我正在尝试使用Firebase为Java桌面应用程序构建后端

我已经尝试了几天用Java（不是Android）和Firebase进行简单用户身份validation。 在我开始使用Firebase的用户身份validation类之前，我尝试使用Java在我的Firebase参考上进行简单的保存和检索，但没有成功。 没有报告任何错误，但Firebase中没有任何错误（数据没有更改）。 过去，我已经能够将Firebase与Android SDK集成在一起，没有任何问题。 我正在使用Firebase JAR进行JVM，但一切都没有发生。

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 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) 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("[e-mail]", "password", "Chidiebere Nnadi", "en"); } }); firebaseAuth.start(); firebaseAuth.join(); } } 

Answer 1

我刚刚发现了它的问题。 线程在Firebase可以调用onComplete函数之前结束。 您可以在应用程序中最后一行代码之后的循环内调用Thread.sleep(x_ms) 。