OkhttpClient的使用

你的名字 2023-10-12 16:07 6阅读 0赞

创建一个OkHttpClient对象需要引入OkHttp库，你可以在以下网址中下载到最新版本的jar包：

[https://mvnrepository.com/artifact/com.squareup.okhttp3/okhttp][https_mvnrepository.com_artifact_com.squareup.okhttp3_okhttp]

当你在项目中引入了OkHttp库后，就可以使用以下代码创建OkHttpClient的对象：

OkHttpClient client = new OkHttpClient();

需要注意的是，OkHttp 3.x版本需要引入`okhttp`、`okio`和`logging-interceptor`三个jar包，你可以在上述网址中下载到这三个jar包的最新版本。同时，OkHttp还支持通过Gradle或Maven等依赖管理工具进行引用。

**异步GET请求**  
\-new OkHttpClient;  
\-构造Request对象；  
\-通过前两步中的对象构建Call对象；  
\-通过Call\#enqueue(Callback)方法来提交异步请求；

String url = "http://wwww.baidu.com";
    OkHttpClient okHttpClient = new OkHttpClient();
    final Request request = new Request.Builder()
            .url(url)
            .get()//默认就是GET请求，可以不写
            .build();
    Call call = okHttpClient.newCall(request);
    call.enqueue(new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
            Log.d(TAG, "onFailure: ");
        }
    
        @Override
        public void onResponse(Call call, Response response) throws IOException {
            Log.d(TAG, "onResponse: " + response.body().string());
        }
    });

**同步GET请求**

String url = "http://wwww.baidu.com";
    OkHttpClient okHttpClient = new OkHttpClient();
    final Request request = new Request.Builder()
            .url(url)
            .build();
    final Call call = okHttpClient.newCall(request);
    new Thread(new Runnable() {
        @Override
        public void run() {
            try {
                Response response = call.execute();
                Log.d(TAG, "run: " + response.body().string());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }).start();

**POST方式提交String**

**POST方式提交流**

RequestBody requestBody = new RequestBody() {
        @Nullable
        @Override
        public MediaType contentType() {
            return MediaType.parse("text/x-markdown; charset=utf-8");
        }
    
        @Override
        public void writeTo(BufferedSink sink) throws IOException {
            sink.writeUtf8("I am Jdqm.");
        }
    };
    
    Request request = new Request.Builder()
            .url("https://api.github.com/markdown/raw")
            .post(requestBody)
            .build();
    OkHttpClient okHttpClient = new OkHttpClient();
    okHttpClient.newCall(request).enqueue(new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
            Log.d(TAG, "onFailure: " + e.getMessage());
        }
    
        @Override
        public void onResponse(Call call, Response response) throws IOException {
            Log.d(TAG, response.protocol() + " " +response.code() + " " + response.message());
            Headers headers = response.headers();
            for (int i = 0; i < headers.size(); i++) {
                Log.d(TAG, headers.name(i) + ":" + headers.value(i));
            }
            Log.d(TAG, "onResponse: " + response.body().string());
        }
    });

**POST提交文件**

MediaType mediaType = MediaType.parse("text/x-markdown; charset=utf-8");
    OkHttpClient okHttpClient = new OkHttpClient();
    File file = new File("test.md");
    Request request = new Request.Builder()
            .url("https://api.github.com/markdown/raw")
            .post(RequestBody.create(mediaType, file))
            .build();
    okHttpClient.newCall(request).enqueue(new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
            Log.d(TAG, "onFailure: " + e.getMessage());
        }
    
        @Override
        public void onResponse(Call call, Response response) throws IOException {
            Log.d(TAG, response.protocol() + " " +response.code() + " " + response.message());
            Headers headers = response.headers();
            for (int i = 0; i < headers.size(); i++) {
                Log.d(TAG, headers.name(i) + ":" + headers.value(i));
            }
            Log.d(TAG, "onResponse: " + response.body().string());
        }
    });

**POST方式提交表单**

OkHttpClient okHttpClient = new OkHttpClient();
    RequestBody requestBody = new FormBody.Builder()
            .add("search", "Jurassic Park")
            .build();
    Request request = new Request.Builder()
            .url("https://en.wikipedia.org/w/index.php")
            .post(requestBody)
            .build();
    
    okHttpClient.newCall(request).enqueue(new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
            Log.d(TAG, "onFailure: " + e.getMessage());
        }
    
        @Override
        public void onResponse(Call call, Response response) throws IOException {
            Log.d(TAG, response.protocol() + " " +response.code() + " " + response.message());
            Headers headers = response.headers();
            for (int i = 0; i < headers.size(); i++) {
                Log.d(TAG, headers.name(i) + ":" + headers.value(i));
            }
            Log.d(TAG, "onResponse: " + response.body().string());
        }
    });

**POST方式提交分块请求**

private static final String IMGUR_CLIENT_ID = "...";
    private static final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/png");
    
    private void postMultipartBody() {
        OkHttpClient client = new OkHttpClient();
    
    
        // Use the imgur image upload API as documented at https://api.imgur.com/endpoints/image
        MultipartBody body = new MultipartBody.Builder("AaB03x")
                .setType(MultipartBody.FORM)
                .addPart(
                        Headers.of("Content-Disposition", "form-data; name=\"title\""),
                        RequestBody.create(null, "Square Logo"))
                .addPart(
                        Headers.of("Content-Disposition", "form-data; name=\"image\""),
                        RequestBody.create(MEDIA_TYPE_PNG, new File("website/static/logo-square.png")))
                .build();
    
        Request request = new Request.Builder()
                .header("Authorization", "Client-ID " + IMGUR_CLIENT_ID)
                .url("https://api.imgur.com/3/image")
                .post(body)
                .build();
    
        Call call = client.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
    
            }
    
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                System.out.println(response.body().string());
            }
        });
    }

[https_mvnrepository.com_artifact_com.squareup.okhttp3_okhttp]: https://mvnrepository.com/artifact/com.squareup.okhttp3/okhttp