package com.companyname.common.test;

import java.io.*;

/**
 * @Description
 * @Author Created by shusheng.
 * @Email [email protected]
 * @Date 2018/12/2
 */
public class CopyFolderDemo {

    public static void main(String[] args) throws IOException {
        // 封裝目錄
        File srcFolder = new File("E:\\【GIT-FILES】\\yix\\yix-common\\src\\main\\java\\com\\yiji\\yix\\common\\utils");
        
 
// 封裝目的地
        File destFolder = new File("E:\\test");
        // 如果目的地目錄不存在，就創建
        if (!destFolder.exists()) {
            destFolder.mkdirs();
        }
        // 獲取該目錄下的java文件的File數組
        File[] fileArray = srcFolder.listFiles(new FilenameFilter() {
            @Override
            public boolean
 
 accept(File dir, String name) {
                return new File(dir, name).isFile() && name.endsWith(".java");
            }
        });
        // 遍歷該File數組，得到每一個File對象,並復制到目標文件夾
        for (File file : fileArray) {
            String name = file.getName();
            String newName = name.replace(".java", ".jad");
            File newFile 
 
= new File(destFolder, newName);
            copyFile(file, newFile);
        }
    }

    public static void copyFile(File file, File newFile) throws IOException {
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(newFile));

        byte[] bytes = new byte[1024];
        int len = 0;
        while ((len = bis.read(bytes)) != -1) {
            bos.write(bytes, 0, len);
        }
        bis.close();
        bos.close();
    }
    
}

【復制指定目錄下的指定類型文件，並修改後綴名】