package com.cn.controller;



import com.alibaba.fastjson.JSONObject;
import okhttp3.*;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

public class getUser {

    public static void main(String[] args) throws Exception {
        getByOKHTTP();
    }


    public static  void getByOKHTTP() throws IOException{

        String url = "";
        OkHttpClient client = new OkHttpClient();
        MediaType mediaType = MediaType.parse("application/json");

        //設定引數
        Map<String,String> map = new HashMap<String,String>();
        map.put("code","");
        map.put("name","");
        String content =JSONObject.toJSON(map).toString();
        RequestBody body = RequestBody.create(mediaType,content);
        Request request = new Request.Builder()
                .url(url)
                .post(body)
                .addHeader("Content-Type", "application/json")
                .build();

        try {
           Response response = client.newCall(request).execute();
            
           //直接獲取返回的資料
           String result = response.body().string();
           System.out.println(result);

        }catch (Exception e){
            e.printStackTrace();
        }

    }
}
 

根據介面的返回值型別問題,可能會出現 response.body().string()獲取資料時異常. 可以先獲取responseBody.byteStream(),再把流轉成string

 public static  void getByOKHTTP() throws IOException{

        String url = "";
        OkHttpClient client = new OkHttpClient();
        MediaType mediaType = MediaType.parse("application/json");

        Map<String,String> map = new HashMap<String,String>();
        map.put("code","");
        map.put("name","");
   
        String content =JSONObject.toJSON(map).toString();
        RequestBody body = RequestBody.create(mediaType,content);
        Request request = new Request.Builder()
                .url(url)
                .post(body)
                .addHeader("Content-Type", "application/json")
                .build();

        try {
           Response response = client.newCall(request).execute();
           ResponseBody responseBody  =response.body();
           InputStream inputStream  = responseBody.byteStream();
           byte[] bytes =   readInputStream(inputStream);
           String data = new String(bytes);

           System.out.println(data);


        }catch (Exception e){
            e.printStackTrace();
        }

    }

    public  static byte[] readInputStream(InputStream inputStream) throws  IOException{
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = 0;
        try {
            while ((len = inputStream.read(buffer)) !=-1){
                outputStream.write(buffer,0,len);
            }
        }catch (IOException e){
//            e.printStackTrace();
        }
        byte[] data = outputStream.toByteArray();
        outputStream.close();
        inputStream.close();
        return data;
    }