java请求PHP接口

/**

* 请求PHP接口
* @param pathUrl 接口地址
* @param params 请求参数
* @return httpUrlConnection
*/
public  String httpUrlConnection(String pathUrl, String params) {   
   try {     
   // 建立连接   
   URL url = new URL(pathUrl);   
   HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();   
     
      
   // //设置连接属性   
   httpConn.setDoOutput(true);// 使用 URL 连接进行输出   
   httpConn.setDoInput(true);// 使用 URL 连接进行输入   
   httpConn.setUseCaches(false);// 忽略缓存   
   httpConn.setRequestMethod("POST");// 设置URL请求方法   
   String requestString = "param="+params;   
     
   // 设置请求属性   
   // 获得数据字节数据，请求数据流的编码，必须和下面服务器端处理请求流的编码一致   
   byte[] requestStringBytes = requestString.getBytes("UTF-8");   
   httpConn.setRequestProperty("Content-length", "" + requestStringBytes.length);   
   httpConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");   
   httpConn.setRequestProperty("Connection", "Keep-Alive");// 维持长连接   
   httpConn.setRequestProperty("Charset", "UTF-8");   
   //   
   // 建立输出流，并写入数据   
   OutputStream outputStream = httpConn.getOutputStream();   
   outputStream.write(requestStringBytes);   
   outputStream.close();   
   // 获得响应状态   
   int responseCode = httpConn.getResponseCode();   
     
      
   if (HttpURLConnection.HTTP_OK == responseCode) {// 连接成功   
   // 当正确响应时处理数据   
   StringBuffer sb = new StringBuffer();   
   String readLine;   
   BufferedReader responseReader;   
   // 处理响应流，必须与服务器响应流输出的编码一致   
   responseReader = new BufferedReader(new InputStreamReader(httpConn.getInputStream(), "UTF-8"));   
   while ((readLine = responseReader.readLine()) != null) {   
    sb.append(readLine).append("\n");   
   }   
    responseReader.close();   
    System.out.println(sb.toString()); 
    return sb.toString();  
   }   
   } catch (Exception ex) {   
    ex.printStackTrace();   
   }
   return "";
}