Android 中的 JSON 发布

Question

我正在开发一个应用程序，我必须使用用户名和密码登录，以便无效用户无法登录，而有效用户可以。用户无法注册，将获得唯一的ID和密码。

因此，我为此使用了 JSON POST 方法。

但我无法发布数据。无论我提供什么 ID 和密码，都会收到默认错误消息。

错误消息：

01-02 11:31:38.047: V/响应 (2888): {"Login":"false","error":{"email":"请输入有效的Email 地址。","密码":"请输入您的密码。"}}

完整的代码贴在下面。

TextView tvIsConnected;
EditText username;
EditText password;
Button login;

Driver driver;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    tvIsConnected = (TextView) findViewById(R.id.tvIsConnected);
    username = (EditText) findViewById(R.id.username);
    password = (EditText) findViewById(R.id.password);
    login = (Button) findViewById(R.id.login);

    // check if you are connected or not
    if(isConnected()){
        tvIsConnected.setBackgroundColor(0xFF00CC00);
        tvIsConnected.setText("You are conncted");
    }
    else{
        tvIsConnected.setText("You are NOT conncted");
    }

 // add click listener to Button "POST"
    login.setOnClickListener(this);
}

public static String POST(String url, Driver driver){
    InputStream inputStream = null;
    String result = "";
    try {

        // 1. create HttpClient
        HttpClient httpclient = new DefaultHttpClient();

        // 2. make POST request to the given URL
        HttpPost httpPost = new HttpPost(url);

        String json = "";

        // 3. build jsonObject
        JSONObject jsonObject = new JSONObject();
        jsonObject.accumulate("username", driver.getUsername());
        jsonObject.accumulate("password", driver.getPassword());

        // 4. convert JSONObject to JSON to String
        json = jsonObject.toString();

        // ** Alternative way to convert Person object to JSON string usin Jackson Lib 
        // ObjectMapper mapper = new ObjectMapper();
        // json = mapper.writeValueAsString(person); 

        // 5. set json to StringEntity
        StringEntity se = new StringEntity(json);

        // 6. set httpPost Entity
        httpPost.setEntity(se);

        // 7. Set some headers to inform server about the type of the content   
        httpPost.setHeader("Accept", "application/json");
        httpPost.setHeader("Content-type", "application/json");

        // 8. Execute POST request to the given URL
        HttpResponse httpResponse = httpclient.execute(httpPost);

        // 9. receive response as inputStream
        inputStream = httpResponse.getEntity().getContent();

        // 10. convert inputstream to string
        if(inputStream != null)
            result = convertInputStreamToString(inputStream);
        else
            result = "Did not work!";

    } catch (Exception e) {
        Log.d("InputStream", e.getLocalizedMessage());
    }

    // 11. return result
    return result;
}

private static String convertInputStreamToString(InputStream inputStream) throws IOException{
    // TODO Auto-generated method stub
    BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(inputStream));
    String line = "";
    String result = "";
    while((line = bufferedReader.readLine()) != null)
        result += line;

    inputStream.close();
    return result;
}

private boolean isConnected() {
    // TODO Auto-generated method stub
    ConnectivityManager connMgr = (ConnectivityManager) getSystemService(Activity.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
    if (networkInfo != null && networkInfo.isConnected()) 
        return true;
    else
        return false;  
}

@Override
public void onClick(View view) {
    // TODO Auto-generated method stub
    switch(view.getId()){
    case R.id.login:
        if(!validate())
            Toast.makeText(getBaseContext(), "Enter some data!", Toast.LENGTH_LONG).show();
        // call AsynTask to perform network operation on separate thread
        new HttpAsyncTask().execute("http://dfl.tulieservices.biz/webservices/userOperation/user_login");
    break;
}
}

public class HttpAsyncTask extends AsyncTask<String, Void, String> {
    @Override
    protected String doInBackground(String... urls) {

        driver = new Driver();
        driver.setUsername(username.getText().toString());
        driver.setPassword(password.getText().toString());

        Log.v("USERNAME", username.getText().toString());
        Log.v("PASSWORD", password.getText().toString());

        return POST(urls[0],driver);




    }
    // onPostExecute displays the results of the AsyncTask.
    @Override
    protected void onPostExecute(String result) {

        Log.v("Response", result);
        Toast.makeText(getBaseContext(), result, Toast.LENGTH_LONG).show();
   }
}

private boolean validate(){
    if(username.getText().toString().trim().equals(""))
        return false;
    else if(password.getText().toString().trim().equals(""))
        return false;
    else
        return true;    
}

}

Answer 1

在下面的第 3 步尝试

    JSONObject jsonObject = new JSONObject();
    //jsonObject.accumulate("username", driver.getUsername());
    //jsonObject.accumulate("password", driver.getPassword());
    jsonObject.put("username", driver.getUsername());
    jsonObject.put("password", driver.getPassword());

Answer 2

删除您的 7 步并尝试使用公共静态字符串 POST 方法

TextView tvIsConnected;
EditText username;
EditText password;
Button login;

Driver driver;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    tvIsConnected = (TextView) findViewById(R.id.tvIsConnected);
    username = (EditText) findViewById(R.id.username);
    password = (EditText) findViewById(R.id.password);
    login = (Button) findViewById(R.id.login);

    // check if you are connected or not
    if(isConnected()){
        tvIsConnected.setBackgroundColor(0xFF00CC00);
        tvIsConnected.setText("You are conncted");
    }
    else{
        tvIsConnected.setText("You are NOT conncted");
    }

 // add click listener to Button "POST"
    login.setOnClickListener(this);
}

public static String POST(String url, Driver driver){
    InputStream inputStream = null;
    String result = "";

    try {

            // 1. create HttpClient
            HttpClient httpclient = new DefaultHttpClient();

            // 2. make POST request to the given URL
            HttpPost httpPost = new HttpPost(url);

            String json = "";

            // 3. build jsonObject
            JSONObject jsonObject = new JSONObject();
            jsonObject.put("username", username.getText().toString());
            jsonObject.put("password", password.getText().toString());

            // 4. convert JSONObject to JSON to String
            json = jsonObject.toString();

            // ** Alternative way to convert Person object to JSON string usin Jackson Lib 
            // ObjectMapper mapper = new ObjectMapper();
            // json = mapper.writeValueAsString(person); 

            // 5. set json to StringEntity
            StringEntity se = new StringEntity(json);

            // 6. set httpPost Entity
            httpPost.setEntity(se);


            // 8. Execute POST request to the given URL
            HttpResponse httpResponse = httpclient.execute(httpPost);

            // 9. receive response as inputStream
            inputStream = httpResponse.getEntity().getContent();

            // 10. convert inputstream to string
            if(inputStream != null)
                result = convertInputStreamToString(inputStream);
            else
                result = "Did not work!";

        } catch (Exception e) {
            Log.d("InputStream", e.getLocalizedMessage());
        }

        // 11. return result
        return result;
    }