Update: web.xml and generated files

web/WEB-INF/classes/com/demo/model/User.java

@@ -0,0 +1,30 @@
+package com.demo.model;
+
+/**
+ * 用户模型
+ * 展示 Struts2 的 ModelDriven 和 Bean 封装
+ */
+public class User {
+    private Long id;
+    private String username;
+    private String email;
+    private String phone;
+    
+    public User() {}
+    
+    public User(Long id, String username, String email) {
+        this.id = id;
+        this.username = username;
+        this.email = email;
+    }
+    
+    // Getters and Setters
+    public Long getId() { return id; }
+    public void setId(Long id) { this.id = id; }
+    public String getUsername() { return username; }
+    public void setUsername(String username) { this.username = username; }
+    public String getEmail() { return email; }
+    public void setEmail(String email) { this.email = email; }
+    public String getPhone() { return phone; }
+    public void setPhone(String phone) { this.phone = phone; }
+}