java不同版本特性示例

demo3/src/main/java/top/yexuejc/demo/Demo2Application.java

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+package top.yexuejc.demo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Demo2Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Demo2Application.class, args);
+    }
+
+}

demo3/src/main/java/top/yexuejc/demo/config/GlobalExceptionHandler.java

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+package top.yexuejc.demo.config;
+
+import java.util.List;
+
+import jakarta.servlet.http.HttpServletRequest;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.BindingResult;
+import org.springframework.validation.ObjectError;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+import org.springframework.web.servlet.ModelAndView;
+
+/**
+ * @author maxiaofeng
+ * @date 2025/7/3 18:27
+ */
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+    private static final Logger log = LoggerFactory.getLogger(GlobalExceptionHandler.class);
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public Object handleValidationExceptions(MethodArgumentNotValidException ex, HttpServletRequest request) {
+
+        log.error("参数校验异常: ", ex);
+
+        BindingResult result = ex.getBindingResult();
+        List<String> errorMessages = result.getAllErrors().stream().map(ObjectError::getDefaultMessage).toList();
+
+        if (request.getContentType() != null && request.getContentType().contains("application/json")) {
+            // 返回 JSON 错误信息
+            return new ResponseEntity<>(errorMessages, HttpStatus.BAD_REQUEST);
+        } else {
+            // 返回错误页面或重定向到原页面
+            ModelAndView modelAndView = new ModelAndView("login"); // 示例页面名
+            modelAndView.addObject("error", errorMessages);
+            return modelAndView;
+        }
+    }
+}

demo3/src/main/java/top/yexuejc/demo/config/SecurityConfig.java

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+package top.yexuejc.demo.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.security.web.SecurityFilterChain;
+
+@Configuration
+@EnableWebSecurity
+public class SecurityConfig {
+
+    @Bean
+    public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
+        http
+            .authorizeHttpRequests(auth -> auth
+                .requestMatchers("/", "/home", "/login/**", "/register", "/css/**", "/js/**", "/images/**").permitAll()
+                .anyRequest().authenticated()
+            )
+            .formLogin(form -> form
+                .loginPage("/login")
+                .defaultSuccessUrl("/home")
+                .failureUrl("/login?error=true")
+                .permitAll()
+            )
+            .logout(logout -> logout
+                .logoutSuccessUrl("/login?logout=true")
+                .permitAll()
+            );
+        return http.build();
+    }
+
+    @Bean
+    public PasswordEncoder passwordEncoder() {
+        return new BCryptPasswordEncoder();
+    }
+}

demo3/src/main/java/top/yexuejc/demo/config/ThymeleafConfig.java

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+package top.yexuejc.demo.config;
+
+import nz.net.ultraq.thymeleaf.layoutdialect.LayoutDialect;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.thymeleaf.spring6.SpringTemplateEngine;
+import org.thymeleaf.spring6.templateresolver.SpringResourceTemplateResolver;
+
+/**
+ * @author maxiaofeng
+ * @date 2025/7/4 18:28
+ */
+@Configuration
+public class ThymeleafConfig {
+    @Bean
+    public SpringTemplateEngine templateEngine(SpringResourceTemplateResolver templateResolver) {
+        SpringTemplateEngine engine = new SpringTemplateEngine();
+        engine.addDialect(new LayoutDialect());
+        engine.setTemplateResolver(templateResolver);
+        return engine;
+    }
+}

demo3/src/main/java/top/yexuejc/demo/model/LoginVO.java

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+package top.yexuejc.demo.model;
+
+import java.io.Serializable;
+
+import jakarta.validation.constraints.NotBlank;
+
+/**
+ * @author maxiaofeng
+ * @date 2025/7/3 16:39
+ */
+public record LoginVO(@NotBlank(message = "账号不能为空") String username,
+                      @NotBlank(message = "密码不能为空") String password) implements Serializable {
+
+}
+
+//@Data
+//public class LoginVO implements Serializable {
+//    @NotBlank
+//    private String username;
+//    private String password;
+//}
+

demo3/src/main/java/top/yexuejc/demo/web/IndexCtrl.java

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+package top.yexuejc.demo.web;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.servlet.ModelAndView;
+
+/**
+ * @author maxiaofeng
+ * @date 2025/7/3 18:43
+ */
+@Controller
+public class IndexCtrl {
+
+    @RequestMapping("/")
+    public ModelAndView index() {
+        return new ModelAndView("index");
+    }
+}

demo3/src/main/java/top/yexuejc/demo/web/LoginCtrl.java

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+package top.yexuejc.demo.web;
+
+import java.util.Map;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.json.JsonMapper;
+import jakarta.validation.Valid;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.MediaType;
+import org.springframework.stereotype.Controller;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.servlet.ModelAndView;
+import top.yexuejc.demo.model.LoginVO;
+
+/**
+ * @author maxiaofeng
+ * @date 2025/7/3 16:37
+ */
+@Controller
+@RequestMapping("/login")
+public class LoginCtrl {
+
+    private static final Logger log = LoggerFactory.getLogger(LoginCtrl.class);
+
+    @GetMapping("")
+    public ModelAndView page(ModelAndView mv, @RequestParam Map<String, Object> params) {
+        mv.addAllObjects(params);
+        mv.setViewName("login");
+        return mv;
+    }
+
+    @GetMapping("/get")
+    public String loginGet(@Valid LoginVO loginVO) throws JsonProcessingException {
+        log.info(new JsonMapper().writeValueAsString(loginVO));
+        return "redirect:/";
+    }
+
+    @PostMapping(value = "/postJson", consumes = MediaType.APPLICATION_JSON_VALUE)
+    public String loginPostJson(@RequestBody @Validated LoginVO loginVO) throws JsonProcessingException {
+        log.info(new JsonMapper().writeValueAsString(loginVO));
+        return "redirect:/";
+    }
+
+    @PostMapping(value = "/postFrom", consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE)
+    public String loginPostFrom(@Validated LoginVO loginVO) throws JsonProcessingException {
+        log.info(new JsonMapper().writeValueAsString(loginVO));
+        return "redirect:/";
+    }
+}

demo3/src/main/resources/application.properties

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+spring.application.name=demo2
+
+
+spring.thymeleaf.prefix=classpath:/templates/
+spring.thymeleaf.suffix=.html
+spring.thymeleaf.mode=HTML
+spring.thymeleaf.cache=false
+spring.thymeleaf.encoding=UTF-8
+spring.thymeleaf.servlet.content-type=text/html

demo3/src/main/resources/static/css/common/main.css

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+/**
+ * 
+ * @author maxiaofeng
+ * @date 2025/7/4 17:33
+ */
+/* 移动设备样式 */
+@media screen and (max-width: 760px) {
+    .ui-menu {
+        display: none;
+    }
+
+    .ui-main-container {
+        width: 100%;
+        display: flex;
+        flex-direction: column;
+    }
+
+    .ui-header {
+        height: 50px;
+        background-color: #14ccff50;
+    }
+
+    .ui-content {
+        flex: 1;
+        background: #d2fe8650;
+    }
+}
+
+/* 桌面设备样式 */
+@media screen and (min-width: 760px) {
+    .ui-menu {
+        display: block;
+        width: 200px;
+        height: 100vh;
+        background-color: #834f4f50;
+        position: fixed; /* 固定位置 */
+        left: 0;
+        top: 0;
+        transition: width 0.3s ease-in-out;
+        overflow: hidden;
+    }
+
+    .ui-main-container {
+        margin-left: 200px; /* 给侧边栏留出空间 */
+        display: flex;
+        flex-direction: column;
+        height: 100vh; /* 占满整个视口高度 */
+        transition: width 0.3s ease-in-out;
+    }
+
+    .ui-content {
+        flex: 1;
+        background: #d2fe8650;
+        padding: 10px;
+    }
+
+    .ui-header {
+        height: 50px;
+        background-color: #14ccff50;
+    }
+
+    .h-container {
+        display: flex;
+        flex-direction: row; /* 横向排列 */
+        align-items: center; /* 垂直居中对齐 */
+        justify-content: space-between; /* 左右撑开 */
+        width: 100%; /* 确保占满宽度 */
+        height: 50px;
+    }
+
+    .h-icon-menu {
+        height: 20px;
+        margin: 0 10px;
+    }
+    .h-icon-menu-hide {
+        display: block;
+    }
+
+    .h-icon-menu-show {
+        display: none;
+    }
+
+    .h-sys-name {
+        font-size: 20px;
+    }
+
+    .h-right-container {
+        display: flex;
+        align-items: center;
+        margin-left: auto;
+        height: 100%;
+    }
+
+    .h-notice {
+        display: flex;
+        align-items: center;
+    }
+
+    .h-user-info {
+        display: flex;
+        align-items: center;
+        margin: 0 10px;
+        height: 100%;
+    }
+
+    .h-user-avatar {
+        height: 100%;
+        display: flex;
+        align-items: center;
+    }
+
+    .h-user-avatar img {
+        border-radius: 50%;
+        width: 40px;
+        height: 40px;
+    }
+
+    .h-user-name {
+        margin: 0 10px;
+    }
+}
+
+body {
+    margin: 0;
+    padding: 0;
+    overflow: hidden;
+}

demo3/src/main/resources/static/css/login.css

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+body {
+    background-color: #f8f9fa;
+}
+
+.card {
+    border-radius: 10px;
+    border: none;
+}
+
+.card-title {
+    color: #495057;
+    font-weight: 600;
+}
+
+.btn-primary {
+    background-color: #0d6efd;
+    border: none;
+    padding: 10px;
+}
+
+.btn-primary:hover {
+    background-color: #0b5ed7;
+}
+
+.form-control {
+    padding: 12px;
+    border-radius: 5px;
+}
+
+.form-control:focus {
+    border-color: #86b7fe;
+    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
+}
+
+.alert {
+    border-radius: 5px;
+    padding: 10px 15px;
+}

demo3/src/main/resources/templates/common/header.html

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+<!DOCTYPE html>
+<html lang="en">
+<body>
+<div class="h-container">
+    <svg class="h-icon-menu h-icon-menu-show" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg">
+        <path d="M11.776 899.072h1000.96v59.904H11.776zM12.8 65.024H1013.76v59.904H12.8zM10.24 473.088h636.416v59.904H10.24zM765.44 728.064l244.224-229.888-244.224-229.888z"></path>
+    </svg>
+    <svg class="h-icon-menu h-icon-menu-hide" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg">
+        <path d="M11.264 64.512h1001.472v59.904H11.264zM10.24 899.072h1001.472v59.904H10.24zM376.32 490.496h636.928v59.904H376.32zM258.56 295.424l-244.736 230.4 244.736 229.888z"></path>
+    </svg>
+    <div class="h-sys-name">超级管理系统</div>
+    <div class="h-right-container">
+        <div class="h-notice">
+            <svg class="h-icon-menu" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg">
+                <path d="M512 42.666667c63.637333 0 116.288 50.432 120.682667 114.005333 103.125333 46.058667 175.552 149.12 175.552 269.696v203.306667C867.477333 677.952 896 741.525333 896 820.458667c0 17.557333-15.36 32.896-32.917333 32.896H640l-0.085333 4.8A128 128 0 0 1 384 853.333333L160.917333 853.333333C143.36 853.333333 128 837.973333 128 820.437333c0-76.736 28.522667-142.506667 87.765333-190.741333v-203.306667c0-120.618667 72.426667-223.658667 175.552-269.717333C395.712 93.098667 448.362667 42.666667 512 42.666667z m64 810.688L448 853.333333l0.106667 3.754667A64 64 0 0 0 576 853.354667zM512 106.666667c-29.525333 0-54.741333 23.914667-56.832 54.421333l-2.645333 38.357333-35.114667 15.68c-83.072 37.077333-137.642667 119.104-137.642667 211.242667v233.749333l-23.594666 19.2c-35.136 28.608-55.744 65.173333-62.08 110.016h635.904l-1.066667-7.082666c-7.210667-41.962667-27.2-75.306667-61.098667-102.933334l-23.594666-19.2V426.368c0-92.16-54.570667-174.165333-137.642667-211.242667l-35.114667-15.68-2.645333-38.357333C566.741333 130.581333 541.525333 106.666667 512 106.666667z"></path>
+            </svg>
+        </div>
+        <div class="h-user-info">
+            <div class="h-user-name">maxiaofeng</div>
+            <div class="h-user-avatar">
+                <img src="https://picsum.photos/id/237/200/200" alt="">
+            </div>
+        </div>
+    </div>
+</div>
+</body>
+</html>

demo3/src/main/resources/templates/common/menu.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Title</title>
+</head>
+<body>
+
+</body>
+</html>

demo3/src/main/resources/templates/index.html

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+<!DOCTYPE html>
+<html xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout">
+<head>
+    <meta charset="UTF-8">
+    <title layout:title-pattern="${contentTitle} - 我的应用">首页</title>
+    <link rel="stylesheet" th:href="@{/css/common/main.css}" href="../static/css/common/main.css">
+
+</head>
+<body>
+<div class="ui-menu" layout:insert="~{common/menu}">
+
+</div>
+<div class="ui-main-container">
+    <header class="ui-header">
+        <div layout:insert="~{common/header}">
+            <svg class="h-icon-menu h-icon-menu-hide" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg">
+                <path d="M11.264 64.512h1001.472v59.904H11.264zM10.24 899.072h1001.472v59.904H10.24zM376.32 490.496h636.928v59.904H376.32zM258.56 295.424l-244.736 230.4 244.736 229.888z"></path>
+            </svg>
+            <svg class="h-icon-menu h-icon-menu-show" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg">
+                <path d="M11.776 899.072h1000.96v59.904H11.776zM12.8 65.024H1013.76v59.904H12.8zM10.24 473.088h636.416v59.904H10.24zM765.44 728.064l244.224-229.888-244.224-229.888z"></path>
+            </svg>
+        </div>
+    </header>
+    <div class="ui-content" layout:fragment="content">
+    </div>
+</div>
+</body>
+<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
+<script>$(document).ready(function () {
+  const $menu = $('.ui-menu');
+  const $mainContainer = $('.ui-main-container');
+  const $iconHide = $('.h-icon-menu-hide');
+  const $iconShow = $('.h-icon-menu-show');
+
+  // 初始状态：菜单显示
+  let isMenuVisible = true;
+
+  function updateLayout() {
+    if (isMenuVisible) {
+      $menu.css('width', '200px');
+      $mainContainer.css({
+        'margin-left': '200px',
+        'width': 'calc(100% - 200px)'
+      });
+    } else {
+      $menu.css('width', '0');
+      $mainContainer.css({
+        'margin-left': '0',
+        'width': '100%'
+      });
+    }
+  }
+
+  // 点击 hide 图标：隐藏菜单
+  $iconHide.on('click', function () {
+    isMenuVisible = false;
+    updateLayout();
+    $iconHide.hide();
+    $iconShow.show();
+  });
+
+  // 点击 show 图标：显示菜单
+  $iconShow.on('click', function () {
+    isMenuVisible = true;
+    updateLayout();
+    $iconShow.hide();
+    $iconHide.show();
+  });
+});
+</script>
+</html>

demo3/src/main/resources/templates/login.html

@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org"
+      xmlns:sec="http://www.thymeleaf.org/extras/spring-security">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>登录 - 我的应用</title>
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">
+    <link th:href="@{/css/login.css}" rel="stylesheet">
+</head>
+<body class="bg-light">
+<div class="container">
+    <div class="row justify-content-center mt-5">
+        <div class="col-md-6 col-lg-4">
+            <div class="card shadow-sm">
+                <div class="card-body p-4">
+                    <div class="text-center mb-4">
+                        <h2 class="card-title">用户登录</h2>
+                    </div>
+
+                    <!-- 错误消息 -->
+                    <div th:if="${error}" class="alert alert-danger" role="alert">
+                        <span th:text="${error}"></span>
+                    </div>
+
+                    <!-- 注销消息 -->
+                    <div th:if="${message}" class="alert alert-success" role="alert">
+                        <span th:text="${message}"></span>
+                    </div>
+
+                    <!-- 登录表单 -->
+                    <form th:action="@{/login/postFrom}" method="post">
+                        <div class="mb-3">
+                            <label for="username" class="form-label">用户名</label>
+                            <input type="text" class="form-control" id="username" name="username"
+                                   placeholder="请输入用户名" required autofocus>
+                        </div>
+                        <div class="mb-3">
+                            <label for="password" class="form-label">密码</label>
+                            <input type="password" class="form-control" id="password" name="password"
+                                   placeholder="请输入密码" required>
+                        </div>
+                        <div class="d-grid gap-2 mb-3">
+                            <button type="submit" class="btn btn-primary">登录</button>
+                        </div>
+                        <div class="text-center">
+                            <a th:href="@{/register}" class="text-decoration-none">注册新账户</a>
+                            <span class="mx-2">|</span>
+                            <a href="#" class="text-decoration-none">忘记密码?</a>
+                        </div>
+                    </form>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+
+<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>
+</body>
+</html>

demo3/src/test/java/top/yexuejc/demo/Demo2ApplicationTests.java

@@ -0,0 +1,13 @@
+package top.yexuejc.demo;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class Demo2ApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+
+}