php curl post请求,java后台用request文件流方式接收

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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.com/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();    }

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