diff --git a/pom.xml b/pom.xml
index a0c33b8..8fdb633 100644
--- a/pom.xml
+++ b/pom.xml
@@ -9,49 +9,76 @@
     <version>1.0.0</version>
 
     <properties>
+        <!-- 编译版本 -->
         <maven.compiler.source>17</maven.compiler.source>
         <maven.compiler.target>17</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <!-- JavaFX 版本（LTS 推荐） -->
+        <javafx.version>21.0.8</javafx.version>
     </properties>
 
     <dependencies>
+        <!-- Google Gson -->
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
             <version>2.10.1</version>
         </dependency>
+
+        <!-- JavaFX Controls (包含 ActionEvent, Button, Scene 等) -->
+        <dependency>
+            <groupId>org.openjfx</groupId>
+            <artifactId>javafx-controls</artifactId>
+            <version>${javafx.version}</version>
+        </dependency>
+
+        <!-- JavaFX FXML (如果你使用 .fxml 布局文件) -->
+        <dependency>
+            <groupId>org.openjfx</groupId>
+            <artifactId>javafx-fxml</artifactId>
+            <version>${javafx.version}</version>
+        </dependency>
+
+        <!-- JavaFX Graphics (基础图形支持) -->
+        <dependency>
+            <groupId>org.openjfx</groupId>
+            <artifactId>javafx-graphics</artifactId>
+            <version>${javafx.version}</version>
+        </dependency>
     </dependencies>
 
     <build>
         <plugins>
-            <!-- 禁用默认的 maven-jar-plugin 生成基础JAR -->
+            <!-- 插件1: 编译插件（确保使用 JDK 17） -->
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-jar-plugin</artifactId>
-                <version>3.3.0</version>
-                <executions>
-                    <execution>
-                        <id>default-jar</id>
-                        <phase>none</phase> <!-- 移除默认的打包阶段，不生成基础JAR -->
-                    </execution>
-                </executions>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.11.0</version>
+                <configuration>
+                    <source>17</source>
+                    <target>17</target>
+                </configuration>
             </plugin>
 
-            <!-- 仅保留 assembly 插件生成自定义JAR -->
+            <!-- 插件2: Assembly 打包插件（用于生成可运行的 fat jar） -->
+            <!-- 注意：开发时不要禁用默认 jar，否则 IDEA 无法运行 -->
             <plugin>
                 <artifactId>maven-assembly-plugin</artifactId>
                 <version>3.6.0</version>
                 <configuration>
                     <archive>
                         <manifest>
+                            <!-- 替换为你的主类全路径 -->
                             <mainClass>com.mathgenerator.Application</mainClass>
                         </manifest>
                     </archive>
                     <descriptorRefs>
                         <descriptorRef>jar-with-dependencies</descriptorRef>
                     </descriptorRefs>
-                    <finalName>mathgenerator</finalName> <!-- 自定义文件名 -->
-                    <appendAssemblyId>false</appendAssemblyId> <!-- 去掉后缀 -->
+                    <finalName>mathgenerator</finalName>
+                    <appendAssemblyId>false</appendAssemblyId>
+                    <goal>single</goal>
                 </configuration>
                 <executions>
                     <execution>
@@ -65,5 +92,4 @@
             </plugin>
         </plugins>
     </build>
-
 </project>
\ No newline at end of file
diff --git a/src/main/java/com/mathgenerator/service/UserService.java b/src/main/java/com/mathgenerator/service/UserService.java
index 05b2409..f154390 100644
--- a/src/main/java/com/mathgenerator/service/UserService.java
+++ b/src/main/java/com/mathgenerator/service/UserService.java
@@ -1,6 +1,7 @@
 package com.mathgenerator.service;
 
 import com.google.gson.Gson;
+import java.util.Objects;
 import com.google.gson.GsonBuilder;
 import com.google.gson.reflect.TypeToken;
 import com.mathgenerator.model.User;
@@ -81,10 +82,22 @@ public class UserService {
      * @return 成功返回true, 否则返回false
      */
     public boolean register(String username, String email, String password) {
-        if (userDatabase.containsKey(username) ||
-                userDatabase.values().stream().anyMatch(u -> u.email().equals(email))) {
+        // 1. 基础校验：防止 null 或空白输入
+        if (username == null || email == null || password == null ||
+                username.trim().isEmpty() || email.trim().isEmpty() || password.trim().isEmpty()) {
+            return false;
+        }
+
+        // 2. 检查用户名或邮箱是否已存在（使用 Objects.equals 安全比较）
+        boolean usernameExists = userDatabase.containsKey(username);
+        boolean emailExists = userDatabase.values().stream()
+                .anyMatch(u -> Objects.equals(u.email(), email));
+
+        if (usernameExists || emailExists) {
             return false; // 用户名或邮箱已存在
         }
+
+        // 3. 创建新用户并保存
         User newUser = new User(username, email, password);
         userDatabase.put(username, newUser);
         saveUsers();