java實(shí)現(xiàn)從網(wǎng)絡(luò)下載多個文件

//下載
 @RequestMapping("/download01")
 public void downloadImage(String tcLwIds, HttpServletRequest request, HttpServletResponse response) throws Exception{
 boolean dflag = false;
 String[] paths = tcLwIds.split(",");
 File [] file1 = new File[paths.length];
 DownLoadImageUtil imageUtils = new DownLoadImageUtil(); 
 if(paths.length > 1){
 for (int i = 0; i < paths.length; i++) {
 String imagepath=paths[i];
 imageUtils.makeImage(imagepath); //將url的圖片下載到本地,這個方法在下邊
 //修改為圖片存放路徑
 file1[i] = new File("D:/upload/"+imagepath.substring(imagepath.lastIndexOf("/")));
 }
 filesDown(request, response, file1);//這是下邊的一個方法
 }
 }
 
 //將下載到 服務(wù)器 的圖片 放入壓縮包
 public void filesDown(HttpServletRequest request,HttpServletResponse response,File[] file1 ) throws Exception {
 Random r=new Random();
 String tmpFileName =r.nextInt(10000) +"downImage.zip"; 
 String upath=request.getRealPath("/");
 upath=upath.substring(0,upath.length()-1);
 upath=upath.substring(0,upath.lastIndexOf("\\"));
 //服務(wù)地址的存放路徑
 String FilePath = upath+"/ROOT/data/";
 File f=new File(FilePath);
 if(!f.exists()){ //路徑不存在就創(chuàng)建
 FileUtil.createDir(FilePath);
 }
 
  byte[] buffer = new byte[1024]; 
  String strZipPath = FilePath + tmpFileName; //路徑加文件名
  try { 
   ZipOutputStream out = new ZipOutputStream(new FileOutputStream(strZipPath)); 
   for (int i = 0; i < file1.length; i++) { 
    FileInputStream fis = new FileInputStream(file1[i]); 
    out.putNextEntry(new ZipEntry(file1[i].getName())); 
    //設(shè)置壓縮文件內(nèi)的字符編碼，不然會變成亂碼 
    out.setEncoding("GBK"); 
    
    int len; 
    // 讀入需要下載的文件的內(nèi)容，打包到zip文件 
    while ((len = fis.read(buffer)) > 0) { 
     out.write(buffer, 0, len); 
    } 
    out.closeEntry(); 
    fis.close();
   } 
   out.close(); 
   //下載的服務(wù)地址根據(jù)實(shí)際情況修改
   boolean dflag = downloafile(request, response,"http://localhost:8080/data/"+tmpFileName);
   //將服務(wù)器上 壓縮前的源文件 刪除
   for (int i = 0; i < file1.length; i++) { 
 if (file1[i].isFile()) {
  file1[i].delete();
 }
   }
   //將服務(wù)器上的壓縮包刪除
   File fileZip=new File(strZipPath);
   fileZip.delete();
  } catch (Exception e) { 
  e.printStackTrace();
  } 
 } 
 
 //寫到本地
 public boolean downloafile(HttpServletRequest request,HttpServletResponse response, String path) {
 String name = path.substring(path.lastIndexOf("/")+1);
 String filename = DownLoadImageUtil.encodeChineseDownloadFileName(request, name);
 response.setHeader("Content-Disposition", "attachment; filename=" + filename + ";");
 boolean flag = false;
 try {
 URL url = new URL(path);
   InputStream inStream = url.openConnection().getInputStream();
 BufferedInputStream in = new BufferedInputStream(inStream);
 ByteArrayOutputStream out = new ByteArrayOutputStream(1024);
 byte[] temp = new byte[1024];
 int size = 0;
 while ((size = in.read(temp)) != -1) {
 out.write(temp, 0, size);
 }
 in.close();
 ServletOutputStream os = response.getOutputStream();
 os.write(out.toByteArray());
 os.flush();
 os.close();
 flag = true;
 } catch (Exception e) {
 logger.error("違法信息下載...出錯了");
 }
 return flag;
 }

/** 
  * 下載圖片，并按照指定的路徑存儲 
  * @param bean 
  * @param filePath 
  */ 
 public void makeImage( String filePath) { 
  // 網(wǎng)絡(luò)請求所需變量 
  try { 
   //new一個URL對象 
   URL url = new URL(filePath); 
   //打開鏈接 
   HttpURLConnection conn = (HttpURLConnection)url.openConnection(); 
   //設(shè)置請求方式為"GET" 
   conn.setRequestMethod("GET"); 
   //超時響應(yīng)時間為5秒 
   conn.setConnectTimeout(5 * 1000); 
   //通過輸入流獲取圖片數(shù)據(jù) 
   InputStream inStream = conn.getInputStream(); 
   
   ByteArrayOutputStream outStream = new ByteArrayOutputStream(); 
   //創(chuàng)建一個Buffer字符串 
   byte[] buffer = new byte[1024]; 
   //每次讀取的字符串長度，如果為-1，代表全部讀取完畢 
   int len = 0; 
   //使用一個輸入流從buffer里把數(shù)據(jù)讀取出來 
   while( (len=inStream.read(buffer)) != -1 ){ 
    //用輸出流往buffer里寫入數(shù)據(jù)，中間參數(shù)代表從哪個位置開始讀，len代表讀取的長度 
    outStream.write(buffer, 0, len); 
   } 
   byte []data=outStream.toByteArray();
   //先將圖片從url下載到服務(wù)器的D:/upload/
   File imageFile = new File("D:/upload/"+filePath.substring(filePath.lastIndexOf("/"))); 
   //創(chuàng)建輸出流 
   FileOutputStream foutStream = new FileOutputStream(imageFile); 
   foutStream.write(data); 
   //關(guān)閉輸出流 
   foutStream.close();
   inStream.close();
   
  } catch (MalformedURLException e) { 
   e.printStackTrace(); 
  } catch (IOException e) { 
   e.printStackTrace(); 
  } 
 }