Java Streams.copy方法代码示例

import org.apache.commons.fileupload.util.Streams; //导入方法依赖的package包/类
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    ServletFileUpload upload = new ServletFileUpload();

    try{
        FileItemIterator iterator = upload.getItemIterator(request);
        if (iterator.hasNext()) {
            FileItemStream item = iterator.next();
            String name = item.getFieldName();

            logger.debug("Uploading file '{}' with item name '{}'", item.getName(), name);

            InputStream stream = item.openStream();

            ByteArrayOutputStream out = new ByteArrayOutputStream();
            Streams.copy(stream, out, true);

            byte[] data = out.toByteArray();

            response.setStatus(HttpServletResponse.SC_OK);
            response.setContentType("text/html");
            response.setCharacterEncoding("utf-8");
            response.getWriter().print(new String(data));
            response.flushBuffer();
        }
        else {
            logger.error("No file found in post request!");
            throw new RuntimeException("No file found in post request!");
        }
    }
    catch(Exception e){
        logger.error("Unexpected error in FileUploadServlet.doPost: ", e);
        throw new RuntimeException(e);
    }
}
 

import org.apache.commons.fileupload.util.Streams; //导入方法依赖的package包/类
public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
  //CHECKSTYLE:ON
  ServletFileUpload upload = new ServletFileUpload();

  try {
    FileItemIterator iter = upload.getItemIterator(request);
    if (iter.hasNext()) {
      FileItemStream item = iter.next();
      String name = item.getFieldName();

      LOG.debug("Uploading file '{}' with item name '{}'", item.getName(), name);

      InputStream stream = item.openStream();

      // Process the input stream
      ByteArrayOutputStream out = new ByteArrayOutputStream();
      Streams.copy(stream, out, true);

      byte[] data = out.toByteArray();

      cacheService.uploadedFile(name, data);
    } else {
      LOG.error("No file found in post request!");
      throw new RuntimeException("No file found in post request!");
    }
  } catch (Exception ex) {
    LOG.error("Unexpected error in FileUpload.doPost: ", ex);
    throw new RuntimeException(ex);
  }

}
 

import org.apache.commons.fileupload.util.Streams; //导入方法依赖的package包/类
/** 
     * 实现多文件的同时上传 
     */   
    public void doGet(HttpServletRequest request,  
            HttpServletResponse response) throws ServletException, IOException {  
         System.out.println("===========");
        //设置接收的编码格式  
        request.setCharacterEncoding("UTF-8");  
        Date date = new Date();//获取当前时间  
        SimpleDateFormat sdfFileName = new SimpleDateFormat("yyyyMMddHHmmss");  
        SimpleDateFormat sdfFolder = new SimpleDateFormat("yyMM");  
//        String newfileName = sdfFileName.format(date);//文件名称  
        String fileRealPath = "";//文件存放真实地址  
          
        String fileRealResistPath = "";//文件存放真实相对路径  
          
        //名称  界面编码 必须 和request 保存一致..否则乱码  
        String name = request.getParameter("name");  
        String id = request.getParameter("id");  //内容的ID,必须先添加内容，然后才能上传图片
//        String newfileName = name;    
           
        String firstFileName="";  
        // 获得容器中上传文件夹所在的物理路径  
        String savePath = this.getServletConfig().getServletContext().getRealPath("/") + "upload\\" + id +"\\";  
        System.out.println("路径" + savePath+"; name:"+name);  
        File file = new File(savePath);  
        if (!file.isDirectory()) {  
            file.mkdirs();  
        }  
  
        try {  
            DiskFileItemFactory fac = new DiskFileItemFactory();  
            ServletFileUpload upload = new ServletFileUpload(fac);  
            upload.setHeaderEncoding("UTF-8");
//            upload.setFileItemFactory(factory)
            System.out.println("request：＝"+request);
            // 获取多个上传文件  
            List fileList = fileList = upload.parseRequest(request);
            System.out.println("fileList:"+fileList);
            // 遍历上传文件写入磁盘  
            Iterator it = fileList.iterator();  
            while (it.hasNext()) {  
            	Object obit = it.next();
            	if(obit instanceof DiskFileItem){
            		System.out.println("xxxxxxxxxxxxx");
	                DiskFileItem item = (DiskFileItem) obit;  
	                  
	                // 如果item是文件上传表单域     
	                // 获得文件名及路径     
	                String fileName = item.getName();  
	                if (fileName != null) {  
	                    firstFileName=item.getName().substring(item.getName().lastIndexOf("\\")+1);  
	                    String formatName = firstFileName.substring(firstFileName.lastIndexOf("."));//获取文件后缀名  
	                    fileRealPath = savePath + fileName;//+ formatName;//文件存放真实地址  
	                      
	                    BufferedInputStream in = new BufferedInputStream(item.getInputStream());// 获得文件输入流  
	                    BufferedOutputStream outStream = new BufferedOutputStream(new FileOutputStream(new File(fileRealPath)));// 获得文件输出流  
	                    Streams.copy(in, outStream, true);// 开始把文件写到你指定的上传文件夹  
	                    //上传成功，则插入数据库  
	                    if (new File(fileRealPath).exists()) {  
	                        //虚拟路径赋值  
	                        fileRealResistPath=sdfFolder.format(date)+"/"+fileRealPath.substring(fileRealPath.lastIndexOf("\\")+1);  
	                        //保存到数据库  
	                        System.out.println("保存到数据库:");  
	                        System.out.println("name:"+name);  
	                        System.out.println("虚拟路径:"+fileRealResistPath);  
	                    }  
	                       
	                }   
            	}
            }   
        } catch (org.apache.commons.fileupload.FileUploadException ex) {
    	   ex.printStackTrace();  
           System.out.println("没有上传文件");  
           return;  
		}   
       response.getWriter().write("1");  
          
    }
 

import org.apache.commons.fileupload.util.Streams; //导入方法依赖的package包/类
/**
 * <p>Reads <code>body-data</code> from the current
 * <code>encapsulation</code> and writes its contents into the
 * output <code>Stream</code>.
 * <p>
 * <p>Arbitrary large amounts of data can be processed by this
 * method using a constant size buffer. (see {@link
 * #MultipartStream(InputStream, byte[], int,
 * MultipartStreamCopy.ProgressNotifier) constructor}).
 *
 * @param output The <code>Stream</code> to write data into. May
 *               be null, in which case this method is equivalent
 *               to {@link #discardBodyData()}.
 * @return the amount of data written.
 * @throws MalformedStreamException if the stream ends unexpectedly.
 * @throws IOException              if an i/o error occurs.
 */
public int readBodyData(OutputStream output)
        throws MalformedStreamException, IOException {
    final InputStream istream = newInputStream();
    return (int) Streams.copy(istream, output, false);
}
 

import org.apache.commons.fileupload.util.Streams; //导入方法依赖的package包/类
/**
 * <p>Reads <code>body-data</code> from the current
 * <code>encapsulation</code> and writes its contents into the
 * output <code>Stream</code>.
 *
 * <p>Arbitrary large amounts of data can be processed by this
 * method using a constant size buffer. (see {@link
 * #MultipartStream(InputStream,byte[],int,
 *   MultipartStream.ProgressNotifier) constructor}).
 *
 * @param output The <code>Stream</code> to write data into. May
 *               be null, in which case this method is equivalent
 *               to {@link #discardBodyData()}.
 *
 * @return the amount of data written.
 *
 * @throws MalformedStreamException if the stream ends unexpectedly.
 * @throws IOException              if an i/o error occurs.
 */
public int readBodyData(OutputStream output)
        throws MalformedStreamException, IOException {
    final InputStream istream = newInputStream();
    return (int) Streams.copy(istream, output, false);
}
 

import org.apache.commons.fileupload.util.Streams; //导入方法依赖的package包/类
/**
 * <p>Reads <code>body-data</code> from the current
 * <code>encapsulation</code> and writes its contents into the
 * output <code>Stream</code>.
 *
 * <p>Arbitrary large amounts of data can be processed by this
 * method using a constant size buffer. (see {@link
 * #MultipartStream(InputStream,byte[],int, ProgressNotifier) constructor}).
 *
 * @param output The <code>Stream</code> to write data into. May
 *               be null, in which case this method is equivalent
 *               to {@link #discardBodyData()}.
 *
 * @return the amount of data written.
 *
 * @throws MalformedStreamException if the stream ends unexpectedly.
 * @throws IOException              if an i/o error occurs.
 */
public int readBodyData(OutputStream output)
        throws MalformedStreamException, IOException {
    final InputStream istream = newInputStream();
    return (int) Streams.copy(istream, output, false);
}