如何开发简单的javaweb项目，jsp+javabean+servlet

一、相关的软件下载和环境配置

1、下载并配置JDK。

2、下载eclipse。

3、下载并配置apache-tomcat（服务器）。

4、下载MySQL（数据库）。

5、下载Navicat for MySQL（数据库可视化工具），方便对数据库的操作。

6、下载jdbc用来实现eclipse中的项目与数据库实现连接。

---以上可在网上查询教程

二、新建web项目

然后点击next，

继续点next

勾选Generate web.xml

然后finish

2.新建两个包

然后User就是我们封装的数据

package com.better.bean;

public class User {

private int userid;

private String username;

private String password;

public User() {

}

public int getUserid() {

    return userid;

}

public void setUserid(int userid) {

    this.userid = userid;

}

public String getUsername() {

    return username;

}

public void setUsername(String username) {

    this.username = username;

}

public String getPassword() {

    return password;

}

public void setPassword(String password) {

    this.password = password;

}

}

建立类文件时一样

而servlet建立时不一样，如下

然后servlet代码如下

addservlet.java

package com.better.servlet;

import java.io.IOException;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.SQLException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 * Servlet implementation class addservlet

 */

@WebServlet("/addservlet")

public class addservlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**

     * @see HttpServlet#HttpServlet()

     */

    public addservlet() {

        super();

        // TODO Auto-generated constructor stub

    }

    /**

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse

     *      response)

     */

    protected void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        // TODO Auto-generated method stub

        request.setCharacterEncoding("UTF-8");

        response.setContentType("text/html;charset=UTF-8");

        String username = request.getParameter("username");

        String psword = request.getParameter("password");

        String url = "jdbc:mysql://localhost:3306/demodb?&useSSL=false&serverTimezone=UTC";

        String user = "root";

        String password = "9527";

        Connection conn = null;

        PreparedStatement ps = null;

        try {

            Class.forName("com.mysql.cj.jdbc.Driver");

            conn = DriverManager.getConnection(url, user, password);

        } catch (ClassNotFoundException e) {

            response.getWriter().print("加载驱动失败");

        } catch (SQLException e) {

            response.getWriter().print("连接数据库失败");

        }

        try {

            String sql = "INSERT INTO user(username,password) VALUES (?,?)";

            ps = conn.prepareStatement(sql);

            ps.setString(1, username);

            ps.setString(2, psword);

            int row = ps.executeUpdate();

            // 判断是否更新成功

            if (row > 0)

                // 更新成输出信息

                response.getWriter().print("成功添加了 " + row + "条数据！");

        } catch (SQLException e) {

            response.getWriter().print("注册用户信息失败");

        }

        try {

            if (ps != null) {

                ps.close();

                ps = null;

            }

            if (conn != null) {

                conn.close();

                conn = null;

            }

        } catch (Exception e) {

            response.getWriter().print("数据库关闭异常");

        }

        response.sendRedirect("main.jsp");

    }

    /**

     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse

     *      response)

     */

    protected void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        // TODO Auto-generated method stub

        doGet(request, response);

    }

}

然后你要配置web.xml文件

点开它

<servlet>

    <description></description>

    <display-name>addservlet</display-name>

    <servlet-name>addservlet</servlet-name>

    <servlet-class>com.better.servlet.addservlet</servlet-class>

  </servlet>

  <servlet-mapping>

    <servlet-name>addservlet</servlet-name>

    <url-pattern>/com.better.servlet/addservlet</url-pattern>

  </servlet-mapping>

把这段代码插进去

然后就可以使用这个servlet了

接着是deleteservlet.java、searchservlet.java、updateservlet.java、checkservlet.java

package com.better.servlet;

import java.io.IOException;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.SQLException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 * Servlet implementation class updateservlet

 */

@WebServlet("/updateservlet")

public class updateservlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**

     * @see HttpServlet#HttpServlet()

     */

    public updateservlet() {

        super();

        // TODO Auto-generated constructor stub

    }

    /**

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

     */

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

        // TODO Auto-generated method stub

        request.setCharacterEncoding("UTF-8");

        response.setContentType("text/html;charset=UTF-8");

        String username = request.getParameter("username");

        String psword = request.getParameter("password");

        String url = "jdbc:mysql://localhost:3306/demodb?&useSSL=false&serverTimezone=UTC";

        String user = "root";

        String password = "9527";

        Connection conn = null;

        PreparedStatement ps = null;

        try {

            Class.forName("com.mysql.cj.jdbc.Driver");

            conn = DriverManager.getConnection(url, user, password);

        } catch (ClassNotFoundException e) {

            response.getWriter().print("加载驱动失败");

        } catch (SQLException e) {

            response.getWriter().print("连接数据库失败");

        }

        try {

            String sql = "UPDATE user SET password=? WHERE username = ? ";

            ps=conn.prepareStatement(sql);

            ps.setString(1, psword);

            ps.setString(2, username);

            int row = ps.executeUpdate();

            // 判断是否更新成功

            if (row > 0)

                // 更新成输出信息

                response.getWriter().print("成功修改了 " + row + "条数据！");

        } catch (SQLException e) {

            response.getWriter().print("修改密码失败");

        }

        try {

            if (ps != null) {

                ps.close();

                ps = null;

            }

            if (conn != null) {

                conn.close();

                conn = null;

            }

        } catch (Exception e) {

            response.getWriter().print("数据库关闭异常");

        }

        response.sendRedirect("main.jsp");

    }

    /**

     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

     */

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

        // TODO Auto-generated method stub

        doGet(request, response);

    }

}

package com.better.servlet;

import java.io.IOException;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 * Servlet implementation class checkservlet

 */

@WebServlet("/checkservlet")

public class checkservlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**

     * @see HttpServlet#HttpServlet()

     */

    public checkservlet() {

        super();

        // TODO Auto-generated constructor stub

    }

    /**

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

     */

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

        // TODO Auto-generated method stub

        request.setCharacterEncoding("UTF-8");

        response.setContentType("text/html;charset=UTF-8");

        String adminname = request.getParameter("adminname");

        String adminword = request.getParameter("adminword");

        String url = "jdbc:mysql://localhost:3306/demodb?&useSSL=false&serverTimezone=UTC";

        String user = "root";

        String password = "9527";

        Connection conn = null;

        PreparedStatement ps = null;

        ResultSet rs=null;

        try {

            Class.forName("com.mysql.cj.jdbc.Driver");

            conn = DriverManager.getConnection(url, user, password);

        } catch (ClassNotFoundException e) {

            response.getWriter().print("加载驱动失败");

        } catch (SQLException e) {

            response.getWriter().print("连接数据库失败");

        }

        try{

            String sql="SELECT * FROM admin WHERE adminname = ? and adminword=? ";

            ps=conn.prepareStatement(sql);

            ps.setString(1, adminname);

            ps.setString(2, adminword);

            rs=ps.executeQuery();     //将sql语句传至数据库，返回的值为一个字符集用一个变量接收

            if(rs.next()){    //next（）获取里面的内容

                request.getRequestDispatcher("main.jsp")

                .forward(request, response);

            }

            else request.getRequestDispatcher("login.jsp")

            .forward(request, response);

        }catch(SQLException e){

            response.getWriter().print("数据库操作异常");

        }

        try{

            if(rs!=null){

                rs.close();

                rs=null;

            }

            if(ps!=null){

                ps.close();

                ps=null;

            }

            if(conn!=null){

                conn.close();

                conn=null;

            }

        }catch(Exception e){

            response.getWriter().println("数据库关闭异常");

        }

        response.getWriter().append("Served at: ").append(request.getContextPath());

    }

    /**

     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

     */

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

        // TODO Auto-generated method stub

        doGet(request, response);

    }

}

package com.better.servlet;

import java.io.IOException;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.SQLException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 * Servlet implementation class deleteservlet

 */

@WebServlet("/deleteservlet")

public class deleteservlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**

     * @see HttpServlet#HttpServlet()

     */

    public deleteservlet() {

        super();

        // TODO Auto-generated constructor stub

    }

    /**

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

     */

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

        // TODO Auto-generated method stub

        request.setCharacterEncoding("UTF-8");

        response.setContentType("text/html;charset=UTF-8");

        String username = request.getParameter("username");

        String url = "jdbc:mysql://localhost:3306/demodb?&useSSL=false&serverTimezone=UTC";

        String user = "root";

        String password = "9527";

        Connection conn = null;

        PreparedStatement ps = null;

        try {

            Class.forName("com.mysql.cj.jdbc.Driver");

            conn = DriverManager.getConnection(url, user, password);

        } catch (ClassNotFoundException e) {

            response.getWriter().print("加载驱动失败");

        } catch (SQLException e) {

            response.getWriter().print("连接数据库失败");

        }

        try {

            String sql = "DELETE FROM user WHERE username=?";

            ps=conn.prepareStatement(sql);

            ps.setString(1, username);

            int row = ps.executeUpdate();

            // 判断是否更新成功

            if (row > 0)

                // 更新成输出信息

                response.getWriter().print("成功删除了 " + row + "条数据！");

        } catch (SQLException e) {

            response.getWriter().print("删除用户失败");

        }

        try {

            if (ps != null) {

                ps.close();

                ps = null;

            }

            if (conn != null) {

                conn.close();

                conn = null;

            }

        } catch (Exception e) {

            response.getWriter().print("数据库关闭异常");

        }

        //重定向到main页面

        response.sendRedirect("main.jsp");

    }

    /**

     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

     */

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

        // TODO Auto-generated method stub

        doGet(request, response);

    }

}

package com.better.servlet;

import java.io.IOException;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 * Servlet implementation class searchservlet

 */

@WebServlet("/searchservlet")

public class searchservlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**

     * @see HttpServlet#HttpServlet()

     */

    public searchservlet() {

        super();

        // TODO Auto-generated constructor stub

    }

    /**

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

     */

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

        // TODO Auto-generated method stub

        request.setCharacterEncoding("UTF-8");

        response.setContentType("text/html;charset=UTF-8");

        String username = request.getParameter("username");

        String url = "jdbc:mysql://localhost:3306/demodb?&useSSL=false&serverTimezone=UTC";

        String user = "root";

        String password = "9527";

        Connection conn = null;

        PreparedStatement ps = null;

        ResultSet rs=null;

        try {

            Class.forName("com.mysql.cj.jdbc.Driver");

            conn = DriverManager.getConnection(url, user, password);

        } catch (ClassNotFoundException e) {

            response.getWriter().print("加载驱动失败");

        } catch (SQLException e) {

            response.getWriter().print("连接数据库失败");

        }

        try{

            String sql="SELECT * FROM user WHERE username = ? ";

            ps=conn.prepareStatement(sql);

            ps.setString(1, username);

            rs=ps.executeQuery();     //将sql语句传至数据库，返回的值为一个字符集用一个变量接收

            while(rs.next()){    //next（）获取里面的内容

                response.getWriter().println(rs.getString(1)+" "+rs.getString(2)+" "+rs.getString(3));

                                 //getString（n）获取第n列的内容

                                    //数据库中的列数是从1开始的

            }

        }catch(SQLException e){

            response.getWriter().print("查询用户失败");

        }

        try{

            if(rs!=null){

                rs.close();

                rs=null;

            }

            if(ps!=null){

                ps.close();

                ps=null;

            }

            if(conn!=null){

                conn.close();

                conn=null;

            }

        }catch(Exception e){

            response.getWriter().println("数据库关闭异常");

        }

    }

    /**

     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

     */

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

        // TODO Auto-generated method stub

        doGet(request, response);

    }

}

然后是完整的web.xml文件配置

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" id="WebApp_ID" version="4.0">

  <display-name>Better</display-name>

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.jsp</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.htm</welcome-file>

    <welcome-file>default.jsp</welcome-file>

  </welcome-file-list>

  <servlet>

    <description></description>

    <display-name>addservlet</display-name>

    <servlet-name>addservlet</servlet-name>

    <servlet-class>com.better.servlet.addservlet</servlet-class>

  </servlet>

  <servlet-mapping>

    <servlet-name>addservlet</servlet-name>

    <url-pattern>/com.better.servlet/addservlet</url-pattern>

  </servlet-mapping>

  <servlet>

    <description></description>

    <display-name>updateservlet</display-name>

    <servlet-name>updateservlet</servlet-name>

    <servlet-class>com.better.servlet.updateservlet</servlet-class>

  </servlet>

  <servlet-mapping>

    <servlet-name>updateservlet</servlet-name>

    <url-pattern>/com.better.servlet/updateservlet</url-pattern>

  </servlet-mapping>

  <servlet>

    <description></description>

    <display-name>deleteservlet</display-name>

    <servlet-name>deleteservlet</servlet-name>

    <servlet-class>com.better.servlet.deleteservlet</servlet-class>

  </servlet>

  <servlet-mapping>

    <servlet-name>deleteservlet</servlet-name>

    <url-pattern>/com.better.servlet/deleteservlet</url-pattern>

  </servlet-mapping>

  <servlet>

    <description></description>

    <display-name>searchservlet</display-name>

    <servlet-name>searchservlet</servlet-name>

    <servlet-class>com.better.servlet.searchservlet</servlet-class>

  </servlet>

  <servlet-mapping>

    <servlet-name>searchservlet</servlet-name>

    <url-pattern>/com.better.servlet/searchservlet</url-pattern>

  </servlet-mapping>

  <servlet>

    <description></description>

    <display-name>checkservlet</display-name>

    <servlet-name>checkservlet</servlet-name>

    <servlet-class>com.better.servlet.checkservlet</servlet-class>

  </servlet>

  <servlet-mapping>

    <servlet-name>checkservlet</servlet-name>

    <url-pattern>/com.better.servlet/checkservlet</url-pattern>

  </servlet-mapping>

</web-app>

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>登录页面</title>

</head>

<body

    background="file:///D:/eclipse-workplace/Better/WebContent/image/星空.jpg">

    <form action="checkservlet" method=post>

        <center>

            <table>

                <tr>

                    <td><font color="white">输入管理员名：</font></td>

                    <td><INPUT type=txt name=adminname></td>

                </tr>

                <tr>

                    <td><font color="white">输入管理员密码：</font></td>

                    <td><INPUT type=password name=adminword></td>

                </tr>

                <tr colspan=2>

                    <td><INPUT type=submit value=登录></td>

                </tr>

            </table>

        </center>

    </form>

</body>

</html>

main.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>主界面</title>

</head>

<body>

<center><h1>主菜单</h1><center>

<table><center>

<h2 align="center">

  <a href="Add.jsp">添加用户</a>

</h2>

<h2 align="center">

  <a href="Delete.jsp">删除用户</a>

</h2>

<h2 align="center">

  <a href="Update.jsp">修改用户</a>

</h2>

<h2 align="center">

  <a href="Search.jsp">查询用户</a>

</h2>

</table></center>

</body>

</html>

Add.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>添加</title>

</head>

<script type="text/javascript">

         function check(form) {

              if(form.username.value=='') {

                    alert("请输入用户名!");

                    form.username.focus();

                    return false;

               }

               if(form.password.value==''){

                    alert("请输入登录密码!");

                    form.password.focus();

                    return false;

                 }

                 return true;

         }

</script>

<body>

<form action="addservlet" method="post">

    用户名:  <input type=text name="username" size="18" value="" ><br>

    登录密码:<input type="password" name="password" size="18" value=""/>

           <input type=submit name="submit1" value="注册" onclick="return check(this.form)">

</form>

</body>

</html>

Delete.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>删除</title>

</head>

<script type="text/javascript">

         function check(form) {

              if(form.username.value=='') {

                    alert("请输入用户名!");

                    form.username.focus();

                    return false;

               }

         }

</script>

<body>

<form action="deleteservlet" method="post">

    想删除的用户名:  <input type=text name="username" size="18" value="" ><br>

           <input type=submit name="submit1" value="删除" onclick="return check(this.form)">

</form>

</body>

</html>

Update.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>修改</title>

</head>

<script type="text/javascript">

         function check(form) {

              if(form.username.value=='') {

                    alert("请输入用户名!");

                    form.username.focus();

                    return false;

               }

               if(form.password.value==''){

                    alert("请输入新密码!");

                    form.password.focus();

                    return false;

                 }

                 return true;

         }

</script>

<body>

<form action="updateservlet" method="post">

    用户名:  <input type=text name="username" size="18" value="" ><br>

   新密码:<input type="password" name="password" size="18" value=""/>

           <input type=submit name="submit1" value="修改" onclick="return check(this.form)">

</form>

</body>

</html>

Search.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>查找</title>

</head>

<script type="text/javascript">

         function check(form) {

              if(form.username.value=='') {

                    alert("请输入用户名!");

                    form.username.focus();

                    return false;

               }

         }

</script>

<body>

<form action="searchservlet" method="post">

    想查找的用户名:  <input type=text name="username" size="18" value="" ><br>

           <input type=submit name="submit1" value="查找" onclick="return check(this.form)">

</form>

</body>

</html>

再就是建一个数据库两张表

User这张表

再就是管理员这张表

admin

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