Okhttp3-基本用法_综合

前言

Okhttp官网
Okhttp-Github

android网络框架之OKhttp一个处理网络请求的开源项目,是安卓端最火热的轻量级框架,由移动支付Square公司贡献(该公司还贡献了Picasso)

用于替代HttpUrlConnection和Apache HttpClient(android API23 6.0里已移除HttpClient)

官网的解释如下：
Okhttp3-基本用法

基本用法

1.集成

1.1.依赖

   implementation 'com.squareup.okhttp3:okhttp:3.11.0'

可以去Okhttp-Github 查看并依赖最新的版本。

1.2权限

添加网络权限

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

2.使用

2.1 同步GET请求

构建OkHttpClient对象
构建Request对象
构建Call对象并通过execute()方法来执行同步Get请求

 //同步请求OkHttpClient okHttpClient=new OkHttpClient();final Request request=new Request.Builder().url("https://www.wanandroid.com/navi/json").get().build();final Call call = okHttpClient.newCall(request);try {Response response = call.execute();Log.e("同步结果----   ",response.body().string()+"");} catch (IOException e) {e.printStackTrace();}

运行后发现报错：

 android.os.NetworkOnMainThreadException

在Android4.0以后，会发现，只要是写在主线程（就是Activity）中的HTTP请求，运行时都会报错，这是因为Android在4.0以后为了防止应用的ANR（Aplication Not Response）异常。解决方法就是在子线程中运行：

        //同步请求OkHttpClient okHttpClient=new OkHttpClient();final Request request=new Request.Builder().url("https://www.wanandroid.com/navi/json").get().build();final Call call = okHttpClient.newCall(request);new Thread(new Runnable() {@Overridepublic void run() {try {Response response = call.execute();Log.e("同步结果----   ",response.body().string()+"");} catch (IOException e) {e.printStackTrace();}}}).start();

2.2 异步GET请求

   //异步请求OkHttpClient okHttpClient=new OkHttpClient();final Request request=new Request.Builder().url("https://www.wanandroid.com/navi/json").get().build();final Call call = okHttpClient.newCall(request);call.enqueue(new Callback() {@Overridepublic void onFailure(Call call, IOException e) {Log.d("okhttp_error",e.getMessage());}@Overridepublic void onResponse(Call call, Response response) throws IOException {Gson gson=new Gson();Log.d("okhttp_success",response.body().string());}});

2.3 POST请求

POST请求支持提交文件，流，string，表单等等。这里拿POST表单请求作为请求示例：

        OkHttpClient okHttpClient = new OkHttpClient();RequestBody requestBody = new FormBody.Builder().add("username", "qinzishuai").add("password", "111111").build();Request request = new Request.Builder().url("https://www.wanandroid.com/user/login").post(requestBody).build();   okHttpClient.newCall(request).enqueue(new Callback() {@Overridepublic void onFailure(Call call, IOException e) {Log.d("okhttp", "onFailure: " + e.getMessage());}@Overridepublic void onResponse(Call call, Response response) throws IOException {Log.d("okhttp", "onResponse: " + response.body().string());}});

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Okhttp3-基本用法