★37.OkHttp

简介

官网

简单示例

0. 引入OkHttp

import okhttp3.*;

1. 创建OkHttpClient

OkHttpClient okHttpClient = new OkHttpClient().newBuilder()
        .readTimeout(10, TimeUnit.SECONDS)
        .connectTimeout(9, TimeUnit.SECONDS)
        .build();

2. 创建Request

final Request request = new Request.Builder()
        .client(okHttpClient)
        .url("https://www.baidu.com/")
        .build();

3. 创建Call

Call call = okHttpClient.newCall(request);

4. 执行Call

异步执行

call.enqueue(new Callback() {
    @Override
    public void onFailure(Call call, IOException e) {
    }

    @Override
    public void onResponse(Call call, Response response) throws IOException {
        String str = response.body().string();
        byte[] bytes = response.body().bytes();
        // 用于下载文件，可以参考Android原生HTTP API，注意处理异常。
        ByteArrayInputStream inputStream = (ByteArrayInputStream) response.body().byteStream();
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                // 更新UI线程控件
            }
        });
    }
});

同步执行

try {
    Response response = call.execute();
} catch (IOException e) {
    e.printStackTrace();
}

POST示例

1. 创建RequestBody

类型一：FormBody

RequestBody body1 = new FormBody.Builder().add("username", "name").build();

类型二：MultipartBody

File file = new File(Environment.getExternalStorageDirectory(), "balabala.mp4");
RequestBody body2 = new MultipartBody.Builder()
        .setType(MultipartBody.FORM)
        .addFormDataPart("name1", "value1")
        // 上传文件
        .addFormDataPart("name2", "filename1", RequestBody.create(MediaType.parse("image/png"), file))
        .addPart(Headers.of( "Content-Disposition", "form-data; name=\"name3\""),
                RequestBody.create(null, "value2"))
        // 上传文件
        .addPart(Headers.of("Content-Disposition", "form-data; name=\"name4\"; filename =\"filename2\""),
                RequestBody.create(MediaType.parse("image/png"), file))
        .build();

2. 创建Request

Request request = new Request.Builder()
        .url("https://www.baidu.com/")
        .post(/* RequestBody */)
        .build();

注意事项

• baseUrl必须以/结尾。
• onResponse()在 UI线程 中，可以更新UI。