feat: finish bilingual session auth learning lab

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

@@ -0,0 +1,44 @@
+package com.demo.action;
+
+import com.opensymphony.xwork2.ActionSupport;
+import org.apache.struts2.interceptor.SessionAware;
+
+import java.util.Map;
+
+public class DashboardAction extends ActionSupport implements SessionAware {
+
+    private Map<String, Object> session;
+    private String displayName;
+    private String role;
+    private String loginTime;
+
+    @Override
+    public String execute() {
+        displayName = value(LoginAction.SESSION_USER, "ops-admin");
+        role = value(LoginAction.SESSION_ROLE, "admin");
+        loginTime = value(LoginAction.SESSION_LOGIN_TIME, "--");
+        return SUCCESS;
+    }
+
+    private String value(String key, String fallback) {
+        Object value = session == null ? null : session.get(key);
+        return value == null ? fallback : String.valueOf(value);
+    }
+
+    public String getDisplayName() {
+        return displayName;
+    }
+
+    public String getRole() {
+        return role;
+    }
+
+    public String getLoginTime() {
+        return loginTime;
+    }
+
+    @Override
+    public void setSession(Map<String, Object> session) {
+        this.session = session;
+    }
+}