Question

我正在开发一个Android应用程序，我必须与后端集成（在java和spring开发）。哪个是集成WebServices或通过http（JSON）的最佳方式..？提前致谢。

Answer 1

JSON作为名称说java脚本对象表示法将帮助您在后端利用OOPS，POST / GET和js。我使用JSON，它易于编码，解析和处理

Answer 2

要在Android / Java中获取JSON响应，您需要执行以下操作：

创建自定义API连接器类
声明将返回JSON数组的方法
创建AsyncTask类（可选）

解码JSONArray

1.
public class CustomAPIConnector {
public final String URL = "http://10.0.2.2/your-project-url/"; // 10.0.2.2 goes to computer localhost if you put localhost, it will go to the devices localhost which should not exist
2.
public JSONArray getUserInfo(String username, String password) {    

HttpEntity httpEntity = null;
// Add your POST variables to receive on your backend
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("username",username));
nameValuePairs.add(new BasicNameValuePair("password",password));
try {
    DefaultHttpClient httpClient = new DefaultHttpClient();

    HttpPost httpPost = new HttpPost(URL + "login.php"); // have split up URL and page so you can redirect to different links easier if the URL changes
    httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));


    HttpResponse httpResponse = httpClient.execute(httpPost);
    httpEntity = httpResponse.getEntity();

} catch (IOException e) {
    e.printStackTrace();
}

JSONArray jsonArray = null;
if(httpEntity != null) {
    try {
        String entityResponse = EntityUtils.toString(httpEntity);
        jsonArray = new JSONArray(entityResponse);
    } catch (JSONException e) {
        e.printStackTrace();
    } catch(IOException e) {
        e.printStackTrace();
    }
}
return jsonArray;
}
}

3.
private class AvailableUser extends AsyncTask<ApiConnector,Boolean,JSONArray> {

@Override
protected JSONArray doInBackground(ApiConnector... params) {
    return params[0].availableUsername(etusername.getText().toString());
}

@Override
protected void onPostExecute(JSONArray jsonArray) {
    checkAvailableUsername(jsonArray);
}
}

private class AvailableEmail extends AsyncTask<ApiConnector,Boolean,JSONArray> {

@Override
protected JSONArray doInBackground(ApiConnector... params) {
    return params[0].availableEmail(etemail.getText().toString());
}

@Override
protected void onPostExecute(JSONArray jsonArray) {
    checkAvailableEmail(jsonArray);
}
}
4.
private void checkAvailableEmail(JSONArray jsonArray) {
String s = "";
if(jsonArray != null) {
    for (int i = 0; i < jsonArray.length(); i++) {
            JSONObject json = null;
        try {
            json = new JSONObject();
            json = jsonArray.getJSONObject(i);
            if(!json.getString("count").isEmpty()) {
                if(json.getString("count").equalsIgnoreCase("0")) {
                    status.setText("");
                    passedemail = true;
                    return;
                } else {
                    status.setText("Email Taken");
                    passedemail = false;
                    return;
                }
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    } 
} else {
    status.setText("Failed - checkAvailableEmail");
}
}

请请注意，这是我在其中一个注册用户的应用程序中的实际代码，getUserInfo从用户获取所有信息，并且Available email asynctask类与getUserInfo分开，它是注册部分，用于检查电子邮件是否可用。

从此处开始，您可以复制代码并更改所需内容。

Android应用程序与后端的集成

2 个答案: