java代码实现ZIP格式解压

二话不说，代码奉上：

import java.io.*;
import java.util.*;
import org.apache.tools.zip.*;

public class AdapterZipFile {
    String zipFileName = null;//zip文件的绝对路径
    String outputDirectory =null;//zip文件解压缩后的存放路径
    ArrayList list = new ArrayList();//文件解压缩后的文件列表绝对路径

//    public AdapterZipFile(String zipFileName) {
//        if(zipFileName == null){
//            return;
//        }
//        this.zipFileName = zipFileName.replace("/","\\");
//        unZipFile();
//    }

    //初始化
    public AdapterZipFile(String zipFileName, String outputDirectory){  //可以实现压缩文件中包含子文件夹的情况
        if(zipFileName == null){
            return;
        }
        this.zipFileName = zipFileName;
        if(outputDirectory != null){
             this.outputDirectory = outputDirectory;
        }else{
            this.outputDirectory = zipFileName.substring(0,
                    zipFileName.replace('\\', '/').lastIndexOf("/"));
        }
       // unZipFile();
    }

   //创建目录
    private void createDirectory(String directory, String subDirectory) {
        String dir[];
        File fl = new File(directory);
        try {
            if (subDirectory == "" && fl.exists() != true)
                fl.mkdirs();
            else if (subDirectory != "") {
                dir = subDirectory.replace("\\","/").split("/");
                for (int i = 0; i < dir.length; i++) {
                    File subFile = new File(directory + File.separator + dir[i]);
                    if (!subFile.exists())
                        subFile.mkdir();
                    directory += File.separator + dir[i];
                }
            }
        }catch (Exception ex) {
            System.out.println(ex.getMessage());
        }
    }

    //解压缩文件
    //如果outputDierctory为null，解压到zipFileName文件的当前目录下
    public void unZipFile() {
        File file = new File(zipFileName);
        if (!file.exists()) {
            return;
        }
        createDirectory(outputDirectory, "");

        try {
            ZipFile zipFile = new ZipFile(zipFileName);
            Enumeration e = zipFile.getEntries();
            ZipEntry zipEntry = null;
            while (e.hasMoreElements()) {
                zipEntry = (ZipEntry) e.nextElement();
                if (zipEntry.isDirectory()) {
                    String name = zipEntry.getName();
                    name = name.substring(0, name.length() - 1);
                    File f = new File(outputDirectory + File.separator + name);
                    f.mkdir();
                } else {
                    String fileName = zipEntry.getName();
                    fileName = fileName.replace('\\', '/');
                    //文件在多层目录下 这时需要创建目录如：d1/d2/1.txt
                    if (fileName.indexOf("/") != -1) {
                        createDirectory(outputDirectory, fileName.substring(0,
                                fileName.lastIndexOf("/")));
                        fileName = fileName.substring(
                                fileName.lastIndexOf("/") + 1, fileName
                                .length());
                    }

                    list.add(outputDirectory + File.separator
                                      + zipEntry.getName());
                    File f = new File(outputDirectory + File.separator
                                      + zipEntry.getName());

                    f.createNewFile();
                    InputStream in = zipFile.getInputStream(zipEntry);
                    FileOutputStream out = new FileOutputStream(f);

                    byte[] by = new byte[1024*1024*6];
                    int c;
                    while ((c = in.read(by)) != -1) {
                        out.write(by, 0, c);
                    }
                    out.close();
                    in.close();
                }
            }
        } catch (Exception ex) {
            System.out.println(ex.getMessage());
        }
    }

   //返回zip文件解压撒后文件列表的绝对路径
    public ArrayList GetZipFileList(){
        return list;
    }
    public static void main(String[] args) {
         AdapterZipFile uzip=new AdapterZipFile("F:/lucene视频和示例.zip","F:/2013");
         long a=System.currentTimeMillis();
         uzip.unZipFile();
         long b=System.currentTimeMillis();
         System.out.println("文件解压耗时"+(b-a) +"毫秒");
    }
}

解压可以根据目标文件的大小，适时的调整缓存流的大小。刚刚测试了下把缓存流设置在1024还是最佳的，解压900MB左右的ZIP文件大概需要22S左右，当然这可能和你自己所用的电脑有一点关系，但是我自己也用了解压软件测试了下，大概在10s左右，这说明上面的代码还是有很大优化的空间的，希望看到这篇博文的同学，可以和我交流下！！！！！一起学习，一起进步！@！！！！