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标题:
Java版的WinRAR工具
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作者:
之乎者烨
时间:
2009-3-17 08:14
标题:
Java版的WinRAR工具
最近做个东西,需要强大的Java版压缩组建支持,可惜没有开源的,最后实在没办法了。决定自己实现个,反正JDK中提供了最基础的API. 标题说WinRAR工具,夸大了,还没WinRAR那么强大,仅仅是一个zip工具组建,没有GUI界面,只有工具方法。
目标:
实现一个像WinRAR、WinZip一样可以同时混合压缩或者解压缩文件和文件夹的工具。目前仅支持zip文件,因为SUN Java API仅支持zip和gzip两种格式,gzip就像玩具枪,不中用,就不说了,下面是实现代码。
实现:
寥寥不到百行代码就搞定了,难点在于一个递归算法。 import java.io.*; import java.util.Collection; import java.util.Enumeration; import java.util.zip.ZipEntry; import java.util.zip.ZipFile; import java.util.zip.ZipOutputStream; //import org.apache.tools.zip.ZipEntry; //import org.apache.tools.zip.ZipOutputStream; /** * Java版的Zip工具 * * @author leizhimin 2008-11-27 11:16:05 */ 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 当压缩过程出错时抛出 */ public static void upZipFile(File zipFile, String folderPath) throws IOException { ZipFile zf = new ZipFile(zipFile); for (Enumeration entries = zf.entries(); entries.hasMoreElements();) { ZipEntry entry = ((ZipEntry) entries.nextElement()); InputStream in = zf.getInputStream(entry); OutputStream out = new FileOutputStream(folderPath File.separator entry.getName()); byte buffer[] = new byte[BUFF_SIZE]; int realLength; while ((realLength = in.read(buffer)) > 0) { out.write(buffer, 0, realLength); } in.close(); out.close(); } } private static void zipFile(File resFile, ZipOutputStream zipout, String rootpath) throws IOException { rootpath = rootpath (rootpath.trim().length() == 0 ? "" : File.separator) resFile.getName(); 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(); } } }
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测试代码: public class Test { public static void main(String[] args) throws IOException { Collection<File> resFileList = new ArrayList<File>(); resFileList.add(new File("C:\\new.gif")); resFileList.add(new File("C:\\HelloWorld.java")); resFileList.add(new File("C:\\crebas.sql")); resFileList.add(new File("E:\\log.log")); resFileList.add(new File("C:\\ooo\\upx\\")); File zipFile = new File("C:\\txxxt.zip"); ZipUtils.zipFiles(resFileList, zipFile); } } 运行结果: 压缩成功! Process finished with exit code 0 查看硬盘的上压缩文件,没错,贴个图看看:
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呵呵,经过查看,没问题,就是注释乱码。 经过反复测试,发现中文支持有问题。 google了一下解决方案,用ant包中的两个类 //import org.apache.tools.zip.ZipEntry; //import org.apache.tools.zip.ZipOutputStream; 替换Java包的对应的两个类 import java.util.zip.ZipFile; import java.util.zip.ZipOutputStream; 即可完美支持中文。
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