理论

在用户登录后，如果按F5刷新会出现表单重复提交的问题，解决这个问题后，如果没有拦截器登录检测，就会造成，任意用户可以登录后台界面，所以要有拦截器登录检测。

演示

未登录的用户直接登录后台界面：

输入用户密码登录后！

按下F5也不会出现表单重复提交的问题！

源码

程序结构如下：

源码如下：

LoginHandlerInterceptor.java

package firstlogindemo.demo.config;import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/**** 登录检测*/
public class LoginHandlerInterceptor implements HandlerInterceptor {//目标方法执行以前@Overridepublic boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {Object user = httpServletRequest.getSession().getAttribute("loginUser");if(user == null){//未登录返回登录界面httpServletRequest.setAttribute("msg", "没有权限请先登录");httpServletRequest.getRequestDispatcher("index.html").forward(httpServletRequest, httpServletResponse);return false;}return true;}@Overridepublic void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {}@Overridepublic void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {}
}

myMvcConfig.java

package firstlogindemo.demo.config;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;@Configuration
public class MyMvcConfig extends WebMvcConfigurerAdapter {//所有的WebMvcConfigureAdapterregistry组建都会其作用@Bean   //将组建注册到容器中public WebMvcConfigurerAdapter webMvcConfigurerAdapter(){WebMvcConfigurerAdapter adapter = new WebMvcConfigurerAdapter() {@Overridepublic void addViewControllers(ViewControllerRegistry registry) {registry.addViewController("/").setViewName("index");registry.addViewController("index.html").setViewName("index");registry.addViewController("/main.html").setViewName("success");}//注册拦截器@Overridepublic void addInterceptors(InterceptorRegistry registry) {//Spring Boot中已经做好静态资源映射registry.addInterceptor(new LoginHandlerInterceptor()).addPathPatterns("/**").excludePathPatterns("/index.html", "/", "/user/login");}};return adapter;}
}

LoginController.java

package firstlogindemo.demo.controller;import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.thymeleaf.util.StringUtils;import javax.servlet.http.HttpSession;
import java.util.Map;@Controller
public class LoginController {//@DeleteMapping//@PutMapping//@GetMapping//@RequestMapping(value = "/usr/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)){//防止表单重复提交，可以重定向到主页//return "success";session.setAttribute("loginUser", username);return "redirect:/main.html";}map.put("msg", "用户名密码错误");return "index";}
}

index.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body><form th:action="@{/user/login}" method="post"><p style="color: red" th:text="${msg}" th:if="${not #strings.isEmpty(msg)}"></p><p>用户名：<input name="username" type="text" placeholder="userName"></p><p>密  码：<input name="password" type="password" placeholder="Password"></p><button type="submit">提交</button>
</form></body>
</html>

success.html

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body>
<h1>[[${session.loginUser}]]</h1>
<h1>成功</h1></body>
</html>

application.properties

spring.thymeleaf.cache=false

porn.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.19.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.loginWebDemo</groupId><artifactId>demo</artifactId><version>0.0.1-SNAPSHOT</version><name>loginWeb</name><description>Demo project for Spring Boot</description><properties><java.version>1.8</java.version><thymeleaf.version>3.0.9.RELEASE</thymeleaf.version><thymeleaf-layout-dialect.version>2.2.2</thymeleaf-layout-dialect.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-thymeleaf</artifactId></dependency><!--引入jquery-webjar--><dependency><groupId>org.webjars</groupId><artifactId>jquery</artifactId><version>3.3.1</version></dependency><!--引入bootstrap--><dependency><groupId>org.webjars</groupId><artifactId>bootstrap</artifactId><version>4.0.0</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

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Spring Boot中防表单重复提交以及拦截器登录检测

理论

演示

源码

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