java 文件压缩

package com.bestway.bcus.client.checkstock;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

public class ZipUtil {

    /**
     * 压缩目录下的文件
     * 
     * @param zipFileName
     * @param inputFile
     *            目录
     * @throws java.lang.Exception
     */
    public void zip(String zipFileName, String inputFile) throws Exception {
        zip(zipFileName, new File(inputFile));
    }

    /**
     * 压缩文件
     * 
     * @param zipFileName
     * @param inputFile
     *            文件
     * @throws java.lang.Exception
     */
    public void zip(String zipFileName, File inputFile) throws Exception {
        ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
                zipFileName));
        zip(out, inputFile, "");
        System.out.println("压缩成功!");
        out.close();
    }

    public void zip(ZipOutputStream out, File f, String base) throws Exception {
        System.out.println("正在压缩  " + f.getName());
        if (f.isDirectory()) {
            File[] fl = f.listFiles();
            out.putNextEntry(new ZipEntry(base + "/"));
            base = base.length() == 0 ? "" : base + "/";
            for (int i = 0; i < fl.length; i++) {
                zip(out, fl[i], base + fl[i].getName());
            }
        } else {
            out.putNextEntry(new ZipEntry(base));
            FileInputStream in = new FileInputStream(f);
            int b;
            while ((b = in.read()) != -1)
                out.write(b);
            in.close();
        }

    }

    /**
     * 解压缩
     * 
     * @param zipFileName
     * @param outputDirectory
     *            输出目录
     * @throws java.lang.Exception
     */
    public void unzip(String zipFileName, String outputDirectory)
            throws Exception {
        ZipInputStream in = new ZipInputStream(new FileInputStream(zipFileName));
        ZipEntry z;
        while ((z = in.getNextEntry()) != null) {
            System.out.println("正在解压 " + z.getName());
            if (z.isDirectory()) {
                String name = z.getName();
                name = name.substring(0, name.length() - 1);
                File f = new File(outputDirectory + File.separator + name);
                f.mkdir();
                System.out.println("创建目录 " + outputDirectory + File.separator
                        + name);
            } else {
                File f = new File(outputDirectory + File.separator
                        + z.getName());
                f.createNewFile();
                FileOutputStream out = new FileOutputStream(f);
                int b;
                while ((b = in.read()) != -1)
                    out.write(b);
                out.flush();
                out.close();
            }
        }

        in.close();
    }

    public static void main(String[] args) {
        try {
            ZipUtil t = new ZipUtil();
//             t.zip("D:\\py\\新建文件夹\\新建a.zip", "D:\\py\\新建文件夹\\新建a.docx");
//             t.unzip("D:\\py\\新建文件夹\\新建a.zip", "D:\\py\\新建文件夹\\新建a.docx");
             t.unzip("D:\\py\\新建文件夹\\111\\011.zip", "D:\\py\\新建文件夹\\111\\011.docx");
            
//            bytesToFile(fileToBytes("D:\\py\\新建文件夹\\新建a.zip"),"D:\\py\\新建文件夹\\111\\011.zip");
        } catch (Exception e) {
            e.printStackTrace(System.out);
        }
    }
    
    public byte[] fileToBytes(String path){
        
        File file = new File(path);
        InputStream in = null;
        try {
            in = new FileInputStream(file);
            byte[] b = new byte[(int)file.length()];
            int len = 0;
                while ((len = in.read(b))!=-1) {
                    in.read(b);
                }
            return b;
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            try {
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return new byte[]{};
    }
    
    public void bytesToFile(byte[] stu,String file){
        OutputStream out = null;
        try {
            out = new FileOutputStream(new File(file));
            out.write(stu);
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            try {
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        
    }
}