我正在尝试使用Firebase为Java桌面应用程序构建后端 [英] I am trying to use Firebase to build a Backend for a Java Desktop Application
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问题描述
import com.firebase.client.AuthData;
import com.firebase.client.DataSnapshot;
import com.firebase.client.Firebase;
import com.firebase.client.FirebaseError;
import com.firebase.client.ValueEventListener;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
$ b $ ** b
$ b * @author Chidi
* /
public class Auth {
private final Firebase usersRef;
private boolean isNewUser = false;
private String uid = null;
私有HashMap< String，Object> userHash;
public Auth（）{
Firebase rootRef = new Firebase（https://tranzchat.firebaseio.com/）;
this.usersRef = rootRef.child（users）;
userHash = new HashMap<>（）;
$ b $ public void createUser（final String email，final String password，String name，String default_lang）{
userHash.put（email，email）;
userHash.put（password，this.hashPassword（password））;
userHash.put（name，name）;
userHash.put（default_lang，default_lang）;
Vars.dbcon.createUser（email，password，new Firebase.ResultHandler（）{
@Override
public void onSuccess（）{
System.out.println（Created the新用户）;
//在创建新用户后将isNewUser设置为true $ b $ isNewUser = true;
signIn（email，password）; $ b $ if（uid！= null） {
//尝试存储使用信息
Firebase newUserRef = usersRef.child（uid）;
newUserRef.setValue（userHash，new Firebase.CompletionListener（）{
@Override
public void onComplete（FirebaseError fe，Firebase frbs）{
System.out.println（完成数据库插入）;
}
}）;
} else {
System.out.println（Could not retrieve ve UID）;
$ b $覆盖
public void onError（FirebaseError fe）{
System.out.println（创建用户时发生错误。）;
}
}）;
$ b $ public void signIn（String email，String password）{
Vars.dbcon.authWithPassword（email，password，new Firebase.AuthResultHandler（）{
@覆盖
public void onAuthenticated（AuthData authData）{
uid = authData.getUid（）;
if（！isNewUser）{
//尝试获取新的用户信息并将其存储在用户对象
usersRef.child（uid）.addValueEventListener（new ValueEventListener（）{
@Override
public void onDataChange（DataSnapshot snapshot）{
userHash =（HashMap< String ，Object>）snapshot.getValue（）;
}
@Override
public void onCancelled（FirebaseError firebaseError）{
System.out.println（The read failed：+ firebaseError.getMessag E（））;
}
}）;
$ b @Override
public void onAuthenticationError（FirebaseError firebaseError）{
//出现错误
}
}）;
public String hashPassword（String password）{
String md5 = null;
if（password == null）return null;
尝试{
//为MD5创建MessageDigest对象
MessageDigest digest = MessageDigest.getInstance（MD5）;
//更新消息摘要中的输入字符串
digest.update（password.getBytes（），0，password.length（））;
//以16为基数（十六进制）转换消息摘要值
md5 = new BigInteger（1，digest.digest（））。toString（）;
} catch（NoSuchAlgorithmException e）{
e.printStackTrace（）;
}
返回md5;
Test Suite
public static void main（String [] args）throws InterruptedException {
Vars.init（）;
线程firebaseAuth = new Thread（new Runnable（）{
@Override
public void run（）{
Auth au = new Auth（）;
au.createUser （chidiebere.nnadi@gmail.com，password，Chidiebere Nnadi，en）;
}
}）;
firebaseAuth.start（）;
firebaseAuth.join（）;
$ div $解析方案刚刚发现它的问题。线程在Firebase可以调用onComplete函数之前结束。你可以在应用程序的最后一行代码之后的一个循环内调用一个 Thread.sleep（x_ms）。
I have been trying for a few days to do Simple User Authentication with Java (not Android) and Firebase. Before I started out with Firebase's user authentication classes I tried using Java to do a simple save and retrieve on my Firebase Reference with no success. No errors are reported but nothing happens in Firebase (no changes to the data). In the past, I have been able to integrate Firebase with Android SDK with no issues. I am making use of Firebase JAR for JVM but nothing is happening.
import com.firebase.client.AuthData;
import com.firebase.client.DataSnapshot;
import com.firebase.client.Firebase;
import com.firebase.client.FirebaseError;
import com.firebase.client.ValueEventListener;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
/**
*
* @author Chidi
*/
public class Auth {
private final Firebase usersRef;
private boolean isNewUser = false;
private String uid = null;
private HashMap<String, Object> userHash;
public Auth() {
Firebase rootRef = new Firebase("https://tranzchat.firebaseio.com/");
this.usersRef = rootRef.child("users");
userHash = new HashMap<>();
}
public void createUser(final String email, final String password, String name, String default_lang) {
userHash.put("email", email);
userHash.put("password", this.hashPassword(password));
userHash.put("name", name);
userHash.put("default_lang", default_lang);
Vars.dbcon.createUser(email, password, new Firebase.ResultHandler() {
@Override
public void onSuccess() {
System.out.println("Created the new user");
// Sets isNewUser to true after creating the new user
isNewUser = true;
signIn(email, password);
if(uid != null) {
// Try to store use information
Firebase newUserRef = usersRef.child(uid);
newUserRef.setValue(userHash, new Firebase.CompletionListener(){
@Override
public void onComplete(FirebaseError fe, Firebase frbs) {
System.out.println("Completed Database Insertion");
}
});
} else {
System.out.println("Could not retrieve UID");
}
}
@Override
public void onError(FirebaseError fe) {
System.out.println("An error occured while creating the user.");
}
});
}
public void signIn(String email, String password) {
Vars.dbcon.authWithPassword(email, password, new Firebase.AuthResultHandler() {
@Override
public void onAuthenticated(AuthData authData) {
uid = authData.getUid();
if(!isNewUser) {
// Try to get new user information and store it in the user object
usersRef.child(uid).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
userHash = (HashMap<String, Object>) snapshot.getValue();
}
@Override
public void onCancelled(FirebaseError firebaseError) {
System.out.println("The read failed: " + firebaseError.getMessage());
}
});
}
}
@Override
public void onAuthenticationError(FirebaseError firebaseError) {
// there was an error
}
});
}
public String hashPassword(String password) {
String md5 = null;
if(password == null) return null;
try {
// Create MessageDigest object for MD5
MessageDigest digest = MessageDigest.getInstance("MD5");
// Update input string in message digest
digest.update(password.getBytes(), 0, password.length());
// Converts message digest value in base 16 (hex)
md5 = new BigInteger(1, digest.digest()).toString();
} catch(NoSuchAlgorithmException e) {
e.printStackTrace();
}
return md5;
}
// Test Suite
public static void main(String[] args) throws InterruptedException {
Vars.init();
Thread firebaseAuth = new Thread(new Runnable() {
@Override
public void run() {
Auth au = new Auth();
au.createUser("chidiebere.nnadi@gmail.com", "password", "Chidiebere Nnadi", "en");
}
});
firebaseAuth.start();
firebaseAuth.join();
}
}
解决方案
I just found out the issue with it. The thread was ending before Firebase could call the onComplete function. You can just call a Thread.sleep(x_ms) within a loop after the last line of code in the application.
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