SpringBoot簡單實現登陸功能
登錄
開發期間模板引擎頁面修改之後，要實時生效css
1）、禁用模板引擎的緩存html
# 禁用緩存 spring.thymeleaf.cache=false
2）、頁面修改完成之後ctrl+f9：從新編譯；java
登錄錯誤消息的顯示web
<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> <!--判斷--> <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層
LoginController:spring
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)){ //登錄成功，防止表單重複提交，能夠重定向到主頁 session.setAttribute("loginUser",username); return "redirect:/main.html"; }else{ //登錄失敗 map.put("msg","用戶名密碼錯誤"); return "login"; } } }
4）、攔截器進行登錄檢查
攔截器bootstrap
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; /** * 登錄檢查， */ public class LoginHandlerInterceptor implements HandlerInterceptor { //目標方法執行以前 @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { Object user = request.getSession().getAttribute("loginUser"); if(user == null){ //未登錄，返回登錄頁面 request.setAttribute("msg","沒有權限請先登錄"); request.getRequestDispatcher("/index.html").forward(request,response); return false; }else{ //已登錄，放行請求 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 { }
}
註冊攔截器：
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能夠來擴展SpringMVC的功能//@EnableWebMvc //不要接管SpringMVC@Configurationpublic class MyMvcConfig extends WebMvcConfigurerAdapter { @Override public void addViewControllers(ViewControllerRegistry registry) { // super.addViewControllers(registry); //瀏覽器發送 /atguigu 請求來到 success registry.addViewController("/atguigu").setViewName("success"); } //全部的WebMvcConfigurerAdapter組件都會一塊兒起做用 @Bean //將組件註冊在容器 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"); } //註冊攔截器 @Override public void addInterceptors(InterceptorRegistry registry) { //super.addInterceptors(registry); //靜態資源； *.css , *.js //SpringBoot已經作好了靜態資源映射 registry.addInterceptor(new LoginHandlerInterceptor()).addPathPatterns("/**") .excludePathPatterns("/index.html","/","/user/login"); } }; return adapter; } @Bean public LocaleResolver localeResolver(){ return new MyLocaleResolver(); }}
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