SPRing Boot 之web Filter --不支持排序的使用

package com.sdcuike.practice.web;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 javax.servlet.annotation.WebFilter;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.core.annotation.Order;import com.sdcuike.practice.config.CommonConfig;/** * FilterDemo1 *  * @author sdcuike *         <p> *         Created on 2017-02-10 *         <p> *         支持依賴(lài)注入 */@WebFilter("/*")public class FilterDemo1 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");    }}  為了讓spring boot掃描到注解的filter，我們還需要配置：
package com.sdcuike.practice.web;import org.springframework.boot.web.servlet.ServletComponentScan;import org.springframework.context.annotation.Configuration;/** * web 組件配置 *  * @author sdcuike *         <p> *         Created on 2017-02-09 *         <p> *         web組件如Filter等注解配置，支持依賴(lài)注入，但spring的@Order注解不支持排序; * @WebFilter has no element to define the order of filter of execution. */@Configuration@ServletComponentScanpublic class WebComponentConfig {}由于WebComponentConfig的包和filter所在的包同級(jí)目錄（子目錄也可以），注解ServletComponentScan默認(rèn)掃描與配置類(lèi)WebComponentConfig同包及子包下面的filter，我們可以省去包名的書(shū)寫(xiě)。 大家也看到了注解：@WebFilter has no element to define the order of filter of execution.但我們使用filter的時(shí)候必須排序的情況下，就不能用這個(gè)方法了。  有人說(shuō)，我們可以利用注解：@Order如：
@WebFilter("/*")@Order(1)public class FilterDemo2 implements Filter {    private final Logger log = LoggerFactory.getLogger(getClass());  或者實(shí)現(xiàn)spring 的排序接口：Ordered ，如：
package com.sdcuike.practice.web;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 javax.servlet.annotation.WebFilter;import org.springframework.core.Ordered;import com.sdcuike.practice.config.CommonConfig;import lombok.extern.slf4j.Slf4j;@WebFilter("/*")@Slf4jpublic class FilterDemo5 implements Filter, Ordered {    private final int    order = 66;    @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");    }    @Override    public int getOrder() {        return order;    }}對(duì)不起，spring boot不支持。詳見(jiàn)：https://github.com/spring-projects/spring-boot/issues/8276.    由于興趣，我修改了并擴(kuò)展了spring boot的某些方法，可以支持，詳情見(jiàn)以后序列博文，或直接去看源碼。本博客相關(guān)源碼：https://github.com/sdcuike/spring-boot-practice/tree/master/src/main/java/com/sdcuike/practice/web<spring-boot.version>1.5.1.RELEASE</spring-boot.version>