JAVA课程之简易课程登记

实现技术JSP+Servlet+MySQL

思想：首先前台用jsp获取数据，然后用Form表单传值给Servlet，Servlet操作MySQL，获取数据再通过jsp显示

1.jsp功能选择界面

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <%@ page import ="MySQL.*" %>
 4 <!DOCTYPE html>
 5 <html>
 6 <head>
 7 <meta charset="UTF-8">
 8 <title>Insert title here</title>
 9 </head>
10 <body style="text-align: center;">
11 
12 
13 <!--设置body的样式 -->
14 <div id="menu" style="background-color:#D5D5D5;height:30px;;">
15 <!-- 添加标题 -->
16     <div id="content" style="float:left;">
17     课程基本信息管理系统
18     </div>
19 <!-- 添加div样式 -->
20 </div>
21 <div id="menu-m" style="background-color:#ccffff;height:40px;200px;text-align:center;">
22 <br>
23 <!-- 添加跳转的A标签 -->
24 <b><a href="add.jsp">添加新课程</a></b>
25 </div>
26 <div id="menu-m" style="background-color:#ccffff;height:40px;200px;text-align:center;">
27 <br><b><a href="delete.jsp">删除课程信息</a></b>
28 </div>
29 <div id="menu-m" style="background-color:#ccffff;height:40px;200px;text-align:center;">
30 <br>
31 <b><a href="search.jsp">查询课程信息</a></b>
32 </div>
33 <div id="menu-m" style="background-color:#ccffff;height:40px;200px;text-align:center;">
34 <br>
35 <b><a href="modification.jsp">修改课程信息</a></b>
36 </div>
37 
38 </body>
39 </html>

2.添加新课程（jsp+servlet）

add.jsp

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body style="text-align: center;">
10 
11 <div id="login">
12     <div id="form">
13     <fieldset>
14 
15     <legend>添加新课程</legend>
16     <form action="Add" name="add" method="get">
17        课程名称：<input type="text" name="addclass"><br>
18         上课老师：<input type="text" name="addteacher"><br>
19         上课地点：&nbsp&nbsp<input type="text" name="addplace"><br>
20         <input type="submit" value="添加">
21         <input type="reset" value="清空">
22         <br>
23     </form>
24 
25 </fieldset>
26     </div>
27 </div>
28 
29 </body>
30 </html>

对应的servlet

Add.java

  1 package MySQL;
  2 
  3 import java.io.IOException;
  4 import java.sql.Connection;
  5 import java.sql.DriverManager;
  6 import java.sql.PreparedStatement;
  7 import java.sql.ResultSet;
  8 import java.sql.SQLException;
  9 import java.sql.Statement;
 10 
 11 import javax.servlet.ServletException;
 12 import javax.servlet.annotation.WebServlet;
 13 import javax.servlet.http.HttpServlet;
 14 import javax.servlet.http.HttpServletRequest;
 15 import javax.servlet.http.HttpServletResponse;
 16 
 17 /**
 18  * Servlet implementation class Add
 19  */
 20 @WebServlet("/Add")
 21 public class Add extends HttpServlet {
 22     private static final long serialVersionUID = 1L;
 23     
 24     // JDBC 驱动名及数据库 URL
 25     static final String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver";  
 26     static final String DB_URL = "jdbc:mysql://localhost:3306/experiment?useSSL=false&serverTimezone=UTC";
 27     
 28     // 数据库的用户名与密码，需要根据自己的设置
 29     static final String USER = "root";
 30     static final String PASS = "HEIYANG";
 31     static boolean flag=true;
 32        
 33     /**
 34      * @see HttpServlet#HttpServlet()
 35      */
 36     public Add() {
 37         super();
 38         // TODO Auto-generated constructor stub
 39     }
 40 
 41     /**
 42      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 43      */
 44     @SuppressWarnings("resource")
 45     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 46         // TODO Auto-generated method stub
 47         
 48         response.setContentType("text/html;charset=UTF-8");
 49         response.getWriter().append("Served at: ").append(request.getContextPath());
 50         
 51         String addclass=request.getParameter("addclass");//获取输入
 52         String addteacher=request.getParameter("addteacher"); //获取输入
 53         String addplace =request.getParameter("addplace");//获取输入
 54         if(addplace.startsWith("一教")||addplace.startsWith("二教")||addplace.startsWith("三教")||addplace.startsWith("基教")) {
 55         //对教室的判断若不为这几个教室则无法录入
 56             if(addteacher.equals("王建民")||addteacher.equals("刘立嘉")||addteacher.equals("刘丹")||addteacher.equals("王辉")||addteacher.equals("杨子光")) {
 57         //对老师额判断
 58             //连接数据库
 59             Connection conn = null;
 60             Statement stmt = null;
 61             
 62             // 设置响应内容类型
 63             response.setContentType("text/html;charset=UTF-8");
 64     
 65             
 66             try{
 67                 
 68                 // 注册 JDBC 驱动器
 69                 Class.forName("com.mysql.jdbc.Driver");
 70                 
 71                 // 打开一个连接
 72                 conn = DriverManager.getConnection(DB_URL,USER,PASS);
 73               
 74                 // 执行 SQL 查询
 75                 stmt =  conn.createStatement();
 76                 String sql;
 77                 sql = "SELECT name FROM classroom";
 78                 ResultSet rs = stmt.executeQuery(sql);
 79                 // 展开结果集数据库
 80                 while(rs.next()){
 81                     // 通过字段检索
 82     
 83                     String username = rs.getString("name");
 84     
 85                     if(username.equals(addclass))
 86                         flag=false;
 87                 }
 88     
 89                 // 完成后关闭
 90                 rs.close();
 91                 stmt.close();
 92                 conn.close();
 93                 if(flag==true)
 94                 {
 95                     PreparedStatement stmt1 = null;
 96                     // 注册 JDBC 驱动器
 97                     Class.forName("com.mysql.jdbc.Driver");
 98                     
 99                     // 打开一个连接
100                     conn = DriverManager.getConnection(DB_URL,USER,PASS);
101                     
102                     String add= "INSERT into classroom values(?,?,?)";
103                     stmt1 =  conn.prepareStatement(add);
104                     ((PreparedStatement) stmt1).setString(1, addclass);
105                     ((PreparedStatement) stmt1).setString(2, addteacher );
106                     ((PreparedStatement) stmt1).setString(3, addplace);
107             
108                     stmt1.executeUpdate();
109     
110     
111                     // 完成后关闭
112                     stmt.close();
113                     conn.close();
114                     
115                 }
116                 
117     
118             } catch(SQLException se) {
119                 // 处理 JDBC 错误
120                 se.printStackTrace();
121             } catch(Exception e) {
122                 // 处理 Class.forName 错误
123                 e.printStackTrace();
124             }finally{
125                 // 最后是用于关闭资源的块
126                 try{
127                     if(stmt!=null)
128                     stmt.close();
129                 }catch(SQLException se2){
130                 }
131                 try{
132                     if(conn!=null)
133                     conn.close();
134                 }catch(SQLException se){
135                     se.printStackTrace();
136                 }
137             }
138             if(flag==true)
139                 {
140                 response.getWriter().print("<script language='javascript'>alert('操作失败！')</script>");
141                 response.setHeader("refresh", "1;function.jsp");
142                 }
143             else
144                 response.sendRedirect("add.jsp");
145             
146         }else
147             response.sendRedirect("add.jsp");
148         }
149         else
150             response.sendRedirect("add.jsp");
151         
152         
153         
154         
155         
156         
157 }
158     
159         
160 
161     /**
162      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
163      */
164     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
165         // TODO Auto-generated method stub
166         doGet(request, response);
167     }
168 
169 }

3.修改内容（jsp+servlet）

modification.jsp

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body style="text-align: center;">
10 
11 <div id="login">
12     <div id="form">
13     <fieldset>
14 
15     <legend>修改课程信息</legend>
16     <form action="Modification" name="add" method="get">
17        选择修改的课程名称：<input type="text" name="addclass0">&nbsp&nbsp修改后的课程名称：<input type="text" name="addclass1"><br>
18         选择修改的上课老师：<input type="text" name="addteacher0">&nbsp&nbsp修改后的上课老师：<input type="text" name="addteacher1"><br>
19         选择修改的上课地点：<input type="text" name="addplace0">&nbsp&nbsp修改后的上课地点：<input type="text" name="addplace1"><br>
20         <input type="submit" value="修改">
21         <input type="reset" value="清空">
22         <br>
23     </form>
24 
25 </fieldset>
26     </div>
27 </div>
28 </body>
29 </html>

对应的servlet：

Modification.java

  1 package MySQL;
  2 
  3 import java.io.IOException;
  4 import java.sql.Connection;
  5 import java.sql.DriverManager;
  6 import java.sql.PreparedStatement;
  7 import java.sql.ResultSet;
  8 import java.sql.SQLException;
  9 
 10 import javax.servlet.ServletException;
 11 import javax.servlet.annotation.WebServlet;
 12 import javax.servlet.http.HttpServlet;
 13 import javax.servlet.http.HttpServletRequest;
 14 import javax.servlet.http.HttpServletResponse;
 15 
 16 /**
 17  * Servlet implementation class Modification
 18  */
 19 @WebServlet("/Modification")
 20 public class Modification extends HttpServlet {
 21     private static final long serialVersionUID = 1L;
 22        
 23     
 24     // JDBC 驱动名及数据库 URL
 25     static String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver";  
 26     static String DB_URL = "jdbc:mysql://localhost:3306/experiment?useSSL=false&serverTimezone=UTC";
 27     
 28     
 29     // 数据库的用户名与密码，需要根据自己的设置
 30     static String USER = "root";
 31     static String PASS = "HEIYANG";
 32     /**
 33      * @see HttpServlet#HttpServlet()
 34      */
 35     public Modification() {
 36         super();
 37         // TODO Auto-generated constructor stub
 38     }
 39 
 40     /**
 41      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 42      */
 43     @SuppressWarnings("resource")
 44     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 45         // TODO Auto-generated method stub
 46         response.getWriter().append("Served at: ").append(request.getContextPath());
 47         
 48          Connection conn =null;
 49          PreparedStatement stmt = null;
 50          ResultSet rs = null;
 51          boolean Flag=false;
 52          
 53          String class0=request.getParameter("addclass0");//获取输入
 54          String class1=request.getParameter("addclass1");//获取输入
 55          String teacher0=request.getParameter("addteacher0");//获取输入
 56          String teacher1=request.getParameter("addteacher1");//获取输入
 57          String place0=request.getParameter("addplace0");//获取输入
 58          String place1=request.getParameter("addplace1");//获取输入
 59   
 60          try{
 61              
 62              try {
 63                 Class.forName("com.mysql.jdbc.Driver");
 64                 conn = DriverManager.getConnection(DB_URL,USER,PASS);
 65             } catch (ClassNotFoundException e) {
 66                 // TODO Auto-generated catch block
 67                 e.printStackTrace();
 68             }
 69              
 70              String sql;
 71              System.out.println("数据库连接成功");
 72              if(class0!=null)
 73              {
 74                   sql="update classroom set name='"+class1+"' where name='"+class0+"'";
 75                   stmt = conn.prepareStatement(sql);
 76                   stmt.executeUpdate();
 77              }
 78              if(teacher0!=null)
 79              {
 80                      sql="update classroom set teacher='"+teacher1+"' where teacher='"+teacher0+"'";
 81                      stmt = conn.prepareStatement(sql);
 82                      stmt.executeUpdate();
 83              }
 84              if(place0!=null)
 85              {
 86                      sql="update classroom set place='"+place1+"' where place='"+place0+"'";
 87                      stmt = conn.prepareStatement(sql);
 88                      stmt.executeUpdate();
 89                  
 90              }
 91             
 92              System.out.println("success");
 93              Flag=true;
 94 //        out.flush();
 95 //        out.close();
 96     }catch (SQLException e) {
 97             e.printStackTrace();
 98         }finally {
 99             try {
100                 //注意关闭原则：从里到外
101                     if (rs != null) {
102                         rs.close();
103                     }
104                     if (stmt != null) {
105                         stmt.close();
106                     }
107                     if (conn != null) {
108                         conn.close();
109                     }
110                 } catch (SQLException e) {
111                     e.printStackTrace();
112                 }
113             }
114         if(Flag==true)
115             response.sendRedirect("function.jsp");
116         else
117             response.sendRedirect("modification.jsp");
118     }
119 
120     /**
121      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
122      */
123     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
124         doGet(request, response);
125     }
126 
127 }

4.删除（jsp+servlet）

delete.jsp

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body style="text-align: center;">
10 
11 <div id="login">
12     <div id="form">
13     <fieldset>
14     <legend>删除课程信息</legend>
15     <form action="delete" name="add" method="get">
16        要删除的课程名称：<input type="text" name="addclass"><br>
17         要删除的上课老师：<input type="text" name="addteacher"><br>
18         要删除的上课地点：&nbsp&nbsp<input type="text" name="addplace"><br>
19         <input type="submit" value="删除">
20         <input type="reset" value="清空">
21         <br>
22     </form>
23 
24 </fieldset>
25     </div>
26 </div>
27 
28 </body>
29 </html>

delete.java

  1 package MySQL;
  2 
  3 import java.io.IOException;
  4 import java.sql.Connection;
  5 import java.sql.DriverManager;
  6 import java.sql.PreparedStatement;
  7 import java.sql.ResultSet;
  8 import java.sql.SQLException;
  9 import java.sql.Statement;
 10 
 11 import javax.servlet.ServletException;
 12 import javax.servlet.annotation.WebServlet;
 13 import javax.servlet.http.HttpServlet;
 14 import javax.servlet.http.HttpServletRequest;
 15 import javax.servlet.http.HttpServletResponse;
 16 
 17 import com.mysql.cj.protocol.Resultset;
 18 
 19 
 20 /**
 21  * Servlet implementation class delete
 22  */
 23 @WebServlet("/delete")
 24 public class delete extends HttpServlet {
 25     private static final long serialVersionUID = 1L;
 26     
 27     // JDBC 驱动名及数据库 URL
 28     static String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver";  
 29     static String DB_URL = "jdbc:mysql://localhost:3306/experiment?useSSL=false&serverTimezone=UTC";
 30     
 31     // 数据库的用户名与密码，需要根据自己的设置
 32     static String USER = "root";
 33     static String PASS = "HEIYANG";
 34     
 35     //连接数据库
 36     static Connection conn = null;
 37     static PreparedStatement stmt = null;
 38     
 39     /**
 40      * @see HttpServlet#HttpServlet()
 41      */
 42     public delete() {
 43         super();
 44         // TODO Auto-generated constructor stub
 45     }
 46 
 47     /**
 48      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 49      */
 50     @SuppressWarnings("unused")
 51     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 52         // TODO Auto-generated method stub
 53         boolean Flag=false;
 54         response.setContentType("text/html;charset=UTF-8");
 55         response.getWriter().append("Served at: ").append(request.getContextPath());
 56         
 57         String delclass=request.getParameter("addclass");//获取输入
 58         String delteacher=request.getParameter("addteacher"); //获取输入
 59         String adelplace =request.getParameter("addplace");//获取输入
 60         
 61         String del1= "DELETE from classroom where name=?";
 62         String del2= "DELETE from classroom where teacher=?";
 63         String del3= "DELETE from classroom where place=?";
 64         
 65         try {
 66             Class.forName("com.mysql.jdbc.Driver");
 67             Connection conn = DriverManager.getConnection(DB_URL,USER,PASS);
 68             if(delclass!=null)
 69             {
 70                 stmt = conn.prepareStatement(del1);
 71                 stmt.setString(1,delclass);
 72                 int rs = stmt.executeUpdate();
 73                 Flag=true;
 74             }
 75             else if(delteacher!=null)
 76             {
 77                 stmt = conn.prepareStatement(del2);
 78                 stmt.setString(2,delteacher);
 79                 int rs = stmt.executeUpdate();
 80                 Flag=true;
 81             }
 82             else if(adelplace!=null)
 83             {
 84                 stmt = conn.prepareStatement(del3);
 85                 stmt.setString(3,adelplace);
 86                 int rs = stmt.executeUpdate();
 87                 Flag=true;
 88             }
 89 
 90             
 91             stmt.close();
 92             conn.close();
 93             if(Flag==true) {
 94                 response.getWriter().print("<script language='javascript'>alert('操作失败！')</script>");
 95                 response.setHeader("refresh", "1;function.jsp");
 96             //    response.sendRedirect("function.jsp");
 97             }
 98             else
 99                 response.sendRedirect("delete.jsp");
100         } catch (SQLException | ClassNotFoundException e) {
101             // TODO Auto-generated catch block
102             e.printStackTrace();
103         }
104 
105 
106             
107 
108             
109             
110 
111 
112     }
113 
114     /**
115      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
116      */
117     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
118         // TODO Auto-generated method stub
119         doGet(request, response);
120     }
121 
122 }

5.查找（jsp+servlet）

search.jsp

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body style="text-align: center;">
10 
11 <div id="login">
12     <div id="form">
13     <fieldset>
14     <legend>查询课程信息</legend>
15     <form action="display" name="add" method="get">
16        课程名称：<input type="text" name="class"><br>
17         上课老师：<input type="text" name="teacher"><br>
18         上课地点：&nbsp&nbsp<input type="text" name="place"><br>
19         <input type="submit" value="查询">
20         <input type="reset" value="清空">
21         <br>
22     </form>
23 </fieldset>
24     </div>
25 </div>
26 
27 
28 
29 
30 </body>
31 </html>

display.java

  1 package MySQL;
  2 
  3 import java.io.IOException;
  4 import java.io.PrintWriter;
  5 import java.sql.Connection;
  6 import java.sql.DriverManager;
  7 import java.sql.ResultSet;
  8 import java.sql.SQLException;
  9 import java.sql.Statement;
 10 import java.util.LinkedList;
 11 import java.util.List;
 12 
 13 import javax.servlet.ServletException;
 14 import javax.servlet.annotation.WebServlet;
 15 import javax.servlet.http.HttpServlet;
 16 import javax.servlet.http.HttpServletRequest;
 17 import javax.servlet.http.HttpServletResponse;
 18 
 19 /**
 20  * Servlet implementation class display
 21  */
 22 @WebServlet("/display")
 23 public class display extends HttpServlet {
 24     private static final long serialVersionUID = 1L;
 25        
 26     
 27     /**
 28      * @see HttpServlet#HttpServlet()
 29      */
 30     public display() {
 31         super();
 32         // TODO Auto-generated constructor stub
 33     }
 34 
 35     /**
 36      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 37      */
 38     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 39         // TODO Auto-generated method stub
 40         response.setContentType("text/html;charset=utf-8");
 41 
 42         response.setContentType("text/html");
 43         
 44         response.getWriter().append("Served at: ").append(request.getContextPath());
 45         
 46         String addclass=request.getParameter("class");//获取输入
 47         String addteacher=request.getParameter("teacher"); //获取输入
 48         String addplace =request.getParameter("place");//获取输入
 49         
 50         // 设置响应内容类型
 51         response.setContentType("text/html;charset=utf-8");
 52         response.setContentType("text/html;charset=GBK");
 53         response.setContentType("text/html");
 54         
 55         Connection connection = null;
 56         Statement statement = null;
 57         ResultSet resultSet = null;
 58         PrintWriter printWriter = response.getWriter();
 59         List<String> list = new LinkedList<String>();
 60               try {
 61                 Class.forName("com.mysql.jdbc.Driver");
 62                  String url = "jdbc:mysql://localhost:3306/experiment?useSSL=false&serverTimezone=UTC";
 63                   connection = DriverManager.getConnection(url, "root", "HEIYANG");
 64                   statement = connection.createStatement();
 65                   
 66                   resultSet = statement.executeQuery("SELECT  name,teacher,place FROM classroom");
 67                   printWriter.print("<html><head><title>Servlet连接数据库</title></head>");
 68                   printWriter.print("<body><table border=1 align="center">");
 69                   
 70                   while (resultSet.next()) {
 71                       if(addclass!=null) {
 72                           if((resultSet.getString("name")).indexOf(addclass)!=-1) {
 73                               printWriter.print("<tr>");
 74                               printWriter.print("<td>" + resultSet.getString("name") + "</td>"+"<td>" + resultSet.getString("teacher") + "</td>"+"<td>" + resultSet.getString("place") + "</td>");
 75                               printWriter.print("</tr>");
 76                           }
 77                       }
 78                       else if(addteacher!=null) {
 79                           if((resultSet.getString("teacher")).indexOf(addteacher)!=-1)
 80                           {
 81                               printWriter.print("<tr>");
 82                               printWriter.print("<td>" + resultSet.getString("name") + "</td>"+"<td>" + resultSet.getString("teacher") + "</td>"+"<td>" + resultSet.getString("place") + "</td>");
 83                               printWriter.print("</tr>");
 84                               String name=resultSet.getString("name");
 85                               list.add(name);
 86                           }
 87                       }
 88                       else if(addplace!=null) {
 89                     
 90                           if((resultSet.getString("place")).indexOf(addplace)!=-1)
 91                           {
 92                               printWriter.print("<tr>");
 93                               printWriter.print("<td>" + resultSet.getString("name") + "</td>"+"<td>" + resultSet.getString("teacher") + "</td>"+"<td>" + resultSet.getString("place") + "</td>");
 94                               printWriter.print("</tr>");
 95                           }
 96                       }
 97                   }
 98               }catch (ClassNotFoundException e) {
 99                     // TODO Auto-generated catch block
100                     e.printStackTrace();
101                 } catch (SQLException e) {
102                     // TODO Auto-generated catch block
103                     e.printStackTrace();
104                 }finally {
105               try {
106                  // resultSet.close();
107                   statement.close();
108                   connection.close();
109             } catch (SQLException e) {
110                 // TODO Auto-generated catch block
111                 e.printStackTrace();
112             }
113            }
114              
115              request.setAttribute( "list ",list); 
116              request.getRequestDispatcher("show.jsp").forward(request,response); 
117 
118     }
119 
120     /**
121      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
122      */
123     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
124         // TODO Auto-generated method stub
125         doGet(request, response);
126     }
127 
128 }

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原文地址：https://www.cnblogs.com/heiyang/p/10093627.html