java编写向接口POST 一个Jason请求，要求 post的方法要单独封装一个类   (有其他类调用post方法，参数最好是json体和链接地址，需要得出返回结果并打印返回信息和http状态码，只打印返回结果和状态码，其他的不能打印出)

 

import java.io.BufferedReader;import java.io.IOException;import java.net.HttpURLConnection;import java.net.URL;import java.io.OutputStreamWriter; import java.io.InputStream;import java.io.InputStreamReader;//import java.net.MalformedURLException;import net.sf.json.JSONObject;//import java.io.InputStreamReader;//import java.io.UnsupportedEncodingException;//import java.io.BufferedReader;//import java.io.DataOutputStream;public class confirmSendJson {         /**      * 发送HttpPost请求      *       * @param strURL      *            服务地址      * @param params      *            json字符串,例如: "{ \"id\":\"12345\" }" ;其中属性名必须带双引号
      * @return 成功:返回json字符串
      */          final static String addr_url = "http://xxxx.com/v1/api/payRequest";      final static String params ="{\"channelCode\": \"01\","    +"\"platformCode\": \"03\","    +"\"tradeNo\": \"1474878291690\","    +"\"subject\": \"打赏\","    +"\"payAmount\": 1,"    +"\"notifyUrl\": \"http://xxxx.com/v1/test/notify\","    +"\"returnUrl\": \"http://xxxx.com/v1/test/notify/sync\","    +"\"expire\": 300,"    +"\"extra\": \"hello world\","    +"\"openId\": \"oSlbct45e-fTbFJOtZvZjV5gNKBE\","    +"\"sign\": \"7BB370F84FD481BC758836BB7919BBEF\"}";    public static String post(String addr_url, String params){        String result="";        BufferedReader in = null;        OutputStreamWriter out=null;        try {            //创建连接            URL url = new URL(addr_url);            HttpURLConnection connection = (HttpURLConnection) url.openConnection();            connection.setDoOutput(true);            connection.setDoInput(true);            connection.setRequestMethod("POST");            connection.setUseCaches(false);//post不能保存缓存            connection.setInstanceFollowRedirects(true);            connection.setRequestProperty("Accept", "application/json"); // 设置接收数据的格式              connection.setRequestProperty("Content-Type", "application/json"); // 设置发送数据的格式             connection.connect();            //POST请求            out = new OutputStreamWriter(                      connection.getOutputStream(), "UTF-8"); // utf-8编码              out.append(params);              out.flush();              out.close();             Map
     
      
       > map = connection.getHeaderFields();           for (String key : map.keySet()){              System.out.println(key + "------>" +map.get(key));           }                        //读取响应            in = new BufferedReader(                    new InputStreamReader(connection.getInputStream()));            String line;            while ((line = in.readLine()) != null) {                result += line;            }        } catch (Exception e) {            System.out.println("发送 POST 请求出现异常！"+e);            e.printStackTrace();        }        //使用finally块来关闭输出流、输入流        finally{            try{                if(out!=null){                    out.close();                }                if(in!=null){                    in.close();                }            }            catch(IOException ex){                ex.printStackTrace();            }        }        return result;       }         public static void main(String[] args) {          String result=null;        result= post(addr_url, params);         System.out.println(result);            }   }