jsp第10个作业

package Servlet;

import JDBC.JDBC;

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 javax.swing.*;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;

@WebServlet(name = "LoginServlet")
public class RegisterServlet extends HttpServlet {
    public RegisterServlet() {
        super();
    }

    @Override
    public void destroy() {
        super.destroy();
    }
    public void wrong1() {
        String msg = "注册成功！";
        int type = JOptionPane.YES_NO_OPTION;
        String title = "信息提示";
        JOptionPane.showMessageDialog(null, msg, title, type);
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        JDBC jdbc = new JDBC();
        Connection con = null;
        PreparedStatement ps = null;
        String username=new String(request.getParameter("username").getBytes("ISO-8859-1"),"UTF-8");
        String PASSWORD=new String(request.getParameter("userpassword").getBytes("ISO-8859-1"),"UTF-8");
        String email=new String(request.getParameter("Email").getBytes("ISO-8859-1"),"UTF-8");
        try {
            con = jdbc.getConnection();
            String sql = "insert into Usersd(username,PASSWORD,email) values (?,?,?)";
            ps = con.prepareStatement(sql);
            ps.setString(1, username);
            ps.setString(2,PASSWORD);
            ps.setString(3, email);
            int row = ps.executeUpdate();
            wrong1();
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            jdbc.closeAll(con,ps,null);
        }
    }

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

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
  <display-name></display-name>    
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
      <servlet-mapping>
        <servlet-name>RegisterServlet</servlet-name>
        <url-pattern>/RegisterServlet</url-pattern>
    </servlet-mapping>
    <servlet>
        <servlet-name>RegisterServlet</servlet-name>
        <servlet-class>Servlet.RegisterServlet</servlet-class>
    </servlet>
</web-app>

package JDBC;

import java.sql.*;

public class JDBC {
    //获取连接
    public Connection getConnection() {
        Connection conn = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            // 建立连接
            conn = DriverManager.getConnection(
                    "jdbc:mysql://localhost:3306/mysql", "root", "root");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return conn;
    }

    public void closeAll(Connection con, PreparedStatement ps, ResultSet rs) {

        //关闭资源,释放资源
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) { 
                rs = null;
            }
        }
        if (ps != null) {
            try {
                ps.close();
            } catch (SQLException e) { 
                ps = null;
            }
        }
        if (con != null) {
            try {
                con.close();
            } catch (SQLException e) { 
                rs = null;
            }
        }
    }
}