Okhttp3-基本用法

前言

Okhttp官網
Okhttp-Github

android網絡框架之OKhttp一個處理網絡請求的開源項目,是安卓端最火熱的輕量級框架,由移動支付Square公司貢獻(該公司還貢獻了Picasso)

用於替代HttpUrlConnection和Apache HttpClient(android API23 6.0裏已移除HttpClient)

官網的解釋如下：

基本用法

1.集成

1.1.依賴

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

可以去Okhttp-Github 查看並依賴最新的版本。

1.2權限

添加網絡權限

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

2.使用

2.1 同步GET請求

• 構建OkHttpClient對象
• 構建Request對象
• 構建Call對象並通過execute()方法來執行同步Get請求

 //同步請求
        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("同步結果----   ",response.body().string()+"");

        } catch (IOException e) {

            e.printStackTrace();

        }

運行後發現報錯：

 android.os.NetworkOnMainThreadException

在Android4.0以後，會發現，只要是寫在主線程（就是Activity）中的HTTP請求，運行時都會報錯，這是因爲Android在4.0以後爲了防止應用的ANR（Aplication Not Response）異常。解決方法就是在子線程中運行：

        //同步請求
        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() {
            @Override
            public void run() {
                try {
                    Response response = call.execute();
                    Log.e("同步結果----   ",response.body().string()+"");

                } catch (IOException e) {

                    e.printStackTrace();

                }
            }
        }).start();

2.2 異步GET請求

   //異步請求
        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() {
            @Override
            public void onFailure(Call call, IOException e) {
                Log.d("okhttp_error",e.getMessage());
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                Gson gson=new Gson();

                Log.d("okhttp_success",response.body().string());
            }
        });

2.3 POST請求

POST請求支持提交文件，流，string，表單等等 。這裏拿POST表單請求作爲請求示例：

        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() {
            @Override
            public void onFailure(Call call, IOException e) {
                Log.d("okhttp", "onFailure: " + e.getMessage());
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {

                Log.d("okhttp", "onResponse: " + response.body().string());
            }
        });

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