写个filter,让你在哪怕是javabean中都可以随便读取http请求信息

写个filter,让你在哪怕是javabean中都可以随便读取http请求信息

 

package  com.test.web.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.http.HttpServletRequest;
import  javax.servlet.http.HttpServletResponse;
import  javax.servlet.http.HttpSession;

/** */ /**
 * 处理字符转码，提供给Spring AOP或其它任何通过web请求加载的实例类中读取http相关信息
 * @author 裴贺先
 *
 */
public   class  CommonFilter  implements  Filter  ... {
 private FilterConfig config = null;
 private String defaultEncode = "UTF-8";
 private static final String CHARSET_ENCODE_PARAM_NAME="Charset";

 private static ThreadLocal<HttpServletRequest> requests = new ThreadLocal<HttpServletRequest>();
 private static ThreadLocal<HttpServletResponse> responses = new ThreadLocal<HttpServletResponse>();

 public static HttpServletRequest getRequest() ...{
  return (HttpServletRequest) requests.get();
 }

 public static HttpServletResponse getResponse() ...{
  return (HttpServletResponse) responses.get();
 }

 public static HttpSession getSession() ...{
  return (HttpSession) getRequest().getSession();
 }

 public static HttpSession getSession(boolean create) ...{
  return (HttpSession) getRequest().getSession(create);
 }

 public void init(FilterConfig config) throws ServletException ...{
  this.config = config;
  if (this.config.getInitParameter(CHARSET_ENCODE_PARAM_NAME) != null) ...{
   defaultEncode = config.getInitParameter(CHARSET_ENCODE_PARAM_NAME);
  }
 }

 public void doFilter(ServletRequest request, ServletResponse response,
   FilterChain chain) throws IOException, ServletException ...{
  ServletRequest srequest = request;
  srequest.setCharacterEncoding(defaultEncode);
  requests.set((HttpServletRequest) request);
  responses.set((HttpServletResponse) response);
  chain.doFilter(srequest, response);
 }

 public void destroy() ...{
  this.config = null;

 }

}

 

 

 

  < filter >
   < filter-name > Common Filter </ filter-name >
   < filter-class > com.test.web.filter.CommonFilter </ filter-class >
   < init-param >
    < param-name > Charset </ param-name >
    < param-value > UTF-8 </ param-value >
   </ init-param >
  </ filter >

  < filter-mapping >
   < filter-name > Common Filter </ filter-name >
   < url-pattern > /* </ url-pattern >
  </ filter-mapping >


 

 

以后在任何程序中，比如就是普通的javabean中要使用时

 

  logger.debug(CommonFilter.getRequest().getRemoteHost());