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go
package main

import(
        "fmt"
        "io/ioutil"
)

func main(){
        //定义源文件:
        file1Path := "d:/Demo.txt"
        //定义目标文件:
        file2Path := "d:/Demo2.txt"

        //对文件进行读取:
        content,err := ioutil.ReadFile(file1Path)
        if err != nil {
                fmt.Println("读取有问题!")
                return
        }

        //写出文件:
        err = ioutil.WriteFile(file2Path,content,0666)
        if err != nil {
                fmt.Println("写出失败!")
        }
}

Java · Golang · Rust