首次提交：初始化项目代码

flag/config_priority.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func main() {
+	port := flag.Int("port", 8080, "服务端口")
+	host := flag.String("host", "localhost", "服务绑定主机")
+
+	flag.Parse()
+
+	// 环境变量仅覆盖未手动传参的配置
+	if !flag.IsSet("port") {
+		if envPort := os.Getenv("SERVICE_PORT"); envPort != "" {
+			if p, err := strconv.Atoi(envPort); err == nil {
+				*port = p
+			}
+		}
+	}
+
+	if !flag.IsSet("host") {
+		if envHost := os.Getenv("SERVICE_HOST"); envHost != "" {
+			*host = envHost
+		}
+	}
+
+	fmt.Printf("最终生效配置：主机=%s，端口=%d\n", *host, *port)
+}