关于java解压zip与rar的问题

因为想用rar的解压缩在8100上,文件的解压缩问题,大家都知道,比较常见的压缩文件有rar,zip,然而rar,zip的区别又在哪?说一点,zip 压缩算法是免费开放的，任何人可以免费使用。但是 RAR 就不一样了，
这个压缩算法已经受到专利权的保护，如果要使用 RAR 算法必须向其专利所有人支付费用。所以在一般的开源网站,像apache,sourceforge等开源网站上的开源项目一般都用zip格式.本人所学语言主要为java自然会想用java去解压,用java去解压zip比较容易,有apache提供的开源项目ant,我在网上找一下,找到了sourceforge的开源项目unrar专用于压缩,解压rar.只可惜没有文档(让人即喜,又悲).

下面是一个对zip,rar进行解压的程序

Java代码

import org.apache.tools.tar.TarEntry;
import org.apache.tools.tar.TarOutputStream;
import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipFile;
import org.apache.tools.zip.ZipOutputStream;

Java代码

import de.innosystec.unrar.Archive;

Java代码

/**
* *
* @version 创建时间：Feb 26, 2009 6:01:11 PM
* 类说明:压缩、解压文件公用类
*
*/
public class Decompression {
private static final int BUFFEREDSIZE = 1024;
/**
* 解压zip格式的压缩文件到指定位置
* @param zipFileName 压缩文件
* @param extPlace 解压目录
* @throws Exception
*/
@SuppressWarnings("unchecked")
public synchronized void unzip(String zipFileName, String extPlace) throws Exception {
try {
(new File(extPlace)).mkdirs();
File f = new File(zipFileName);
ZipFile zipFile = new ZipFile(zipFileName);
if((!f.exists()) && (f.length() <= 0)) {
throw new Exception("要解压的文件不存在!");
}
String strPath, gbkPath, strtemp;
File tempFile = new File(extPlace);
strPath = tempFile.getAbsolutePath();
java.util.Enumeration e = zipFile.getEntries();
while(e.hasMoreElements()){
org.apache.tools.zip.ZipEntry zipEnt = (ZipEntry) e.nextElement();
gbkPath=zipEnt.getName();
if(zipEnt.isDirectory()){
strtemp = strPath + File.separator + gbkPath;
File dir = new File(strtemp);
dir.mkdirs();
continue;
} else {
//读写文件
InputStream is = zipFile.getInputStream(zipEnt);
BufferedInputStream bis = new BufferedInputStream(is);
gbkPath=zipEnt.getName();
strtemp = strPath + File.separator + gbkPath;
//建目录
String strsubdir = gbkPath;
for(int i = 0; i < strsubdir.length(); i++) {
if(strsubdir.substring(i, i + 1).equalsIgnoreCase("/")) {
String temp = strPath + File.separator + strsubdir.substring(0, i);
File subdir = new File(temp);
if(!subdir.exists())
subdir.mkdir();
}
}
FileOutputStream fos = new FileOutputStream(strtemp);
BufferedOutputStream bos = new BufferedOutputStream(fos);
int c;
while((c = bis.read()) != -1) {
bos.write((byte) c);
}
bos.close();
fos.close();
}
}
} catch(Exception e) {
e.printStackTrace();
throw e;
}
}
/**
* 解压zip格式的压缩文件到指定位置
* @param zipFileName 压缩文件
* @param extPlace 解压目录
* @throws Exception
*/
@SuppressWarnings("unchecked")
public synchronized void unzip(String zipFileName, String extPlace,boolean whether) throws Exception {
try {
(new File(extPlace)).mkdirs();
File f = new File(zipFileName);
ZipFile zipFile = new ZipFile(zipFileName);
if((!f.exists()) && (f.length() <= 0)) {
throw new Exception("要解压的文件不存在!");
}
String strPath, gbkPath, strtemp;
File tempFile = new File(extPlace);
strPath = tempFile.getAbsolutePath();
java.util.Enumeration e = zipFile.getEntries();
while(e.hasMoreElements()){
org.apache.tools.zip.ZipEntry zipEnt = (ZipEntry) e.nextElement();
gbkPath=zipEnt.getName();
if(zipEnt.isDirectory()){
strtemp = strPath + File.separator + gbkPath;
File dir = new File(strtemp);
dir.mkdirs();
continue;
} else {
//读写文件
InputStream is = zipFile.getInputStream(zipEnt);
BufferedInputStream bis = new BufferedInputStream(is);
gbkPath=zipEnt.getName();
strtemp = strPath + File.separator + gbkPath;
//建目录
String strsubdir = gbkPath;
for(int i = 0; i < strsubdir.length(); i++) {
if(strsubdir.substring(i, i + 1).equalsIgnoreCase("/")) {
String temp = strPath + File.separator + strsubdir.substring(0, i);
File subdir = new File(temp);
if(!subdir.exists())
subdir.mkdir();
}
}
FileOutputStream fos = new FileOutputStream(strtemp);
BufferedOutputStream bos = new BufferedOutputStream(fos);
int c;
while((c = bis.read()) != -1) {
bos.write((byte) c);
}
bos.close();
fos.close();
}
}
} catch(Exception e) {
e.printStackTrace();
throw e;
}
}
/**
* 压缩zip格式的压缩文件
* @param inputFilename 压缩的文件或文件夹及详细路径
* @param zipFilename 输出文件名称及详细路径
* @throws IOException
*/
public synchronized void zip(String inputFilename, String zipFilename) throws IOException {
zip(new File(inputFilename), zipFilename);
}
/**
* 压缩zip格式的压缩文件
* @param inputFile 需压缩文件
* @param zipFilename 输出文件及详细路径
* @throws IOException
*/
public synchronized void zip(File inputFile, String zipFilename) throws IOException {
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFilename));
try {
zip(inputFile, out, "");
} catch (IOException e) {
throw e;
} finally {
out.close();
}
}
/**
* 压缩zip格式的压缩文件
* @param inputFile 需压缩文件
* @param out 输出压缩文件
* @param base 结束标识
* @throws IOException
*/
@SuppressWarnings("unused")
private synchronized void zip(File inputFile, ZipOutputStream out, String base) throws IOException {
if (inputFile.isDirectory()) {
File[] inputFiles = inputFile.listFiles();
out.putNextEntry(new ZipEntry(base + "/"));
base = base.length() == 0 ? "" : base + "/";
for (int i = 0; i < inputFiles.length; i++) {
zip(inputFiles[i], out, base + inputFiles[i].getName());
}
} else {
if (base.length() > 0) {
out.putNextEntry(new ZipEntry(base));
} else {
out.putNextEntry(new ZipEntry(inputFile.getName()));
}
FileInputStream in = new FileInputStream(inputFile);
try {
int c;
byte[] by = new byte[BUFFEREDSIZE];
while ((c = in.read(by)) != -1) {
out.write(by, 0, c);
}
} catch (IOException e) {
throw e;
} finally {
in.close();
}
}
}
/**
* 解压rar格式的压缩文件到指定目录下
* @param rarFileName 压缩文件
* @param extPlace 解压目录
* @throws Exception
*/
public synchronized void unrar(String rarFileName, String extPlace) throws Exception{
try {
(new File(extPlace)).mkdirs();
// 构建测解压缩类
Archive archive = new Archive();
archive.setEnabledLog(false); //不输出日志
// 设置rar文件
archive.setFile(rarFileName);
archive.setExtractPath(extPlace);
archive.extractAllFile();
} catch (Exception e) {
// TODO: handle exception
}
}}

Java代码

(下面附ant,unrar相关的jar包)

java-unrar.zip (505.9 KB)
描述: (解压rar所需的jar包)
下载次数: 109
ant.jar (1.2 MB)
描述: 用于解压zip的jar包
下载次数: 70

，

posted @ 2010-01-13 14:25 shenhaocn 阅读(6101) 评论(2) 收藏举报

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