這東西比較有用：[轉載].出處：http://mike20049.spaces.live.com/mmm2006-09-13_01.00/
我收藏啦.:)
import java.io.*;

public class FileOperate {
? public FileOperate() {
? }

? /**
?? * 新建目錄
?? * @param folderPath String 如 c:/fqf
?? * @return boolean
?? */
? public void newFolder(String folderPath) {
??? try {
????? String filePath = folderPath;
????? filePath = filePath.toString();
????? java.io.File myFilePath = new java.io.File(filePath);
????? if (!myFilePath.exists()) {
??????? myFilePath.mkdir();
????? }
??? }
??? catch (Exception e) {
????? System.out.println("新建目錄操作出錯");
????? e.printStackTrace();
??? }
? }

? /**
?? * 新建文件
?? * @param filePathAndName String 文件路徑及名稱 如c:/fqf.txt
?? * @param fileContent String 文件內容
?? * @return boolean
?? */
? public void newFile(String filePathAndName, String fileContent) {

??? try {
????? String filePath = filePathAndName;
????? filePath = filePath.toString();
????? File myFilePath = new File(filePath);
????? if (!myFilePath.exists()) {
??????? myFilePath.createNewFile();
????? }
????? FileWriter resultFile = new FileWriter(myFilePath);
????? PrintWriter myFile = new PrintWriter(resultFile);
????? String strContent = fileContent;
????? myFile.println(strContent);
????? resultFile.close();

??? }
??? catch (Exception e) {
????? System.out.println("新建目錄操作出錯");
????? e.printStackTrace();

??? }

? }

? /**
?? * 刪除文件
?? * @param filePathAndName String 文件路徑及名稱 如c:/fqf.txt
?? * @param fileContent String
?? * @return boolean
?? */
? public void delFile(String filePathAndName) {
??? try {
????? String filePath = filePathAndName;
????? filePath = filePath.toString();
????? java.io.File myDelFile = new java.io.File(filePath);
????? myDelFile.delete();

??? }
??? catch (Exception e) {
????? System.out.println("刪除文件操作出錯");
????? e.printStackTrace();

??? }

? }

? /**
?? * 刪除文件夾
?? * @param filePathAndName String 文件夾路徑及名稱 如c:/fqf
?? * @param fileContent String
?? * @return boolean
?? */
? public void delFolder(String folderPath) {
??? try {
????? delAllFile(folderPath); //刪除完里面所有內容
????? String filePath = folderPath;
????? filePath = filePath.toString();
????? java.io.File myFilePath = new java.io.File(filePath);
????? myFilePath.delete(); //刪除空文件夾

??? }
??? catch (Exception e) {
????? System.out.println("刪除文件夾操作出錯");
????? e.printStackTrace();

??? }

? }

? /**
?? * 刪除文件夾里面的所有文件
?? * @param path String 文件夾路徑 如 c:/fqf
?? */
? public void delAllFile(String path) {
??? File file = new File(path);
??? if (!file.exists()) {
????? return;
??? }
??? if (!file.isDirectory()) {
????? return;
??? }
??? String[] tempList = file.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();
????? }
????? if (temp.isDirectory()) {
??????? delAllFile(path+"/"+ tempList[i]);//先刪除文件夾里面的文件
??????? delFolder(path+"/"+ tempList[i]);//再刪除空文件夾
????? }
??? }
? }

? /**
?? * 復制單個文件
?? * @param oldPath String 原文件路徑 如：c:/fqf.txt
?? * @param newPath String 復制后路徑 如：f:/fqf.txt
?? * @return boolean
?? */
? public void copyFile(String oldPath, String newPath) {
??? try {
????? int bytesum = 0;
????? int byteread = 0;
????? File oldfile = new File(oldPath);
????? if (oldfile.exists()) { //文件存在時
??????? InputStream inStream = new FileInputStream(oldPath); //讀入原文件
??????? FileOutputStream fs = new FileOutputStream(newPath);
??????? byte[] buffer = new byte[1444];
??????? int length;
??????? while ( (byteread = inStream.read(buffer)) != -1) {
????????? bytesum += byteread; //字節數 文件大小
????????? System.out.println(bytesum);
????????? fs.write(buffer, 0, byteread);
??????? }
??????? inStream.close();
????? }
??? }
??? catch (Exception e) {
????? System.out.println("復制單個文件操作出錯");
????? e.printStackTrace();

??? }

? }

? /**
?? * 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 void copyFolder(String oldPath, String newPath) {

??? try {
????? (new File(newPath)).mkdirs(); //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();

??? }

? }

? /**
?? * 移動文件到指定目錄
?? * @param oldPath String 如：c:/fqf.txt
?? * @param newPath String 如：d:/fqf.txt
?? */
? public void moveFile(String oldPath, String newPath) {
??? copyFile(oldPath, newPath);
??? delFile(oldPath);

? }

? /**
?? * 移動文件到指定目錄
?? * @param oldPath String 如：c:/fqf.txt
?? * @param newPath String 如：d:/fqf.txt
?? */
? public void moveFolder(String oldPath, String newPath) {
??? copyFolder(oldPath, newPath);
??? delFolder(oldPath);

? }
}