java zip

 

private void unzip() {
		int BUFFER = 2048;

		try {
			String fileName = "C:/img1.zip";
			String filePath = "C:/";
			ZipFile zipFile = new ZipFile(fileName);
			Enumeration emu = zipFile.getEntries();
			while (emu.hasMoreElements()) {
				ZipEntry entry = (ZipEntry) emu.nextElement();
				// 会把目录作为一个file读出一次，所以只建立目录就可以，之下的文件还会被迭代到。
				if (entry.isDirectory()) {
					new File(filePath + entry.getName()).mkdirs();
					continue;
				}
				BufferedInputStream bis = new BufferedInputStream(
						zipFile.getInputStream(entry));

				File file = new File(filePath + entry.getName());
				// 加入这个的原因是zipfile读取文件是随机读取的，这就造成可能先读取一个文件
				// 而这个文件所在的目录还没有出现过，所以要建出目录来。
				File parent = file.getParentFile();
				if (parent != null && (!parent.exists())) {
					parent.mkdirs();
				}
				FileOutputStream fos = new FileOutputStream(file);
				BufferedOutputStream bos = new BufferedOutputStream(fos, BUFFER);

				int count;
				byte data[] = new byte[BUFFER];
				while ((count = bis.read(data, 0, BUFFER)) != -1) {
					bos.write(data, 0, count);
				}
				bos.flush();
				bos.close();
				bis.close();
			}
			zipFile.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

从 http://ant.apache.org/bindownload.cgi 下载apache-ant-1.8.2-bin.zip，将ant.jar加到编译路径，然后:

import org.apache.tools.zip.ZipEntry;

import org.apache.tools.zip.ZipFile;

mport java.io.*; 
import org.apache.tools.zip.*; 
import java.util.Enumeration; 
/** 
*功能:zip压缩、解压(支持中文文件名) 
*说明:本程序通过使用Apache Ant里提供的zip工具org.apache.tools.zip实现了zip压缩和解压功能. 
*   解决了由于java.util.zip包不支持汉字的问题。 
*   使用java.util.zip包时,当zip文件中有名字为中文的文件时, 
*   就会出现异常:"Exception  in thread "main " java.lang.IllegalArgumentException  
*               at   java.util.zip.ZipInputStream.getUTF8String(ZipInputStream.java:285) 
*注意: 
*   1、使用时把ant.jar放到classpath中,程序中使用import org.apache.tools.zip.*; 
*   2、Apache Ant 下载地址:[url]http://ant.apache.org/[/url] 
*   3、Ant ZIP API:[url]http://www.jajakarta.org/ant/ant-1.6.1/docs/mix/manual/api/org/apache/tools/zip/[/url] 
*   4、本程序使用Ant 1.7.1 中的ant.jar 
* 
*仅供编程学习参考. 
* 
*@author Winty 
*@date   2008-8-3 
*@Usage: 
*   压缩:java AntZip -zip "directoryName" 
*   解压:java AntZip -unzip "fileName.zip" 
*/ 

public class AntZip{ 
    private ZipFile         zipFile; 
    private ZipOutputStream zipOut;     //压缩Zip 
    private ZipEntry        zipEntry; 
    private static int      bufSize;    //size of bytes 
    private byte[]          buf; 
    private int             readedBytes; 
     
    public AntZip(){ 
        this(512); 
    } 

    public AntZip(int bufSize){ 
        this.bufSize = bufSize; 
        this.buf = new byte[this.bufSize]; 
    } 
     
    //压缩文件夹内的文件 
    public void doZip(String zipDirectory){//zipDirectoryPath:需要压缩的文件夹名 
        File file; 
        File zipDir; 

        zipDir = new File(zipDirectory); 
        String zipFileName = zipDir.getName() + ".zip";//压缩后生成的zip文件名 

        try{ 
            this.zipOut = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipFileName))); 
            handleDir(zipDir , this.zipOut); 
            this.zipOut.close(); 
        }catch(IOException ioe){ 
            ioe.printStackTrace(); 
        } 
    } 

    //由doZip调用,递归完成目录文件读取 
    private void handleDir(File dir , ZipOutputStream zipOut)throws IOException{ 
        FileInputStream fileIn; 
        File[] files; 

        files = dir.listFiles(); 
     
        if(files.length == 0){//如果目录为空,则单独创建之. 
            //ZipEntry的isDirectory()方法中,目录以"/"结尾. 
            this.zipOut.putNextEntry(new ZipEntry(dir.toString() + "/")); 
            this.zipOut.closeEntry(); 
        } 
        else{//如果目录不为空,则分别处理目录和文件. 
            for(File fileName : files){ 
                //System.out.println(fileName); 

                if(fileName.isDirectory()){ 
                    handleDir(fileName , this.zipOut); 
                } 
                else{ 
                    fileIn = new FileInputStream(fileName); 
                    this.zipOut.putNextEntry(new ZipEntry(fileName.toString())); 

                    while((this.readedBytes = fileIn.read(this.buf))>0){ 
                        this.zipOut.write(this.buf , 0 , this.readedBytes); 
                    } 

                    this.zipOut.closeEntry(); 
                } 
            } 
        } 
    } 

    //解压指定zip文件 
    public void unZip(String unZipfileName){//unZipfileName需要解压的zip文件名 
        FileOutputStream fileOut; 
        File file; 
        InputStream inputStream; 

        try{ 
            this.zipFile = new ZipFile(unZipfileName); 

            for(Enumeration entries = this.zipFile.getEntries(); entries.hasMoreElements();){ 
                ZipEntry entry = (ZipEntry)entries.nextElement(); 
                file = new File(entry.getName()); 

                if(entry.isDirectory()){ 
                    file.mkdirs(); 
                } 
                else{ 
                    //如果指定文件的目录不存在,则创建之. 
                    File parent = file.getParentFile(); 
                    if(!parent.exists()){ 
                        parent.mkdirs(); 
                    } 

                    inputStream = zipFile.getInputStream(entry); 

                    fileOut = new FileOutputStream(file); 
                    while(( this.readedBytes = inputStream.read(this.buf) ) > 0){ 
                        fileOut.write(this.buf , 0 , this.readedBytes ); 
                    } 
                    fileOut.close(); 

                    inputStream.close(); 
                }    
            } 
            this.zipFile.close(); 
        }catch(IOException ioe){ 
            ioe.printStackTrace(); 
        } 
    } 

    //设置缓冲区大小 
    public void setBufSize(int bufSize){ 
        this.bufSize = bufSize; 
    } 

    //测试AntZip类 
    public static void main(String[] args)throws Exception{ 
        if(args.length==2){ 
            String name = args[1]; 
            AntZip zip = new AntZip(); 

            if(args[0].equals("-zip")) 
                zip.doZip(name); 
            else if(args[0].equals("-unzip")) 
                zip.unZip(name); 
        } 
        else{ 
            System.out.println("Usage:"); 
            System.out.println("压缩:java AntZip -zip directoryName"); 
            System.out.println("解压:java AntZip -unzip fileName.zip"); 
            throw new Exception("Arguments error!"); 
        } 
    } 
}

转自：http://wintys.blog.51cto.com/425414/90878