Init

.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+.idea
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

helloGithub.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="FacetManager">
+    <facet type="web" name="Web">
+      <configuration>
+        <descriptors>
+          <deploymentDescriptor name="web.xml" url="file://$MODULE_DIR$/web/WEB-INF/web.xml" />
+        </descriptors>
+        <webroots>
+          <root url="file://$MODULE_DIR$/web" relative="/" />
+        </webroots>
+      </configuration>
+    </facet>
+  </component>
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="libs" level="project" />
+  </component>
+</module>

src/com/hellogithub/filter/SessionFilter.java

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+package com.hellogithub.filter;
+
+
+import jakarta.servlet.*;
+import jakarta.servlet.annotation.WebFilter;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import jakarta.servlet.http.HttpSession;
+
+import java.io.IOException;
+
+/**
+ * 过滤器
+ */
+@WebFilter("/system/*")// 过滤器所有的请求
+public class SessionFilter implements Filter {
+    private String[] excludeUrls = new String[]{""}; //过滤器排除的请求url 格式:”/login“
+
+    /**
+     * 过滤器
+     *
+     * @param servletRequest
+     * @param servletResponse
+     * @param filterChain
+     * @throws IOException,ServletException
+     */
+    @Override
+    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
+        // 从session获取到用户的会话信息 判断用户是否登录过
+        HttpServletRequest httpServletRequest = (HttpServletRequest) servletRequest;
+        HttpServletResponse httpServletResponse = (HttpServletResponse) servletResponse;
+        String contextPath = httpServletRequest.getContextPath();
+        // 定义一个数组  排除的请求
+        for (int i = 0; i < excludeUrls.length; i++) {
+            String excludeUrl = contextPath + excludeUrls[i];
+            String requestURI = httpServletRequest.getRequestURI();
+            if (excludeUrl.equals(requestURI)) {
+                // 放行请求
+                filterChain.doFilter(httpServletRequest, httpServletResponse);
+                return;
+            }
+        }
+        // 排除请求
+        HttpSession session = httpServletRequest.getSession();
+        Object user = session.getAttribute("user");
+        if (user == null) {
+            // 当前用户没有登录或者登录会话失效
+            // 重定向到登录页面
+            httpServletResponse.sendRedirect(contextPath + "/");
+            return;
+        }
+        // 用户已经登录了 正常放行请求
+        filterChain.doFilter(httpServletRequest, httpServletResponse);
+    }
+}
+

src/com/hellogithub/utils/JdbcUtils.java

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+package com.hellogithub.utils;
+
+
+import java.io.InputStream;
+import java.sql.*;
+import java.util.Properties;
+
+/**
+ * 工具类：jdbc
+ * */
+public class JdbcUtils {
+
+    private JdbcUtils() {
+
+    }
+
+    /**
+     * 声明变量
+     * driverClass : jdbc驱动
+     * url : jdbc链接url
+     * user : 数据库用户名
+     * password : 数据库密码
+     */
+    private static String driverClass;
+    private static String url;
+    private static String user;
+    private static String password;
+
+    /**
+     *2.使用静态代码快 给jdbc变量赋值（读取config.properties）
+     */
+    static {
+        try {
+            // 1.读取config.properties  IO 路径 相对路径
+            InputStream resourceAsStream = JdbcUtils.class.getClassLoader().
+                    getResourceAsStream("config.properties");
+            // 2.赋值给我们声明好的变量
+            Properties properties = new Properties();
+            properties.load(resourceAsStream);
+            driverClass = properties.getProperty("driverClass");
+            url = properties.getProperty("url");
+            user = properties.getProperty("user");
+            password = properties.getProperty("password");
+            // 3.注册驱动类
+            Class.forName(driverClass);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * 3.封装连接方法
+     *
+     * @throws SQLException
+     */
+    public static Connection getConnection() throws SQLException {
+        Connection connection = DriverManager.getConnection(url, user, password);
+        return connection;
+    }
+
+    /**
+     * 3.封装释放连接方法 (重载)
+     *
+     * @param resultSet
+     * @param statement
+     * @param connection
+     */
+    public static void closeConnection(ResultSet resultSet, Statement statement, Connection connection) {
+        // 1.查询 释放连接 resultSet  statement connection
+        try {
+            if (resultSet != null)
+                resultSet.close();
+            if (statement != null)
+                statement.close();
+            if (connection != null)
+                connection.close();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+    }
+
+    /**
+     * 4.增删改---释放jdbc资源
+     *
+     * @param statement
+     * @param connection
+     */
+    public static void closeConnection(Statement statement, Connection connection) {
+        // 1.查询 释放连接 resultSet  statement connection
+        closeConnection(null, statement, connection);
+    }
+
+    /**
+     * 5.开启事务
+     *
+     * @param connection
+     * @throws SQLException
+     */
+    public static void beginTransaction(Connection connection) throws SQLException {
+        connection.setAutoCommit(false);
+    }
+
+    /**
+     * 6.提交事务
+     *
+     * @param connection
+     * @throws SQLException
+     */
+    public static void commitTransaction(Connection connection) throws SQLException {
+        connection.commit();
+    }
+
+    /**
+     * 7.回滚事务
+     *
+     * @param connection
+     */
+    public static void rollBackTransaction(Connection connection) {
+        if (connection != null) {
+            try {
+                connection.rollback();
+            } catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    /**
+     * 8.关闭事务
+     *
+     * @param connection
+     */
+    public static void endTransaction(Connection connection) {
+        if (connection != null) {
+            try {
+                connection.setAutoCommit(true);
+            } catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+}
+

src/com/hellogithub/utils/RandomValidateCode.java

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+package com.hellogithub.utils;
+
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import jakarta.servlet.http.HttpSession;
+
+import javax.imageio.ImageIO;
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.util.Random;
+
+/**
+ * 工具类: 生成随机验证码
+ */
+public class RandomValidateCode {
+    public static final String RANDOMVALIDATECODE = "RandomValidateCode";// 放到session中的key
+    private Random random = new Random();
+    private String randString = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生的字符串
+    private int width = 100;// 图片宽度
+    private int height = 26;// 图片高度
+    private int lineSize = 40;// 干扰线数量
+    private int stringNum = 4;// 随机产生的字符数量
+
+    /**
+     * 获得字体
+     */
+    private Font getFont() {
+        return new Font("Fixedsys", Font.CENTER_BASELINE, 18);
+    }
+
+    /**
+     * 获得颜色
+     *
+     * @param bc
+     * @param fc
+     */
+    private Color getRandColor(int fc, int bc) {
+        if (fc > 255)
+            fc = 255;
+        if (bc > 255)
+            bc = 255;
+        int r = fc + random.nextInt(bc - fc - 16);
+        int g = fc + random.nextInt(bc - fc - 14);
+        int b = fc + random.nextInt(bc - fc - 18);
+        return new Color(r, g, b);
+    }
+
+    /**
+     * 生成随机图片
+     *
+     * @param request
+     * @param response
+     */
+    public void getRandcode(HttpServletRequest request, HttpServletResponse response) {
+        HttpSession session = request.getSession();
+        // BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
+        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
+        Graphics g = image.getGraphics();// 产生Image对象的Graphics对象,该对象可以在图像上进行各种绘制操作
+        g.fillRect(0, 0, width, height);
+        g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));
+        g.setColor(getRandColor(110, 133));
+        // 绘制干扰线
+        for (int i = 0; i <= lineSize; i++) {
+            drowLine(g);
+        }
+        // 绘制随机字符
+        String randomString = "";
+        for (int i = 1; i <= stringNum; i++) {
+            randomString = drowString(g, randomString, i);
+        }
+        session.removeAttribute(RANDOMVALIDATECODE);
+        session.setAttribute(RANDOMVALIDATECODE, randomString);
+        g.dispose();
+        try {
+            ImageIO.write(image, "JPEG", response.getOutputStream());// 将内存中的图片通过流动形式输出到客户端
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * 绘制字符串
+     *
+     * @param g
+     * @param randomString
+     * @param i
+     */
+    private String drowString(Graphics g, String randomString, int i) {
+        g.setFont(getFont());
+        g.setColor(new Color(random.nextInt(101), random.nextInt(111), random.nextInt(121)));
+        String rand = getRandomString(random.nextInt(randString.length()));
+        randomString += rand;
+        g.translate(random.nextInt(3), random.nextInt(3));
+        g.drawString(rand, 13 * i, 16);
+        return randomString;
+    }
+
+    /**
+     * 绘制干扰线
+     *
+     * @param g
+     */
+    private void drowLine(Graphics g) {
+        int x = random.nextInt(width);
+        int y = random.nextInt(height);
+        int xl = random.nextInt(13);
+        int yl = random.nextInt(15);
+        g.drawLine(x, y, x + xl, y + yl);
+    }
+
+    /**
+     * 获取随机的字符
+     *
+     * @param num
+     */
+    public String getRandomString(int num) {
+        return String.valueOf(randString.charAt(num));
+    }
+}

web/WEB-INF/web.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
+         version="4.0">
+</web-app>

web/index.jsp

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+<%--
+  Created by IntelliJ IDEA.
+  User: LDQ
+  Date: 2023/6/27
+  Time: 15:31
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+  <head>
+    <title>$Title$</title>
+  </head>
+  <body>
+  $END$
+  </body>
+</html>