Java操作文件代碼大全

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/";
/**

創建文件夾,如果有則不創建

@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;
}
/**

查看某文件夾下面是否有文件,有文件則創建一個temp文件夾,將文件拷貝到temp目錄下(備份文件) 沒有文件怎什么都不做
備份后，把原文件夾里文件刪除

@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("目錄不存在!");
} else {
if (filePath.isDirectory()) {
File[] list = filePath.listFiles();
if (list != null && list.length != 0) {
 copyFolder(ObjectPath, backupPath);// 文件備份
 for (int i = 0; i < list.length; i++) {
  list[i].delete();
 }
}
}
}
}
/**

復原文件，把文件從備份文件夾拷貝到原來文件夾

@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("目錄不存在!");
} else {
if (filePath.isDirectory()) {
File[] list = filePath.listFiles();
if (list != null && list.length != 0) {
 copyFolder(backupPath, ObjectPath);// 文件復原
}
}
}
}
/**

復制整個文件夾內容

@param oldPath
String 原文件路徑 如：c:/fqf
@param newPath
String 復制后路徑 如：f:/fqf/ff
@return boolean
*/
public static void copyFolder(String oldPath, String newPath) {
try {
(new File(newPath)).mkdir(); // 如果文件夾不存在 則建立新文件夾
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()) {// 如果是子文件夾
copyFolder(oldPath + "/" + file[i], newPath + "/" + file[i]);
}
}
} catch (Exception e) {
System.out.println("復制整個文件夾內容操作出錯");
e.printStackTrace();
}
}

/**

刪除備份文件和存放備份文件的文件夾

@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("目錄不存在!");
} else {
if (filePath.isDirectory()) {
File[] list = filePath.listFiles();
for (int i = 0; i < list.length; i++) {
 list[i].delete();
}
}
filePath.delete();
}
}
/**

判斷某文件夾下是否存在文件，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;
}
/**

刪除某個文件夾

@param ObjectPath
*/
public static void deleteDirectory(String ObjectPath) {
File filePath = new File(ObjectPath);
if (filePath.exists()) {
filePath.delete();
}
}
/**

將已存在的文件刪除

@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");
}
}</pre>