archieve: homework8

2025-06-04 12:52:58 +08:00
parent 66ecb7c3ab
commit 9fa6447eea
16 changed files with 11165 additions and 8 deletions
@@ -0,0 +1,78 @@
+package com.msksbr.homework8.dao;
+
+import org.yaml.snakeyaml.Yaml;
+
+import java.io.InputStream;
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.Statement;
+import java.util.Map;
+
+public class ConnDB {
+    private static final DBInfo dbInfo = new DBInfo();
+    public Connection conn = null;
+    public Statement stmt = null;
+    public ResultSet rs = null;
+
+    public ConnDB() {
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+            conn = java.sql.DriverManager.getConnection(dbInfo.getUrl(), dbInfo.username, dbInfo.password);
+            stmt = conn.createStatement();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    public ResultSet executeQuery(String query) {
+        try {
+            rs = this.stmt.executeQuery(query);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return rs;
+    }
+
+    public void executeUpdate(String query) {
+        try {
+            this.stmt.executeUpdate(query);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    static class DBInfo {
+        String address;
+        String port;
+        String username;
+        String password;
+        String database;
+        String yaml_url = "/dbInfo.yaml";
+
+        public DBInfo() {
+            Map<String, String> dbInfo = loadYaml();
+            this.address = dbInfo.get("address");
+            this.port = dbInfo.get("port");
+            this.username = dbInfo.get("username");
+            this.password = dbInfo.get("password");
+            this.database = dbInfo.get("database");
+        }
+
+        public Map<String, String> loadYaml() {
+            Yaml yaml = new Yaml();
+            try (InputStream inputStream = DBInfo.class.getResourceAsStream(yaml_url)) {
+                if (inputStream == null) {
+                    throw new RuntimeException("YAML file not found" + yaml_url);
+                }
+                return yaml.load(inputStream);
+            } catch (Exception e) {
+                throw new RuntimeException("Failed to load YAML file", e);
+            }
+        }
+
+        public String getUrl() {
+            String url = "jdbc:mysql://" + this.address + ":" + this.port + "/" + this.database;
+            return url;
+        }
+    }
+}
@@ -0,0 +1,9 @@
+# this is a sample of yaml file for dbInfo.yaml
+# you can change the value of the key to your own value
+# 1. copy this file to the same directory as dbInfo.yaml
+# 2. change the value of the key to your own value
+address: "localhost"
+port: "3306"
+username: "root"
+password: "123456"
+database: "master"
@@ -0,0 +1,55 @@
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>Ajax</title>
+    <script type="text/javascript"
+            src="${pageContext.request.contextPath}/jquery-3.6.0.js"></script>
+    <script type="text/javascript">
+        $(document).ready(function(){
+            $("button").click(function(){
+                $.ajax({
+                    type:"post",				//提交方式
+                    url:'${pageContext.request.contextPath}/AJAXServlet',
+                    data:{
+                        userName:  $("#userName").val(),
+                        password:  $("#password").val()
+                    },              			//data中的内容会自动的添加到url后面
+                    dataType: "text",    		//返回数据的格式
+                    success:function(a){      	//请求成功后执行的函数
+                        if(a=="true"){
+                            $('#suss').html("登录成功!")
+                        }else{
+                            $('#suss').html("登录失败!")
+                        }
+                    },
+                    error :function () {      	//请求失败后执行的函数
+                        alert("请求失败");
+                    },
+                });
+            });
+        });
+    </script>
+</head>
+<body>
+<div>
+    <div>
+        <ul>
+            <li>用户名：</li>
+            <li><input id="userName" name="userName" type="text" /></li>
+        </ul>
+    </div>
+    <div>
+        <ul>
+            <li>密码：</li>
+            <li><input id="password" name="password" type="password"/></li>
+        </ul>
+    </div>
+    <div>
+        <ul>
+            <li><button>登录</button></li>
+        </ul>
+    </div>
+    <div id="suss"></div>
+</div>
+</body>
+</html>
@@ -0,0 +1,17 @@
+<%@ page language="java" contentType="text/html;charset=UTF-8"
+         pageEncoding="UTF-8" %>
+<%@page import="java.sql.*" %>
+<jsp:useBean id="conn" class="com.msksbr.homework8.dao.ConnDB"
+             scope="page"></jsp:useBean>
+<ul>
+  <%
+    ResultSet rs=conn.executeQuery("select title from info order by id desc");
+    if(rs.next()){
+      do{
+        out.print("<li>"+rs.getString(1)+"</li>");
+      }while (rs.next());
+    }else{
+      out.print("<li>暂无公告信息！</li>");
+    }
+  %>
+</ul>
@@ -1,13 +1,26 @@
-<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
-<!DOCTYPE html>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
 <html>
 <head>
-    <title>JSP - Hello World</title>
+    <title>index</title>
+    <script type="text/javascript"
+            src="${pageContext.request.contextPath}/jquery-3.6.0.js"></script>
+    <script language="JavaScript">
+        function getInfo() {
+            $.get("${pageContext.request.contextPath}/getInfo.jsp?nocache=" + new Date().getTime(), function (data) {
+                $("#showInfo").html(data);
+            });
+        }
+
+        $(document).ready(function () {
+            getInfo();//调用getInfo()方法获取公告信息
+            window.setInterval("getInfo()", 600000);
+        })
+    </script>
 </head>
 <body>
-<h1><%= "Hello World!" %>
-</h1>
-<br/>
-<a href="hello-servlet">Hello Servlet</a>
+<section>
+    <marquee id="showInfo" direction="up" scrollamount="3">
+    </marquee>
+</section>
 </body>
-</html>
+</html>