本文实例为大家分享了java将一个目录下的所有数据复制到另一个目录下的具体代码，供大家参考，具体内容如下

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"); } }}

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