HttpURLConnection发送文件

Java代码 

URL url = new URL(   
            "http://**********");   
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();   
            connection.setDoOutput(true);   
            connection.setRequestMethod("POST");   
            connection.setRequestProperty("Content-Type","multipart/form-data; boundary=Bounday---");   
            connection.setRequestProperty("Cache-Control","no-cache");   
               
            java.io.OutputStream os=connection.getOutputStream();   
            OutputStreamWriter osw=new OutputStreamWriter(os);   
            //BufferedWriter bWriter = new BufferedWriter(osw);   
            //发送字符串数据   
             osw.write("字符串数据");   
             osw.flush();   
                       /*发送文件数据该如何实现*/   
                
               
//      接收数据   
            DataInputStream in = new DataInputStream(connection   
                    .getInputStream());   
            byte[] bytes = new byte[2];   
            in.read(bytes);   
            //String result = new String(bytes);   
               
               
            BufferedReader inss = new BufferedReader(new InputStreamReader(connection.getInputStream()));   
             String line = null;   
             StringBuffer content= new StringBuffer();   
            while((line = inss.readLine()) != null){//line为返回值，这就可以判断是否成功、   
                content.append(line);   
            }   
            inss.close() ;   
            inss=null;   
            url=null;  

URL url = new URL(
			"http://**********");
			HttpURLConnection connection = (HttpURLConnection) url.openConnection();
			connection.setDoOutput(true);
			connection.setRequestMethod("POST");
			connection.setRequestProperty("Content-Type","multipart/form-data; boundary=Bounday---");
			connection.setRequestProperty("Cache-Control","no-cache");
			
			java.io.OutputStream os=connection.getOutputStream();
			OutputStreamWriter osw=new OutputStreamWriter(os);
	  		//BufferedWriter bWriter = new BufferedWriter(osw);
	  		//发送字符串数据
	  		 osw.write("字符串数据");
	  		 osw.flush();
                       /*发送文件数据该如何实现*/
	  		 
	  		
//	  	接收数据
	  		DataInputStream in = new DataInputStream(connection
					.getInputStream());
			byte[] bytes = new byte[2];
			in.read(bytes);
			//String result = new String(bytes);
			
			
			BufferedReader inss = new BufferedReader(new InputStreamReader(connection.getInputStream()));
			 String line = null;
			 StringBuffer content= new StringBuffer();
			while((line = inss.readLine()) != null){//line为返回值，这就可以判断是否成功、
				content.append(line);
			}
			inss.close() ;
			inss=null;
			url=null;

服务器端接收数据代码如下
Java代码 

BufferedReader bufferdeReader = request.getReader();   
        StringBuffer sb1 = new StringBuffer();   
        String tempStr = null;   
        while ((tempStr = bufferdeReader.readLine()) != null) {   
            String s = tempStr;   
            sb1.append(s);   
        }