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 @ServletComponentScan public 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=theng http://localhost:8080/api/v1/filter/test?username=ytheng
另附:
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