Android 以Json格式发送Post服务请求

package com.example.msh.utils;

import android.text.TextUtils;
import android.util.Log;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/*服务请求帮助类
Author ：William(徐威)
Create Time：2018-07-21*/
public class HttpHelper {
    private static String apiUrl = "http://192.168.0.102/Eson.Store.Host/";

    public static String sendJsonPost(String Json, String method) {
        // HttpClient 6.0被抛弃了
        String result = "";
        BufferedReader reader = null;
        try {
            String urlPath = apiUrl + method;
            URL url = new URL(urlPath);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setUseCaches(false);
            conn.setRequestProperty("Connection", "Keep-Alive");
            conn.setRequestProperty("Charset", "UTF-8");
            // 设置文件类型:
            conn.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
            // 设置接收类型否则返回415错误
            //conn.setRequestProperty("accept","*/*")此处为暴力方法设置接受所有类型，以此来防范返回415;
            conn.setRequestProperty("accept", "application/json");
            // 往服务器里面发送数据
            if (Json != null && !TextUtils.isEmpty(Json)) {
                byte[] writebytes = Json.getBytes();
                // 设置文件长度
                conn.setRequestProperty("Content-Length", String.valueOf(writebytes.length));
                OutputStream outwritestream = conn.getOutputStream();
                outwritestream.write(Json.getBytes());
                outwritestream.flush();
                outwritestream.close();
                Log.d("hlhupload", "doJsonPost: conn" + conn.getResponseCode());
            }
            if (conn.getResponseCode() == 200) {
                reader = new BufferedReader(
                        new InputStreamReader(conn.getInputStream()));
                result = reader.readLine();
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return result;
    }
}