android http通信——HttpURLConntection

Java代码 

String urlpath="http://i2.sinaimg.cn/dy/dsgb/20083.jpg";
    	try {
			URL url=new URL(urlpath);
			
			HttpURLConnection con = (HttpURLConnection) url.openConnection();
			
			con.setConnectTimeout(6000);
			con.setRequestMethod("GET");
			
			if(con.getResponseCode()==200){
				byte[] imagebytes = readStreamtoBytes(con.getInputStream());
				
				File file =new File("pic.jpg");
				
				FileOutputStream fos =new FileOutputStream(file);
				fos.write(imagebytes);
				fos.close();
			}

Java代码

public static byte[] readStreamtoBytes(InputStream instream) throws IOException{
   
    ByteArrayOutputStream outstream =new ByteArrayOutputStream();
   
    int len=-1;
    byte[] b = new byte[1024];
while((len = instream.read(b)) != -1){
   
outstream.write(b, 0, len);
    }
outstream.flush();
outstream.close();
instream.close();

return outstream.toByteArray();
   
    }