英文:
how should i use JWT in android?
问题
我想使用jjwt来创建登录活动。
所以我不知道如何使用它。我在<https://github.com/jwtk/jjwt>上阅读了它，但由于我的英语不流利，所以我无法理解。我希望你能给我一个示例来帮助我理解。我应该向服务发送任何内容吗？还是我只需要在我的DatabaseHelper中使用sqlite openhelper保存密钥。
我使用OkHttp将用户名和密码发送到服务并使用json进行获取。
这是我的活动：
MainActivity：
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void btnSignin_Clicked(View view){
String username=((EditText)findViewById(R.id.txtUsername)).getText().toString();
String password=((EditText)findViewById(R.id.txtPassword)).getText().toString();
new SigninTask().execute(username,password);
}
public void btnSignup_Clicked(View view){
((EditText)findViewById(R.id.txtUsername)).setText("");
((EditText)findViewById(R.id.txtPassword)).setText("");
String username=((EditText)findViewById(R.id.txtUsername)).getText().toString();
String password=((EditText)findViewById(R.id.txtPassword)).getText().toString();
new SignupTask().execute(username,password);
}
private class SignupTask extends AsyncTask<String,Object,String>{
@Override
protected String doInBackground(String... strings) {
try {
return
new OkHttpClient()
.newCall(
new Request.Builder()
.url("http://localhost:8080/Service/signup?username="+strings[0]+"&password="+strings[1])
.build()
)
.execute()
.body()
.string();
}catch (Exception e){
return null;
}
}
@Override
protected void onPostExecute(String s) {
SimpleDialog dialog=new SimpleDialog();
dialog.setContext(MainActivity.this);
dialog.setTitle("Error");
try {
JSONObject jsonObject=new JSONObject(s);
Boolean result=jsonObject.getBoolean("value");
if (result){
String username= ((EditText)findViewById(R.id.txtUsername)).getText().toString();
dialog.setMessage("Signup completed)");
((EditText)findViewById(R.id.txtUsername)).setText("");
((EditText)findViewById(R.id.txtPassword)).setText("");
}else {
((EditText)findViewById(R.id.txtUsername)).setText("");
((EditText)findViewById(R.id.txtPassword)).setText("");
dialog.setMessage("Sign up failed !");
}
}catch (Exception e){
dialog.setMessage("Error occured !");
}
dialog.show(getSupportFragmentManager(),"dialog");
}
}
private class SigninTask extends AsyncTask<String,Object,String>{
@Override
protected String doInBackground(String... strings) {
try {
return new OkHttpClient()
.newCall(
new Request.Builder()
.url("http://localhost:8080/Service/authorize?username="+strings[0]+"&password="+strings[1])
.build()
)
.execute()
.body()
.string();
}catch (Exception e){
return null;
}
}
@Override
protected void onPostExecute(String s) {
SimpleDialog dialog=new SimpleDialog();
dialog.setContext(MainActivity.this);
dialog.setTitle("Error");
try {
JSONObject jsonObject=new JSONObject(s);
Boolean result=jsonObject.getBoolean("value");
if (result){
String username=((EditText)findViewById(R.id.txtUsername)).getText().toString();
String password=((EditText)findViewById(R.id.txtPassword)).getText().toString();
Intent intent=new Intent(MainActivity.this,CategoryActivity.class);
User user=new User();
user.setUsername(username);
user.setPassword(password);
intent.putExtra("user",user);
startActivity(intent);
finish();
}else {
dialog.setMessage("Invalid username or password !");
}
}catch (Exception e){
dialog.setMessage("Error occured !");
}
dialog.show(getSupportFragmentManager(),"dialog");
}
}
}
英文:
I want to use jjwt to create a login activity.
so i don't know how to use it . i read it in <https://github.com/jwtk/jjwt> but i couldn't understand because my English is not fluent. i want you to give me an example to understand it. should i send anything to service ? or just i should save key in my DatabaseHelper with sqlite openhelper .
i use OkHttp for sending username and password to service and get it with json.
this is my activity :
MainActivity :
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void btnSignin_Clicked(View view){
String username=((EditText)findViewById(R.id.txtUsername)).getText().toString();
String password=((EditText)findViewById(R.id.txtPassword)).getText().toString();
new SigninTask().execute(username,password);
}
public void btnSignup_Clicked(View view){
((EditText)findViewById(R.id.txtUsername)).setText("");
((EditText)findViewById(R.id.txtPassword)).setText("");
String username=((EditText)findViewById(R.id.txtUsername)).getText().toString();
String password=((EditText)findViewById(R.id.txtPassword)).getText().toString();
new SignupTask().execute(username,password);
}
private class SignupTask extends AsyncTask<String,Object,String>{
@Override
protected String doInBackground(String... strings) {
try {
return
new OkHttpClient()
.newCall(
new Request.Builder()
.url("http://localhost:8080/Service/signup?username="+strings[0]+"&password="+strings[1])
.build()
)
.execute()
.body()
.string();
}catch (Exception e){
return null;
}
}
@Override
protected void onPostExecute(String s) {
SimpleDialog dialog=new SimpleDialog();
dialog.setContext(MainActivity.this);
dialog.setTitle("Error");
try {
JSONObject jsonObject=new JSONObject(s);
Boolean result=jsonObject.getBoolean("value");
if (result){
String username= ((EditText)findViewById(R.id.txtUsername)).getText().toString();
dialog.setMessage("Signup completed)");
((EditText)findViewById(R.id.txtUsername)).setText("");
((EditText)findViewById(R.id.txtPassword)).setText("");
}else {
((EditText)findViewById(R.id.txtUsername)).setText("");
((EditText)findViewById(R.id.txtPassword)).setText("");
dialog.setMessage("Sign up failed !");
}
}catch (Exception e){
dialog.setMessage("Error occured !");
}
dialog.show(getSupportFragmentManager(),"dialog");
}
}
private class SigninTask extends AsyncTask<String,Object,String>{
@Override
protected String doInBackground(String... strings) {
try {
return new OkHttpClient()
.newCall(
new Request.Builder()
.url("http://localhost:8080/Service/authorize?username="+strings[0]+"&password="+strings[1])
.build()
)
.execute()
.body()
.string();
}catch (Exception e){
return null;
}
}
@Override
protected void onPostExecute(String s) {
SimpleDialog dialog=new SimpleDialog();
dialog.setContext(MainActivity.this);
dialog.setTitle("Error");
try {
JSONObject jsonObject=new JSONObject(s);
Boolean result=jsonObject.getBoolean("value");
if (result){
String username=((EditText)findViewById(R.id.txtUsername)).getText().toString();
String password=((EditText)findViewById(R.id.txtPassword)).getText().toString();
Intent intent=new Intent(MainActivity.this,CategoryActivity.class);
User user=new User();
user.setUsername(username);
user.setPassword(password);
intent.putExtra("user",user);
startActivity(intent);
finish();
}else {
dialog.setMessage("Invalid username or password !");
}
}catch (Exception e){
dialog.setMessage("Error occured !");
}
dialog.show(getSupportFragmentManager(),"dialog");
}
}
}
答案1
得分: 0
通常情况下，您会将登录数据（用户名、密码）发送到对您进行身份验证的服务器，然后该服务器会发送回一个JWT令牌。您可以将此令牌存储在您的应用程序中，然后在每个向服务器发送的请求中携带此令牌，以进行身份验证。
英文:
Normally you send your login data (user name, password) to the server that authenticates you, and this server sends back a JWT. You can store this token in your application. And then y' send this token within every request to the serve to authenticate you.
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