php curl post请求,java后台用request文件流方式接收

php curl请求：

	<?php 
		
				$userid = 'test';
				$key   = 'testkey';
				$sign  = md5($userid.$key);    
				$data='data';
				$data_string=json_encode(array('userid'=>$userid,'sign'=>$sign,'data'=>$data));
				$url = "http://xxx.WWW/quick/test";
				$ch = curl_init($url);
				curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
				curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);//$data JSON类型字符串
				curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
				curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json', 'Content-Length: ' . strlen($data_string)));
				$result = curl_exec($ch);
				echo "<pre>";
				print_r($result);
				echo "</pre>";
				?>

java 后台:

   private static String getRequestStr(HttpServletRequest request) throws Exception {

         StringBuilder sb = new StringBuilder();
            BufferedReader in=new BufferedReader(new InputStreamReader(request.getInputStream(),"UTF-8"));
            String line = null;
            while ((line = in.readLine()) != null) {
                sb.append(line);
            }

        return  sb.toString();
    }