feat: add log rotation support

config/config.go

@@ -71,6 +71,7 @@ type (
 		Encode      string `xml:"encode,attr"`
 		FileMaxSize int64  `xml:"filemaxsize,attr"` //日志文件最大容量，单位为KB
 		FileName    string `xml:"filename,attr"`
+		MaxBackups  int    `xml:"maxbackups,attr"` //保留备份文件数量，0表示不清理
 	}
 
 	UdpTargetConfig struct {

config/json.go

@@ -8,5 +8,6 @@ type JSONTargetConfig struct {
 	Encode      string `yaml:"encode"`
 	FileName    string `yaml:"fileName"`
 	FileMaxSize int64  `yaml:"fileMaxSize"`
+	MaxBackups  int    `yaml:"maxBackups"` // 保留备份文件数量，0 表示不清理
 	PrettyPrint *bool  `yaml:"prettyPrint"`
 }

config/yaml.go

@@ -43,6 +43,7 @@ type fileTargetConfig struct {
 	Encode      string `yaml:"encode"`
 	FileMaxSize int64  `yaml:"fileMaxSize"`
 	FileName    string `yaml:"fileName"`
+	MaxBackups  int    `yaml:"maxBackups"` // 保留备份文件数量，0 表示不清理
 }
 
 type udpTargetConfig struct {
@@ -160,6 +161,7 @@ func LoadYamlConfig(configFile string) (*AppConfig, error) {
 			Encode:      t.Encode,
 			FileMaxSize: t.FileMaxSize,
 			FileName:    t.FileName,
+			MaxBackups:  t.MaxBackups,
 		}
 	}
 
@@ -220,6 +222,7 @@ func LoadYamlConfig(configFile string) (*AppConfig, error) {
 			Encode:      t.Encode,
 			FileName:    t.FileName,
 			FileMaxSize: t.FileMaxSize,
+			MaxBackups:  t.MaxBackups,
 			PrettyPrint: t.PrettyPrint,
 		}
 	}

const/const.go

@@ -1,7 +1,7 @@
 package _const
 
 const(
-	Version = "0.9.4"
+	Version = "0.10.1"
 )
 
 const (

example/rotation/main.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/devfeel/dotlog"
+)
+
+// 本示例展示日志轮转功能
+// 运行方式: go run main.go
+// 配置文件: rotation.yaml
+func main() {
+	// 启动日志服务（使用 YAML 配置）
+	err := dotlog.StartLogService("rotation.yaml")
+	if err != nil {
+		fmt.Printf("Failed to start log service: %v\n", err)
+		return
+	}
+
+	// 获取带轮转的 FileLogger
+	fileLog := dotlog.GetLogger("FileLogger")
+
+	// 获取 JSON Logger
+	jsonLog := dotlog.GetLogger("JSONLogger")
+
+	fmt.Println("开始写入日志（测试轮转功能）...")
+	fmt.Println("每条日志后会打印当前文件大小，达到 FileMaxSize 后会自动轮转")
+	fmt.Println("按 Ctrl+C 停止")
+
+	// 写入大量日志来触发轮转
+	count := 0
+	ticker := time.NewTicker(100 * time.Millisecond)
+	defer ticker.Stop()
+
+	for range ticker.C {
+		count++
+		msg := fmt.Sprintf("Test log message #%d - %s", count, time.Now().Format("15:04:05.000"))
+
+		// 写入文件日志
+		fileLog.Info(msg)
+
+		// 写入 JSON 日志
+		jsonLog.Info(msg)
+
+		// 每 100 条打印一次
+		if count%100 == 0 {
+			fmt.Printf("已写入 %d 条日志\n", count)
+		}
+	}
+}

example/rotation/rotation.yaml

@@ -0,0 +1,87 @@
+# dotlog 日志轮转配置示例
+# 演示 FileTarget 和 JSONTarget 的轮转功能
+
+global:
+  isLog: true
+  chanSize: 1000
+  innerLogPath: "./logs/"
+  innerLogEncode: "utf-8"
+
+# 自定义变量
+variables:
+  - name: LogDir
+    value: "./logs/"
+
+# 日志输出目标 - 演示轮转功能
+targets:
+  # 文件输出 - 带轮转
+  file:
+    - name: FileLogger
+      isLog: true
+      layout: "{datetime} - {message}"
+      encode: "utf-8"
+      fileMaxSize: 10  # 10KB，测试时使用小值快速触发轮转
+      fileName: "./logs/rotation/app.log"
+      maxBackups: 3    # 保留 3 个备份文件
+
+  # JSON 输出 - 带轮转
+  json:
+    - name: JSONLogger
+      isLog: true
+      layout: "{datetime} - {message}"
+      encode: "utf-8"
+      fileName: "./logs/rotation/app.json"
+      fileMaxSize: 10  # 10KB
+      maxBackups: 3
+      prettyPrint: true
+
+  # 标准输出（无轮转）
+  fmt:
+    - name: StdoutLogger
+      isLog: true
+      layout: "[{level}] {datetime} - {message}"
+      encode: "utf-8"
+
+# 日志记录器配置
+loggers:
+  - name: FileLogger
+    isLog: true
+    layout: "{datetime} - {message}"
+    configMode: "file"
+    levels:
+      - level: trace
+        targets: "FileLogger"
+        isLog: true
+      - level: debug
+        targets: "FileLogger"
+        isLog: true
+      - level: info
+        targets: "FileLogger"
+        isLog: true
+      - level: warn
+        targets: "FileLogger"
+        isLog: true
+      - level: error
+        targets: "FileLogger"
+        isLog: true
+
+  - name: JSONLogger
+    isLog: true
+    layout: "{datetime} - {message}"
+    configMode: "json"
+    levels:
+      - level: info
+        targets: "JSONLogger"
+        isLog: true
+      - level: error
+        targets: "JSONLogger"
+        isLog: true
+
+  - name: StdoutLogger
+    isLog: true
+    layout: "[{level}] {datetime} - {message}"
+    configMode: "fmt"
+    levels:
+      - level: info
+        targets: "StdoutLogger"
+        isLog: true