编程实现文件复制和重命名-蒲公英云

编程实现文件复制和重命名

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。

package com.alex.test3;
import java.io.File;
import java.io.FileFilter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
public class Java2Jad {
    /**
     * @param args
     * @throws Exception 
     */
    public static void main(String[] args) throws Exception {
        File javaFile = new File("D:\\java");
        File[] javaFiles=null;
        if(javaFile.exists()&&javaFile.isDirectory()){
            javaFiles=javaFile.listFiles(
                    new FileFilter(){
                        public boolean accept(File pathname) {
                            return pathname.getName().endsWith(".java");
                        }
                    });
            copyAndRenameFiles(javaFiles,"D:\\jad","\\.java",".jad");
            System.out.println("copy successful...");
        }else{
            throw new Exception("there are not such directroy");
        }
    }
    public static void copyAndRenameFiles(File[] sourceFiles,String targetFilePath,String originalSuffix,String targetSuffix){
        File targetFile = new File(targetFilePath);
        FileWriter fw = null;
        FileReader fr = null;
        if(!targetFile.isDirectory()){
            targetFile.mkdir();
        }
        try {
            for(File file:sourceFiles){
                fw = new FileWriter(targetFilePath+"\\"+file.getName().replaceAll(originalSuffix, targetSuffix));
                int len=0;
                char[] cbuf=new char[(int)file.length()];
                fr = new FileReader(file);
                while((len=fr.read(cbuf))!=-1){
                    fw.write(cbuf,0,len);
                }
            }
            fw.close();
        } catch (IOException e) {
            e.printStackTrace();
        }    
    }
}