前言：本篇博客教学大家如何使用okhttp发送同步/异步get请求和同步/异步post请求，这边博主把代码全部亲自测试过了一遍，需要源码的可以在文章最后自行拉取。
目录
一、导入依赖
二、开启外网访问权限
三、发送请求
3.1、发送同步get请求
3.2、发送异步get请求
3.3、发送同步post请求
3.4、发送异步post请求
四、完整代码
4.1、activity_main.xml页面
4.2、MainActivity实体类
五、Gitee源码
一、导入依赖
找到build.gradle文件，在dependencies中添加如下依赖：
implementation 'com.squareup.okhttp3:okhttp:3.5.0'如图所示：
二、开启外网访问权限
找到AndroidManifest.xml文件，添加如下两行代码：
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />如图所示：
三、发送请求
先定义一个全局变量：
private OkHttpClient client = new OkHttpClient();3.1、发送同步get请求
关键代码：
// 发送同步GET请求
new Thread(() -> {Request request = new Request.Builder().url("https://www.httpbin.org/get?key=1&value=2").build();try {Response response = client.newCall(request).execute();String responseData = response.body().string();System.out.println(responseData);// 处理返回的数据} catch (IOException e) {e.printStackTrace();}
}).start();运行结果：
3.2、发送异步get请求
关键代码：
// 发送异步GET请求
Request request = new Request.Builder().url("https://www.httpbin.org/get?key=1&value=2").build();
client.newCall(request).enqueue(new Callback() {@Overridepublic void onFailure(Call call, IOException e) {e.printStackTrace();}@Overridepublic void onResponse(Call call, Response response) throws IOException {String responseData = response.body().string();System.out.println(responseData);// 处理返回的数据}
});运行结果：
3.3、发送同步post请求
关键代码：
// 发送同步POST请求
new Thread(() -> {RequestBody requestBody = new FormBody.Builder()// 添加POST请求参数.add("key","1").add("value","2").build();Request request = new Request.Builder().url("https://www.httpbin.org/post").post(requestBody).build();try {Response response = client.newCall(request).execute();String responseData = response.body().string();System.out.println(responseData);// 处理返回的数据} catch (IOException e) {e.printStackTrace();}
}).start();运行结果：
3.4、发送异步post请求
关键代码：
// 构建JSON数据字符串
String json = "{\"key\": \"1\", \"value\": \"2\"}";
// 创建RequestBody
RequestBody requestBody = RequestBody.create(MediaType.parse("application/json"), json);
Request request = new Request.Builder().url("https://www.httpbin.org/post").post(requestBody).build();
client.newCall(request).enqueue(new Callback() {@Overridepublic void onFailure(Call call, IOException e) {e.printStackTrace();}@Overridepublic void onResponse(Call call, Response response) throws IOException {String responseData = response.body().string();System.out.println(responseData);}
});运行结果：
四、完整代码
4.1、activity_main.xml页面
完整代码：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:padding="16dp"tools:context=".MainActivity"><Buttonandroid:id="@+id/btnSyncGet"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="发送同步GET请求"android:layout_marginTop="20dp"/><Buttonandroid:id="@+id/btnAsyncGet"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="发送异步GET请求"android:layout_below="@id/btnSyncGet"android:layout_marginTop="20dp"/><Buttonandroid:id="@+id/btnSyncPost"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="发送同步POST请求"android:layout_below="@id/btnAsyncGet"android:layout_marginTop="20dp"/><Buttonandroid:id="@+id/btnAsyncPost"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="发送异步POST请求"android:layout_below="@id/btnSyncPost"android:layout_marginTop="20dp"/></RelativeLayout>预览截图：
4.2、MainActivity实体类
完整代码：
package com.example.okhttp;import android.os.Bundle;
import android.widget.Button;import androidx.appcompat.app.AppCompatActivity;import java.io.IOException;import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;public class MainActivity extends AppCompatActivity {private OkHttpClient client = new OkHttpClient();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Button btnSyncGet = findViewById(R.id.btnSyncGet);Button btnAsyncGet = findViewById(R.id.btnAsyncGet);Button btnSyncPost = findViewById(R.id.btnSyncPost);Button btnAsyncPost = findViewById(R.id.btnAsyncPost);btnSyncGet.setOnClickListener(v -> {// 发送同步GET请求new Thread(() -> {Request request = new Request.Builder().url("https://www.httpbin.org/get?key=1&value=2").build();try {Response response = client.newCall(request).execute();String responseData = response.body().string();System.out.println(responseData);// 处理返回的数据} catch (IOException e) {e.printStackTrace();}}).start();});btnAsyncGet.setOnClickListener(v -> {// 发送异步GET请求Request request = new Request.Builder().url("https://www.httpbin.org/get?key=1&value=2").build();client.newCall(request).enqueue(new Callback() {@Overridepublic void onFailure(Call call, IOException e) {e.printStackTrace();}@Overridepublic void onResponse(Call call, Response response) throws IOException {String responseData = response.body().string();System.out.println(responseData);// 处理返回的数据}});});btnSyncPost.setOnClickListener(v -> {// 发送同步POST请求new Thread(() -> {RequestBody requestBody = new FormBody.Builder()// 添加POST请求参数.add("key","1").add("value","2").build();Request request = new Request.Builder().url("https://www.httpbin.org/post").post(requestBody).build();try {Response response = client.newCall(request).execute();String responseData = response.body().string();System.out.println(responseData);// 处理返回的数据} catch (IOException e) {e.printStackTrace();}}).start();});btnAsyncPost.setOnClickListener(v -> {// 构建JSON数据字符串String json = "{\"key\": \"1\", \"value\": \"2\"}";// 创建RequestBodyRequestBody requestBody = RequestBody.create(MediaType.parse("application/json"), json);Request request = new Request.Builder().url("https://www.httpbin.org/post").post(requestBody).build();client.newCall(request).enqueue(new Callback() {@Overridepublic void onFailure(Call call, IOException e) {e.printStackTrace();}@Overridepublic void onResponse(Call call, Response response) throws IOException {String responseData = response.body().string();System.out.println(responseData);}});});}
}五、Gitee源码
源码自取：Android Studio整合okhttp发送同步/异步get和同步/异步post请求
