Java 文件操作工具类(未测试)

package util;

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/";

/**
* 将已存在的drl文件删除
*
* @param ObjectPath
*/
public static void deleteExistedDRLFile(String ObjectPath) {
File filePath = new File(ObjectPath);
if (!filePath.exists()) {
System.out.println("目录不存在!");
} else {
if (filePath.isDirectory()) {
File[] list = filePath.listFiles(new FilenameFilter() {
public boolean accept(File dir, String name) {
return name.endsWith(FILE_SUFFIX);
}
});
for (int i = 0; i < list.length; i++) {
list[i].delete();
}
}
}
}

/**
* 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();
}

ab55
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;
}
}