.executeQuery();
        ResultSetMetaData metaData = resultSet.getMetaData();
        int cols_len = metaData.getColumnCount();
        while (resultSet.next()) {
            // 通过反射机制创建实例
            resultObject = cls.newInstance();
            for (int i = 0; i < cols_len; i++) {
                String cols_name = metaData.getColumnName(i + 1);
                Object cols_value = resultSet.getObject(cols_name);
                if (cols_value == null) {
                    cols_value = "";
                }
                Field field = cls.getDeclaredField(cols_name);
                field.setAccessible(true);// 打开javabean的访问private权限
                field.set(resultObject, cols_value);
            }
        }
        return resultObject;
    }

    /**
     * 通过反射机制访问数据库
     * 
     * @param <T>
     * @param sql
     * @param params
     * @param cls
     * @return
     * @throws Exception
     */
    public <T> List<T> findMoreRefResult(String sql, List<Object> params,
            Class<T> cls) throws Exception {
        List<T> list = new ArrayList<T>();
        int index = 1;
        pstmt = connection.prepareStatement(sql);
        if (params != null && !params.isEmpty()) {
            for (int i = 0; i < params.size(); i++) {
                pstmt.setObject(index++, params.get(i));
            }
        }
        resultSet = pstmt.executeQuery();
        ResultSetMetaData metaData = resultSet.getMetaData();
        int cols_len = metaData.getColumnCount();
        while (resultSet.next()) {
            T resultObject = cls.newInstance();
            for (int i = 0; i < cols_len; i++) {
                String cols_name = metaData.getColumnName(i + 1);
                Object cols_value = resultSet.getObject(cols_name);
                if (cols_value == null) {
                    cols_value = "";
                }
                Field field = cls.getDeclaredField(cols_name);
                field.setAccessible(true);
                field.set(resultObject, cols_value);
            }
            list.add(resultObject);
        }
        return list;
    }

    public void releaseConn() {
        if (resultSet != null) {
            try {
                resultSet.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        if (stmt != null) {
            try {
                stmt.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        if (pstmt != null) {
            try {
                pstmt.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        if (connection != null) {
            try {
                connection.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

 登录页面的servlet:

package com.product.login.action;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.product.login.dao.LoginDao;
import com.product.login.service.LoginService;

public class LoginAction extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private LoginService service;
    public LoginAction() {
        super();
    }
    public void destroy() {
        super.destroy(); 
    }
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        this.doPost(request, response);

    }
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String path = request.getContextPath();
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html; charset=utf-8");
        PrintWriter out = response.getWriter();
        String username = request.getParameter("username");
        String pswd = request.getParameter("pswd");
        System.out.println("username = " + username + " pswd = " + pswd);
        List<Object> params = new ArrayList<Object>();
        params.add(username);
        params.add(pswd);

        boolean flag = service.LoginUser(params);

        boolean fla = service.LoginCat(params);
        boolean fl = service.LoginDog(params);
        List<String> list = service.user(params);

        // JSONObject jsonobj = new JSONObject();
        // if (list.size() != 0) {
        // jsonobj.put("用户名", list.get(0));
        // jsonobj.put("密码", list.get(1));
        // jsonobj.put("真实姓名", list.get(2));
        // jsonobj.put("性别", list.get(3));
        // }
        HttpSession session = request.getSession();
        if (list.size() != 0) {
            session.setAttribute("uname", list.get(0));
            session.setAttribute("realname", list.get(1));
            session.setAttribute("pswd", list.get(2));
            session.setAttribute("sex", list.get(3));
        }
        if (flag == true) {
            response.sendRedirect(path + "/xinxi.jsp");
        }
        if (fla == true) {
            out.print("用户名不存在请重新输入，登陆失败");
        }
        if (fl == true) {
            out.print("密码错误，登陆失败");
        }

        out.flush();
        out.close();
    }
    public void init() throws ServletException {
        // Put your code here
        service = new LoginDao();
    }

}

登录页面的数据操作层：

package com.product.login.dao;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import com.product.jdbc.dbutil.JdbcUtils;
import com.product.login.service.LoginService;

public class LoginDao implements LoginService {
    private JdbcUtils jdbcUtils = null;

    public LoginDao() {
        // TODO Auto-generated constructor stub
        jdbcUtils = new JdbcUtils();
    }

    /*
     * ����û���ע���Dao�ı�д
     * 
     * @see
     * com.product.register.service.RegisterService#registerUser(java.util.List)
     */
    public boolean LoginUser(List<Object> params) {
        // TODO Auto-generated method stub
        boolean flag = false;
        jdbcUtils.getConnection();
        String sql1 = "select * from userinfo where username=? and pswd=?";
        try {
            Map<String, Object> map = jdbcUtils.findSimpleResult(sql1, params);
            flag = !map.isEmpty() ? true : false;
        } catch (Exception e1) {
            e1.printStackTrace();
        } finally {
            jdbcUtils.releaseConn();
        }
        return flag;
    }

    @SuppressWarnings("null")
    public boolean LoginCat(List<Object> params) {
        boolean fla = false;
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        ResultSet rs1 = null;
        conn = jdbcUtils.getConnection();
        try {
            stmt = conn.createStatement();
            rs = stmt.executeQuery("select * from userinfo where username='"
                    + params.get(0) + "'");
            if (rs.next() == false) {
                fla = true;
            }
        } catch (Exception e1) {
            e1.printStackTrace();
        } finally {
            jdbcUtils.releaseConn();
        }
        return fla;
    }

    public boolean LoginDog(List<Object> params) {
        boolean fl = false;
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        ResultSet rs1 = null;
        conn = jdbcUtils.getConnection();
        try {
            stmt = conn.createStatement();
            rs = stmt.executeQuery("select * from userinfo where username='"
                    + params.get(0) + "'");
            if (rs.next() == true) {
                rs1 = stmt.executeQuery("select * from userinfo where pswd='"
                        + params.get(1) + "'");
                if (rs1.next() == false) {
                    fl = true;
                }
            }
        } catch (Exception e1) {
            e1.printStackTrace();
        } finally {
            jdbcUtils.releaseConn();
        }
        return fl;
    }

    // public List<User> user(List<Object> params) {
    // Connection conn = null;
    // Statement stmt = null;
    // ResultSet rs = null;
    // List<User> userList = new ArrayList<>();
    // conn = jdbcUtils.getConnection();
    //
    // try {
    // stmt = conn.createStatement();
    // rs = stmt.executeQuery("select * from userinfo where username='"
    // + params.get(0) + "'");
    // while (rs.next()) {
    // String username = rs.getString("username");
    // String password = rs.getString("password");
    // String realname = rs.getString("realname");
    // String sex = rs.getString("sex");
    // User user = new User(username, password, realname, sex);
    // userList.add(user);
    // }
    // } catch (Exception e1) {
    // e1.printStackTrace();
    // } finally {
    // jdbcUtils.releaseConn();
    // }
    // return userList;
    //
    // }
    public List<String> user(List<Object> params) {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        conn = jdbcUtils.getConnection();
        List<String> list = new ArrayList<String>();
        try {
            stmt = conn.createStatement();
            rs = stmt.executeQuery("select * from userinfo where username='"
                    + params.get(0) + "'");
            System.out.println(params.get(0));
            while (rs.next()) {
                String username = rs.getString("username");
                System.out.println(username);
                String password = rs.getString("pswd");
                System.out.println(password);
                String realname = rs.getString("realname");
                System.out.println(realname);
                String sex = rs.getString("sex");
                System.out.println(sex);
                // User user = new User(username, password, realname, sex);
                list.add(username);
                list.add(password);
                list.add(realname);
                list.add(sex);
                System.out.println(list);

            }
        } catch (Exception e1) {
            e1.printStackTrace();
        } finally {
            jdbcUtils.releaseConn();
        }
        return list;
    }
}

登录页面的服务层：

package com.product.login.service;

import java.util.List;

public interface LoginService {
    public boolean LoginUser(List<Object> params);

    public boolean LoginCat(List<Object> params);

    public boolean LoginDog(List<Object> params);

    public List<String> user(List<Object> params);

}

注册页面的servlet:

package com.product.register.action;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.product.register.dao.RegisterDao;
import com.product.register.service.RegisterService;

public class RegisterAction extends HttpServlet {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private RegisterService service;

    /**
     * Constructor of the object.
     */
    public RegisterAction() {
        super();
    }

    /**
     * Destruction of the servlet. <br>
     */
    public void destroy() {
        super.destroy(); // Just puts "destroy" string in log
        // Put your code here
    }

    /**
     * The doGet method of the servlet. <br>
     * 
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request
     *            the request send by the client to the server
     * @param response
     *            the response send by the server to the client
     * @throws ServletException
     *             if an error occurred
     * @throws IOException
     *             if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        this.doPost(request, response);
    }

    /**
     * The doPost method of the servlet. <br>
     * 
     * This method is called when a form has its tag value method equals to
     * post.
     * 
     * @param request
     *            the request send by the client to the server
     * @param response
     *            the response send by the server to the client
     * @throws ServletException
     *             if an error occurred
     * @throws IOException
     *             if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String path = request.getContextPath();
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html; charset=utf-8");
        PrintWriter out = response.getWriter();
        String username = request.getParameter("username");
        String realname = request.getParameter("realname");
        String pswd = request.getParameter("pswd");
        String pswds = request.getParameter("pswds");
        // String sex = new
        // String(request.getParameter("sex").getBytes("iso-8859-1"), "utf-8");
        // String sex = request.getParameter("sex");
        // String sex=java.net.URLDecoder.decode(request.getParameter("sex"),
        // "UTF-8");
        // String sex = URLDecoder.decode(
        // URLDecoder.decode(request.getParameter("sex"), "UTF-8"),
        // "UTF-8");
        // String sex = new String(request.getParameter("name").getBytes(
        // "ISO-8859-1"), "UTF-8");
        String sex = request.getParameter("sex");

        System.out.println("username = " + username + "  realname = "
                + realname + " pswd = " + pswd + " sex = " + sex);
        List<Object> params = new ArrayList<Object>();
        params.add(username);
        params.add(pswd);
        params.add(realname);
        params.add(sex);
        // params.add(b1);
        // params.add(b2);
        boolean flag = service.registerUser(params);
        if (flag) {
            // response.getOutputStream().write("register success".getBytes());
            out.print("注册成功");
            response.sendRedirect(path + "/hh.jsp");
        } else {
            out.print("用户名重复,注册失败");
        }
        out.flush();
        out.close();
    }

    /**
     * Initialization of the servlet. <br>
     * 
     * @throws ServletException
     *             if an error occurs
     */
    public void init() throws ServletException {
        // Put your code here
        service = new RegisterDao();
    }

}

注册页面的数据操作层：

package com.product.register.dao;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.List;
import java.util.Map;

import com.mysql.jdbc.PreparedStatement;
import com.product.jdbc.dbutil.JdbcUtils;
import com.product.register.service.RegisterService;

public class RegisterDao implements RegisterService {
    private JdbcUtils jdbcUtils = null;

    public RegisterDao() {
        // TODO Auto-generated constructor stub
        jdbcUtils = new JdbcUtils();
    }

    /* 完成用户对注册的Dao的编写
     * @see com.product.register.service.RegisterService#registerUser(java.util.List)
     */
    @Override
    public boolean registerUser(List<Object> params) {
        // TODO Auto-generated method stub
        Connection conn=null;
        Statement stmt=null;
        ResultSet rs=null;
        boolean flag = false;
    
        conn=jdbcUtils.getConnection();
        try {
            stmt=conn.createStatement();
            rs = stmt.executeQuery("select * from userinfo where username='"+params.get(0)+"'");
            //System.out.println(params.get(0));
            if(rs.next()==true){        
                flag=false;
            }else{
                flag = jdbcUtils.updateByPreparedStatement("insert into userinfo(username, pswd, realname,sex) values (?, ?, ?,?)", params);                    
            }
        } catch (Exception e1) {
            e1.printStackTrace();
        }        
            finally{
                    jdbcUtils.releaseConn();
                   }                
        return flag;
    }
}

注册页面的服务层：

package com.product.register.service;

import java.util.List;


public interface RegisterService {
    public boolean registerUser(List<Object> params);
}

jsp页面：

登录界面：hh.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8" %>
<%
    String path = request.getContextPath();
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>后台管理系统</title>
<meta http-equiv=Content-Type content="text/html; charset=utf-8">

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<style type="text/css">
.neon {
    FILTER: glow(color = #002E60, strength    = 3)
}

DIV {
    WIDTH: 70px
}

BODY {
    MARGIN: 0px
}

BODY {
    MARGIN-TOP: 0px;
    SCROLLBAR-FACE-COLOR: #005fc5;
    FONT-SIZE: 12px;
    BACKGROUND: #ffffff;
    SCROLLBAR-HIGHLIGHT-COLOR: #799ae1;
    SCROLLBAR-SHADOW-COLOR: #799ae1;
    SCROLLBAR-3DLIGHT-COLOR: #005fc5;
    SCROLLBAR-ARROW-COLOR: #ffffff;
    SCROLLBAR-TRACK-COLOR: #aabfec;
    SCROLLBAR-DARKSHADOW-COLOR: #799ae1
}
</STYLE>
<LINK href="<%=path%>/images/duan_1.css" type=text/css rel=stylesheet>
<META content="MSHTML 6.00.2800.1106" name=GENERATOR>
<style type="text/css">
.style6 {
    COLOR: #0000ff
}

.STYLE7 {
    COLOR: #003366;
    font-size: 12px;
}
</style>
<script type="text/javascript">
    function dosubmit() {
        var th = document.form2;
        if (th.username.value == "") {
            alert("用户名不能为空");
            th.username.focus();
            return;
        }
        
        if (th.pswd.value == "") {
            alert("密码不能为空");
            th.pswd.focus();
            return;
        }
        th.action="<%=path%>/select"
        th.submit();
    }
</script>
</head>

<body bgColor=#ffffff
    onload="MM_preloadImages('<%=path%>/images/ok_2.jpg', '<%=path%>/images/fh_2.jpg')">
    <form action="LoginAction" name="form2" method="Post">
        <table height=470 cellSpacing=0 cellPadding=0 width=580 aligen=center
            border=0>
            <tbody>
                <tr>
                    <td colSpan=3 height=9 />
                </tr>
                <tr>
                    <td vAlign=top width=8 background="<%=path%>/images/dhpddw.gif"
                        rowSpan=2>
                        <!-- DWLayoutEmptyCell --> &nbsp;</td>
                    <td background="<%=path%>/images/h-1.gif" height=9></td>
                    <td width=9 height=9><IMG height=9
                        src="<%=path%>/images/jiao.gif" width=9>
                    </td>
                </tr>
                <tr>
                    <td vAlign=top align=right width=743 height=452>
                        <table cellSpacing=0 cellPadding=0 width=556 border=0>
                            <!-- DWLayoutTable -->
                            <tbody>
                                <tr>
                                    <td vAligh=bottom width=548 height=27><IMG height=10
                                        src="<%=path%>/images/jt2.gif" width=10> <span
                                        class="1bt">用户登录</span>
                                    </td>
                                    <td width=8 rowSpan=3>&nbsp;</td>
                                </tr>
                                <tr>
                                    <td bgColor="#ffffff" height=22></td>
                                </tr>
                                <tr>
                                    <td class=unnamed1 vAligh=top height=9>
                                        <table width="99%" border=0 cellPadding=4 cellSpacing=1
                                            bgColor="#0867b3">
                                            <tbody>
                                                <TR bgColor=#ffffff height=20>
                                                    <TD width=14% noWrap class="STYLE7">用户名</TD>
                                                    <TD width=24% valign="top" noWrap><INPUT class=text2
                                                        maxLength=20 size=18 name="username" minLength="1">
                                                    </TD>
                                                    <TD width=62% noWrap><span class="STYLE7">必须填写！</span>
                                                    </TD>
                                                </TR>
                                                
                                                <TR bgColor=#ffffff height=20>
                                                    <TD height="2" noWrap><span class="STYLE7">密码 </span>
                                                    </TD>
                                                    <TD height="2" valign="top" noWrap><INPUT
                                                        type="password" class=text2 maxLength=20 size=18
                                                        name="password" minLength="1">
                                                    </TD>
                                                    <TD height="2" noWrap><span class="STYLE7">必填项</span>             <br>
                                                    </TD>
                                                </TR>
                                            </tbody>                                        
                                        </table><br>                                                        
                                </tr>
                                <TR>
                                    <TD height=20 align="center"><a
                                        href="javascript:dosubmit();"> <img
                                            src="<%=path%>/images/hh2.jpg" name="Image8" width="60"
                                            height="22" border="0"></a>&nbsp; <a
                                            href="<%=path%>/pass.jsp"><img
                                            src="<%=path%>/images/hh1.jpg" name="Image9" width="60"
                                            height="22" border="0"> </a>
                                    </TD>
                                    <TD></TD>
                                </TR>
                            </tbody>
                        </table>
                    </td>
                    <TD width=9 background="<%=path%>/images/s-1.gif"></TD>
                </tr>
            </tbody>
        </table>
    </form>
</body>
</html>

注册界面：login.jsp

<%
    String path = request.getContextPath();
%>
<html>  
  <head>  
    <title>用户登录</title>  
 
    <meta http-equiv=Content-Type content="text/html; charset=utf-8">
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--  
    <link rel="stylesheet" type="text/css" href="styles.css">  
    -->  
  </head> 
  <script type="text/javascript">
    function dosubmit() {
        var th = document.form2;
        if (th.username.value == "") {
            alert("用户名不能为空");
            th.username.focus();
            return;
        }

        if (th.password.value == "") {
            alert("密码不能为空");
            th.password.focus();
            return;
        }
    
        th.action="/LoginAction";
        th.submit();

    }
</script>  
 <body bgcolor="#e3e3e3"> 
  

<form action="LoginAction"name="form2" method="Post"> 

<table> 
   <caption>用户登录</caption>  
   <tr><td>用户名：</td><td><input type="text" name="username" size="20"/></td></tr>  
   <tr><td>密码:</td><td><input type="password" name="password" size="21"/></td></tr>  
   <tr><td><a href="javascript:dosubmit();"><input type="submit" value="登录"/></a></td><td><input type="button" value="注册" onclick="window.location='pass.jsp'"></td></tr>  
   </table>  
   </form>  
   </body>  
</html>  

用户信息返回页面：xinxi.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
  <head>
    <title>My JSP 'xinxi.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
<script type="text/javascript">
     
     
     
</script>
  </head>
 
  
  <body>
    <%
    String name = "";
    String realname = "";
    String pswd = "";
    String sex = "";
    if(session != null){
        name = (String) session.getAttribute("uname");
        pswd = (String) session.getAttribute("pswd");
        realname = (String) session.getAttribute("realname");
        sex = (String) session.getAttribute("sex");
      //  if(uname != null && !uname.equals("") && pword != null && !pword.equals("")){
            out.println("Input UserName: <font color='red'><b>"+ name +"</b></font><br>"); 
            out.println("Input PassWord: <font color='red'><b>"+ pswd +"</b></font><br>");
            out.println("Input realname: <font color='red'><b>"+ realname +"</b></font><br>");
            out.println("Input sex: <font color='red'><b>"+ sex +"</b></font>");   
        
    } 
%>
  </body>
</html>

服务端登录注册页面：

mysql数据库：

实验结果截图：

      

转载请注明出处：https://home.cnblogs.com/u/mmmmm/

本代码实现安卓端注册登录用户名密码到mysql数据库，服务端通过jsp页面也能实现网页登录注册，如果出现乱码才采用GBK编码格式不懂私信我哦！