uploadfilter.java

java实现的透明信息上传组件

package test;

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;

public class UploadFilter implements Filter {

	public void destroy() {
		// TODO Auto-generated method stub

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		
		HttpServletRequest req=(HttpServletRequest)request;
		String type=req.getHeader("Content-Type");
		if(type==null||!type.startsWith("multipart/form-data")){
			
			chain.doFilter(request, response);
			
		}
		else{
			
			MultipartRequest mreq=null;
			try{
			mreq=new MultipartRequest(req);
			}catch(Exception e){
				
			  throw new ServletException(e);
			  
			}
			chain.doFilter(mreq,response);
			
			}
		
		}

	public void init(FilterConfig arg0) throws ServletException {
		

	}

}