util之解压ZIP工具类

package com.***.tools;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

/**
 * 解压zip文件
 */
public final class ZipUtil {
    private static final int buffer = 2048;

    /**
     * 解压Zip文件
     * @param path zip文件目录
     */
    public static void unZip(String path) {
        int count = -1;
        String savepath = "";

        File file = null;
        InputStream is = null;
        FileOutputStream fos = null;
        BufferedOutputStream bos = null;

        savepath = path.substring(0, path.lastIndexOf(".")) + File.separator; // 保存解压文件目录
        new File(savepath).mkdir(); // 创建保存目录
        ZipFile zipFile = null;
        try {
            zipFile = new ZipFile(path,Charset.forName("GBK")); // 解决中文乱码问题
            Enumeration<?> entries = zipFile.entries();  //枚举ZIP中的所有文件

            while (entries.hasMoreElements()) {
                byte buf[] = new byte[buffer];

                ZipEntry entry = (ZipEntry) entries.nextElement();

                String filename = entry.getName();  //获取文件名
                filename = savepath + filename;
                boolean ismkdir = false;
                if (filename.lastIndexOf("/") != -1) { // 检查此文件是否带有文件夹
                    ismkdir = true;
                }

                if (entry.isDirectory()) { // 如果此枚举文件是文件夹则创建,并且遍历下一个
                    file = new File(filename);
                    file.mkdirs();
                    continue;
                }
                file = new File(filename);  //此枚举文件不是目录
                if (!file.exists()) {  //如果文件不存在并且文件带有目录
                    if (ismkdir) {
                        new File(filename.substring(0, filename
                                .lastIndexOf("/"))).mkdirs(); // 先创建目录
                    }
                }
                file.createNewFile(); //再创建文件

                is = zipFile.getInputStream(entry);
                fos = new FileOutputStream(file);
                bos = new BufferedOutputStream(fos, buffer);

                while ((count = is.read(buf)) > -1) {
                    bos.write(buf, 0, count);
                }
                bos.flush();
            }
        } catch (IOException ioe) {
            ioe.printStackTrace();
        } finally {
            try {
                if (bos != null) {
                    bos.close();
                }
                if (fos != null) {
                    fos.close();
                }
                if (is != null) {
                    is.close();
                }
                if (zipFile != null) {
                    zipFile.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}