java File类字节流(复制、删除、剪切，下载)操作，多线程

package com.insigma.teacher.Thread.io; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.URL; public class FileUtil { //复制文件 public void copyFile(String source, String dest) { File sourceFile = new File(source); File destFile = new File(dest + "/" + sourceFile.getName()); try { FileInputStream fis = new FileInputStream(sourceFile); FileOutputStream fos = new FileOutputStream(destFile); BufferedInputStream bis = new BufferedInputStream(fis); BufferedOutputStream bos = new BufferedOutputStream(fos); int len = 0; byte[] b = new byte[1024]; while((len = bis.read(b)) != -1) { bos.write(b, 0, len); } bos.close(); bis.close(); fos.close(); fis.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //复制文件及文件夹 public void copyField(String source, String dest) { File sourceFile = new File(source); //文件夹复制 if(sourceFile.isDirectory()) { String[] names = sourceFile.list(); File file = new File(dest + "/" + sourceFile.getName()); if(!file.exists()) { file.mkdir(); } for(String name : names) { copyField(source + "/" + name, file.getPath()); } } //文件复制 else { this.copyFile(source, dest); } } //删除文件及文件夹 public void deleteField(String source) { File sourceFile = new File(source); //文件夹 if(sourceFile.isDirectory()) { String[] names = sourceFile.list(); //删除当前文件夹下面的子文件和子文件夹 for (String name : names) { deleteField(source + "/" + name); } //删除当前文件夹 sourceFile.delete(); } //文件 else { sourceFile.delete(); } } //剪切文件及文件夹 public void cutField(String source, String dest) { //复制文件夹 //删除文件夹 } //从网络上下载资源 public void download(URL url) { try { InputStream is = url.openStream(); FileOutputStream fos = new FileOutputStream("e:/123.gif"); BufferedInputStream bis = new BufferedInputStream(is); BufferedOutputStream bos = new BufferedOutputStream(fos); byte[] b = new byte[1024]; int len = 0; while((len = bis.read(b)) != -1) { bos.write(b, 0, len); } bos.close(); bis.close(); fos.close(); is.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }