OkHttp3发起POST或GET请求

/**
 * HTTP接口-GET方式，请求参数形式为params形式
 *
 * @param url
 * @param param
 * @return String
 */
public static String sendGet(String url, String param) throws IOException {
    OkHttpClient client = new OkHttpClient().newBuilder()
            .connectTimeout(180, TimeUnit.SECONDS)
            .readTimeout(180, TimeUnit.SECONDS)
            .writeTimeout(180, TimeUnit.SECONDS)
            .build();
    String dataUrl = url + "?userName=" + param;
    Request request = new Request.Builder()
            .url(dataUrl)
            .get()
            .build();
    Response response;
    String result;
    try {
        response = client.newCall(request).execute();
        result = response.body().string();
    } catch (IOException e) {
        throw new IOException(DATA, e);
    }
    return result;
}

/**
 * 表单形式post请求
 *
 * @paramurl 请求地址
 * @parammap post请求参数
 * @return请求结果
 */
public static String doPostWithForm(Map<String, String> map, String url) throws IOException {
    OkHttpClient client = new OkHttpClient().newBuilder()
            .connectTimeout(180, TimeUnit.SECONDS)
            .readTimeout(180, TimeUnit.SECONDS)
            .writeTimeout(180, TimeUnit.SECONDS)
            .build();
    //构建一个formBody builder
    FormBody.Builder builder = new FormBody.Builder();
    //循环form表单，将表单内容添加到form builder中
    for (Map.Entry<String, String> entry : map.entrySet()) {
        String key = entry.getKey();
        String value = entry.getValue();
        builder.add(key, value);
    }
    //构建formBody，将其传入Request请求中
    FormBody body = builder.build();
    Request request = new Request.Builder().url(url).post(body).build();
    Call call = client.newCall(request);
    //返回请求结果
    try (Response response = call.execute()) {
        return response.body().string();
    } catch (IOException e) {
        throw new IOException(e);
    }
}

/**
 * HTTP接口-POST方式，请求参数形式为body-json形式
 *
 * @param url
 * @param jsonString
 * @return String
 */
public static String sendPostWithJson(String url, String jsonString) throws IOException {
    OkHttpClient client = new OkHttpClient().newBuilder().build();
    RequestBody body = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), jsonString);
    Request request = new Request.Builder()
            .post(body)
            .url(url)
            .build();
    Call call = client.newCall(request);
    //返回请求结果
    try {
        Response response = call.execute();
        return response.body().string();
    } catch (IOException e) {
        throw new IOException(e);
    }
}

/**
 * HTTP接口-POST方式，请求参数形式为params形式
 *
 * @param url
 * @param param
 * @return String
 */
public static String sendPost(String url, String param) throws IOException {
    OkHttpClient client = new OkHttpClient().newBuilder()
            .connectTimeout(180, TimeUnit.SECONDS)
            .readTimeout(180, TimeUnit.SECONDS)
            .writeTimeout(180, TimeUnit.SECONDS)
            .build();
    FormBody body = new FormBody.Builder().build();
    String dataUrl = url + "?userName=" + param;
    Request request = new Request.Builder()
            .url(dataUrl)
            .post(body)
            .build();
    Response response;
    String result;
    try {
        response = client.newCall(request).execute();
        result = response.body().string();
    } catch (IOException e) {
        throw new IOException(e);
    }
    return result;
}