/*

     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");

         }

     }

 }