登陆
开发期间模板引擎页面修改以后，要实时生效
1）、禁用模板引擎的缓存
# 禁用缓存 spring.thymeleaf.cache=false
2）、页面修改完成以后ctrl+f9：重新编译；
登陆错误消息的显示
<p style="color: red" th:text="${msg}" th:if="${not #strings.isEmpty(msg)}"></p>
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>Signin Template for Bootstrap</title>
<!-- Bootstrap core CSS -->
<link href="asserts/css/bootstrap.min.css" th:href="@{/webjars/bootstrap/4.0.0/css/bootstrap.css}" rel="stylesheet">
<!-- Custom styles for this template -->
<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>
<!--判断-->
<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">© 2017-2018</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>
4）、Controller层
LoginController:
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 {
// @DeleteMapping
// @PutMapping
// @GetMapping
//@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)){
//登陆成功，防止表单重复提交，可以重定向到主页
session.setAttribute("loginUser",username);
return "redirect:/main.html";
}else{
//登陆失败
map.put("msg","用户名密码错误");
return "login";
}
}
}
4）、拦截器进行登陆检查
拦截器
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;
/**
* 登陆检查，
*/
public class LoginHandlerInterceptor implements HandlerInterceptor {
//目标方法执行之前
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
Object user = request.getSession().getAttribute("loginUser");
if(user == null){
//未登陆，返回登陆页面
request.setAttribute("msg","没有权限请先登陆");
request.getRequestDispatcher("/index.html").forward(request,response);
return false;
}else{
//已登陆，放行请求
return true;
}
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
}
}
注册拦截器：
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可以来扩展SpringMVC的功能//@EnableWebMvc //不要接管SpringMVC@Configurationpublic class MyMvcConfig extends WebMvcConfigurerAdapter {
@Override public void addViewControllers(ViewControllerRegistry registry) { // super.addViewControllers(registry); //浏览器发送 /atguigu 请求来到 success registry.addViewController("/atguigu").setViewName("success"); }
//所有的WebMvcConfigurerAdapter组件都会一起起作用 @Bean //将组件注册在容器 public WebMvcConfigurerAdapter webMvcConfigurerAdapter(){ WebMvcConfigurerAdapter adapter = new WebMvcConfigurerAdapter() { @Override public void addViewControllers(ViewControllerRegistry registry) { registry.addViewController("/").setViewName("login"); registry.addViewController("/index.html").setViewName("login"); registry.addViewController("/main.html").setViewName("dashboard"); }
//注册拦截器 @Override public void addInterceptors(InterceptorRegistry registry) { //super.addInterceptors(registry); //静态资源； *.css , *.js //SpringBoot已经做好了静态资源映射 registry.addInterceptor(new LoginHandlerInterceptor()).addPathPatterns("/**") .excludePathPatterns("/index.html","/","/user/login"); } }; return adapter; }
@Bean public LocaleResolver localeResolver(){
return new MyLocaleResolver(); }
}
原文地址：https://www.cnblogs.com/zqLoveSym/p/10570557.html
时间： 2024-10-28 12:38:08