feat: expand struts demo lab

web/WEB-INF/classes/com/demo/action/LoginAction.java

@@ -2,46 +2,92 @@ package com.demo.action;
 
 import com.opensymphony.xwork2.ActionSupport;
 
-/**
- * 用户登录 Action
- * 展示：
- * - 表单参数接收
- * - 数据验证
- * - Session 使用
- * - 返回不同结果
- */
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
 public class LoginAction extends ActionSupport {
-    
+
+    private static final DateTimeFormatter TIME_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
+
     private String username;
     private String password;
-    
+    private String displayName;
+    private String role;
+    private String loginTime;
+    private String recommendation;
+
     @Override
-    public String execute() throws Exception {
-        // 模拟登录验证
-        if ("admin".equals(username) && "123456".equals(password)) {
-            // 登录成功，设置 session
-            return SUCCESS;
-        } else if (username != null && !username.isEmpty()) {
-            // 登录失败
-            addActionError("用户名或密码错误!");
+    public String execute() {
+        username = normalize(username);
+        password = normalize(password);
+
+        if (!hasSubmitted()) {
             return INPUT;
         }
+
+        if ("admin".equals(username) && "123456".equals(password)) {
+            displayName = "System Demo Admin";
+            role = "Administrator";
+            loginTime = LocalDateTime.now().format(TIME_FORMATTER);
+            recommendation = "Continue with the user form, validation sample, or upload flow to explore the rest of the demo.";
+            return SUCCESS;
+        }
+
+        addActionError("Invalid demo credentials. Use admin / 123456.");
         return INPUT;
     }
-    
-    // 表单验证
+
     @Override
     public void validate() {
-        if (username == null || username.trim().length() < 3) {
-            addFieldError("username", "用户名至少3个字符");
+        if (!hasSubmitted()) {
+            return;
+        }
+        if (username == null || username.length() < 3) {
+            addFieldError("username", "Username must be at least 3 characters.");
         }
         if (password == null || password.length() < 6) {
-            addFieldError("password", "密码至少6个字符");
+            addFieldError("password", "Password must be at least 6 characters.");
         }
     }
-    
-    public String getUsername() { return username; }
-    public void setUsername(String username) { this.username = username; }
-    public String getPassword() { return password; }
-    public void setPassword(String password) { this.password = password; }
-}
+
+    private boolean hasSubmitted() {
+        return (username != null && !username.trim().isEmpty())
+            || (password != null && !password.trim().isEmpty());
+    }
+
+    private String normalize(String value) {
+        return value == null ? null : value.trim();
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public String getDisplayName() {
+        return displayName;
+    }
+
+    public String getRole() {
+        return role;
+    }
+
+    public String getLoginTime() {
+        return loginTime;
+    }
+
+    public String getRecommendation() {
+        return recommendation;
+    }
+}