Javaファイルやディレクトリの追加・削除・コピーについて詳しく解説

package com.wangpeng.utill;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.InputStream;
import java.io.PrintWriter;

/**
 * @author wangpeng
 * 
 */
public class ToolOfFile {

 /**
 * 创建目录
 * 
 * @param folderPath
 *      目录目录
 * @throws Exception
 */
 public static void newFolder(String folderPath) throws Exception {
 try {
  java.io.File myFolder = new java.io.File(folderPath);
  if (!myFolder.exists()) {
  myFolder.mkdir();
  }
 } catch (Exception e) {
  throw e;
 }
 }

 /**
 * 创建文件
 * 
 * @param filePath
 *      文件路径
 * @throws Exception
 */
 public static void newFile(String filePath) throws Exception {
 try {
  File myFile = new File(filePath);
  if (!myFile.exists()) {
  myFile.createNewFile();
  }
 } catch (Exception e) {
  throw e;
 }
 }

 /**
 * 创建文件，并写入内容
 * 
 * @param filePath
 *      文件路径
 * @param fileContent
 *      被写入的文件内容
 * @throws Exception
 */
 public static void newFile(String filePath, String fileContent)
  throws Exception {
 // 用来写入字符文件的便捷类
 FileWriter fileWriter = null;
 // 向文本输出流打印对象的格式化表示形式,使用指定文件创建不具有自己主动行刷新的新
 PrintWriter printWriter = null;
 try {
  File myFile = new File(filePath);
  if (!myFile.exists()) {
  myFile.createNewFile();
  }

  fileWriter = new FileWriter(myFile);
  printWriter = new PrintWriter(fileWriter);

  printWriter.print(fileContent);
  printWriter.flush();
 } catch (Exception e) {
  throw e;
 } finally {
  if (printWriter != null) {
  printWriter.close();
  }
  if (fileWriter != null) {
  fileWriter.close();
  }
 }
 }

 /**
 * 复制文件
 * 
 * @param oldPath
 *      被拷贝的文件
 * @param newPath
 *      复制到的文件
 * @throws Exception
 */
 public static void copyFile(String oldPath, String newPath)
  throws Exception {
 InputStream inStream = null;
 FileOutputStream outStream = null;
 try {
  int byteread = 0;
  File oldfile = new File(oldPath);
  // 文件存在时
  if (oldfile.exists()) {
  inStream = new FileInputStream(oldfile);
  outStream = new FileOutputStream(newPath);

  byte[] buffer = new byte[1444];
  while ((byteread = inStream.read(buffer)) != -1) {
   outStream.write(buffer, 0, byteread);
  }
  outStream.flush();
  }
 } catch (Exception e) {
  throw e;
 } finally {
  if (outStream != null) {
  outStream.close();
  }
  if (inStream != null) {
  inStream.close();
  }
 }
 }

 /**
 * 复制文件
 * @param inStream 被拷贝的文件的输入流
 * @param newPath 被复制到的目标
 * @throws Exception
 */
 public static void copyFile(InputStream inStream, String newPath)
  throws Exception {
 FileOutputStream outStream = null;
 try {
  int byteread = 0;
  outStream = new FileOutputStream(newPath);
  byte[] buffer = new byte[1444];
  while ((byteread = inStream.read(buffer)) != -1) {
  outStream.write(buffer, 0, byteread);
  }
  outStream.flush();
 } catch (Exception e) {
  throw e;
 } finally {
  if (outStream != null) {
  outStream.close();
  }
  if (inStream != null) {
  inStream.close();
  }
 }
 }

 /**
 * 复制目录
 * 
 * @param oldPath
 *      被复制的目录路径
 * @param newPath
 *      被复制到的目录路径
 * @throws Exception
 */
 public static void copyFolder(String oldPath, String newPath)
  throws Exception {
 try {
  (new File(newPath)).mkdirs(); // 假设目录不存在 则建立新目录
  File a = new File(oldPath);
  String[] file = a.list();
  File tempIn = null;
  for (int i = 0; i < file.length; i++) {
  if (oldPath.endsWith(File.separator)) {
   tempIn = new File(oldPath + file[i]);
  } else {
   tempIn = new File(oldPath + File.separator + file[i]);
  }

  if (tempIn.isFile()) {
   copyFile(tempIn.getAbsolutePath(),
    newPath + "/" + (tempIn.getName()).toString());
  } else if (tempIn.isDirectory()) {// 假设是子目录
   copyFolder(oldPath + "/" + file[i], newPath + "/" + file[i]);
  }
  }
 } catch (Exception e) {
  throw e;
 }
 }

 /**
 * 删除文件
 * 
 * @param filePathAndName
 */
 public static void delFileX(String filePathAndName) {
 File myDelFile = new File(filePathAndName);
 myDelFile.delete();
 }

 /**
 * 删除目录
 * 
 * @param path
 */
 public static void delForder(String path) {
 File delDir = new File(path);
 if (!delDir.exists()) {
  return;
 }
 if (!delDir.isDirectory()) {
  return;
 }
 String[] tempList = delDir.list();
 File temp = null;
 for (int i = 0; i < tempList.length; i++) {
  if (path.endsWith(File.separator)) {
  temp = new File(path + tempList[i]);
  } else {
  temp = new File(path + File.separator + tempList[i]);
  }

  if (temp.isFile()) {
  temp.delete();
  } else if (temp.isDirectory()) {
  // 删除完里面全部内容
  delForder(path + "/" + tempList[i]);
  }
 }
 delDir.delete();
 }

 public static void main(String[] args) {
 String oldPath = "F:/test/aaa/";
 String newPath = "F:/test/bbb/";

 try {
  // ToolOfFile.newFolder("F:/test/hello/");
  // ToolOfFile.newFile("F:/test/hello/world.txt","我爱你，the world！
");
  ToolOfFile.copyFolder(oldPath, newPath);
  // ToolOfFile.delForder("F:/test/hello");
 } catch (Exception e) {
  e.printStackTrace();
 }
 System.out.println("OK");
 }
}