java连接MySQL增加信息

package com.dao;//导入信息

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import com.entry.user;
import com.util.DBUtil;

public class userDao {
public boolean add(user user) {
String sql = "insert into user2(id,password,sex,name,no,mail,xy,x,bj,nf,syd,bz) "
+ "values('" + user.getId() + "','" + user.getPassword() + "','" + user.getSex() + "','" + user.getName() + "','" + user.getNo() + "','" + user.getMail() + "','" + user.getXy() + "','" + user.getX() + "','" + user.getBj() + "','" + user.getNf() + "','" + user.getSyd() + "','" + user.getBz() + "')";
Connection conn = DBUtil.getConn();
Statement state = null;
boolean f = false;
int a = 0;

try {
state = conn.createStatement();
state.executeUpdate(sql);
} catch (Exception e) {
e.printStackTrace();
} finally {
DBUtil.close(state, conn);
}

if (a > 0) {
f = true;
}
return f;
}
public boolean id(String id) {
boolean f = false;
String sql = "select id from user2 where name = '" + id + "'";
Connection conn = DBUtil.getConn();
Statement state = null;
ResultSet rs = null;
try {
state = conn.createStatement();
rs = state.executeQuery(sql);
while (rs.next()) {
f = true;
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(rs, state, conn);
}
return f;
}
}

输入要的信息变量

package com.entry;

public class user {
private String id;
private String name;
private String password;
private String no;
private String mail;
private String xy;
private String sex;
private String x;
private String bj;
private String nf;
private String syd;
private String bz;

public String getId() {
return id;
}
public String getX() {
return x;
}
public void setX(String x) {
this.x = x;
}
public String getBj() {
return bj;
}
public void setBj(String bj) {
this.bj = bj;
}
public String getNf() {
return nf;
}
public void setNf(String nf) {
this.nf = nf;
}
public String getSyd() {
return syd;
}
public void setSyd(String syd) {
this.syd = syd;
}
public String getBz() {
return bz;
}
public void setBz(String bz) {
this.bz = bz;
}
public void setId(String id) {
this.id = id;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getNo() {
return no;
}
public void setNo(String no) {
this.no = no;
}
public String getMail() {
return mail;
}
public void setMail(String mail) {
this.mail = mail;
}
public user(){}
public user(String name, String password) {
this.name = name;
this.password = password;
};

public user(String id, String name, String password, String no, String mail, String xy, String sex, String x, String bj,
String nf, String syd, String bz) {
super();
this.id = id;
this.name = name;
this.password = password;
this.no = no;
this.mail = mail;
this.xy = xy;
this.sex = sex;
this.x = x;
this.bj = bj;
this.nf = nf;
this.syd = syd;
this.bz = bz;
}
public String getXy() {
return xy;
}
public void setXy(String xy) {
this.xy = xy;
}
}

检测是否导入

package com.service;

import com.dao.userDao;
import com.entry.user;

public class userservice {
userDao cDao = new userDao();


public boolean add(user user) {
boolean f = false;
if(!cDao.id(user.getId())) {
cDao.add(user);
f = true;
}
return f;
}
}

package com.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.entry.user;
import com.service.userservice;

@WebServlet("/AddServlet")
public class AddServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

userservice service = new userservice();
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
String method = req.getParameter("method");
if("add".equals(method))
doGet(req,resp);

}


protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String id = request.getParameter("id");
String password = request.getParameter("password");
String sex = request.getParameter("sex");
String name = request.getParameter("name");
String no = request.getParameter("no");
String mail = request.getParameter("mail");
String xy = request.getParameter("xy");
String x = request.getParameter("x");
String bj = request.getParameter("bj");
String nf = request.getParameter("nf");
String syd = request.getParameter("syd");
String bz = request.getParameter("bz");
user user= new user(id, name, password, no, mail, xy, sex, x, bj,
nf, syd, bz);
System.out.println(id);
if(service.add(user)) {
request.setAttribute("message");
request.getRequestDispatcher("NewFile.jsp").forward(request,response);
} else {
request.setAttribute("message");
request.getRequestDispatcher("NewFile.jsp").forward(request,response);
}
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

doGet(request, response);
}

}

连接数据库

package com.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class DBUtil {

public static String db_url = "jdbc:mysql://localhost:3306/test?useSSL=false&useUnicode=true&characterEncoding=UTF-8";
public static String db_user = "root";
public static String db_pass = "root";

public static Connection getConn () {
Connection conn = null;

try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(db_url, db_user, db_pass);
} catch (Exception e) {
e.printStackTrace();
}

return conn;
}
public static void close (Statement state, Connection conn) {
if (state != null) {
try {
state.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

public static void close (ResultSet rs, Statement state, Connection conn) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

if (state != null) {
try {
state.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

public static void main(String[] args) throws SQLException {
Connection conn = getConn();
PreparedStatement pstmt = null;
ResultSet rs = null;
String sql ="select * from user";
pstmt = conn.prepareStatement(sql);
rs = pstmt.executeQuery();
if(rs.next()){
System.out.println("添加成功");
}else{
System.out.println("添加失败");
}
}
}

做注册界面

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<title>Insert title here</title>
<meta charset="UTF-8">
<title>注册页面</title>
</head>
<body>
<%
Object message = request.getAttribute("message");
if(message!=null && !"".equals(message)){

%>
<script type="text/javascript">
alert("<%=request.getAttribute("message")%>");
</script>
<%} %>
<div align="center">
<h6 style="color: black;">注册</h6>

<form name = "form1" action="AddServlet?method=add" method="post" onsubmit="return check_submit()">
<table>
<tr>
<td>登录账号</td>
<td colspan="2"> <input type="text" id="id" name="id" maxlength="12" onblur="blur_id()" onfocus="focus_id()"/></td>
<td width="300"><div id="result"></td>
</tr>
<tr>
<td>登录密码</td>
<td colspan="2"> <input type="password" id="password" name="password" onblur="blur_pass()" onfocus="focus_pass()" /></td>
<td width="300"><div id="result1"></td>
</tr>
<tr>
<td>性别：</td>
<td colspan="2">
<select name="sex"id="sex" >
<option value="男" >男</option>
<option value="女" >女</option>
</select></td>
</tr>
<tr>
<td>姓名</td>
<td colspan="2"><input type="text" id="name" name="name" /></td>
</tr>
<tr>
<td>学号</td>
<td colspan="2"><input style="ime-mode:Disabled" maxlength="8" type="text" id="no" name="no" onblur="blur_phone()" onfocus="focus_phone()"/></td>
<td width="300"><div id="result_name"></td>
</tr><tr>
<td>电子邮件</td>
<td colspan="2"><input type="email" id="mail" name="mail" ></td>
</tr>
<tr>
<td>所在学院</td>
<td colspan="2"><input type="text" id="xy" name="xy" ></td>
</tr>
<tr>
<td>所在系</td>
<td colspan="2"><input type="text" id="x" name="x" ></td>
</tr>
<tr>
<td>所在班级</td>
<td colspan="2"><input type="text" id="bj" name="bj" ></td>
</tr>
<tr>
<td>入学年份（届）：</td>
<td colspan="2">
<select name="nf"id="nf" >
<option value="2017" >2017</option>
<option value="2018" >2018</option>
</select></td>
</tr>
<tr>
<td>生源地：</td>
<td colspan="2"><input type="text" id="syd" name="syd" ></td>
</tr>
<tr>
<td>备注：</td>
<td colspan="2"><input type="text" id="bz" name="bz" ></td>
</tr>

<tr>
<td colspan="3"> <button type="submit" class="b">保&nbsp;&nbsp;&nbsp;存</button>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<button type="reset" class="b">重&nbsp;&nbsp;&nbsp;置</button></td>

</tr>
</table>
</form>
</div>
<script type="text/javascript">
/*
表单验证
*/
var flag = false; // flag 如果为true（即用户名合法）就允许表单提交， 如果为false（即用户名不合法）阻止提交
function focus_pass()
{
var nameObj = document.getElementById("result1");
nameObj.innerHTML = "由八位以上字符和数字组成";
nameObj.style.color="#999";
}
function blur_pass()
{
var nameObj = document.getElementById("result1");
// 判断用户名是否合法
var str2 = check_user_pass(document.form1.password.value);
nameObj.style.color="red";
if ("密码合法" == str2)
{
flag = true;
nameObj.innerHTML = str2;
}
else
{
nameObj.innerHTML = str2;
}
}

function check_user_pass(str)
{ var str2 = "密码合法";
if ("" == str)
{
str2 = "密码为空";
return str2;
}
else if (str.length<8)
{
str2 = "密码应为8位组成";
return str2;
}
else if (!check_word(str))
{
str2 = "未含有英文字符";
return str2;
}

return str2;
}

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