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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{
/*
* 容器加載完成調用
* */
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// TODO Auto-generated method stub
System.out.println("filter init...");
}
/*
* 請求被攔截的時候調用
* */
@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;
}
}
/*
* 容器被銷毀的時候調用
* */
@Override
public void destroy() {
// TODO Auto-generated method stub
System.out.println("filter destroy...");
}
}
3.添加測試控制器
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
//@SpringBootConfiguration
//@EnableAutoConfiguration
//@ComponentScan
//攔截器用到
@ServletComponentScan
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
5.添加攔截后調整的頁面filter.html
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <h5>hello theng</h5> <h4>filter success</h4> </body> </html>
6.右鍵項目Run As啟動項目，測試地址
http://localhost:8080/api/v1/filter/test?username=theng http://localhost:8080/api/v1/filter/test?username=ytheng
另附：
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持億速云。
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