前言：

最新Servlet 3.0攔截器的使用

1.pom.xml添加需要使用的依賴

<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> <groupId>top.ytheng</groupId> <artifactId>springboot-demo</artifactId> <version>0.0.1</version> <packaging>jar</packaging> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.5.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.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-thymeleaf</artifactId> </dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <optional>true</optional> <scope>true</scope> </dependency> </dependencies> <build> <!-- 打包的名稱 --> <finalName>myspringboot</finalName> <plugins> <plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId> </plugin> <plugin><artifactId>maven-compiler-plugin</artifactId><configuration> <source>1.8</source> <target>1.8</target></configuration> </plugin> </plugins> </build></project>

2.添加Filter攔截器

package top.ytheng.demo.filter;import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.annotation.WebFilter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;//Servlet3.0特性//urlPatterns:攔截的url地址//filterName:攔截器名稱@WebFilter(urlPatterns='/api/*', filterName='loginFilter')public class LoginFilter implements Filter{ /* * 容器加載完成調(diào)用 * */ @Override public void init(FilterConfig filterConfig) throws ServletException { // TODO Auto-generated method stub System.out.println('filter init...'); } /* * 請(qǐng)求被攔截的時(shí)候調(diào)用 * */ @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { // TODO Auto-generated method stub System.out.println('doFilter...');HttpServletRequest req = (HttpServletRequest)request; HttpServletResponse resp = (HttpServletResponse)response;String username = req.getParameter('username'); if(username.equals('theng')) { chain.doFilter(request, response); } else { //重定向 resp.sendRedirect('/filter.html'); return; } } /* * 容器被銷毀的時(shí)候調(diào)用 * */ @Override public void destroy() { // TODO Auto-generated method stub System.out.println('filter destroy...'); } }

3.添加測(cè)試控制器

package top.ytheng.demo.controller;import java.util.HashMap;import java.util.Map;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestController@RequestMapping('/api/v1/filter')public class FilterController { @RequestMapping('/test') public Object testFilter() { Map<String, Object> map = new HashMap<>(); map.put('name', 'theng'); map.put('pwd', '123456'); return map; }}

4.添加啟動(dòng)類

package top.ytheng.demo;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.web.servlet.ServletComponentScan;@SpringBootApplication //等于下面3個(gè)//@SpringBootConfiguration//@EnableAutoConfiguration//@ComponentScan//攔截器用到@ServletComponentScanpublic class DemoApplication { public static void main(String[] args) { SpringApplication.run(DemoApplication.class, args); } }

5.添加攔截后調(diào)整的頁面filter.html

<!DOCTYPE html><html><head><meta charset='UTF-8'><title>Insert title here</title></head><body> <h4>hello theng</h4> <h3>filter success</h3></body></html>

6.右鍵項(xiàng)目Run As啟動(dòng)項(xiàng)目，測(cè)試地址

http://localhost:8080/api/v1/filter/test?username=thenghttp://localhost:8080/api/v1/filter/test?username=ytheng

另附：

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持好吧啦網(wǎng)。