SpringBoot拦截器Filter的使用方法详解
前言：
最新Servlet 3.0拦截器的使用
1.pom.xml添加需要使用的依赖
<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> <!-- 打包的名称 --> <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拦截器
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:拦截的url地址//filterName:拦截器名称@WebFilter(urlPatterns='/api/*', filterName='loginFilter')public class LoginFilter implements Filter{ /* * 容器加载完成调用 * */ @Override public void init(FilterConfig filterConfig) throws ServletException { // TODO Auto-generated method stub System.out.println('filter init...'); } /* * 请求被拦截的时候调用 * */ @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; } } /* * 容器被销毁的时候调用 * */ @Override public void destroy() { // TODO Auto-generated method stub System.out.println('filter destroy...'); } }
3.添加测试控制器
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.添加启动类
package top.ytheng.demo;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.web.servlet.ServletComponentScan;@SpringBootApplication //等于下面3个//@SpringBootConfiguration//@EnableAutoConfiguration//@ComponentScan//拦截器用到@ServletComponentScanpublic class DemoApplication { public static void main(String[] args) { SpringApplication.run(DemoApplication.class, args); } }
5.添加拦截后调整的页面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.右键项目Run As启动项目，测试地址
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内容，希望对大家的学习有所帮助，也希望大家多多支持好吧啦网。
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