集成 Spring Security 组件，重构后，整体逻辑更加清晰

src/main/java/cn/iocoder/dashboard/util/date/DateUtils.java

@@ -0,0 +1,19 @@
+package cn.iocoder.dashboard.util.date;
+
+import java.time.Duration;
+import java.util.Date;
+
+/**
+ * 时间工具类
+ */
+public class DateUtils {
+
+    public static Date addTime(Duration duration) {
+        return new Date(System.currentTimeMillis() + duration.toMillis());
+    }
+
+    public static boolean isExpired(Date time) {
+        return System.currentTimeMillis() > time.getTime();
+    }
+
+}

src/main/java/cn/iocoder/dashboard/util/servlet/ServletUtils.java

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+package cn.iocoder.dashboard.util.servlet;
+
+import cn.hutool.extra.servlet.ServletUtil;
+import com.alibaba.fastjson.JSON;
+import org.springframework.http.MediaType;
+
+
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * 客户端工具类
+ *
+ * @author 芋道源码
+ */
+public class ServletUtils {
+
+    @SuppressWarnings("deprecation") // 必须使用 APPLICATION_JSON_UTF8_VALUE，否则会乱码
+    public static void writeJSON(HttpServletResponse response, Object object) {
+        String content = JSON.toJSONString(object);
+        ServletUtil.write(response, content, MediaType.APPLICATION_JSON_UTF8_VALUE);
+    }
+
+}