简单servlet和jdbc回顾

主要写的是doPost方法的
类Servlet.java

package com.sinsoft.service;

import java.io.IOException;
import java.io.Writer;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.Statement;

/**
 * @auther madong
 * @date 2019/5/6-15:28
 */
@javax.servlet.annotation.WebServlet(name = "servlet")
public class Servlet extends javax.servlet.http.HttpServlet {
    private Connection conn = null;

    protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
        // TODO Auto-generated method stub
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        Writer out = response.getWriter();
        //向服务器发送请求获取到参数
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        String password2 = request.getParameter("password2");
        String email = request.getParameter("email");
        String age = request.getParameter("age");
        if (password.equals(password2)) {
            try {
                Class.forName("com.mysql.jdbc.Driver");
                String url = "jdbc:mysql://localhost:3306/test";
                conn = DriverManager.getConnection(url, "root", "000000");
                String sql = "INSERT INTO tr_user (username,password,email,age) VALUES (?,?,?,?)";
                Statement stmt = conn.createStatement();
                PreparedStatement pstmt = conn.prepareStatement(sql);
                pstmt.setString(1, username);
                pstmt.setString(2, password);
                pstmt.setString(3, email);
                pstmt.setString(4, age);
                pstmt.executeUpdate();
                pstmt.close();
                conn.close();
                response.setHeader("Content-Type", "text/html; charset=UTF-8");
                out.write("用户名：" + username);
                out.write("密码：" + password);
                out.flush();
                out.close();
            } catch (Exception e) {
                System.out.println("数据库连接失败！");
                e.printStackTrace();
            }
        }else {
            response.setHeader("Content-Type", "text/html; charset=UTF-8");
            out.write("两次输入的密码不一致");
        }



    }

    protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
    }
}

页面index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  <title>登录</title>
</head>
<body>
<h3>登录</h3>
<hr>
<form action="servlet" method="post">
  用户名：&nbsp;<input type="text" name="username"/><br>
  密码:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input type="text" name="password"/><br>
  确认密码:<input type="text" name="password2"/><br>
  邮箱:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input type="text" name="email"/><br>
  年龄:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input type="text" name="age"/><br>
  <input type="submit" />
</form>

</body>

</html>

web.xml文件配置

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >


<web-app>


  <servlet>
    <servlet-name>Servlet</servlet-name>
    <servlet-class>com.sinsoft.service.Servlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>Servlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

简单servlet和jdbc回顾

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