Merge pull request #43 from junpengzhou/master

fix(1.9.1): 动态设置系统默认时区，避免写死的+8时区导致触发时间部署国外期望按系统默认时间进行触发时偏移触发导致的问题

Author: open-snail

snail-job-server-starter/src/main/java/com/aizuda/snailjob/server/SnailJobServerApplication.java

@@ -14,6 +14,7 @@
  */
 package com.aizuda.snailjob.server;
 
+import cn.hutool.core.util.StrUtil;
 import com.aizuda.snailjob.server.common.rpc.server.grpc.GrpcServer;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.boot.ApplicationRunner;
@@ -33,7 +34,9 @@
 public class SnailJobServerApplication {
 
     public static void main(String[] args) {
-        TimeZone.setDefault(TimeZone.getTimeZone("Asia/Shanghai"));
+        // 初始化默认时区
+        initDefaultTimeZone();
+        // 启动SnailJob服务
         SpringApplication.run(SnailJobServerApplication.class, args);
     }
 
@@ -47,7 +50,7 @@ public ApplicationRunner nettyStartupChecker(GrpcServer grpcServer,
                                                  ServletWebServerFactory serverFactory) {
         return args -> {
             // 判定Grpc
-            boolean started =  grpcServer.isStarted();
+            boolean started = grpcServer.isStarted();
             // 最长自旋10秒，保证 grpcHttpServer启动完成
             int waitCount = 0;
             while (!started && waitCount < 100) {
@@ -65,4 +68,27 @@ public ApplicationRunner nettyStartupChecker(GrpcServer grpcServer,
             }
         };
     }
+
+    /**
+     * 从环境变量读取时区配置，如果没有则使用系统默认时区
+     * fixed 避免固定上海时区导致部署国际化服务的机房时，时区如何设置调整都为上海时区时间进行触发的问题
+     */
+    private static void initDefaultTimeZone() {
+        String timezone = System.getenv("TZ");
+
+        if (StrUtil.isNotBlank(timezone)) {
+            try {
+                TimeZone.setDefault(TimeZone.getTimeZone(timezone.trim()));
+                log.info("--------> System timezone set to: {} from environment variable TZ", timezone);
+            } catch (Exception e) {
+                log.warn("--------> Invalid timezone '{}' from environment variable TZ, " +
+                                "using system default timezone. Error: {}",
+                        timezone, e.getMessage());
+            }
+            return;
+        }
+
+        log.info("--------> Environment variable TZ not set, using system default timezone: {}",
+                TimeZone.getDefault().getID());
+    }
 }