童鞋,这是偶的基础测试题诶....你可要自己动脑
package com.itheima;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.InputStream;
import java.io.OutputStream;
/**
* 第9题:编写一个程序,将d:\java 目录下的所有.java 文件复制到d:\jad 目录下,并将原来文件的扩展名从.java 改为.jad。
* @author
*/
public class Test9 {
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
File srcDir = new File("d:/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("共"+files.length+"个java文件");
File destDir = new File("d:/jad");
if(!destDir.exists()) destDir.mkdir();
for(File f :files){
FileInputStream fis = new FileInputStream(f);
String destFileName = f.getName().replaceAll(".java", ".jad");
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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