通过java实现解压zip，rar的代码

package com.zuidaima.main;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URL;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

import com.github.junrar.Archive;
import com.github.junrar.exception.RarException;
import com.github.junrar.rarfile.FileHeader;

/**
**/
public class Main {

public void extractZipFiles() {
String root ="c:/javazip/";
URL url = Main.class.getResource("/aa.zip");
String filename = url.getFile();
try {
// destination folder to extract the contents
byte[] buf = new byte[1024];
ZipInputStream zipinputstream = null;
ZipEntry zipentry;
zipinputstream = new ZipInputStream(new FileInputStream(filename));
zipentry = zipinputstream.getNextEntry();
while (zipentry != null) {

// for each entry to be extracted
String entryName = zipentry.getName();

System.out.println(entryName);

int n;
FileOutputStream fileoutputstream;
File newFile = new File(entryName);

String directory = newFile.getParent();

// to creating the parent directories
if (directory == null) {
if (newFile.isDirectory()) {
break;
}
} else {
new File(root + directory).mkdirs();
}

if (!zipentry.isDirectory()) {
System.out.println("File to be extracted....."+ entryName);
fileoutputstream = new FileOutputStream(root + entryName);
while ((n = zipinputstream.read(buf, 0, 1024)) > -1) {
fileoutputstream.write(buf, 0, n);
}
fileoutputstream.close();
}

zipinputstream.closeEntry();
zipentry = zipinputstream.getNextEntry();
}
zipinputstream.close();
} catch (Exception e) {
e.printStackTrace();
}
}

public void extractRarFiles() {
URL url = Main.class.getResource("/bb.rar");
String filename = url.getFile();
File archive = new File(filename);
File destination = new File("c:/javazip/");

Archive arch = null;
try {
arch = new Archive(archive);
} catch (RarException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
if (arch != null) {
if (arch.isEncrypted()) {
System.out.println("archive is encrypted cannot extreact");
return;
}
FileHeader fh = null;
while (true) {
fh = arch.nextFileHeader();
if (fh == null) {
break;
}
if (fh.isEncrypted()) {
System.out.println("file is encrypted cannot extract:"
+ fh.getFileNameString());
continue;
}
System.out.println("extracting:"+ fh.getFileNameString());
try {
if (fh.isDirectory()) {
createDirectory(fh, destination);
} else {
File f = createFile(fh, destination);
OutputStream stream = new FileOutputStream(f);
arch.extractFile(fh, stream);
stream.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}

private File createFile(FileHeader fh, File destination) {
File f = null;
String name = null;
if (fh.isFileHeader() && fh.isUnicode()) {
name = fh.getFileNameW();
} else {
name = fh.getFileNameString();
}
f = new File(destination, name);
if (!f.exists()) {
try {
f = makeFile(destination, name);
} catch (IOException e) {
e.printStackTrace();
}
}
return f;
}

private File makeFile(File destination, String name) throws IOException {
String[] dirs = name.split("");
if (dirs == null) {
return null;
}
String path ="";
int size = dirs.length;
if (size == 1) {
return new File(destination, name);
} else if (size > 1) {
for (int i = 0; i < dirs.length - 1; i++) {
path = path + File.separator + dirs[i];
new File(destination, path).mkdir();
}
path = path + File.separator + dirs[dirs.length - 1];
File f = new File(destination, path);
f.createNewFile();
return f;
} else {
return null;
}
}

private void createDirectory(FileHeader fh, File destination) {
File f = null;
if (fh.isDirectory() && fh.isUnicode()) {
f = new File(destination, fh.getFileNameW());
if (!f.exists()) {
makeDirectory(destination, fh.getFileNameW());
}
} else if (fh.isDirectory() && !fh.isUnicode()) {
f = new File(destination, fh.getFileNameString());
if (!f.exists()) {
makeDirectory(destination, fh.getFileNameString());
}
}
}

private void makeDirectory(File destination, String fileName) {
String[] dirs = fileName.split("");
if (dirs == null) {
return;
}
String path ="";
for (String dir : dirs) {
path = path + File.separator + dir;
new File(destination, path).mkdir();
}
}

public static void main(String[] args) {
Main main = new Main();
// extract zip
main.extractZipFiles();
// extract rar
main.extractRarFiles();
}
}