java解压缩

1. Java实现Zip压缩解压可以使用JDK的原生类java.util.zip，但是JDK 7 之前存在中文文件名乱码问题。
2. 使用 ant.jar 的org.apache.tools.zip包，可以避免乱码问题。
3. 使用专门的压缩解压第三方组件，如zip4j,zt-zip等，这种实现方式当然更强大，不过一般场景用不到，如果只是压缩解压第2种方式足够了。

然而第三种是最简单的哈哈

下面是zt_zip的介绍。

可以看下git：https://github.com/zeroturnaround/zt-zip

也可以看下下面的讲解

 在Java平台上有很多官方的和非官方、第三方的压缩工具包，它们各有各的长处，比如Oracle官方的java.util.zip 类库，Apache网站上的Apache Commons Compress 类库，或者Chilkat Java Zip 类库，但总体说来，这些类库提供都是低级别的API，操作起来都不是很方便，而今天推荐给大家的这个叫做ZeroTurnaround(简称zt-zip)的压缩类库的特点就是方便、简易，我们可以比较一下，如果用标准的Java类库压缩一个目录里的所有文件，你需要写出的代码大概是这样：

 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，你的代码就变成了只有一行：

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

　　你不需要自己去关闭文件的数据流，这个类库的接口自动替你你做了这些。

　　可能经常做Java压缩编程的人会提到另外一个压缩类库：TrueZIP，这也是一个非常好的类库，而zt-zip跟它比起来的一个优势是：消耗内存很少，这是因为TrueZIP大量的使用了虚拟机的堆内存，而zt-zip却是只是以数据流的形式进行操作，当然这也是zt-zip的API提供的功能很有针对性、不是TrueZIP API那样通用的原因。

　　你可以在Github上下载这个类库。

 

Examples

 //Unpacking

 //Check if an entry exists in a ZIP archive
 boolean exists = ZipUtil.containsEntry(new File("/tmp/demo"), "foo.txt");
 //Extract an entry from a ZIP archive into a byte array
 byte[] bytes = ZipUtil.unpackEntry(new File("/tmp/demo.zip"), "foo.txt");
 //Extract an entry from a ZIP archive into file system
 ZipUtil.unpackEntry(new File("/tmp/demo.zip"), "foo.txt", new File("/tmp/bar.txt"));
 //Extract a ZIP archive
 ZipUtil.unpack(new File("/tmp/demo.zip"), new File("/tmp/demo"));
 //Extract a ZIP archive which becomes a directory
 ZipUtil.explode(new File("/tmp/demo.zip"));
 //Extract a directory from a ZIP archive including the directory name
 ZipUtil.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 name
 final 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 archive
 ZipUtil.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 archive
 ZipUtil.pack(new File("/tmp/demo"), new File("/tmp/demo.zip"));
 //Compress a directory which becomes a ZIP archive
 ZipUtil.unexplode(new File("/tmp/demo.zip"));
 //Compress a directory into a ZIP archive with a parent directory
 ZipUtil.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 archive
 ZipUtil.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 archive
 ZipUtil.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 archive
 ZipEntrySource[] 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 file
 boolean 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 array
 boolean 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 array
 ZipEntrySource[] 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");

 

 

注：本文转载自：

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

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