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文件处理类总结
1：依赖 compile ‘commons-io:commons-io:2.5‘
可使用FileUtils里的各种文件处理方法
2：文件处理类DirTraversal
**
* 文件夹遍历
* @author miaowei
*
*/
public class DirTraversal {
//no recursion
public static LinkedList<File> listLinkedFiles(String strPath) {
LinkedList<File> list = new LinkedList<File>();
File dir = new File(strPath);
File file[] = dir.listFiles();
for (int i = 0; i < file.length; i++) {
/*if (file[i].isDirectory()){
list.add(file[i]);
}else{
System.out.println(file[i].getAbsolutePath());
}*/
list.add(file[i]);
}
/*File tmp;
while (!list.isEmpty()) {
tmp = (File) list.removeFirst();
if (tmp.isDirectory()) {
file = tmp.listFiles();
if (file == null)
continue;
for (int i = 0; i < file.length; i++) {
if (file[i].isDirectory())
list.add(file[i]);
else
System.out.println(file[i].getAbsolutePath());
}
} else {
System.out.println(tmp.getAbsolutePath());
}
}*/
return list;
}
//recursion
public static ArrayList<File> listFiles(String strPath) {
return refreshFileList(strPath);
}
public static ArrayList<File> refreshFileList(String strPath) {
ArrayList<File> filelist = new ArrayList<File>();
File dir = new File(strPath);
File[] files = dir.listFiles();
if (files == null)
return null;
for (int i = 0; i < files.length; i++) {
if (files[i].isDirectory()) {
refreshFileList(files[i].getAbsolutePath());
} else {
if(files[i].getName().toLowerCase().endsWith("zip")){
filelist.add(files[i]);
}
}
}
return filelist;
}
public static ArrayList<File> arrayListFiles(String strPath){
ArrayList<File> filelist = new ArrayList<File>();
File dir = new File(strPath);
File[] files = dir.listFiles();
for (int i = 0; i < files.length; i++) {
filelist.add(files[i].getAbsoluteFile());
}
return filelist;
}
//-----4.0读取文件的报 open failed: ENOENT (No such file or directory)
/**
* 1\可先创建文件的路径
* @param filePath
*/
public static void makeRootDirectory(String filePath) {
File file = null;
try {
file = new File(filePath);
if (!file.exists()) {
file.mkdir();
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 2\然后在创建文件名就不会在报该错误
* @param filePath
* @param fileName
* @return
*/
public static File getFilePath(String filePath, String fileName) {
File file = null;
makeRootDirectory(filePath);
try {
file = new File(filePath + fileName);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return file;
}
/**
* 删除文件夹以及目录下的文件
* @param filePath 被删除目录的文件路径
* @return 目录删除成功返回true，否则返回false
*/
public static boolean deleteDirectory(String filePath) {
boolean flag = false;
//如果filePath不以文件分隔符结尾，自动添加文件分隔符
if (!filePath.endsWith(File.separator)) {
filePath = filePath + File.separator;
}
File dirFile = new File(filePath);
if (!dirFile.exists() || !dirFile.isDirectory()) {
return false;
}
flag = true;
File[] files = dirFile.listFiles();
//遍历删除文件夹下的所有文件(包括子目录)
for (int i = 0; i < files.length; i++) {
if (files[i].isFile()) {
//删除子文件
flag = deleteFile(files[i].getAbsolutePath());
if (!flag) break;
} else {
//删除子目录
flag = deleteDirectory(files[i].getAbsolutePath());
if (!flag) break;
}
}
if (!flag) return false;
//删除当前空目录
return dirFile.delete();
}
3：压缩，解压类ZipUtils
/**
* Java utils 实现的Zip工具
* @author miaowei
*
*/
public class ZipUtils {
private static final int BUFF_SIZE = 1024 * 1024; // 1M Byte
/**
* 批量压缩文件（夹）
*
* @param resFileList 要压缩的文件（夹）列表
* @param zipFile 生成的压缩文件
* @throws IOException 当压缩过程出错时抛出
*/
public static void zipFiles(Collection<File> resFileList, File zipFile) throws IOException {
ZipOutputStream zipout = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipFile), BUFF_SIZE));
for (File resFile : resFileList) {
zipFile(resFile, zipout, "");
}
zipout.close();
}
/**
* 批量压缩文件（夹）
*
* @param resFileList 要压缩的文件（夹）列表
* @param zipFile 生成的压缩文件
* @param comment 压缩文件的注释
* @throws IOException 当压缩过程出错时抛出
*/
public static void zipFiles(Collection<File> resFileList, File zipFile, String comment)
throws IOException {
ZipOutputStream zipout = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(
zipFile), BUFF_SIZE));
for (File resFile : resFileList) {
zipFile(resFile, zipout, "");
}
zipout.setComment(comment);
zipout.close();
}
/**
* 解压缩一个文件
*
* @param zipFile 压缩文件
* @param folderPath 解压缩的目标目录
* @throws IOException 当解压缩过程出错时抛出
*/
public static void upZipFile(File zipFile, String folderPath) throws ZipException, IOException {
File desDir = new File(folderPath);
if (!desDir.exists()) {
desDir.mkdirs();
}
ZipFile zf = new ZipFile(zipFile);
for (Enumeration<?> entries = zf.entries(); entries.hasMoreElements();) {
ZipEntry entry = ((ZipEntry)entries.nextElement());
if (entry.isDirectory()) {
continue;
}
InputStream in = zf.getInputStream(entry);
String str = folderPath + File.separator + entry.getName();
str = new String(str.getBytes(), "utf-8");
File desFile = new File(str);
if (!desFile.exists()) {
File fileParentDir = desFile.getParentFile();
if (!fileParentDir.exists()) {
fileParentDir.mkdirs();
}
desFile.createNewFile();
}
OutputStream out = new FileOutputStream(desFile);
byte buffer[] = new byte[BUFF_SIZE];
int realLength;
while ((realLength = in.read(buffer)) > 0) {
out.write(buffer, 0, realLength);
}
in.close();
out.close();
}
}
/**
* 解压文件名包含传入文字的文件
*
* @param zipFile 压缩文件
* @param folderPath 目标文件夹
* @param nameContains 传入的文件匹配名
* @throws ZipException 压缩格式有误时抛出
* @throws IOException IO错误时抛出
*/
public static ArrayList<File> upZipSelectedFile(File zipFile, String folderPath,
String nameContains) throws ZipException, IOException {
ArrayList<File> fileList = new ArrayList<File>();
File desDir = new File(folderPath);
if (!desDir.exists()) {
desDir.mkdir();
}
ZipFile zf = new ZipFile(zipFile);
for (Enumeration<?> entries = zf.entries(); entries.hasMoreElements();) {
ZipEntry entry = ((ZipEntry)entries.nextElement());
if (entry.getName().contains(nameContains)) {
InputStream in = zf.getInputStream(entry);
String str = folderPath + File.separator + entry.getName();
str = new String(str.getBytes("utf-8"), "gbk");
// str.getBytes("GB2312"),"8859_1" 输出
// str.getBytes("8859_1"),"GB2312" 输入
File desFile = new File(str);
if (!desFile.exists()) {
File fileParentDir = desFile.getParentFile();
if (!fileParentDir.exists()) {
fileParentDir.mkdirs();
}
desFile.createNewFile();
}
OutputStream out = new FileOutputStream(desFile);
byte buffer[] = new byte[BUFF_SIZE];
int realLength;
while ((realLength = in.read(buffer)) > 0) {
out.write(buffer, 0, realLength);
}
in.close();
out.close();
fileList.add(desFile);
}
}
return fileList;
}
/**
* 获得压缩文件内文件列表
*
* @param zipFile 压缩文件 * @return 压缩文件内文件名称 * @throws ZipException 压缩文件格式有误时抛出 * @throws IOException 当解压缩过程出错时抛出 */ public static ArrayList<String> getEntriesNames(File zipFile) throws ZipException, IOException { ArrayList<String> entryNames = new ArrayList<String>(); Enumeration<?> entries = getEntriesEnumeration(zipFile); while (entries.hasMoreElements()) { ZipEntry entry = ((ZipEntry)entries.nextElement()); entryNames.add(new String(getEntryName(entry).getBytes("GB2312"), "8859_1")); } return entryNames; } /** * 获得压缩文件内压缩文件对象以取得其属性 * * @param zipFile 压缩文件 * @return 返回一个压缩文件列表 * @throws ZipException 压缩文件格式有误时抛出 * @throws IOException IO操作有误时抛出 */ public static Enumeration<?> getEntriesEnumeration(File zipFile) throws ZipException, IOException { ZipFile zf = new ZipFile(zipFile); return zf.entries(); } /** * 取得压缩文件对象的注释 * * @param entry 压缩文件对象 * @return 压缩文件对象的注释 * @throws UnsupportedEncodingException */ public static String getEntryComment(ZipEntry entry) throws UnsupportedEncodingException { return new String(entry.getComment().getBytes("GB2312"), "8859_1"); } /** * 取得压缩文件对象的名称 * * @param entry 压缩文件对象 * @return 压缩文件对象的名称 * @throws UnsupportedEncodingException */ public static String getEntryName(ZipEntry entry) throws UnsupportedEncodingException { return new String(entry.getName().getBytes("GB2312"), "8859_1"); } /** * 压缩文件 * * @param resFile 需要压缩的文件（夹） * @param zipout 压缩的目的文件 * @param rootpath 压缩的文件路径 * @throws FileNotFoundException 找不到文件时抛出 * @throws IOException 当压缩过程出错时抛出 */ private static void zipFile(File resFile, ZipOutputStream zipout, String rootpath) throws FileNotFoundException, IOException { rootpath = rootpath + (rootpath.trim().length() == 0 ? "" : File.separator) + resFile.getName(); rootpath = new String(rootpath.getBytes(), "utf-8"); if (resFile.isDirectory()) { File[] fileList = resFile.listFiles(); for (File file : fileList) { zipFile(file, zipout, rootpath); } } else { byte buffer[] = new byte[BUFF_SIZE]; BufferedInputStream in = new BufferedInputStream(new FileInputStream(resFile), BUFF_SIZE); zipout.putNextEntry(new ZipEntry(rootpath)); int realLength; while ((realLength = in.read(buffer)) != -1) { zipout.write(buffer, 0, realLength); } in.close(); zipout.flush(); zipout.closeEntry(); } } //第二种实现 public static void zip(String src, String dest) throws IOException { // 提供了一个数据项压缩成一个ZIP归档输出流 ZipOutputStream out = null; try { //DirTraversal.makeRootDirectory(dest); //File outFile = DirTraversal.getFilePath(dest,"cache.zip"); File outFile = new File(dest);// 源文件或者目录 File fileOrDirectory = new File(src);// 压缩文件路径 out = new ZipOutputStream(new FileOutputStream(outFile)); // 如果此文件是一个文件，否则为false。 if (fileOrDirectory.isFile()) { zipFileOrDirectory(out, fileOrDirectory, ""); } else { // 返回一个文件或空阵列。 File[] entries = fileOrDirectory.listFiles(); for (int i = 0; i < entries.length; i++) { // 递归压缩，更新curPaths zipFileOrDirectory(out, entries[i], ""); } } } catch (IOException ex) { ex.printStackTrace(); } finally { // 关闭输出流 if (out != null) { try { out.close(); } catch (IOException ex) { ex.printStackTrace(); } } } } private static void zipFileOrDirectory(ZipOutputStream out, File fileOrDirectory, String curPath) throws IOException { // 从文件中读取字节的输入流 FileInputStream in = null; try { // 如果此文件是一个目录，否则返回false。 if (!fileOrDirectory.isDirectory()) { // 压缩文件 byte[] buffer = new byte[4096]; int bytes_read; in = new FileInputStream(fileOrDirectory); // 实例代表一个条目内的ZIP归档 ZipEntry entry = new ZipEntry(curPath + fileOrDirectory.getName()); // 条目的信息写入底层流 out.putNextEntry(entry); while ((bytes_read = in.read(buffer)) != -1) { out.write(buffer, 0, bytes_read); } out.closeEntry(); } else { // 压缩目录 File[] entries = fileOrDirectory.listFiles(); for (int i = 0; i < entries.length; i++) { // 递归压缩，更新curPaths zipFileOrDirectory(out, entries[i], curPath + fileOrDirectory.getName() + "/"); } } } catch (IOException ex) { ex.printStackTrace(); // throw ex; } finally { if (in != null) { try { in.close(); } catch (IOException ex) { ex.printStackTrace(); } } } } @SuppressWarnings("unchecked") public static void unzip(String zipFileName, String outputDirectory) throws IOException { ZipFile zipFile = null; try { zipFile = new ZipFile(zipFileName); Enumeration e = zipFile.entries(); ZipEntry zipEntry = null; File dest = new File(outputDirectory); dest.mkdirs(); while (e.hasMoreElements()) { zipEntry = (ZipEntry) e.nextElement(); String entryName = zipEntry.getName(); InputStream in = null; FileOutputStream out = null; try { if (zipEntry.isDirectory()) { String name = zipEntry.getName(); name = name.substring(0, name.length() - 1); File f = new File(outputDirectory + File.separator + name); f.mkdirs(); } else { int index = entryName.lastIndexOf("\\"); if (index != -1) { File df = new File(outputDirectory + File.separator + entryName.substring(0, index)); df.mkdirs(); } index = entryName.lastIndexOf("/"); if (index != -1) { File df = new File(outputDirectory + File.separator + entryName.substring(0, index)); df.mkdirs(); } File f = new File(outputDirectory + File.separator + zipEntry.getName()); // f.createNewFile(); in = zipFile.getInputStream(zipEntry); out = new FileOutputStream(f); int c; byte[] by = new byte[1024]; while ((c = in.read(by)) != -1) { out.write(by, 0, c); } out.flush(); } } catch (IOException ex) { ex.printStackTrace(); throw new IOException("解压失败：" + ex.toString()); } finally { if (in != null) { try { in.close(); } catch (IOException ex) { } } if (out != null) { try { out.close(); } catch (IOException ex) { } } } } } catch (IOException ex) { ex.printStackTrace(); throw new IOException("解压失败：" + ex.toString()); } finally { if (zipFile != null) { try { zipFile.close(); } catch (IOException ex) { } } } } public static void copy(Context myContext, String ASSETS_NAME, String savePath, String saveName) { String filename = savePath + "/" + saveName; File dir = new File(savePath); // 如果目录不中存在，创建这个目录 if (!dir.exists()) dir.mkdir(); try { if (!(new File(filename)).exists()) { InputStream is = myContext.getResources().getAssets() .open(ASSETS_NAME); FileOutputStream fos = new FileOutputStream(filename); byte[] buffer = new byte[7168]; int count = 0; while ((count = is.read(buffer)) > 0) { fos.write(buffer, 0, count); } fos.close(); is.close(); } } catch (Exception e) { e.printStackTrace(); } } public static Boolean CopyAssetsDir(Context context,String src,String des) { //复制安卓Assets下的“非空目录”到des文件夹，注意是否对des有写权限 Boolean isSuccess = true; String[] files; try { files = context.getAssets().list(src); } catch (IOException e1) { return false; } if(files.length==0){ isSuccess = CopyAssetsFile(context,src,des);//对于文件直接复制 if(!isSuccess) return isSuccess; } else{ File srcfile = new File(des+"/"+src); if(!srcfile.exists()){ if(srcfile.mkdirs()){//对于目录自行创建 for(int i=0;i<files.length;i++){//新浪博客的限制，这里的小于号请自行替换为英文的 isSuccess = CopyAssetsDir(context,src + "/"+files[i], des);//递归调用 if(!isSuccess) return isSuccess; } } else{ return false; } } } return isSuccess; } public static Boolean CopyAssetsFile(Context context,String filename, String des) { Boolean isSuccess = true; //复制安卓apk的assets目录下任意路径的单个文件到des文件夹，注意是否对des有写权限 AssetManager assetManager = context.getAssets(); InputStream in = null; OutputStream out = null; try { in = assetManager.open(filename); String newFileName = des + "/" + filename; out = new FileOutputStream(newFileName); byte[] buffer = new byte[1024]; int read; while ((read = in.read(buffer)) != -1) { out.write(buffer, 0, read); } in.close(); in = null; out.flush(); out.close(); out = null; } catch (Exception e) { e.printStackTrace(); isSuccess = false; } return isSuccess; }}文件处理类总结
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