SpringBoot10：首页实现和登录功能实现及拦截器
首页实现
1、在templates目录下新建首页index.html
注意：所有页面的静态资源都需要使用thymeleaf接管
所有的url路径：@{}
<!DOCTYPE html>
<html lang="en-US" 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 th:href="@{/css/bootstrap.min.css}" rel="stylesheet">
<!-- Custom styles for this template -->
<link th:href="@{/css/signin.css}" rel="stylesheet">
</head>
<body class="text-center">
<form class="form-signin" th:action="@{/user/login}">
<img class="mb-4" th:src="@{/img/bootstrap-solid.svg}" alt="" width="72" height="72">
<h1 class="h3 mb-3 font-weight-normal" th:text="#{login.tip}"></h1>
<!-- 如果msg的值为空，则不显示消息-->
<p style="color: red" th:text="${msg}" th:if="${not #strings.isEmpty(msg)}"></p>
<input type="text" name="username" class="form-control" th:placeholder="#{login.username}" required="" autofocus="">
<input type="password" name="password" class="form-control" th:placeholder="#{login.password}" required="">
<div class="checkbox mb-3">
<label>
<input type="checkbox" th:text="#{login.remember}">
</label>
</div>
<button class="btn btn-lg btn-primary btn-block" type="submit" th:text="#{login.btn}"></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>
2、在启动类的同级目录下新建config目录，在config目录下编写MyMvcConfig类，实现WebMvcConfigurer接口的addViewControllers方法，在类上添加@Configuration注释，
package com.edgar.config;
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.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class MyMvcConfig implements WebMvcConfigurer {
@Override
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/").setViewName("index");
registry.addViewController("/index.html").setViewName("index");
}
}
3、测试成功！
请求地址http://localhost:8080/或http://localhost:8080/index.html都会返回首页。
登录功能
1、首页中的form表单的请求地址 /user/login
2、在启动类的同级目录下新建controller目录，在controller目录下编写LoginController类
package com.edgar.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import javax.servlet.http.HttpSession;
@Controller
public class LoginController {
@RequestMapping("/user/login")
public String login(
@RequestParam("username") String username,
@RequestParam("password") String password,
Model model,
HttpSession session) {
// 具体的业务
if (StringUtils.hasLength(username) && "123456".equals(password)) {
return "dashboard"; // 登录成功，跳转至templates目录下的dashboard.html页面
} else {
// 告诉用户，你登陆失败了！
model.addAttribute("msg","用户名或者密码错误！");
return "index";
}
}
}
3、测试成功！
如果登录成功会跳转至 dashboard.html 页面，否也会在首页红字提示 用户名或者密码错误！
拦截器
1、在config目录下新建LoginHandlerInterceptor类实现HandlerInterceptor接口
package com.edgar.config;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginHandlerInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
// 登陆成功之后，应该有用户的 session
Object loginUser = request.getSession().getAttribute("loginUser");
if (loginUser == null) { // 没有登陆
request.setAttribute("msg","没有权限，请先登录");
request.getRequestDispatcher("/index.html").forward(request,response); // 请求转发到首页
return false;
} else {
return true;
}
}
}
2、通过MVC扩展类，将LoginHandlerInterceptor组件注册到Spring容器中
package com.edgar.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class MyMvcConfig implements WebMvcConfigurer {
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new LoginHandlerInterceptor())
.addPathPatterns("/**") // 拦截所有的路径
.excludePathPatterns("/index.html","/","/user/login","/css/**","/img/**","/js/**"); // 排除对配置路径的拦截
}
}
3、测试成功！
除了配置的排除路径以外，如果用户没有登录成功，其它请求路径都会请求转发到首页！
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