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开发期间模板引擎页面修改以后，要实时生效 || 登陆成功，防止表单重复提交，可以重定向||只有登录之后才能访问相关的页面

發布時間：2025/4/16 编程问答 14 豆豆

生活随笔收集整理的這篇文章主要介紹了开发期间模板引擎页面修改以后，要实时生效 || 登陆成功，防止表单重复提交，可以重定向||只有登录之后才能访问相关的页面小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

去除模板引擎的緩存

th:if? 優先級高于??th:text

登陸成功，防止表單重復提交，可以重定向到主頁

只有登錄之后才能訪問相關的頁面

login.html

<!DOCTYPE html> <html lang="en" xmlns:th="http://www.thymeleaf.org"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><meta name="description" content=""><meta name="author" content=""><title>登錄</title><link href="asserts/css/bootstrap.min.css" th:href="@{/webjars/bootstrap/4.0.0/css/bootstrap.css}" rel="stylesheet"><link href="asserts/css/signin.css" th:href="@{/asserts/css/signin.css}" rel="stylesheet"></head><body class="text-center"><form class="form-signin" action="dashboard.html" th:action="@{/user/login}" method="post"><img class="mb-4" th:src="@{/asserts/img/bootstrap-solid.svg}" src="asserts/img/bootstrap-solid.svg" alt="" width="72" height="72"><h1 class="h3 mb-3 font-weight-normal" th:text="#{login.tip}">Please sign in</h1><p style="color: red" th:text="${msg}" th:if="${not #strings.isEmpty(msg)}"></p><label class="sr-only" th:text="#{login.username}">Username</label><input type="text" name="username" class="form-control" placeholder="Username" th:placeholder="#{login.username}" required="" autofocus=""><label class="sr-only" th:text="#{login.password}">Password</label><input type="password" name="password" class="form-control" placeholder="Password" th:placeholder="#{login.password}" required=""><div class="checkbox mb-3"><label><input type="checkbox" value="remember-me"/> [[#{login.remember}]]</label></div><button class="btn btn-lg btn-primary btn-block" type="submit" th:text="#{login.btn}">Sign in</button><p class="mt-5 mb-3 text-muted">? 2019-2020</p><a class="btn btn-sm" th:href="@{/index.html(l='zh_CN')}">中文</a><a class="btn btn-sm" th:href="@{/index.html(l='en_US')}">English</a></form></body></html>

LoginController.java

package com.atguigu.springboot.controller;import org.springframework.stereotype.Controller; import org.springframework.util.StringUtils; import org.springframework.web.bind.annotation.*;import javax.servlet.http.HttpSession; import java.util.Map;@Controller public class LoginController {//@RequestMapping(value = "/user/login",method = RequestMethod.POST)@PostMapping(value = "/user/login")public String login(@RequestParam("username") String username,@RequestParam("password") String password,Map<String,Object> map, HttpSession session){if(!StringUtils.isEmpty(username) && "123456".equals(password)){//登陸檢查，session.setAttribute("loginUser",username);//登陸成功，防止表單重復提交，可以重定向到主頁return "redirect:/main.html";}else{//登陸失敗map.put("msg","用戶名密碼錯誤");return "login";}} }

LoginHandlerInterceptor.java? ? ? 登陸檢查

package com.atguigu.springboot.component;import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;/*** 登陸檢查*/ public class LoginHandlerInterceptor implements HandlerInterceptor {//目標方法執行之前@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {Object user = request.getSession().getAttribute("loginUser");if(user == null){//未登陸，返回登陸頁面request.setAttribute("msg","沒有權限請先登陸");request.getRequestDispatcher("/index.html").forward(request,response);return false;}else{//已登陸，放行請求return true;}}@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {} }

MyMvcConfig.java

package com.atguigu.springboot.config;import com.atguigu.springboot.component.LoginHandlerInterceptor; import com.atguigu.springboot.component.MyLocaleResolver; import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer; import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.LocaleResolver; import org.springframework.web.servlet.config.annotation.EnableWebMvc; import org.springframework.web.servlet.config.annotation.InterceptorRegistry; import org.springframework.web.servlet.config.annotation.ViewControllerRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;//使用WebMvcConfigurerAdapter可以來擴展SpringMVC的功能 //@EnableWebMvc 不要接管SpringMVC @Configuration public class MyMvcConfig extends WebMvcConfigurerAdapter {@Overridepublic void addViewControllers(ViewControllerRegistry registry) {// super.addViewControllers(registry);//瀏覽器發送 /atguigu 請求來到 successregistry.addViewController("/atguigu").setViewName("success");}//所有的WebMvcConfigurerAdapter組件都會一起起作用@Bean //將組件注冊在容器public WebMvcConfigurerAdapter webMvcConfigurerAdapter(){WebMvcConfigurerAdapter adapter = new WebMvcConfigurerAdapter() {@Overridepublic void addViewControllers(ViewControllerRegistry registry) {registry.addViewController("/").setViewName("login");registry.addViewController("/index.html").setViewName("login");registry.addViewController("/main.html").setViewName("dashboard");}//注冊攔截器@Overridepublic void addInterceptors(InterceptorRegistry registry) {//super.addInterceptors(registry);//靜態資源； *.css , *.js//SpringBoot已經做好了靜態資源映射registry.addInterceptor(new LoginHandlerInterceptor()).addPathPatterns("/**").excludePathPatterns("/index.html","/","/user/login");}};return adapter;}@Beanpublic LocaleResolver localeResolver(){return new MyLocaleResolver();}}

直接訪問?http://localhost:8080/crud/main.html? 會出現訪問不了。要先登錄才能訪問?

總結

以上是生活随笔為你收集整理的开发期间模板引擎页面修改以后，要实时生效 || 登陆成功，防止表单重复提交，可以重定向||只有登录之后才能访问相关的页面的全部內容，希望文章能夠幫你解決所遇到的問題。

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