是否将JWT代币存储在共享偏好中?并在整个应用程序中检索价值

Question

到目前为止，我为我的客户制作了一个应用程序，现在我集成了laravel API，我不理解JWT代币如何在会话中存储和检索到其他活动中。基本上，在成功登录API时创建JWT令牌和响应，我想将其保存在会话中。我可以从结果变量中的JSON对象中检索令牌，并将其显示在日志中，但我不知道如何将令牌存储到会话中，然后检索到我的所有应用程序中。在我的代码下面：

public class LoginActivity extends Activity {
private static final String TAG = RegisterActivity.class.getSimpleName();
private Button btnLogin;
private Button btnLinkToRegister;
private EditText inputEmail;
private EditText inputPassword;
private ProgressDialog pDialog;
private SessionManager session;
private SQLiteHandler db;
String  result;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
inputEmail = (EditText) findViewById(R.id.email);
inputPassword = (EditText) findViewById(R.id.password);
btnLogin = (Button) findViewById(R.id.btnLogin);

// Progress dialog
pDialog = new ProgressDialog(this);
pDialog.setCancelable(false);

// Session manager
session = new SessionManager(getApplicationContext());
// Check if user is already logged in or not
if (session.isLoggedIn()) {
// User is already logged in. Take him to main activity
Intent intent = new Intent(LoginActivity.this, MainActivity.class);
startActivity(intent);
finish();
}

btnLogin.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
String email = inputEmail.getText().toString().trim();
String password = inputPassword.getText().toString().trim();
// Check for empty data in the form
if (!email.isEmpty() && !password.isEmpty()) {
// login user
checkLogin(email, password);
} else {
// Prompt user to enter credentials
Toast.makeText(getApplicationContext(),
"Please enter the credentials!", Toast.LENGTH_LONG)
.show();
}
}
});

}
/**
* function to verify login details in mysql db
* */
private void checkLogin(final String email, final String password) {
// Tag used to cancel the request
String tag_string_req = "req_login";
pDialog.setMessage("Logging in ...");
showDialog();
StringRequest strReq = new StringRequest(Method.POST,
AppConfig.URL_LOGIN, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.e(TAG, "Login Response: " + response.toString());

hideDialog();
try {
JSONObject jObj = new JSONObject(response);
boolean error = jObj.getBoolean("error");
// Check for error node in json
if (!error) {
// user successfully logged in
// Create login session
session.setLogin(true);
//This is status api returned e.g 200 etc
Integer status = jObj.getInt("status");

//this is my token variable in this variable jwt is stored but how to store this variable in shared preferances.
String  result = jObj.getString("result");
Log.d(TAG, "Login Response: " + status.toString());
Log.e(TAG,"Token "+result.toString());
if(status == 200) {


Intent intent = new Intent(LoginActivity.this,
MainActivity.class);
//intent.putExtra("full_name", name);
intent.putExtra("result", result.toString());
startActivity(intent);
finish();
}
} else {
// Error in login. Get the error message
String errorMsg = jObj.getString("error_msg");
Toast.makeText(getApplicationContext(),
errorMsg, Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
// JSON error
e.printStackTrace();
Toast.makeText(getApplicationContext(), "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, "Login Error: " + error.getMessage());
Toast.makeText(getApplicationContext(),
error.getMessage(), Toast.LENGTH_LONG).show();
hideDialog();
}
}) {
@Override
protected Map<String, String > getParams() {
// Posting parameters to login url
Map<String, String> params = new HashMap<String, String>();
params.put("email", email);
params.put("password", password);
//params.put("result", result);
return params;
}
};
// Adding request to request queue
AppController.getInstance().addToRequestQueue(strReq, tag_string_req);
}
private void showDialog() {
if (!pDialog.isShowing())
pDialog.show();
}
private void hideDialog() {
if (pDialog.isShowing())
pDialog.dismiss();
}
}

这是我的共享偏好类代码：

public class SessionManager {
// LogCat tag
private static String TAG = SessionManager.class.getSimpleName();
// Shared Preferences
SharedPreferences pref;
Editor editor;
Context _context;
// Shared pref mode
int PRIVATE_MODE = 0;
// Shared preferences file name
private static final String PREF_NAME = "AndroidHiveLogin";

private static final String KEY_IS_LOGGED_IN = "isLoggedIn";
public SessionManager(Context context) {
this._context = context;
pref = _context.getSharedPreferences(PREF_NAME, PRIVATE_MODE);
editor = pref.edit();
}
public void setLogin(boolean isLoggedIn) {
editor.putBoolean(KEY_IS_LOGGED_IN, isLoggedIn);
// commit changes
editor.commit();
Log.d(TAG, "User login session modified!");
}

public boolean isLoggedIn(){
return pref.getBoolean(KEY_IS_LOGGED_IN, false);
}
}

Answer 1

在SessionManager类中添加以下方法

//Save String data to Shared Prefs
public boolean saveStringData(String key, String value) {
SharedPreferences.Editor editor=mSharedPref.edit ();
editor.putString (key, value);
return editor.commit ();
}
public String getStringData(String key) {
String value=mSharedPref.getString (key, "");
return value;
}

现在，在保存令牌时，调用saveStringData方法并传递一个唯一的密钥(请记住，在获取令牌时将使用此密钥(，并在值参数中传递令牌。

为了获取令牌，请调用getStringData方法并传递保存令牌时传递的密钥。

根据您的查询添加以上方法后只需写

1-用于保存令牌：

session.saveStringData ("jwtToken", jObj.getString("result"));

2-为了在应用程序中的任何位置获取令牌，首先初始化Session manager对象，然后调用getStringData方法，如下所示。

private SessionManager session; 
session = new SessionManager(getApplicationContext()); 
String token = session.getStringData("jwtToken");