以前一直使用Retrofit2來進(jìn)行網(wǎng)絡(luò)請求,偶然的一次機(jī)會(huì),項(xiàng)目要求使用同步的網(wǎng)絡(luò)請求方式,我們都知道,Retrofit2使用異步的方式請求網(wǎng)絡(luò)(為了避免同步請求網(wǎng)絡(luò)阻塞UI線程).下面是詳細(xì)步驟 :

第一步 :

添加依賴包 :

// okhttp3的依賴
compile 'com.squareup.okhttp3:okhttp:3.8.1'
// gson解析的依賴
compile 'com.google.code.gson:gson:2.8.0'

如果你已經(jīng)添加了Retrofit2的依賴包,也可以 :

// Retrofit2的依賴
compile 'com.squareup.retrofit2:retrofit:2.3.0'
// gson解析的依賴
compile 'com.squareup.retrofit2:converter-gson:2.3.0'

第二步 :

AndroidManifest.xml中添加網(wǎng)絡(luò)權(quán)限 :

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

第三步 :

封裝4個(gè)函數(shù) : get 的同/異步方式, post 的同/異步方式

注意 : 同步get/post請求,都要放在子線程中,否則會(huì)報(bào)異常 : NetworkOnMainThreadException

3.1 get 同步請求

public static String getSync(String url){
    String s="";
    OkHttpClient client = new OkHttpClient();  
    Request request = new Request.Builder().url(url).build();  //創(chuàng)建url的請求
    Response response = null;
    try {
        response = client.newCall(request).execute();  //execute() : 同步, enqueue() : 異步
        s = response.body().string();  //獲取數(shù)據(jù)
    } catch (IOException e) {
        e.printStackTrace();
    }
    return s;
}

獲取到數(shù)據(jù)后(以Json數(shù)據(jù)為例),創(chuàng)建Bean類,并使用Gson來解析Json字符串 :

String s = OkHttp3Util.getSync(請求的url);
if (!TextUtils.isEmpty(s)) {
    Gson gson = new Gson();
    DataBean bean = gson.fromJson(s, DataBean.class);
    if (bean != null) {
       //操作數(shù)據(jù)....         
    }
}

3.2 post 同步請求

public static String postSync(String url, String body) {  //body為參數(shù)列表
    String s = "";
    OkHttpClient client = new OkHttpClient();
    //"application/x-www-form-urlencoded"  form表單數(shù)據(jù)被編碼為key/value格式發(fā)送到服務(wù)器（表單默認(rèn)的提交數(shù)據(jù)的格式）
    RequestBody requestBody = RequestBody.create(MediaType.parse("application/x-www-form-urlencoded"), body);
    Request request = new Request.Builder().url(url).post(requestBody).build();
    try {
        Response response = client.newCall(request).execute();
        s = response.body().string();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return s;
}

3.3 get 異步請求

public static void getAsync(String url, Callback callback) {
    OkHttpClient client = new OkHttpClient();
    Request request = new Request.Builder().url(url).build();
    client.newCall(request).enqueue(callback);
}

調(diào)用方式 :

OkHttp3Util.getAsync(請求的url, new Callback() {
    @Override
    public void onFailure(Call call, IOException e) {
        //請求失敗
    }

    @Override
    public void onResponse(Call call, Response response) throws IOException {
        //請求成功
        String string = response.body().string();
        if (!TextUtils.isEmpty(string)) {
            Gson gson = new Gson();
            AccountInfoBean bean = gson.fromJson(string, AccountInfoBean.class);
            //數(shù)據(jù)操作
        }
    }
});

3.4 post 異步請求

public static void postAsync(String url,String body,Callback callback) {
    OkHttpClient client = new OkHttpClient();
    RequestBody requestBody = RequestBody.create(MediaType.parse("application/x-www-form-urlencoded"), body);
    Request request = new Request.Builder().url(url).post(requestBody).build();
    client.newCall(request).enqueue(callback);
}

調(diào)用方式與get 異步請求類似