在上一节 中，我们解决了API’s可以任意访问的问题，那么我们现在还有一个问题。
就是我们的日志，都是输出到控制台上的，这显然对于一个项目来说是不合理的，因此我们这一节简单封装log库，使其支持简单的文件日志！
项目地址：
新建logging包
我们在pkg下新建logging目录，新建file.go和log.go文件，写入内容：
编写file文件
1、 file.go：
- os.Stat：返回文件信息结构描述文件。如果出现错误，会返回*PathError
type PathError struct {
Op string
Path string
Err error
}
- os.IsNotExist：能够接受ErrNotExist、syscall的一些错误，它会返回一个 布尔值 ，能够得知文件不存在或目录不存在
- os.IsPermission：能够接受ErrPermission、syscall的一些错误，它会返回一个布尔值，能够得知权限是否满足
- os.OpenFile：调用文件，支持传入文件名称、指定的模式调用文件、文件权限，返回的文件的方法可以用于I/O。如果出现错误，则为*PathError。
- os.Getwd：返回与当前目录对应的根路径名
- os.MkdirAll：创建对应的目录以及所需的子目录，若成功则返回nil，否则返回error
- os.ModePerm：const定义ModePerm FileMode = 0777
编写 log文件
2、 log.go
log.New：创建一个新的日志记录器。out定义要写入日志数据的IO 句柄 。prefix定义每个生成的日志行的开头。flag定义了日志记录属性
func New(out io.Writer, prefix string, flag int) *Logger {
return &Logger{out: out, prefix: prefix, flag: flag}
}
- log.LstdFlags：日志记录的格式属性之一，其余的选项如下
当前目录结构：
我们自定义的logging包，已经基本完成了，接下来让它接入到我们的项目之中吧！
我们打开先前包含log包的代码，
- 打开routers目录下的article.go、tag.go、auth.go
- 将log包的引用删除，修改引用我们自己的日志包为gin-blog/pkg/logging
- 将原本的log.Println(…)改为logging.Info(…)
例如auth.go文件的修改内容：
验证功能
修改文件后，重启服务，我们来试试吧！
获取到API的Token后，我们故意传错误URL参数给接口，如：
然后我们到$GOPATH/gin-blog/runtime/logs查看日志：
日志结构一切正常，我们的记录模式都为Info，因此前缀是对的，并且我们是入参有问题，也把错误记录下来了，这样排错就很方便了！
至此，本节就完成了，这只是一个简单的扩展，实际上我们线上项目要使用的文件日志，是更复杂一些，开动你的大脑 举一反三吧！
参考
本系列示例代码
- go-gin-example
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