一、环境说明

1、在gradle中引入依赖

    implementation 'com.squareup.okhttp3:okhttp:3.12.1'
    debugImplementation 'com.squareup.okhttp3:logging-interceptor:3.12.1'

2、AndroidManifest中开启网络权限

<uses-permission android:name="android.permission.INTERNET"/>

注意:

在android9.0以后,Android默认禁止使用Http协议，必须使用Https协议，否则会报错误。

所以要使用Http协议的请求必须在AndroidManifest中添加属性,android:usesCleartextTraffic=“true”

3、搭建测试接口

package com.icodingzy.androidback.controller;

import com.icodingzy.androidback.pojo.User;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("user")
public class UserController {
   
    /** * GET NoParameter * @return */
    @GetMapping("getUser")
    public Object getUser() {
   
        User user = new User();
        user.setId((int) (Math.random()*100));
        user.setName("熊顺");
        user.setStudentId("201815110110" + (int) (Math.random()*100));
        user.setSex("男");
        user.setData("Not have Parameter!");
        return user;
    }

    /** * GET TakeParameter * @param id userId * @return */
    @GetMapping("getParamUser")
    public Object getParamUser(Integer id){
   
        User user = new User();
        user.setId(id);
        user.setName("熊顺");
        user.setStudentId("201815110110" + (int) (Math.random()*100));
        user.setSex("男");
        user.setData("parameter is " + id);
        return user;
    }
    /** * Post NoParameter * @return */
    @PostMapping("postNoParamUser")
    public Object postNoParamUser(){
   
        User user = new User();
        user.setId((int) (Math.random()*100));
        user.setName("熊顺");
        user.setStudentId("201815110110" + (int) (Math.random()*100));
        user.setSex("男");
        user.setData("Not have parameter");
        return user;
    }
    /** * Post TakeParameter * @param id userId * @return */
    @PostMapping("postParamUser")
    public Object postParamUser(Integer id){
   
        User user = new User();
        user.setId(id);
        user.setName("熊顺");
        user.setStudentId("201815110110" + (int) (Math.random()*100));
        user.setSex("男");
        user.setData("parameter is " + id);
        return user;
    }
    /** * Post ObjectParameter * @return */
    @PostMapping("postObjectParamUser")
    public Object postObjectParamUser(@RequestBody User user){
   
        return user;
    }
}

接口文档

4、编写OkHttp工具类

package com.zhuoyue.travelwh.OkHttpUtil;


import android.app.ProgressDialog;
import android.content.Context;
import android.util.Log;


import com.zhuoyue.travelwh.bean.MsgBean;

import org.greenrobot.eventbus.EventBus;

import java.io.IOException;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class OkHttpUtil {
   
    public static ProgressDialog dialog;

    /** * 发送网络请求 * @param url 请求Url * @param context 上下文对象 * @param body 请求体，如果有请求体则发送Post请求，反之发送Get请求 */
    public static void getHttpRequset(String url, Context context, RequestBody body) {
   
        startDialog(context);
        OkHttpClient client = new OkHttpClient();

        Request request = null;
        
            //Post请求
        if (body != null) {
   
            request = new Request.Builder()
                    .url(url)
                    .post(body)
                    .build();
        } else {
   
        //Get请求
            request = new Request.Builder()
                    .url(url)
                    .get()
                    .build();
        }

        client.newCall(request).enqueue(new Callback() {
   
            /*请求失败时的回调*/
            @Override
            public void onFailure(Call call, IOException e) {
   
                stopDialog();
                Log.e("onFailure: ", e.getMessage());
            }
            /*请求成功时的回调*/
            @Override
            public void onResponse(Call call, Response response) throws IOException {
   
                stopDialog();
                Log.e("ApiData:", response.body().string());
            }
        });
    }

    /** * 显示等待框 * @param context */
    public static void startDialog(Context context) {
   
        dialog = new ProgressDialog(context);
        dialog.setMessage("数据加载。。。");
        dialog.setTitle("请稍后");
        dialog.setCanceledOnTouchOutside(false);
        dialog.show();
    }

    /** * 关闭等待框 */
    public static void stopDialog() {
   
        if (dialog != null) {
   

            dialog.dismiss();
        }
    }
}

二、发送请求

1.发送无参的Get请求

在自己的业务中使用工具类发送网络请求

	//无参接口
   private final String url = "http://xxxxxx/user/getParamUser";
      @Override
    protected void onCreate(Bundle savedInstanceState) {
   
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        OkHttpUtil.getHttpRequset(url,this,null);
    }

打印结果如下
E/ApiData:: {“id”:82,“name”:“熊顺”,“studentId”:“20181511011066”,“sex”:“男”,“data”:“Not have Parameter!”}

2.发送有参的Get请求

OkHttp发送Get请求时，请求参数全部放在url中

//有参Get接口
   private final String url = "http://xxxxxx/user/getParamUser";
      @Override
    protected void onCreate(Bundle savedInstanceState) {
   
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        OkHttpUtil.getHttpRequset(url + "?id=9999",this,null);
    }

3.发送无参Post请求

发送Post请求时必需要带上请求体

//无参Post接口
   private final String url = "http://xxxxxx/user/postNoParamUser";
      @Override
    protected void onCreate(Bundle savedInstanceState) {
   
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        RequestBody body = new FormBody.Builder()
                        .build();
                OkHttpUtil.getHttpRequset(url, this, body);
    }

4.发送有参Pos请求

add中固定为String类型

//有参Post接口
   private final String url = "http://xxxxxx/user/postParamUser";
      @Override
    protected void onCreate(Bundle savedInstanceState) {
   
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        RequestBody body = new FormBody.Builder()
                        .add("id","8888")
                        .build();
                OkHttpUtil.getHttpRequset(url, this, body);
    }

5.发送Post 的Json数据

发送Json数据需要借助JSONObject，把数据转换成Json格式

//Json化参数Post接口
   private final String url = "http://xxxxxx/user/postObjectParamUser";
      @Override
    protected void onCreate(Bundle savedInstanceState) {
   
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        JSONObject jsonObject = new JSONObject();
                try {
   
                    jsonObject.put("id",1111111);
                    jsonObject.put("name","顺");
                    jsonObject.put("studentId","123123");
                    jsonObject.put("sex","小萌新");
                    jsonObject.put("data","I have pan");
                } catch (JSONException e) {
   
                    e.printStackTrace();
                }
                RequestBody body = FormBody.create(MediaType.parse("application/json;charset=utf-8"), jsonObject.toString());

                OkHttpUtil.getHttpRequset(url, this, body);
    }