1：自定义过滤器

使用@Component 向spring 容器注入一个bean

package com.dev.filter;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Component;import javax.servlet.*;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.util.*;/** * Created by zgq7 on 2019/6/6. */@Componentpublic class BaseFilter implements Filter {    private static final Logger log = LoggerFactory.getLogger(BaseFilter.class);    @Override    public void init(FilterConfig filterConfig) throws ServletException {        Map
    
      map = new LinkedHashMap<>(10);        map.put("filterName", filterConfig.getFilterName());        log.info("filter config indclude :{}", map);    }    @Override    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {        HttpServletRequest request = (HttpServletRequest) servletRequest;        HttpServletResponse response = (HttpServletResponse) servletResponse;        String uri = request.getRequestURI();        Map
     
       map = new HashMap<>(10);        map.put("url", request.getRequestURL());        map.put("uri", uri);        map.put("requestType", request.getMethod());        log.info("{}", map);        filterChain.doFilter(request, response);    }    @Override    public void destroy() {        log.info("filter destroyed ...");    }}

2：配置类

package com.dev.config;import com.dev.filter.BaseFilter;import org.springframework.boot.web.servlet.FilterRegistrationBean;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import java.util.*;/** * Created by zgq7 on 2019/6/6. */@Configurationpublic class SpringConfig {    @Bean    public FilterRegistrationBean
    
      filterFilterRegistrationBean(BaseFilter baseFilter) {        FilterRegistrationBean
     
       filterFilterRegistrationBean = new FilterRegistrationBean<>();        //拦截路径配置        List
      
        uriList = new ArrayList<>(10);        uriList.add("/dev/*");        filterFilterRegistrationBean.setFilter(baseFilter);        filterFilterRegistrationBean.setEnabled(true);        filterFilterRegistrationBean.setUrlPatterns(uriList);        filterFilterRegistrationBean.setName("baseFilter");        filterFilterRegistrationBean.setOrder(1);        return filterFilterRegistrationBean;    }}

3：测试Controller

package com.dev.controller;import com.google.common.collect.ImmutableMap;import org.springframework.web.bind.annotation.*;import java.util.Map;/** * Created by zgq7 on 2019/6/6. */@RestController@RequestMapping(value = "/dev")public class BaseController {    @GetMapping(value = "")    public Map
    
      get() {        return ImmutableMap.of("code", "get");    }    @PutMapping(value = "t")    public Map
     
       t() {        return ImmutableMap.of("code", "put");    }    @PostMapping(value = "s")    public Map
      
        s() {        return ImmutableMap.of("code", "post");    }}

4：postMan 测试

5：控制台拦截器日志

输出该日志是因为过滤器拦截到了 /dev 路径下的请求才输出的。可自行测试哦~~~

6：这么做的好处

　　①：Filter 是基于Tomcat 容器的，无法访问Spring 容器中的Bean。

　　②：以这种方式向Spring容器中注入Filter 拦截器后，是可以访问到容器中的Bean的。如数据源、某个Service 等。

转载地址：http://nnfwk.baihongyu.com/

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