Java web--MVC開發模式介紹

在開發web應用程序時，通常需要同時使用3種技術，並分別承擔不同的職責。jsp一般來編寫用戶界面層的信息顯示，充當視圖層的角色（簡稱：V）；servlet需要來扮演任務的執行者，一般充當控制層的角色（簡稱：C）；Javabean主要實現業務邏輯的處理，充當模型層的角色（簡稱：M）。這些分工就如同流水線一般，不同的人有不同的任務，承擔不同的責任。通過這三種技術的組合實現不同組件功能分工協作，將一個系統的功能分爲3種不同類型的組件，這種技術通常稱爲MVC模式。

一、jsp技術

jsp是一種運行在服務器端的腳本語言，它是用來開發動態網頁的技術，是Java web程序開發的重要技術。與jsp相反的就是HTML，它是一種靜態網絡開發技術。

如果你已經知道了MVC開發模式，想來你應該也已經知道了jsp技術。

如果你不知道的話，那麼你可以到菜鳥教程網站或者w3school網站去學習，通過百度就可以查到，這些網站講的都比較好。

二、Javabean技術

Javaweb是用Java語言編寫的、遵循一定標準的類，他封裝了數據和業務邏輯，完成數據封裝和數據處理等功能。

詳情可見：

java web--javabean技術：https://blog.csdn.net/qq_43238335/article/details/105701359

三、servlet技術

Servlet技術是一種Java語言編寫的服務器端程序，是由服務器端調用和執行的、按照servlet自身規範編寫的Java。servlet可以處理客戶端傳來的http請求，並返回一個響應。

詳情可見：

java web--Servlet技術（一）：https://blog.csdn.net/qq_43238335/article/details/105964695

java web--Servlet技術（二）：https://blog.csdn.net/qq_43238335/article/details/106138427

四、簡單的MVC開發模式介紹

輸入圓的半徑，求得圓的周長和麪積

簡單的分爲四個部分：兩個jsp文件、一個Javabean文件、一個servlet文件。

jsp完成數據的獲取和顯示，Javabean完成業務邏輯的處理，servlet完成具體的功能。

1.jsp獲取數據

<%@ 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>提交頁面</title>
</head>
<body>
<p>請輸入圓的半徑</p>
<hr>
<form action="../a02b" method="post">
<table>
<tr><td>圓的半徑：</td><td><input name="radius"></td></tr>
<tr><td><input type="submit" value="確認"></td><td><input type="reset" value="取消"></td></tr>
</table>
</form>
</body>
</html>

2.javabean業務邏輯

package aaa;

public class a02a {
private double radius;

public a02a() {
	super();
	// TODO Auto-generated constructor stub
}

public a02a(double radius) {
	super();
	this.radius = radius;
}

public double getRadius() {
	return radius;
}

public void setRadius(double radius) {
	this.radius = radius;
}
public double mj()
{
	return Math.PI*radius*radius;
}
public double zc()
{
	return Math.PI*2*radius;
}
}

3.servlet 具體的完成功能，計算出圓的周長和麪積

package aaa;

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;

/**
 * Servlet implementation class a02b
 */
@WebServlet("/a02b")
public class a02b extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public a02b() {
        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
		doPost(request,response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		String number=request.getParameter("radius");
		double r=Double.parseDouble(number);
		a02a aa=new a02a(r);
		double mj=aa.mj();
		double zc=aa.zc();
		request.setAttribute("mj", mj);
		request.setAttribute("zc", zc);
		request.getRequestDispatcher("/a02/a02d.jsp").forward(request, response);
	}

}

4.jsp數據顯示

<%@ 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>輸出頁面</title>
</head>
<body>
<%
out.println("面積爲  "+request.getAttribute("mj"));
out.println("<br>");
out.println("周長爲  "+request.getAttribute("zc"));
%>
</body>
</html>

五、基於MVC技術+Dao技術的學生信息管理系統的設計（Dao技術是一種數據庫連接技術）

我通過Dao技術連接的是MySQL的數據庫。

以下是管理系統的流程和結構（僅爲查詢模塊，其餘模塊與查詢模塊相同）

1.javabean部分

//User.java文件

package bean1;

public class User {
	private int id;
	private String name;
	private String sex;
	private int age;
	private double weight;
	private double height;
	public User() {
		super();
		// TODO Auto-generated constructor stub
	}
	public User(int id, String name, String sex, int age, double weight, double height) {
		super();
		this.id = id;
		this.name = name;
		this.sex = sex;
		this.age = age;
		this.weight = weight;
		this.height = height;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	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 int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public double getWeight() {
		return weight;
	}
	public void setWeight(double weight) {
		this.weight = weight;
	}
	public double getHeight() {
		return height;
	}
	public void setHeight(double height) {
		this.height = height;
	}
}

2.Dao部分

//db.properties文件
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/aaa?useUnicode=true&characterEncoding=UTF-8
user=root
password=2411030483


//JdbcUtil.java文件
package bean1;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

public class JdbcUtil {
	private static String driver;
	private static String url;
	private static String user;
	private static String password;
	private static Properties pr=new Properties();
	public JdbcUtil(){
		super();
	}
	static 
	{
		try {
			pr.load(JdbcUtil.class.getClassLoader().getResourceAsStream("db.properties"));
		    driver=pr.getProperty("driver");
		    url=pr.getProperty("url");
		    user=pr.getProperty("user");
		    password=pr.getProperty("password");
		    try {
				Class.forName(driver);
			} catch (ClassNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	public static Connection getConnection() throws SQLException
	{
		return DriverManager.getConnection(url,user,password);
	}
	public static void free(Connection conn,Statement st,ResultSet rs) throws Exception
	{
		if(conn!=null){conn.close();}
		if(st!=null){st.close();}
		if(rs!=null){rs.close();}
	}
}

//UserDao.java文件
package bean1;

import com.mysql.jdbc.Connection;
import com.mysql.jdbc.PreparedStatement;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;

public class UserDao {
public int add(User user)throws Exception
{
	Connection conn=(Connection) JdbcUtil.getConnection();
	String sql="insert into biao1(id,name,sex,age,weight,height) values(?,?,?,?,?,?);";
	PreparedStatement pstmt=(PreparedStatement) conn.prepareStatement(sql);
	pstmt.setInt(1,user.getId());//將第一個佔位符賦值
	pstmt.setString(2,user.getName());
	pstmt.setString(3,user.getSex());
	pstmt.setInt(4,user.getAge());
	pstmt.setDouble(5,user.getWeight());
	pstmt.setDouble(6,user.getHeight());
	int n=pstmt.executeUpdate();
	JdbcUtil.free(conn,pstmt,null);
	return n;
}
public int update(User user)throws Exception
{
	Connection conn=(Connection) JdbcUtil.getConnection();
	String sql="update biao1 set id=?,name=?,sex=?,age=?,weight=?,height=? where name=? and sex=?"; 
	PreparedStatement pstmt=(PreparedStatement) conn.prepareStatement(sql);
	pstmt.setInt(1,user.getId());//將第一個佔位符賦值
	pstmt.setString(2,user.getName());
	pstmt.setString(3,user.getSex());
	pstmt.setInt(4,user.getAge());
	pstmt.setDouble(5,user.getWeight());
	pstmt.setDouble(6,user.getHeight());
	pstmt.setString(7,user.getName());
	pstmt.setString(8,user.getSex());
	int n=pstmt.executeUpdate();
	JdbcUtil.free(conn,pstmt,null);
	return n;
}
public int delete(String name,String sex,double weight1,double weight2)throws Exception
{
	Connection conn=(Connection) JdbcUtil.getConnection();
	String sql="delete from biao1 where name=?,sex=?,weight>=? and weight<=?;";
	PreparedStatement pstmt=(PreparedStatement) conn.prepareStatement(sql);
	pstmt.setString(1,name);
	pstmt.setString(2,sex);
	pstmt.setDouble(3,weight1);
	pstmt.setDouble(4,weight2);
	int n=pstmt.executeUpdate();
	JdbcUtil.free(conn,pstmt,null);
	return n;
}
public List<User> findUserById(double weight1,double weight2)throws Exception
{
	Connection conn=(Connection) JdbcUtil.getConnection();
	User user=null;
	List<User> userList=new ArrayList<User>();
	String sql = "select id,name,sex,age,weight,height from biao1 where weight>=? and weight<=?;";//寫出對數據庫的操作語句，？表示佔位符
	PreparedStatement pstmt=(PreparedStatement) conn.prepareStatement(sql);
	pstmt.setDouble(1,weight1);
	pstmt.setDouble(2,weight2);
	ResultSet rs=pstmt.executeQuery();
	while(rs.next())
	{
		user=new User();
		user.setId(rs.getInt("id"));
		user.setName(rs.getString("name"));
		user.setSex(rs.getString("sex"));
		user.setAge(rs.getInt("age"));
		user.setWeight(rs.getDouble("weight"));
		user.setHeight(rs.getDouble("height"));
		userList.add(user);
	}
	JdbcUtil.free(conn,pstmt,rs);
	return userList;
}
public List<User> QueryAll() throws Exception
{
	Connection conn=(Connection) JdbcUtil.getConnection();
	User user=null;
	List<User> userList=new ArrayList<User>();
	String sql="select * from biao1";
	PreparedStatement pstmt=(PreparedStatement) conn.prepareStatement(sql);
	ResultSet rs=pstmt.executeQuery();
	while(rs.next())
	{
		user=new User();
		user.setId(rs.getInt("id"));
		user.setName(rs.getString("name"));
		user.setSex(rs.getString("sex"));
		user.setAge(rs.getInt("age"));
		user.setWeight(rs.getDouble("weight"));
		user.setHeight(rs.getDouble("height"));
		userList.add(user);
	}
	JdbcUtil.free(conn,pstmt,rs);
	return userList;
}
}

3.servlet部分

//a01a_delete2.java文件
package bean1;

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;

/**
 * Servlet implementation class a01a_delete2
 */
@WebServlet("/a01a_delete2")
public class a01a_delete2 extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public a01a_delete2() {
        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
		doPost(request, response);
		}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding("UTF-8");
		String name=request.getParameter("name");
		String sex=request.getParameter("sex");
		String ww1=request.getParameter("w1");
		String ww2=request.getParameter("w2");
		double weight1=Double.parseDouble(ww1);
		double weight2=Double.parseDouble(ww2);
		UserDao dao=new UserDao();
		try {
			int n=dao.delete(name, sex, weight1, weight2);
			request.setAttribute("number", n);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		request.getRequestDispatcher("/a01a_delete/a01a_delete3.jsp").forward(request,response);
		}
}


//a01a_insert2.jsp文件
package bean1;

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;

/**
 * Servlet implementation class a01a_insert2
 */
@WebServlet("/a01a_insert2")
public class a01a_insert2 extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public a01a_insert2() {
        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
		doPost(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding("UTF-8");
		String id=request.getParameter("id_in");
		String name=request.getParameter("name_in");
		String sex=request.getParameter("sex_in");
		String age=request.getParameter("age_in");
		String weight=request.getParameter("weight_in");
		String height=request.getParameter("height_in");//通過表單獲取數據
		int id2=Integer.parseInt(id);//將數據轉換爲相應類型
		int age2=Integer.parseInt(age);
		double weight2=Double.parseDouble(weight);
		double height2=Double.parseDouble(height);
		User user=new User(id2,name,sex,age2,weight2,height2);
		UserDao dao=new UserDao();
		try {
			int n=dao.add(user);
			request.setAttribute("number", n);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		request.getRequestDispatcher("/a01a_insert/a01a_insert3.jsp").forward(request,response);
		}
}


//a01a_select2.java文件
package bean1;

import java.io.IOException;
import java.util.List;

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 a01a_select2
 */
@WebServlet("/a01a_select2")
public class a01a_select2 extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public a01a_select2() {
        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
		doPost(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding("UTF-8");
		String weight1 = request.getParameter("weight1");//通過表單獲取數據
		String weight2 = request.getParameter("weight2");
		double wt1 = Double.parseDouble(weight1);
		double wt2 = Double.parseDouble(weight2);//將數據轉換爲相應類型
		UserDao dao=new UserDao();
		try {
			List<User> user=dao.findUserById(wt1, wt2);
			request.setAttribute("list", user);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		request.getRequestDispatcher("/a01a_select/a01a_select3.jsp").forward(request,response);
		}
}


//a01a_update.java文件
package bean1;

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;

/**
 * Servlet implementation class a01a_update2
 */
@WebServlet("/a01a_update2")
public class a01a_update2 extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public a01a_update2() {
        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
		doPost(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding("UTF-8");
		int id2=Integer.parseInt(request.getParameter("id"));
		String name2=request.getParameter("name");
		String sex2=request.getParameter("sex");
		int age2=Integer.parseInt(request.getParameter("age"));
		double weight2=Double.parseDouble(request.getParameter("weight"));
		double height2=Double.parseDouble(request.getParameter("height"));
		UserDao dao=new UserDao();
		User user=new User(id2,name2,sex2,age2,weight2,height2);
		try {
			int n=dao.update(user);
			request.setAttribute("number", n);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		request.getRequestDispatcher("/a01a_update/a01a_update3.jsp").forward(request,response);
		}
}

4.jsp部分

<!-- a01a_delete1.jsp文件 -->
<%@ 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>刪除信息頁面</title>
</head>
<body>
<p>請寫入刪除信息</p>
<hr>
<form action="../a01a_delete2" method="post"><%//創建表單傳輸數據 %>
姓名：&nbsp;<input type="text" name="name"><br><br>
性別：
&nbsp;男<input type="radio" name="sex" value="男">
&nbsp;女<input type="radio" name="sex" value="女"><br><br>
體重範圍：<p>
最低體重：&nbsp;<input type="text" name="w1"><br><br>
最高體重：&nbsp;<input type="text" name="w2"><br><br>
<input type="submit" value="確認">
&nbsp;<input type="reset" value="取消">
</form><br>
</body>
</html>


<!-- a01a_delete3.jsp文件 -->
<%@ 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>刪除界面</title>
</head>
<body>
<p>刪除界面</p>
<hr>
<%
String a=request.getAttribute("number").toString();
int aa=Integer.parseInt(a);
if(aa>0) out.println("刪除成功");
else out.println("刪除失敗");
%> 
</body>
</html>


<!-- a01a_insert1.jsp文件 -->
<%@ 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>插入信息頁面</title>
</head>
<body>
<p>請寫入插入信息</p>
<hr>
<form action="../a01a_insert2" method="post"><%//創建表單傳輸數據 %>
序號：&nbsp;<input type="text" name="id_in"><br><br>
姓名：&nbsp;<input type="text" name="name_in"><br><br>
性別：&nbsp;<input type="text" name="sex_in"><br><br>
年齡：&nbsp;<input type="text" name="age_in"><br><br>
體重：&nbsp;<input type="text" name="weight_in"><br><br>
身高：&nbsp;<input type="text" name="height_in"><br><br>
<input type="submit" value="確認">
&nbsp;<input type="reset" value="取消">
</form><br>
</body>
</html>


<!-- a01a_insert3.jsp文件 -->
<%@ 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>插入界面</title>
</head>
<body>
<p>插入界面</p>
<hr>
<%
String a=request.getAttribute("number").toString();
int aa=Integer.parseInt(a);
if(aa>0) out.println("插入成功");
else out.println("插入失敗");
%> 
</body>
</html>



<!-- a01a_select1.jsp文件 -->
<%@ 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>查詢信息頁面</title>
</head>
<body>
<form action="../a01a_select2" method="post"><%//創建表單傳輸數據 %>
<p>請選擇想要查詢的分數範圍</p>
<hr>
最低體重：&nbsp;<input type="text" name="weight1"><br><br>
最高體重：&nbsp;<input type="text" name="weight2"><br><br>
<input type="submit" value="提交">
&nbsp;<input type="reset" value="取消">
</form><br>
</body>
</html>


<!-- a01a_select2.jsp文件 -->
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%@ page import="java.util.List"%>
     <%@ page import="bean1.a01a_select2"%>
      <%@ page import="bean1.User"%>
<!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>查詢頁面</title>
</head>
<body>
<p>查詢頁面</p>
<hr/>
<table>
<tr>
			<td>學號</td>
			<td>姓名</td>
			<td>性別</td>
			<td>年齡</td>
			<td>體重</td>
			<td>身高</td>
		</tr>
<%List<User> list2=(List<User>)(request.getAttribute("list"));
for(int i=0;i<list2.size();i++)
{
	User u=list2.get(i);
%>
<tr>
			<td><%=u.getId()%></td>
			<td><%=u.getName()%></td>
			<td><%=u.getSex()%></td>
			<td><%=u.getAge()%></td>
			<td><%=u.getHeight()%></td>
			<td><%=u.getHeight()%></td>
		</tr>
<%
}
%>
</table>
</body>
</html>


<!-- a01a_update1.jsp文件 -->
<%@ 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>修改信息頁面</title>
</head>
<body>
<p>請寫入修改信息</p>
<hr>
<form action="../a01a_update2" method="post">
		<table>
			<tr>
				<td>學號</td>
				<td><input type="text" name="id" ></td>
			</tr>
			<tr>
				<td>姓名</td>
				<td><input type="text" name="name"></td>
			</tr>
			<tr>
				<td>性別</td>
				<td><input type="text" name="sex"></td>
			</tr>
			<tr>
				<td>年齡</td>
				<td><input type="text" name="age"></td>
			</tr>
			<tr>
				<td>體重</td>
				<td><input type="text" name="weight"></td>
			</tr>
			<tr>
				<td>身高</td>
				<td><input type="text" name="height"></td>
			</tr>
			<tr align="center">
				<td><input type="submit" value="確認"></td>
				<td><input type="reset" value="取消"></td>
			</tr>
		</table>
	</form>
</body>
</html>


<!-- a01a_update2.jsp文件 -->
<%@ 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>更新界面</title>
</head>
<body>
<p>更新界面</p>
<hr>
<%
String a=request.getAttribute("number").toString();
int aa=Integer.parseInt(a);
if(aa>0) out.println("更新成功");
else out.println("更新失敗");
%> 
</body>
</html>

5.管理頁面

<%@ 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>學生身體體質信息管理系統</title>
</head>
<frameset rows="80,*">
<frame src="indextitle.jsp" scrolling="no">
<frameset cols="140,*">
<frame src="indexleft.jsp" scrolling="no">
<frame src="indexright.jsp" name="right" scrolling="no">
</frameset>
</frameset>
</html>


<%@ 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>菜單頁面</title>
</head>
<body>
<br><br><br><br>
<p><a href="../a01a_insert/a01a_insert1.jsp" target="right">添加學生</a></p>
<p><a href="../a01a_delete/a01a_delete1.jsp" target="right">按條件刪除學生</a></p>
<p><a href="../a01a_select/a01a_select1.jsp" target="right">按條件查詢學生</a></p>
<p><a href="../a01a_update/a01a_update1.jsp" target="right">按條件修改學生</a></p>
</body>
</html>


<%@ 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>Insert title here</title>
</head>
<body background="1.jpg">
</body>
</html>


<%@ 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>頁面標題</title>
</head>
<body>
<center><h1>學生身體體質信息管理系統</h1></center>
</body>
</html>

運行示例如下：

Java web--MVC開發模式介紹

一、jsp技術

二、Javabean技術

三、servlet技術

四、簡單的MVC開發模式介紹

五、基於MVC技術+Dao技術的學生信息管理系統的設計（Dao技術是一種數據庫連接技術）

DAPPER 事務 TRANSACTION

Java中線程的創建方式

java web--EL技術與JSTL技術簡介

Java web--利用java操作excel文檔

java web--java mail編程

java web--頁面分頁技術

數據庫基礎（二）--簡單的數據查詢

https://yachay.unat.edu.pe/blog/index.php?comment_area=format_blog&comment_component=blog&comment_co

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