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Spring Boot中防表单重复提交以及拦截器登录检测

發布時間：2025/3/15 javascript 19 豆豆

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理論

演示

源碼

?

理論

在用戶登錄后，如果按F5刷新會出現表單重復提交的問題，解決這個問題后，如果沒有攔截器登錄檢測，就會造成，任意用戶可以登錄后臺界面，所以要有攔截器登錄檢測。

相關的邏輯步驟：

? ? ? ? ? 1.?通過視圖映射。把用戶登錄成功的界面重定向到success的界面；

? ? ? ? ? 2. 創建一個HandlerInterceptor的子類，用于攔截設置；

? ? ? ? ? 3. 在WebMvcConfigurerAdapter的子類中，設置攔截器，以及放行該放行的請求；

演示

未登錄的用戶直接登錄后臺界面：

輸入用戶密碼登錄后！

按下F5也不會出現表單重復提交的問題！

源碼

程序結構如下：

源碼如下：

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;/**** 登錄檢測*/ public class LoginHandlerInterceptor implements HandlerInterceptor {//目標方法執行以前@Overridepublic boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {Object user = httpServletRequest.getSession().getAttribute("loginUser");if(user == null){//未登錄返回登錄界面httpServletRequest.setAttribute("msg", "沒有權限請先登錄");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組建都會其作用@Bean //將組建注冊到容器中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");}//注冊攔截器@Overridepublic void addInterceptors(InterceptorRegistry registry) {//Spring Boot中已經做好靜態資源映射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)){//防止表單重復提交，可以重定向到主頁//return "success";session.setAttribute("loginUser", username);return "redirect:/main.html";}map.put("msg", "用戶名密碼錯誤");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>用戶名：<input name="username" type="text" placeholder="userName"></p><p>密碼：<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/> </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><dependency><groupId>org.webjars</groupId><artifactId>jquery</artifactId><version>3.3.1</version></dependency><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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