java³£ÓÃÀà blobFileBean

package com.whlongyi.sys.blob.bean;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import javax.faces.context.FacesContext;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.myfaces.custom.fileupload.UploadedFile;
import com.whlongyi.common.util.FacesUtils;
import com.whlongyi.sys.blob.bo.BlobFile;
import com.whlongyi.sys.blob.service.BlobFileService;
public class BlobFileBean {
 
 public final static String uploadPath="uploadFile";
 
 private BlobFileService blobFileService;
 public BlobFileService getBlobFileService() {
  return blobFileService;
 }
 public void setBlobFileService(BlobFileService blobFileService) {
  this.blobFileService = blobFileService;
 }
 
 public String downLoadFile()
 {
  String blobId=FacesUtils.getRequestParameter("blobFileID");
  BlobFile blobVO=blobFileService.getBlobFile(Integer.parseInt(blobId));
  HttpServletResponse response = (HttpServletResponse) FacesContext.getCurrentInstance().getExternalContext().getResponse();
  ServletContext servletContext=FacesUtils.getServletContext();
        InputStream s = new java.io.ByteArrayInputStream(blobVO.getFileContent());
        BufferedInputStream bis =  new BufferedInputStream(s);
        String realName=blobVO.getName();
        String extendName=null;
        try {