OKHttp3学习之五：POST请求（JSON参数形式）

需求：实现用户登陆，登录信息以JSON参数的形式发送

在app模块的build.gradle配置

compile 'com.squareup.okhttp3:okhttp:3.4.2'

实现源码

public void postRequest(View view) {
    String username = mEtUserName.getText().toString().trim();
    String password = mEtPassWord.getText().toString().trim();
    loginWithJson(username, password);
}

private void loginWithJson(String username, String password) {
    OkHttpClient client = new OkHttpClient();
    String url = SERVER_ADDRESS + "/login/json";

    //构建JSON参数
    JSONObject json = new JSONObject();
    try {
        json.put("username", username);
        json.put("password", password);
    } catch (JSONException e) {
        e.printStackTrace();
    }
    String jsonParams = json.toString();
    Log.i(TAG, "json params: " + jsonParams);

    //设置 Content-Type为 application/json
    RequestBody body = RequestBody.create(MediaType.parse("application/json"), jsonParams);
    Request request = new Request.Builder().url(url).post(body).build();

    client.newCall(request).enqueue(new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
            Log.i(TAG, "请求失败: " + e.getLocalizedMessage());
        }

        @Override
        public void onResponse(Call call, Response response) throws IOException {
            if (response.isSuccessful()) {
                ResponseBody body = response.body();
                if (body != null) {
                    String result = body.string();
                    Log.i(TAG, "返回成功: " + result);
                    body.close();

                    JSONObject json = null;
                    try {
                        json = new JSONObject(result);
                        final int code = json.optInt("code");
                        final String message = json.optString("message");
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                if (code == 1) {
                                    Log.i(TAG, "登录成功");
                                } else {
                                    Log.i(TAG, "登录失败");
                                }
                                Toast.makeText(MainActivity.this, message, Toast.LENGTH_SHORT).show();
                            }
                        });
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    });
}

请求JSON参数

json params: {"username":"Joe.Ye","password":"123456"}

服务器返回数据

{
    "code": 1,
    "message": "登陆成功"
}