使用java的自定义过滤器Filter 处理请求request 并响应response

package com.enation.eop;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Collection;
import java.util.Date;
import java.util.List;
import java.util.Locale;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.enation.eop.processor.back.BackendProcessor;
import com.enation.eop.processor.core.freemarker.FreeMarkerPaser;
import com.enation.eop.processor.facade.FacadeProcessor;
import com.enation.eop.processor.facade.InstallProcessor;
import com.enation.eop.processor.facade.ResourceProcessor;
import com.enation.eop.resource.IAppManager;
import com.enation.eop.resource.model.EopApp;
import com.enation.eop.sdk.context.EopContext;
import com.enation.eop.sdk.context.EopContextIniter;
import com.enation.eop.sdk.context.EopSetting;
import com.enation.framework.context.spring.SpringContextHolder;
import com.enation.framework.context.webcontext.ThreadContextHolder;


public class DispatcherDemoFilter implements Filter {

    public void init(FilterConfig config) {

    }
    
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        
        
//        HttpServletRequest  req= ServletActionContext.getRequest();
//        String  flag= req.getHeader("X-Requested-With");
//            HttpServletResponse   response  = ServletActionContext.getResponse();
        String ip = ((HttpServletRequest) request).getHeader("x-forwarded-for");
        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)){
            ip = ((HttpServletRequest) request).getHeader("Proxy-Client-IP");
        }
        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)){
            ip = ((HttpServletRequest) request).getHeader("WL-Proxy-Client-IP");
        }
        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)){
            ip = request.getRemoteAddr();
        }
        String authtoken = request.getParameter("auth-token");
        System.out.println(authtoken);
        StringBuffer sb = new StringBuffer() ; 
        InputStream is = request.getInputStream(); 
        InputStreamReader isr = new InputStreamReader(is);   
        BufferedReader br = new BufferedReader(isr); 
        String s = "" ; 
        while((s=br.readLine())!=null){ 
            sb.append(s) ; 
        } 
        System.out.println(sb);
        String str =sb.toString(); 
        System.out.println(ip+"时间"+new Date().getTime());
        //response.setCharacterEncoding("utf-8");
        response.setContentType("application/xml");
        String write = "<cart><items><item feed-id=\"449573\" offer-id=\"15\" price=\"825\" count=\"1\" delivery=\"true\"/>" +
                "</items><delivery-options><delivery service-name=\"Курьер\" type=\"DELIVERY\" price=\"1490.00\">" +
                "<dates from-date=\"24-10-2016\" to-date=\"26-10-2016\"/></delivery>" +
                "</delivery-options><payment-methods>" +
                "<payment-method>CASH_ON_DELIVERY</payment-method></payment-methods></cart>";
        System.out.println(write);
        response.getWriter().write(write);
    }

    public void destroy() {

    }
    
    private static boolean isExinclude(String uri) {
        String[] exts = new String[] { "jpg", "gif", "js", "png", "css", "doc", "xls", "swf","ico" }; 
        for (String ext : exts) {
            if (uri.toUpperCase().endsWith(ext.toUpperCase())) {
                return true;
            }
        }
        return false;
    }
    
    
}

web.xml 配置增加

<filter>
    <filter-name>dispatcherDemoFilter</filter-name>
    <filter-class>com.enation.eop.DispatcherDemoFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>dispatcherDemoFilter</filter-name>
    <url-pattern>/demo/*</url-pattern>
  </filter-mapping>
  <filter>

这个配置的意思是过滤/demo/后面的所有请求