Spring Boot 之FilterRegistrationBean  --支持web Filter 排序的使用

Spring 提供了FilterRegistrationBean类，此类提供setOrder方法，可以为filter设置排序值，

让spring在注册web filter之前排序后再依次注册。

  写一个普通的filter：

package com.sdcuike.practice.web2;import java.io.IOException;import javax.annotation.Resource;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 org.slf4j.Logger;import org.slf4j.LoggerFactory;import com.sdcuike.practice.config.CommonConfig;public class FilterDemo3 implements Filter {    private final Logger log = LoggerFactory.getLogger(getClass());    @Resource    private CommonConfig commonConfig;    @Override    public void destroy() {        log.info("" + getClass() + " destroy");    }    @Override    public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException {        log.info("" + getClass() + " doFilter " + commonConfig);        arg2.doFilter(arg0, arg1);    }    @Override    public void init(FilterConfig arg0) throws ServletException {        log.info("" + getClass() + " init");    }}

配置如下：

package com.sdcuike.practice.web2;import javax.servlet.Filter;import org.springframework.boot.web.servlet.FilterRegistrationBean;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import com.sdcuike.spring.extend.web.MvcConfigurerAdapter;/** * web 组件配置 *  * @author sdcuike *         <p> *         Created on 2017-02-10 *         <p> *         自定义注入，并支持依赖注入，组件排序 */@Configurationpublic class WebComponent2Config   {    @Bean    public FilterRegistrationBean filterDemo3Registration() {        FilterRegistrationBean registration = new FilterRegistrationBean();        registration.setFilter(filterDemo3());        registration.addUrlPatterns("/*");        registration.addInitParameter("paramName", "paramValue");        registration.setName("filterDemo3");        registration.setOrder(6);        return registration;    }    @Bean    public FilterRegistrationBean filterDemo4Registration() {        FilterRegistrationBean registration = new FilterRegistrationBean();        registration.setFilter(filterDemo4());        registration.addUrlPatterns("/*");        registration.addInitParameter("paramName", "paramValue");        registration.setName("filterDemo4");        registration.setOrder(7);        return registration;    }    @Bean    public Filter filterDemo3() {        return new FilterDemo3();    }    @Bean    public Filter filterDemo4() {        return new FilterDemo4();    }}

利用这种方式，我们可以对filter排序，可自行测试，源码:

https://github.com/sdcuike/spring-boot-practice/tree/master/src/main/java/com/sdcuike/practice/web2

<spring-boot.version>1.5.1.RELEASE</spring-boot.version>