1.添加依賴：

 implementation("com.squareup.okhttp3:okhttp:4.9.0")

2.配置請求：

• 2.1 GET請求：
• GET 同步請求：

 //同步請求，請求時沒回應(yīng)拔疚，會阻塞
    public void getSync(View view) {
    OkHttpClient okHttpClient = new OkHttpClient();
        //網(wǎng)絡(luò)請求必須在子線程執(zhí)行
        new Thread(){
            @Override
            public void run() {
                //Request代表請求對象肥隆，會將域名，請求地址稚失，參數(shù)封裝
                //若是要在get后面直接加參數(shù)格式是在get后面加：?a=1&b=2
                Request request = new Request.Builder().url("https://www.httpbin.org/get?a=1&b=2").build();
                //準(zhǔn)備好請求的Call對象
                Call call = okHttpClient.newCall(request);
                try {
                    Response response = call.execute();
                    Log.i(TAG, "getSync: "+response.body().string());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }.start();
    }

• GET異步請求：

 public void getAsync(View view) {
        OkHttpClient okHttpClient = new OkHttpClient();
        Request request = new Request.Builder().url("https://www.httpbin.org/get?a=1&b=2").build();
        //準(zhǔn)備好請求的Call對象
        Call call = okHttpClient.newCall(request);
        //進(jìn)行異步請求
        call.enqueue(new Callback() {
            @Override
            public void onFailure(@NotNull Call call, @NotNull IOException e) {

            }

            @Override
            public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
           //響應(yīng)碼 200~299成功栋艳，400~500服務(wù)器錯誤，跟服務(wù)器的通信是成功的都會回調(diào)這個函數(shù)句各，但是服務(wù)器處理請求的數(shù)據(jù)不一定成功
                if (response.isSuccessful()){
                    Log.i(TAG, "getAsync: "+response.body().string());
                }
            }
        });
    }

• 2.2 POST請求：
• POST同步請求：

   public void postSync(View view) {
        OkHttpClient okHttpClient = new OkHttpClient();
        //okhttp創(chuàng)建的request對象默認(rèn)是get請求吸占，如果是post要使用FormBody配合.post()設(shè)置
        //而POST請求要設(shè)置RequestBody
        new Thread(){
            @Override
            public void run() {
                FormBody formBody = new FormBody.Builder()
                        .add("a", "1")
                        .add("b", "2")
                        .build();
                Request request = new Request.Builder()
                        .url("https://www.httpbin.org/post")
                        .post(formBody)
                        .build();
                //準(zhǔn)備好請求的Call對象
                Call call = okHttpClient.newCall(request);
                try {
                    Response response = call.execute();
                    Log.i(TAG, "PostSync: "+response.body().string());
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        }.start();
    }

• POST異步請求：

 public void postAsync(View view) {
        OkHttpClient okHttpClient = new OkHttpClient();
        FormBody formBody = new FormBody.Builder()
                .add("a", "1")
                .add("b", "2")
                .build();
        Request request = new Request.Builder()
                .url("https://www.httpbin.org/post")
                .post(formBody)
                .build();
        //準(zhǔn)備好請求的Call對象
        Call call = okHttpClient.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(@NotNull Call call, @NotNull IOException e) {

            }

            @Override
            public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
                if (response.isSuccessful()){
                    Log.i(TAG, "PostAsync: "+response.body().string());
                }
            }
        });
    }

兩者綜合來看，request對應(yīng)的是get請求凿宾，而formbody對應(yīng)的是post請求

3.添加攔截器：

 public void interceptorTest(){
        //addInterceptor一定在前面執(zhí)行矾屯，addNetworkInterceptor一定在后面執(zhí)行
        //使用cache緩存
        OkHttpClient okHttpClient = new OkHttpClient.Builder()
                //開啟緩存
                .cache(new Cache(new File("C:\\Users\\Administrator\\Desktop\\cache"),1024*1024))
                .addInterceptor(new Interceptor() {
            @NotNull
            @Override
            public Response intercept(@NotNull Chain chain) throws IOException {
                //請求之前的前置處理，和請求之后的后置處理
                //例如請求前初厚，添加平臺件蚕，版本號
                //在請求前可以拿到這個request對象,再重新封裝一個新的request,把平臺信息和版本號封裝進(jìn)去，再發(fā)出去
                //攔截器可以添加多個产禾，按照順序來執(zhí)行
                Request request = chain.request().newBuilder().addHeader("os", "android").addHeader("version", "1.1.0").build();
                Response response = chain.proceed(request);
                return response;
            }
        }).addNetworkInterceptor(new Interceptor() {
            @NotNull
            @Override
            public Response intercept(@NotNull Chain chain) throws IOException {
                System.out.println("version:"+chain.request().header("version"));
                return chain.proceed(chain.request());
            }
        }).build();

        Request request = new Request.Builder().url("https://www.httpbin.org/get?a=1&b=2").build();
        Call call = okHttpClient.newCall(request);
        try {
            Response response = call.execute();
            System.out.println(response.body().string());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

4.文件上傳：

public void uploadFileTest(){
        //上傳的是：文件的key,文件的名字排作，文件本身
        //采用的是MultipartBody來封裝
        //MediaType詳情參考：https://blog.csdn.net/sinat_34241861/article/details/110648469
        //Content_Type：application/x-www-form-urlencoded 默認(rèn)是這種提交，采取的形式是鍵值對形式：key1:value1&key2:value2&key3:value3
        //Content_type:multipart/form-data下愈，數(shù)據(jù)被編碼為一條消息纽绍，一般用于文件上傳
        //Content_Type:application/octet-stream，提交二進(jìn)制數(shù)據(jù)势似，如果用于文件上傳拌夏，只能上傳一個文件
        //Content_Type:application/json,提交json數(shù)據(jù)
       OkHttpClient okHttpClient = new OkHttpClient();
        File file1 = new File("C:\\Users\\Administrator\\Desktop\\1.txt");
        File file2 = new File("C:\\Users\\Administrator\\Desktop\\2.txt");
        MultipartBody multipartBody = new MultipartBody.Builder()
                .addFormDataPart("file1", file1.getName(), RequestBody.create(file1, MediaType.parse("text/plain")))
                .addFormDataPart("file2", file2.getName(), RequestBody.create(file1, MediaType.parse("text/plain")))
                .addFormDataPart("a","1")//還可以添加額外的參數(shù)
                .build();
        Request request = new Request.Builder().url("https://www.httpbin.org/post").post(multipartBody).build();
        Call call = okHttpClient.newCall(request);
        try {
            Response response = call.execute();
            System.out.println(response.body().string());
        } catch (IOException e) {
            e.printStackTrace();
        }

5.Json數(shù)據(jù)上傳：

         //上傳json數(shù)據(jù)
        //使用的RequestBody來封裝
        OkHttpClient okHttpClient = new OkHttpClient();
        RequestBody requestBody = RequestBody.create("{\"a\":1,\"b\":2}", MediaType.parse("application/json"));
        Request request = new Request.Builder().url("https://www.httpbin.org/post").post(requestBody).build();
        Call call = okHttpClient.newCall(request);
        try {
            Response response = call.execute();
            System.out.println(response.body().string());
        } catch (IOException e) {
            e.printStackTrace();
        }

.使用cookies：

cookie是某些網(wǎng)站為了辨別用戶的身份僧著，進(jìn)行會話跟蹤（比如確定登錄狀態(tài)）而存儲在本地終端上的數(shù)據(jù)，由客戶端保存信息

public class UseCookie {
    //cookie的相關(guān)配置
    Map<String,List<Cookie>> cookies = new HashMap<>();
    @Test
    public void useCookie(){
        OkHttpClient okHttpClient = new OkHttpClient.Builder()
                .cookieJar(new CookieJar() {
                    @Override
                    public void saveFromResponse(@NotNull HttpUrl httpUrl, @NotNull List<Cookie> list) {
                        //會把服務(wù)器返回的cookie封裝成list集合障簿，返回回來盹愚，可以用文件保存或者放在內(nèi)存中
                        cookies.put(httpUrl.host(),list);
                    }
                    @NotNull
                    @Override
                    public List<Cookie> loadForRequest(@NotNull HttpUrl httpUrl) {
                        //請求網(wǎng)站的url
                      List<Cookie> cookies = UseCookie.this.cookies.get(httpUrl.host());
                      return cookies == null ? new ArrayList<Cookie>():cookies;
                    }
                })
                .build();
       //填入你自己的wanandroid賬號和密碼
        FormBody formBody = new FormBody.Builder().add("username", "xxx")
                .add("password", "xxxxxx").build();
        Request request = new Request.Builder().url("https://www.wanandroid.com/user/login")
                .post(formBody)
                .build();
        //準(zhǔn)備好請求的Call對象
        Call call = okHttpClient.newCall(request);
        //進(jìn)行同步請求
        try {
            Response response = call.execute();
            System.out.println(response.body().string());
        } catch (IOException e) {
            e.printStackTrace();
        }

        //請求收藏文章列表接口
        request = new Request.Builder().url("https://www.wanandroid.com/lg/collect/list/0/json")
                .build();
        //準(zhǔn)備好請求的Call對象
        call = okHttpClient.newCall(request);
        //進(jìn)行同步請求
        try {
            Response response = call.execute();
            System.out.println(response.body().string());
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}