java 文件复制 文件夹复制工具类

自己写的工具类，有不对的地方或者可以优化的地方，希望留言，共同讨论

import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;public class CopyFileDirUtil {public static  int IS_EXISTS  = 0;public static void main(String[] args) {//String sourcePath = "D:/study_project/java-io-test.txt";//String targetPath = "D:/study_project/java-io-test-to.txt";String sourcePath = "D:/study_project/test";String targetPath = "D:/study_project/copyTest";//copyFile(sourcePath,targetPath);copyDirectory(sourcePath, targetPath);}/** * 文件的拷贝 * @param sourcePath * @param targetPath */public static void copyFile(String sourcePath,String targetPath){File sourceFile = new File(sourcePath);File targetFile = new File(targetPath);copyFile(sourceFile, targetFile);}/** * 文件的拷贝 * @param sourceFile * @param targetFile */public static void copyFile(File sourceFile,File targetFile){if(!sourceFile.exists()){System.out.println("源文件没有找到");return;}if(targetFile.exists()){System.out.println("目标文件已经存在，删除已存在的目标文件");targetFile.delete();}BufferedInputStream fis = null;BufferedOutputStream fos = null;int len = 100;int count = -1;byte[] buffer = new byte[len];try {fis = new BufferedInputStream(new FileInputStream(sourceFile));fos = new BufferedOutputStream(new FileOutputStream(targetFile));while ((count=fis.read(buffer, 0, len))!= -1) {fos.write(buffer, 0, count);}fos.flush();} catch (FileNotFoundException e) {e.printStackTrace();System.out.println("文件没有找到");} catch (IOException e) {e.printStackTrace();System.out.println("文件读取异常");} finally {try {fis.close();fos.close();} catch (Exception e) {System.out.println("流关闭异常");}}}/** * 文件夹拷贝 * @param sourcePath * @param targetPath */public static void copyDirectory(String sourcePath,String targetPath){File sourceFile = new File(sourcePath);File targetFile = new File(targetPath);copyDirectory(sourceFile, targetFile);}/** * 文件夹拷贝 * @param sourcePath * @param targetPath */public static void copyDirectory(File sourceFile,File targetFile){if(!sourceFile.exists()){System.out.println("源文件没有找到");return;}if(targetFile.exists() && IS_EXISTS == 0){System.out.println("目标文件已经存在，删除已存在的目标文件");targetFile.delete();IS_EXISTS = 1;}if(sourceFile.isDirectory()){targetFile.mkdir();}if(sourceFile.isDirectory()){File[] listFile = sourceFile.listFiles();for(File file : listFile){String newPath = file.getPath();String newCopyPath = targetFile.getPath()+File.separator+file.getName();if(file.isDirectory()){copyDirectory(newPath, newCopyPath);}else{copyFile(newPath, newCopyPath);}}}else{copyFile(sourceFile, targetFile);}}}

拷贝文件和文件夹增强健壮性，修改优化后的结果如下：

import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;public class CopyUtil {/** * @param args */public static void main(String[] args) {String source = "D:/2";//源String target = "D:/3";//目标File sou = new File(source);File tar = new File(target);if(sou.isDirectory()){//在目标文件下，创建源文件文件夹tar = new File(tar,sou.getName());}//拷贝文件copyDir(sou, tar);}/** * 拷贝文件夹 * @param source * @param target */public static void copyDir(File source,File target){if(source.isFile()){//如果源是一个文件//拷贝文件copyFile(source,target);}else if(source.isDirectory()){//如果源是一个文件夹//目标下创建文件夹target.mkdirs();//递归循环查找该文件夹下的所有文件和文件夹for(File sub : source.listFiles()){copyDir(sub,new File(target,sub.getName()));}}}/** * 拷贝文件 * @param sourceFile * @param targetFile */public static void copyFile(File sourceFile,File targetFile){if(targetFile.exists()){System.out.println("目标文件已经存在，删除已存在的目标文件");targetFile.delete();}BufferedInputStream fis = null;BufferedOutputStream fos = null;int len = 100;int count = -1;byte[] buffer = new byte[len];try {fis = new BufferedInputStream(new FileInputStream(sourceFile));fos = new BufferedOutputStream(new FileOutputStream(targetFile));//fis.read(buffer, 0, len) 每次最多读取len这个长度的数据，放入到buffer自己数据中，赋值给变量count,如果数据读取完毕，count=-1,作为推出循环的条件while ((count=fis.read(buffer, 0, len))!= -1) {//缓冲写出数据fos.write(buffer, 0, count);}//强制刷新数据到磁盘fos.flush();} catch (FileNotFoundException e) {e.printStackTrace();System.out.println("文件没有找到");} catch (IOException e) {e.printStackTrace();System.out.println("文件读取异常");} finally {try {fis.close();fos.close();} catch (Exception e) {System.out.println("流关闭异常");}}}}