Java操作文件代码大全

import java.io.File;  import java.io.FileInputStream;  import java.io.FileOutputStream;  import java.io.FilenameFilter;    public class FileUtil {   private final static String FILE_SUFFIX = ".java.drl";   private final static String FILE_TEMP = "C:/temp/";       /**    * 创建文件夹,如果有则不创建    *     * @param ObjectPath    */   public static boolean creareDirectory(String ObjectPath) {    boolean flag = true;    File filePath = new File(ObjectPath);    if (!filePath.exists()) {     filePath.mkdir();     flag = false;    }    return flag;   }     /**    * 查看某文件夹下面是否有文件,有文件则创建一个temp文件夹,将文件拷贝到temp目录下(备份文件) 没有文件怎什么都不做    * 备份后，把原文件夹里文件删除    *     * @param ObjectPath    */   public static void backupFile(String ObjectPath, String dirName) {    String backupPath;    if (!FILE_TEMP.endsWith(File.separator)) {     backupPath = FILE_TEMP + File.separator + dirName;    } else {     backupPath = FILE_TEMP + dirName;    }    File backupFilePath = new File(backupPath);    if (!backupFilePath.exists()) {     backupFilePath.mkdirs();    }    File filePath = new File(ObjectPath);    if (!filePath.exists()) {     System.out.println("目录不存在!");    } else {     if (filePath.isDirectory()) {      File[] list = filePath.listFiles();      if (list != null && list.length != 0) {       copyFolder(ObjectPath, backupPath);// 文件备份       for (int i = 0; i < list.length; i++) {        list[i].delete();       }      }     }    }   }     /**    * 复原文件，把文件从备份文件夹拷贝到原来文件夹    *     * @param ObjectPath    * @param dirName    */   public static void recoverFile(String ObjectPath, String dirName) {    String backupPath;    if (ObjectPath.endsWith(File.separator)) {     ObjectPath = new StringBuffer(ObjectPath).append(dirName)       .toString();    } else {     ObjectPath = new StringBuffer(ObjectPath)       .append(File.separatorChar).append(dirName).toString();    }    if (!FILE_TEMP.endsWith(File.separator)) {     backupPath = FILE_TEMP + File.separator + dirName;    } else {     backupPath = FILE_TEMP + dirName;    }    File backupFilePath = new File(backupPath);    if (!backupFilePath.exists()) {     backupFilePath.mkdirs();    }    File filePath = new File(ObjectPath);    if (!filePath.exists()) {     System.out.println("目录不存在!");    } else {     if (filePath.isDirectory()) {      File[] list = filePath.listFiles();      if (list != null && list.length != 0) {       copyFolder(backupPath, ObjectPath);// 文件复原      }     }    }   }     /**    * 复制整个文件夹内容    *     * @param oldPath    *            String 原文件路径 如：c:/fqf    * @param newPath    *            String 复制后路径 如：f:/fqf/ff    * @return boolean    */   public static void copyFolder(String oldPath, String newPath) {    try {     (new File(newPath)).mkdir(); // 如果文件夹不存在 则建立新文件夹     File a = new File(oldPath);     String[] file = a.list();     File temp = null;     for (int i = 0; i < file.length; i++) {      if (oldPath.endsWith(File.separator)) {       temp = new File(oldPath + file[i]);      } else {       temp = new File(oldPath + File.separator + file[i]);      }      if (temp.isFile()) {       FileInputStream input = new FileInputStream(temp);       FileOutputStream output = new FileOutputStream(newPath         + "/" + (temp.getName()).toString());       byte[] b = new byte[1024 * 5];       int len;       while ((len = input.read(b)) != -1) {        output.write(b, 0, len);       }       output.flush();       output.close();       input.close();      }      if (temp.isDirectory()) {// 如果是子文件夹       copyFolder(oldPath + "/" + file[i], newPath + "/" + file[i]);      }     }    } catch (Exception e) {     System.out.println("复制整个文件夹内容操作出错");     e.printStackTrace();    }   }     /**    * 删除备份文件和存放备份文件的文件夹    *     * @param ObjectPath    */   public static void deleteFileAndDirectory(String dirName) {    String ObjectPath;    if (!FILE_TEMP.endsWith(File.separator)) {     ObjectPath = FILE_TEMP + File.separator + dirName;    } else {     ObjectPath = FILE_TEMP + dirName;    }    File filePath = new File(ObjectPath);    if (!filePath.exists()) {     filePath.mkdirs();     System.out.println("目录不存在!");    } else {     if (filePath.isDirectory()) {      File[] list = filePath.listFiles();      for (int i = 0; i < list.length; i++) {       list[i].delete();      }     }     filePath.delete();    }   }     /**    * 判断某文件夹下是否存在文件，存在返回true    *     * @param ObjectPath    * @return    */   public static boolean existFileInDirectory(String ObjectPath) {    boolean flag = false;    File filePath = new File(ObjectPath);    if (filePath.exists()) {     if (filePath.isDirectory()) {      File[] list = filePath.listFiles();      if (list != null && list.length != 0) {       flag = true;      }     }    }    return flag;   }     /**    * 删除某个文件夹    *     * @param ObjectPath    */   public static void deleteDirectory(String ObjectPath) {    File filePath = new File(ObjectPath);    if (filePath.exists()) {     filePath.delete();    }   }     /**    * 将已存在的文件删除    *     * @param ObjectPath    */   public static boolean deleteExistedFile(String ObjectPath,     final String fileName) {    boolean flag = false;    File filePath = new File(ObjectPath);    if (filePath.exists()) {     if (filePath.isDirectory()) {      File[] list = filePath.listFiles(new FilenameFilter() {       public boolean accept(File dir, String name) {        return name.equals(fileName);       }      });      for (int i = 0; i < list.length; i++) {       list[i].delete();      }      flag = true;     }    }    return flag;   }   public static void main(String[] args) {    creareDirectory("D:\\zhangjun");  //  deleteDirectory("D:\\zhangjun");    copyFolder("D:\\zhangjun","D:\\12");    System.out.println(existFileInDirectory("D:\\zhangjun"));    deleteExistedFile("D:\\","test.pdf");   }  }