java——操作文件
Java文件操作，共实现了文件复制（单个文件和多层目录文件），文件移动（单个文件和多层目录文件），文件删除（单个文件和多层目录文件），文件压缩 （单个文件），文件解压（单个文件），文件分割（将一个大文件分割为若干个小文件），文件组合（将多个文件组合到一个文件中）。
package ttstudy.io;
import java.io.*;
import java.util.*;
import java.util.zip.*;
public class FileManager {
private static ArrayList<File> lsFiles = new ArrayList<File>();
private static FileInputStream fis = null;
private static FileOutputStream fos = null;
/**
* list all files
* @param path
* @return ArrayList<File>
* @throws FileNotFoundException
*/
public static ArrayList<File> listAllFiles(String path) throws FileNotFoundException {
File file = new File(path);
File[] f = file.listFiles();
for(int i=0; i<f.length; i++) {
lsFiles.add(f[i]);
//If the current file is a directory, Recursion listed catalogue of the files
if(f[i].isDirectory()) {
listAllFiles(f[i].getAbsolutePath());
}
}
return lsFiles;
}
/**
* copy srcFile to desFile
* @param srcFile
* @param desFile
* @throws FileNotFoundException
*/
public static void copyFile(String srcFile, String desFile) throws FileNotFoundException, IOException {
fis = new FileInputStream(new File(srcFile));
fos = new FileOutputStream(new File(desFile));
byte[] buf = new byte[1024];
int len = 0;
while((len=fis.read(buf)) != -1) {
fos.write(buf, 0, len);
}
fos.close();
fis.close();
}
/**
* copy all files in srcFile to desFile
* @param srcFile
* @param desFile
* @throws FileNotFoundException
*/
public static void copyFiles(String srcFile, String desFile) throws FileNotFoundException, IOException {
ArrayList<File> lsFiles = listAllFiles(srcFile);
for(int i=0; i<lsFiles.size(); i++) {
File curFile = lsFiles.get(i);
if(curFile.isDirectory()) {
new File(desFile+curFile.getAbsolutePath().substring(srcFile.length())).mkdir();
} else {
copyFile(curFile.getAbsolutePath(), new File(desFile+curFile.getAbsolutePath().substring(srcFile.length())).getAbsolutePath());
}
}
}
/**
* Split a file into multiple files
* @param srcFile
* @param desDir 分割后文件存放的位置，是一个目录
* @param n
* @return
* @throws FileNotFoundException
*/
public static File[] splitFile(String srcFile, String desDir, int part) throws FileNotFoundException, IOException {
File[] rsFile = new File[part];
File f = new File(srcFile);
long partLen = f.length()/part; //part等分
int perLen = 2;
if(partLen > 1024) {
perLen = 512;
} else {
perLen = 2;
}
byte[] buf = new byte[perLen];
fis = new FileInputStream(f);
for(int i=0; i<part; i++) {
int pos = f.getName().lastIndexOf('.');
File partFile = new File(desDir+"/"+f.getName().substring(0, pos)+(i+1)+f.getName().substring(pos));
fos = new FileOutputStream(partFile);
rsFile[i] = partFile;
long m = partLen/perLen;
for(int j=0; j<m; j++) {
int len = 0;
if((len=fis.read(buf)) != -1) {
fos.write(buf, 0, len);
}
}
}
//由于整除原因，可能导致最后一部分没有写入到文件中，因此需要补充下面内容
int nn= 0;
if((nn=fis.read(buf)) != -1) {
fos.write(buf, 0, nn);
}
fos.close();
fis.close();
return rsFile;
}
/**
* Combination of multiple files into one file
* @param srcFile
* @param desFile
* @return
* @throws FileNotFoundException
* @throws IOException
*/
public static File mergeFile(File[] srcFile, String desFile) throws FileNotFoundException, IOException {
File rsFile = new File(desFile);
fos = new FileOutputStream(new File(desFile));
byte[] buf = new byte[1024];
int len = 0;
for(int i=0; i<srcFile.length; i++) {
fis = new FileInputStream(srcFile[i]);
while((len=fis.read(buf)) != -1) {
fos.write(buf, 0, len);
}
fis.close();
}
if(fos != null) {
fos.close();
}
if(fis != null) {
fis.close();
}
return rsFile;
}
/**
* delete a file
* @param srcFile
* @throws FileNotFoundException
* @throws IOException
*/
public static void deleteFile(String srcFile) throws FileNotFoundException, IOException {
new File(srcFile).delete();
}
/**
* Delete all files in srcFile,This is too difficult for me
* @param srcFile
* @throws FileNotFoundException
* @throws IOException
*/
public static void deleteFiles(String srcFile) throws FileNotFoundException, IOException {
LinkedList<File> dirs = new LinkedList<File>();
dirs.add(new File(srcFile));
while(dirs.size() > 0){
File currentDir = (File)dirs.getFirst();
File[] files = currentDir.listFiles();
boolean emptyDir = true;
for(int i = 0 ;i < files.length;i++) {
if (files[i].isFile()) {
files[i].delete();
} else {
dirs.addFirst(files[i]);
emptyDir = false;
}
}
if (emptyDir){
currentDir.delete();
dirs.removeFirst();
}
}
}
/**
* move srcFile to desFile
* @param srcFile
* @param desFile
* @throws FileNotFoundException
*/
public static void moveFile(String srcFile, String desFile) throws FileNotFoundException, IOException {
copyFile(srcFile, desFile);
new File(srcFile).delete();
}
/**
* move srcFile to desFile
* @param srcFile
* @param desFile
* @throws FileNotFoundException
*/
public static void moveFiles(String srcFile, String desFile) throws FileNotFoundException, IOException {
copyFiles(srcFile, desFile);
deleteFiles(srcFile);
}
/**
* compress files
* @param srcFile
* @param rarFile
* @throws FileNotFoundException
* @throws IOException
*/
public static void compressFile(String _unZipFile, String _zipFile) throws FileNotFoundException, IOException {
File srcFile = new File(_unZipFile);
File zipFile = new File(_zipFile);
DataInputStream dis = new DataInputStream(new FileInputStream(srcFile));
if(!zipFile.exists()) {
File zipdir = new File(zipFile.getParent());
if(!zipdir.exists()) {
zipdir.mkdirs();
}
zipFile.createNewFile();
}
ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(zipFile));
zos.setMethod(ZipOutputStream.DEFLATED);
ZipEntry ze = new ZipEntry(srcFile.getName());
zos.putNextEntry(ze);
DataOutputStream dos = new DataOutputStream(zos);
byte[] buf = new byte[2048];
int len=0;
while((len=dis.read(buf)) != -1) {
dos.write(buf, 0, len);
}
dos.close();
dis.close();
}
/**
* uncompress files
* @param rarFile
* @param srcFile
* @throws FileNotFoundException
* @throws IOException
*/
@SuppressWarnings("unchecked")
public static void unCompressFile(String _zipFile, String _unZipDir) throws FileNotFoundException, IOException {
File unZipFile = new File("_unZipFile");
if(! unZipFile.exists()) {
unZipFile.mkdirs();
}
ZipEntry ze = null;
ZipFile zf = new ZipFile(new File(_zipFile));
Enumeration<ZipEntry> en = (Enumeration<ZipEntry>)zf.entries();
if(en.hasMoreElements()) {
ze = (ZipEntry)en.nextElement();
}
unZipFile = new File(_unZipDir+File.separator+ze.getName());
if(! unZipFile.exists()) {
unZipFile.createNewFile();
}
DataInputStream dis = new DataInputStream(zf.getInputStream(ze));
DataOutputStream dos = new DataOutputStream(new FileOutputStream(unZipFile));
int len = 0;
byte[] buf = new byte[2048];
while((len=dis.read(buf)) != -1) {
dos.write(buf, 0, len);
}
dos.close();
dis.close();
}
/**
*
* @param args
*/
public static void main(String[] args) throws FileNotFoundException, IOException {
// ArrayList<File> lsFiles = listAllFiles("D:/temp");
// for(int i=0; i<lsFiles.size(); i++) {
// System.out.println(lsFiles.get(i).getPath());
// }
// System.out.println(lsFiles.size());
// //copyFile("D:/temp/我的桌面.jpg","D:/temp/test.jpg");
// try {
// copyFiles("D:/temp","D:/tt");
// } catch (IOException e) {
// // TODO Auto-generated catch block
// e.printStackTrace();
// }
// //moveFile("D:/temp/我的桌面.jpg","D:/temp/test.jpg");
//moveFiles("D:/ttt","D:/temp");
// File f = new File("D:/temp/软件0820 9308036 .王颜涛.doc");
// System.out.println(f.getName());
// try {
// splitFile("D:/temp/tttt.rar", "D:/temp/test", 3);
// } catch (IOException e) {
// e.printStackTrace();
// }
// File[] f = {new File("D:/temp/test/tttt1.rar"), new File("D:/temp/test/tttt2.rar"), new File("D:/temp/test/tttt3.rar")};
// try {
// mergeFile(f, "D:/temp/test.rar");
// } catch (IOException e) {
// // TODO Auto-generated catch block
// e.printStackTrace();
// }
//deleteFiles("D:/temp/tttt");
compressFile("D:/temp/bb.pdf","D:/temp/bb.rar");
//unCompressFile("D:/temp/test.rar","D:/temp/test2");
}
}