Java将一个目录下的所有数据复制到另一个目录下

 /*
     将"C:\\JavaProducts\\Source"下的所有数据复制到"C:\\Target"下
 */

 import java.io.*;

 public class JavaCopyDemo{
     final static String SOURCESTRING = "C:\\JavaProducts\\Source";
     final static String TARGETSTRING = "C:\\Target";

     public static void main(String[] args){
         if(!(new File(SOURCESTRING)).exists()){
             System.out.println("源文件" + SOURCESTRING + "不存在，无法复制！");
             return;
         }else if((new File(TARGETSTRING)).exists()){
             System.out.println("目标文件" + TARGETSTRING + "已经存在，无法复制！");
             return;
         }else{
             if((new File(SOURCESTRING)).isFile()){
                 copyFile(new File(SOURCESTRING),new File(TARGETSTRING));
             }else if((new File(SOURCESTRING)).isDirectory()){
                 copyDirectory(SOURCESTRING,TARGETSTRING);
             }
         }
     }

     private static void copyFile(File sourceFile,File targetFile){
         if(!sourceFile.canRead()){
             System.out.println("源文件" + sourceFile.getAbsolutePath() + "不可读，无法复制！");
             return;
         }else{
             System.out.println("开始复制文件" + sourceFile.getAbsolutePath() + "到" + targetFile.getAbsolutePath());
             FileInputStream fis = null;
             BufferedInputStream bis = null;
             FileOutputStream fos = null;
             BufferedOutputStream bos = null;

             try{
                 fis = new FileInputStream(sourceFile);
                 bis = new BufferedInputStream(fis);
                 fos = new FileOutputStream(targetFile);
                 bos = new BufferedOutputStream(fos);
                 int len = 0;
                 while((len = bis.read()) != -1){
                     bos.write(len);
                 }
                 bos.flush();

             }catch(FileNotFoundException e){
                 e.printStackTrace();
             }catch(IOException e){
                 e.printStackTrace();
             }finally{
                 try{
                     if(fis != null){
                         fis.close();
                     }
                     if(bis != null){
                         bis.close();
                     }
                     if(fos != null){
                         fos.close();
                     }
                     if(bos != null){
                         bos.close();
                     }
                     System.out.println("文件" + sourceFile.getAbsolutePath() + "复制到" + targetFile.getAbsolutePath() + "完成");
                 }catch(IOException e){
                     e.printStackTrace();
                 }
             }
         }
     }

     private static void copyDirectory(String sourcePathString,String targetPathString){
         if(!new File(sourcePathString).canRead()){
             System.out.println("源文件夹" + sourcePathString + "不可读，无法复制！");
             return;
         }else{
             (new File(targetPathString)).mkdirs();
             System.out.println("开始复制文件夹" + sourcePathString + "到" + targetPathString);
             File[] files = new File(sourcePathString).listFiles();
             for(int i = 0; i < files.length; i++){
                 if(files[i].isFile()){
                     copyFile(new File(sourcePathString + File.separator + files[i].getName()),new File(targetPathString + File.separator + files[i].getName()));
                 }else if(files[i].isDirectory()){
                     copyDirectory(sourcePathString + File.separator + files[i].getName(),targetPathString + File.separator + files[i].getName());
                 }
             }
             System.out.println("复制文件夹" + sourcePathString + "到" + targetPathString + "结束");
         }
     }
 }