1. FileOutputStream
2. FileInputStream
3. 复制文件
package com.ligy.studymvc.main2; import java.io.FileInputStream; import java.io.FileOutputStream; import java.text.SimpleDateFormat; public class main { public static void main(String[] args) throws Exception { //复制文件 System.out.println("程序开始执行:"); SimpleDateFormat dateformat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String dateStr = dateformat.format(System.currentTimeMillis()); System.out.println(dateStr); String f1 = "C:\\Users\\ASUS\\Desktop\\app前端页面\\钉钉密码登录.jpg"; String f2 = "D:\\钉钉密码登录.jpg"; FileOutputStream fileOutputStream = new FileOutputStream(f2); FileInputStream fileInputStream = new FileInputStream(f1); byte[] bs = new byte[100]; int len = 0; while ((len = fileInputStream.read(bs)) != -1) { fileOutputStream.write(bs, 0, len); } fileOutputStream.close(); fileInputStream.close(); System.out.println("程序结束执行:"); String dateStr2 = dateformat.format(System.currentTimeMillis()); System.out.println(dateStr2); } }