OkHttp使用

MainActivity.java

package com.example.myapplication;

import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;

import org.jetbrains.annotations.NotNull;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import okhttp3.Call;
import okhttp3.cookie;
import okhttp3.cookieJar;
import okhttp3.FormBody;
import okhttp3.HttpUrl;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class MainActivity extends AppCompatActivity {
   private Map> cookies = new HashMap<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //注意一定一定一定要把OkHttp请求代码放子线程里面
        new Thread() {
            @Override
            public void run() {
                super.run();
                cookieTest();
            }
        }.start();

    }

    public void cookieTest() {
        OkHttpClient okHttpClient = new OkHttpClient.Builder()
                .cookieJar(new cookieJar() {
                    @Override
                    public void saveFromResponse(@NotNull HttpUrl httpUrl, @NotNull List list) {
                        cookies.put(httpUrl.host(),list);

                    }

                    @NotNull
                    @Override
                    public List loadForRequest(@NotNull HttpUrl httpUrl) {
                        List cookies = MainActivity.this.cookies.get(httpUrl.host());
                        return cookies == null ? new ArrayList<>() : cookies;
                    }
                })
                .build();
        FormBody formBody = new FormBody.Builder().add("username", "用户名")
                .add("password", "密码").build();//密码是自己注册的密码，测试网站https://www.wanandroid.com/
        Request request = new Request.Builder().url("https://www.wanandroid.com/user/login")
                .post(formBody).build();

        //准备好请求的call对象
        Call call = okHttpClient.newCall(request);
        try{
            Response response = call.execute();
             System.out.println(response.body().string());
        }catch (IOException e) {
            e.printStackTrace();
        }
        request = new Request.Builder().url("https://www.wanandroid.com/lg/collect/list/0/json")
                .build();

        //准备好请求的call对象
        call = okHttpClient.newCall(request);
        try{
            Response response = call.execute();
            System.out.println(response.body().string());
        }catch (IOException e) {
            e.printStackTrace();
        }
    }
}

AndroidManiFest.xml

//网络请求权限

build.gradle

implementation 'com.squareup.okhttp3:okhttp:4.2.2'//引入OkHttp的依赖