新web系统

11.26

今天开始新的web系统的练习，这个web系统真的很普通，只有一个变量，没有遇道什么问题，明天计划继续写web系统 

代码部分：

package bean;

public class TestBean {
public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String name;

}

package util;
import java.sql.*;
public class DBUtil {
public static final String connectionURL="jdbc:mysql://localhost:3306/user?useUnicode=true&characterEncoding=GB18030&useSSL=false&serverTimezone=GMT&allowPublicKeyRetrieval=true";
public static final String username="root";
public static final String psw="123456";
static Connection connection;
static ResultSet rSet;
static PreparedStatement sql;
public static Connection getConnection()
{
try {
Class.forName("com.mysql.jdbc.Driver");
System.out.println("数据库连接成功");
return DriverManager.getConnection(connectionURL, username, psw);
} catch (Exception e) {
// TODO: handle exception
System.out.println("数据库连接失败");
e.printStackTrace();
}
return null;
}

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();
}
}
}

}

package dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;

import bean.TestBean;
import util.DBUtil;

public class AddDao {

public static boolean add(TestBean test) {

boolean flag=false;
Connection conn=(Connection)DBUtil.getConnection();

try {
String sql="insert into test1205(name)"
+" values('"+test.getName()+"')";
PreparedStatement pstmt = conn.prepareStatement(sql);
int i = pstmt.executeUpdate();
pstmt.close();
conn.close();
if(i>0) {
flag = true;
}
}catch(SQLException e) {
e.printStackTrace();
}
return flag;
}

}

package 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 bean.TestBean;
import dao.AddDao;

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

public AddServlet() {
super();
// TODO Auto-generated constructor stub
}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String name = request.getParameter("name");
TestBean test = new TestBean();
test.setName(name);
try{
AddDao.add(test);
request.setAttribute("message", "注册成功");
//System.out.println("添加成功!");
request.getRequestDispatcher("index.html").forward(request,response);
}catch(Exception e){
System.out.println("添加失败");
e.printStackTrace();
}
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}