[Java知识库]java文件工具类

package com.baojiaren.service;

import java.io.*;

/**
 * @author ?????.倾心?、
 * @create 2021-08-02-23:24
 */
public class Test {

    public static void main(String[] args) throws IOException {

       // copy("F:\\APP\\pdf_to_word.jar","F:\\bjr\\");
        File src=new File("F:\\bjr");
        File dest=new File("F:\\APP\\");
        copyFolder(src,dest);
    }


    public static void copy(String srcPathStr, String desPathStr)
    {
        //获取源文件的名称
        String newFileName = srcPathStr.substring(srcPathStr.lastIndexOf("\\")+1); //目标文件地址
        System.out.println("源文件:"+newFileName);
        desPathStr = desPathStr + File.separator + newFileName; //源文件地址
        System.out.println("目标文件地址:"+desPathStr);
        try
        {
            FileInputStream fis = new FileInputStream(srcPathStr);//创建输入流对象
            FileOutputStream fos = new FileOutputStream(desPathStr); //创建输出流对象
            byte datas[] = new byte[1024*8];//创建搬运工具
            int len = 0;//创建长度
            while((len = fis.read(datas))!=-1)//循环读取数据
            {
                fos.write(datas,0,len);
            }
            fis.close();//释放资源
            fis.close();//释放资源
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
    public static void copyFolder(File src, File dest)
            throws IOException {

        if(src.isDirectory()){

            //if directory not exists, create it
            if(!dest.exists()){
                dest.mkdir();
                System.out.println("Directory copied from "
                        + src + "  to " + dest);
            }

            //list all the directory contents
            String files[] = src.list();

            for (String file : files) {
                //construct the src and dest file structure
                File srcFile = new File(src, file);
                File destFile = new File(dest, file);
                //recursive copy
                copyFolder(srcFile,destFile);
            }

        }else{
            //if file, then copy it
            //Use bytes stream to support all file types
            InputStream in = new FileInputStream(src);
            OutputStream out = new FileOutputStream(dest);

            byte[] buffer = new byte[1024];

            int length;
            //copy the file content in bytes
            while ((length = in.read(buffer)) > 0){
                out.write(buffer, 0, length);
            }

            in.close();
            out.close();
            System.out.println("File copied from " + src + " to " + dest);
        }
    }

}