fix(structs): limit user form validation to add/update flows

src/main/java/com/example/struts2/UserFormAction.java

@@ -13,6 +13,7 @@ import java.util.List;
  * - 动态方法调用
  */
 public class UserFormAction extends ActionSupport {
+    private String actionName;
     
     private static List<User> users = new ArrayList<>();
     private static Long idCounter = 1L;
@@ -70,6 +71,9 @@ public class UserFormAction extends ActionSupport {
     
     @Override
     public void validate() {
+        if (!("user_add".equals(actionName) || "user_update".equals(actionName))) {
+            return;
+        }
         if (user == null) {
             return;
         }
@@ -93,6 +97,8 @@ public class UserFormAction extends ActionSupport {
     
     public List<User> getUserList() { return userList; }
     public void setUserList(List<User> userList) { this.userList = userList; }
+    public String getActionName() { return actionName; }
+    public void setActionName(String actionName) { this.actionName = actionName; }
     
     // 内部类 - 用户实体
     public static class User {

src/main/resources/struts.xml

@@ -85,6 +85,7 @@
         </action>
         
         <action name="user_add" class="com.example.struts2.UserFormAction" method="add">
+            <param name="actionName">user_add</param>
             <result type="redirectAction">user</result>
             <result name="input">/user-form.jsp</result>
         </action>
@@ -94,6 +95,7 @@
         </action>
         
         <action name="user_update" class="com.example.struts2.UserFormAction" method="update">
+            <param name="actionName">user_update</param>
             <result type="redirectAction">user</result>
             <result name="input">/user-form.jsp</result>
         </action>