// 2012-4-18下午07:49:44
package com.su.funycard.util;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.util.Log;
import com.su.funycard.bean.PicFileBean;
public class FileUtil {
// 复制文件
public static void copyFile(String ssourceFile, String stargetFile) {
String folderpath = stargetFile.substring(0,
stargetFile.lastIndexOf("/"));
FileUtil.createFolder(folderpath);
File sourceFile = new File(ssourceFile);
File targetFile = new File(stargetFile);
try {
FileInputStream input = new FileInputStream(sourceFile);
BufferedInputStream inBuff = new BufferedInputStream(input);
// 新建文件输出流并对它进行缓冲
FileOutputStream output = new FileOutputStream(targetFile);
BufferedOutputStream outBuff = new BufferedOutputStream(output);
// 缓冲数组
byte[] b = new byte[1024 * 5];
int len;
while ((len = inBuff.read(b)) != -1) {
outBuff.write(b, 0, len);
}
// 刷新此缓冲的输出流
outBuff.flush();
// 关闭流
inBuff.close();
outBuff.close();
output.close();
input.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static int getMyEleCounts(String path) {
File file = new File(path);
if (file.isDirectory()) {
return file.list().length;
}
return 0;
}
public static List<PicFileBean> getImageNames(String folderPath) {
List<PicFileBean> pictureFiles = new ArrayList<PicFileBean>();
File file = new File(folderPath);
if (file.isDirectory()) {
String[] filelist = file.list();
for (int i = 0; i < filelist.length; i++) {
File file02 = new File(folderPath + "/" + filelist[i]);
if (!file02.isDirectory()) {
// if (isImageFile(file02.getName())) {
PicFileBean pictureFile = new PicFileBean(filelist[i],
file02.getAbsolutePath());
pictureFiles.add(pictureFile);
// }
}
}
}
return pictureFiles;
}
private static boolean isImageFile(String fileName) {
String fileEnd = fileName.substring(fileName.lastIndexOf(".") + 1,
fileName.length());
if (fileEnd.equalsIgnoreCase("jpg")) {
return true;
} else if (fileEnd.equalsIgnoreCase("png")) {
return true;
} else if (fileEnd.equalsIgnoreCase("bmp")) {
return true;
} else {
return false;
}
}
/**
* 复制asset文件夹下的文件到sd卡上
*
* @param context
* 上下文
* @param assetDir
* asset指定文件夹的路径
* @param dir
* sd卡指定文件夹的路径
*/
public static void copyAssets(Context context, String assetDir, String dir) {
String[] files;
try {
files = context.getResources().getAssets().list(assetDir);
} catch (IOException e1) {
return;
}
File mWorkingPath = new File(dir);
// if this directory does not exists, make one.
if (!mWorkingPath.exists()) {
if (!mWorkingPath.mkdirs()) {
}
}
for (int i = 0; i < files.length; i++) {
try {
String fileName = files[i];
// we make sure file name not contains '.' to be a folder.
if (!fileName.contains(".")) {
if (0 == assetDir.length()) {
// 这里使用的递归
copyAssets(context, fileName, dir + fileName + "/");
} else {
copyAssets(context, assetDir + "/" + fileName, dir
+ fileName + "/");
}
continue;
}
File outFile = new File(mWorkingPath, fileName);
if (outFile.exists()) {
continue;
}
InputStream in = null;
if (0 != assetDir.length()) {
in = context.getAssets().open(assetDir + "/" + fileName);
} else {
in = context.getAssets().open(fileName);
}
OutputStream out = new FileOutputStream(outFile);
// Transfer bytes from in to out
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
public static boolean existFile(String path) {
File file = new File(path);
if (file.exists()) {
return true;
} else {
return false;
}
}
public static void createFolder(String path) {
File file = new File(path);
if (!file.exists()) {
file.mkdirs();
}
}
/**
* 删除文件夹
*
* @param folderPath
*/
public static void delFolder(String folderPath) {
try {
delAllFile(folderPath); // 删除完里面所有内容
String filePath = folderPath;
filePath = filePath.toString();
java.io.File myFilePath = new java.io.File(filePath);
myFilePath.delete(); // 删除空文件夹
} catch (Exception e) {
System.out.println("删除文件夹操作出错");
e.printStackTrace();
}
}
public static 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]);// 先删除文件夹里面的文件
delFolder(path + "/" + tempList[i]);// 再删除空文件夹
}
}
}
}
package com.su.filesystem;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import android.util.Log;
public class FileUtil {
public int j = 0;
public static ArrayList<File> list = new ArrayList<File>();
// 根据路径path获取该路径下的所有文件的文件名
public String[] getFileNames(String path) {
File file = new File(path);
return file.list();
}
public void renameFile(String oldFile, String newFile) {
File file = new File(oldFile);
file.renameTo(new File(newFile));
}
public void createFolder(String sfile) {
File file = new File(sfile);
file.mkdirs();
}
public void createFile(String sfile) throws IOException {
File file = new File(sfile);
file.createNewFile();
}
// 根据文件后缀名判断是不是txt文件
public boolean isTxtFile(String fileName) {
File file = new File(fileName);
String fileEnd = fileName.substring(fileName.lastIndexOf(".") + 1,
fileName.length());
if (fileEnd.equalsIgnoreCase("txt")) {
return true;
} else {
return false;
}
}
public boolean isMp3File(String fileName) {
String fileEnd = fileName.substring(fileName.lastIndexOf(".") + 1,
fileName.length());
if (fileEnd.equalsIgnoreCase("mp3")) {
return true;
} else {
return false;
}
}
public boolean isImageFile(String fileName) {
String fileEnd = fileName.substring(fileName.lastIndexOf(".") + 1,
fileName.length());
if (fileEnd.equalsIgnoreCase("jpg")) {
return true;
} else if (fileEnd.equalsIgnoreCase("png")) {
return true;
}
else if (fileEnd.equalsIgnoreCase("gif")) {
return true;
}
else
{
return false;
}
}
// 判断是什么格式的文件
public int isWhichFile(String fileName) {
String fileEnd = fileName.substring(fileName.lastIndexOf(".") + 1,
fileName.length());
if (fileEnd.equalsIgnoreCase("txt")) {
return R.drawable.file_txt;
} else if (fileEnd.equalsIgnoreCase("lrc")) {
return R.drawable.file_lrc;
} else {
return R.drawable.file_unknown;
}
}
public void copyFolder(String oldPath, String newPath) {
try {
(new File(newPath)).mkdirs();
// 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() && !newPath.contains(oldPath)) {// 如果是子文件夹
// 还要判断是否是复制在本目录下如果复制本目录下
// 那只递归一次否则死循环
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();
}
}
public boolean copyFile(String frompath, String topath) {
try {
File fromFile = new File(frompath);
File toFile = new File(topath);
FileInputStream fosfrom = new FileInputStream(fromFile);
FileOutputStream fosto = new FileOutputStream(toFile);
byte bt[] = new byte[1024];
int c;
while ((c = fosfrom.read(bt)) > 0) {
fosto.write(bt, 0, c); // 将内容写到新文件当中
}
fosfrom.close();
fosto.close();
} catch (Exception ex) {
Log.e("readfile", ex.getMessage());
}
return true;
}
public boolean delFile(String path) {
File file = new File(path);
return file.delete();
// return true;
}
public void delFolder(String folderPath) {
try {
delAllFile(folderPath); // 删除完里面所有内容
String filePath = folderPath;
filePath = filePath.toString();
java.io.File myFilePath = new java.io.File(filePath);
myFilePath.delete(); // 删除空文件夹
} catch (Exception e) {
System.out.println("删除文件夹操作出错");
e.printStackTrace();
}
}
/**
* 删除文件夹里面的所有文件
*
* @param path
*
*/
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]);// 先删除文件夹里面的文件
delFolder(path + "/" + tempList[i]);// 再删除空文件夹
}
}
}
public static ArrayList<File> getAllFiles(File root) {
File files[] = root.listFiles();
if (files != null)
for (File f : files) {
if (f.isDirectory()) {
getAllFiles(f);
} else {
if (f.getName().indexOf(".lrc") > 0)
list.add(f);
}
}
return list;
}
}
本文介绍了文件复制、创建、删除、重命名、目录创建等基本操作，涵盖了文件信息判断、文件后缀识别、文件类型识别、文件夹递归复制、文件复制、文件夹删除等功能。
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