軟體開發工具推薦：ZeroTurnaround ZIP 類庫

    在Java平台上有很多官方的和非官方、第三方的壓縮公用程式包，它們各有各的長處，比如Oracle官方的java.util.zip 類庫，Apache網站上的Apache Commons Compress 類庫，或者Chilkat
Java Zip 類庫，但總體說來，這些類庫提供都是低層級的API，操作起來都不是很方便，而今天推薦給大家的這個叫做ZeroTurnaround(簡稱zt-zip)的壓縮類庫的特點就是方便、簡易，我們可以比較一下，如果用標準的Java類庫壓縮一個目錄裡的所有檔案，你需要寫出的代碼大概是這樣：

File dir = new File("demo");ZipOutputStream out = new ZipOutputStream(new FileOutputStream("demo.zip"));try {  File[] files = dir.listFiles();  for (int i = 0; i < files.length; i++) {    File file = files[i];    ZipEntry entry = new ZipEntry(file.getName());    entry.setSize(file.length());    entry.setTime(file.lastModified());    out.putNextEntry(entry);    FileInputStream in = new FileInputStream(file);    try {      IOUtils.copy(in, out);    }    finally {      IOUtils.closeQuietly(in);    }    out.closeEntry();   } } finally {   IOUtils.closeQuietly(out);}

    而使用 zt-zip 工具包，你的代碼就變成了只有一行：

ZipUtil.pack(new File("demo"), new File("demo.zip"));

　　你不需要自己去關閉檔案的資料流，這個類庫的介面自動替你你做了這些。

　　可能經常做Java壓縮編程的人會提到另外一個壓縮類庫：TrueZIP，這也是一個非常好的類庫，而zt-zip跟它比起來的一個優勢是：消耗記憶體很少，這是因為TrueZIP大量的使用了虛擬機器的堆記憶體，而zt-zip卻是只是以資料流的形式進行操作，當然這也是zt-zip的API提供的功能很有針對性、不是TrueZIP
API那樣通用的原因。

　　你可以在Github上下載這個類庫。

 

Examples

//Unpacking//Check if an entry exists in a ZIP archiveboolean exists = ZipUtil.containsEntry(new File("/tmp/demo"), "foo.txt");//Extract an entry from a ZIP archive into a byte arraybyte[] bytes = ZipUtil.unpackEntry(new File("/tmp/demo.zip"), "foo.txt");//Extract an entry from a ZIP archive into file systemZipUtil.unpackEntry(new File("/tmp/demo.zip"), "foo.txt", new File("/tmp/bar.txt"));//Extract a ZIP archiveZipUtil.unpack(new File("/tmp/demo.zip"), new File("/tmp/demo"));//Extract a ZIP archive which becomes a directoryZipUtil.explode(new File("/tmp/demo.zip"));//Extract a directory from a ZIP archive including the directory nameZipUtil.unpack(new File("/tmp/demo.zip"), new File("/tmp/demo"), new NameMapper() {  public String map(String name) {    return name.startsWith("doc/") ? name : null;  }});//Extract a directory from a ZIP archive excluding the directory namefinal String prefix = "doc/"; ZipUtil.unpack(new File("/tmp/demo.zip"), new File("/tmp/demo"), new NameMapper() {  public String map(String name) {    return name.startsWith(prefix) ? name.substring(prefix.length()) : name;  }});//Print .class entry names in a ZIP archiveZipUtil.iterate(new File("/tmp/demo.zip"), new ZipInfoCallback() {  public void process(ZipEntry zipEntry) throws IOException {    if (zipEntry.getName().endsWith(".class"))      System.out.println("Found " + zipEntry.getName());  }});//Print .txt entries in a ZIP archive (uses IoUtils from Commons IO)ZipUtil.iterate(new File("/tmp/demo.zip"), new ZipEntryCallback() {  public void process(InputStream in, ZipEntry zipEntry) throws IOException {    if (zipEntry.getName().endsWith(".txt")) {      System.out.println("Found " + zipEntry.getName());      IOUtils.copy(in, System.out);    }  }});

 

//Packing//Compress a directory into a ZIP archiveZipUtil.pack(new File("/tmp/demo"), new File("/tmp/demo.zip"));//Compress a directory which becomes a ZIP archiveZipUtil.unexplode(new File("/tmp/demo.zip"));//Compress a directory into a ZIP archive with a parent directoryZipUtil.pack(new File("/tmp/demo"), new File("/tmp/demo.zip"), new NameMapper() {  public String map(String name) {    return "foo/" + name;  }});//Add an entry from file to a ZIP archiveZipUtil.addEntry(new File("/tmp/demo.zip"), "doc/readme.txt", new File("f/tmp/oo.txt"), new File("/tmp/new.zip"));//Add an entry from byte array to a ZIP archiveZipUtil.addEntry(new File("/tmp/demo.zip"), "doc/readme.txt", "bar".getBytes(), new File("/tmp/new.zip"));//Add an entry from file and from byte array to a ZIP archiveZipEntrySource[] entries = new ZipEntrySource[] {    new FileSource("doc/readme.txt", new File("foo.txt")),    new ByteSource("sample.txt", "bar".getBytes())};ZipUtil.addEntries(new File("/tmp/demo.zip"), entries, new File("/tmp/new.zip"));//Replace a ZIP archive entry from fileboolean replaced = ZipUtil.replaceEntry(new File("/tmp/demo.zip"), "doc/readme.txt", new File("/tmp/foo.txt"), new File("/tmp/new.zip"));//Replace a ZIP archive entry from byte arrayboolean replaced = ZipUtil.replaceEntry(new File("/tmp/demo.zip"), "doc/readme.txt", "bar".getBytes(), new File("/tmp/new.zip"));//Replace a ZIP archive entry from file and byte arrayZipEntrySource[] entries = new ZipEntrySource[] {    new FileSource("doc/readme.txt", new File("foo.txt")),    new ByteSource("sample.txt", "bar".getBytes())};boolean replaced = ZipUtil.replaceEntries(new File("/tmp/demo.zip"), entries, new File("/tmp/new.zip"));

 

//Comparison//Compare two ZIP archives (ignoring timestamps of the entries)boolean equals = ZipUtil.archiveEquals(new File("/tmp/demo1.zip"), new File("/tmp/demo2.zip"));//Compare two ZIP archive entries with same name (ignoring timestamps of the entries)boolean equals = ZipUtil.entryEquals(new File("/tmp/demo1.zip"), new File("/tmp/demo2.zip"), "foo.txt");//Compare two ZIP archive entries with different names (ignoring timestamps of the entries)boolean equals = ZipUtil.entryEquals(new File("/tmp/demo1.zip"), new File("/tmp/demo2.zip"), "foo1.txt", "foo2.txt");

 

 

註：本文轉載自：

http://www.aqee.net/development-tools-zt-zip/

https://github.com/zeroturnaround/zt-zip