Java 文件操作

标签：http   java   os   文件   io   for   

package com.lakala.util;
import org.apache.log4j.Logger;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
* Created with IntelliJ IDEA.
* To change this template use File | Settings | File Templates.
public class FileUtil {
public static final Logger LOGGER = Logger.getLogger(FileUtil.class);
private static final String FILE_SUFFIX = ".java.drl";
private static final 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()) {
LOGGER.info("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++) {
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* 创建文件夹,如果有则不创建
* @param objectPath
* @return
public static boolean creareDirectory(String objectPath) {
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)
* 没有文件则什么都不做
* 备份后，把原文件夹里文件删除
* @param objectPath
* @param dirName
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()) {
LOGGER.info("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()) {
LOGGER.info("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
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;
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) {
LOGGER.info("复制整个文件夹内容操作出错", e);
* 删除备份文件和存放备份文件的文件夹
* @param dirName
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();
LOGGER.info("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
* @param fileName
* @return
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;

Java 文件操作,布布扣,bubuko.com

Java 文件操作

标签：http   java   os   文件   io   for   

原文地址：http://www.cnblogs.com/cjings/p/3854631.html