关于java解压zip与rar的问题

     这两天,因为项目需要,涉及到文件夹的上传,想了很久,在网上也找了一些资料,都没有什么很好的办法,都是用插件之类的解决,后面就想到了上传压缩文件,说到压缩文件,自然就会遇到,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(从http://topic.csdn.net/u/20090227/11/fd8c30ee-ce56-49be-bdea-d19d22a0da37.html转载,供大家一起享用,另外希望对unrar有比较发解的朋友,能发表一个人见解),

    

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;

import de.innosystec.unrar.Archive;

/** 
 *  *  
 * @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
        }
    }}

 (下面附ant,unrar相关的jar包)

评论

2 楼 mbyd 2011-08-10  

引用

[align=right][/align]

1 楼 wofeng 2010-11-07  

   

            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();  

Archive 没有这些方法吧。
-------------------------------
在linux下 用java-unrar 会乱码，能研究一下吗？