003_SpringBoot整合Filter-优快云博客

1. 通过注解扫描完成Filter组件的注册(SpringBoot整合Filter方式一)

1.1. 使用maven构建SpringBoot的名叫spring-boot-filter项目

1.2. pom.xml

<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>com.bjbs</groupId>
	<artifactId>spring-boot-filter</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.13.RELEASE</version>
	</parent>

	<!-- 修改jdk版本 -->
	<properties>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<!-- springBoot的启动器 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
	</dependencies>
</project>

1.3. 编写FirstFilter.java

package com.bjbs1.controller;

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;

/**
 * SpringBoot整合Filter方式一 
 * 
 * <filter> 
 * 	<filter-name>FirstFilter</filter-name>
 * 	<filter-class>com.bjsxt1.filter.FirstFilter</filter-class> 
 * </filter>
 * 
 * <filter-mapping> 
 * 	<filter-name>FirstFilter</filter-name>
 * 	<url-pattern>/first</url-pattern> 
 * </filter-mapping>
 */

// @WebFilter(filterName="FirstFilter",urlPatterns={"*.do","*.jsp"})
@WebFilter(filterName = "FirstFilter", urlPatterns = "/first")
public class FirstFilter implements Filter {
	@Override
	public void destroy() {

	}

	@Override
	public void doFilter(ServletRequest req, ServletResponse res, FilterChain ch) throws IOException, ServletException {
		System.out.println("进入FirstFilter");
		ch.doFilter(req, res);
		System.out.println("离开FirstFilter");
	}

	@Override
	public void init(FilterConfig cf) throws ServletException {

	}
}

1.4. @WebFilter注解

1.5. 编写App.java启动类

package com.bjbs1;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;

/**
 * SpringBoot整合Filter方式一, SpringBoot启动类
 */
@SpringBootApplication
@ServletComponentScan // 在springBoot启动时会扫描@WebFilter, 并将该类实例化
public class App {
	public static void main(String[] args) {
		SpringApplication.run(App.class, args);
	}
}

1.6. 配置@ServletComponentScan注解, 在SpringBoot启动时会扫描@WebFilter, 并将该类实例化

1.7. 运行项目, 并用浏览器访问FirstFilter

2. 通过方法完成Filter组件的注册(SpringBoot整合Filter方式二)

2.1. 编写SecondFilter.java

package com.bjbs2.controller;

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;

/**
 * SpringBoot整合Filter方式二
 */
public class SecondFilter implements Filter {
	@Override
	public void destroy() {
	}

	@Override
	public void doFilter(ServletRequest req, ServletResponse res, FilterChain ch) throws IOException, ServletException {
		System.out.println("进入SecondFilter");
		ch.doFilter(req, res);
		System.out.println("离开SecondFilter");
	}

	@Override
	public void init(FilterConfig cf) throws ServletException {

	}
}

2.2. 编写App2.java启动类

package com.bjbs2;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import com.bjbs2.controller.SecondFilter;

/**
 * SpringBoot整合Filter方式二, SpringBoot启动类
 */
@SpringBootApplication
public class App2 {
	public static void main(String[] args) {
		SpringApplication.run(App2.class, args);
	}

	/**
	 * 注册Filter
	 */
	@Bean
	public FilterRegistrationBean getFilterRegistrationBean() {
		FilterRegistrationBean bean = new FilterRegistrationBean(new SecondFilter());
		// bean.addUrlPatterns(new String[]{"*.do","*.jsp"});
		bean.addUrlPatterns("/second");
		return bean;
	}
}

2.3. 使用org.springframework.boot.web.servlet.FilterRegistrationBean类注册Filter