java文件复制

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需求：将d:\java目录下的所有.java文件复制到d:\av目录下,并将原来文件的扩展名从.java改为.av。

实现代码

import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.FilenameFilter;import java.io.InputStream;import java.io.OutputStream;public class Java2av {public static void main(String[] args) throws Exception {File srcDir = new File("java");if(!(srcDir.exists() && srcDir.isDirectory()))throw new Exception("目录不存在");File[] files = srcDir.listFiles(new FilenameFilter(){public boolean accept(File dir, String name) {return name.endsWith(".java");}});System.out.println(files.length);File destDir = new File("av");if(!destDir.exists()) destDir.mkdir();for(File f :files){FileInputStream  fis = new FileInputStream(f);String destFileName = f.getName().replaceAll("\\.java$", ".av");FileOutputStream fos = new FileOutputStream(new File(destDir,destFileName));copy(fis,fos);fis.close();fos.close();}}private static void copy(InputStream ips,OutputStream ops) throws Exception{int len = 0;byte[] buf = new byte[1024];while((len = ips.read(buf)) != -1){ops.write(buf,0,len);}}}

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