图片压缩工具类

package tools.util;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.CRC32;
import java.util.zip.CheckedOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

import org.apache.log4j.Logger;

/****
 * 图片压缩工具类
 * @author youqiang.xiong
 * @since 2016-10-9 
 */
public class ZipCompressor {   
    private static final Logger log = Logger.getLogger(ZipCompressor.class);
    private static final int BUFFER = 8192;   

    public static void compress(String srcPathName, File zipFile) {   
        File file = new File(srcPathName);   
        if (!file.exists())   
            throw new RuntimeException(srcPathName + "不存在！");   
        try {   
            FileOutputStream fileOutputStream = new FileOutputStream(zipFile);   
            CheckedOutputStream cos = new CheckedOutputStream(fileOutputStream,   
                    new CRC32());   
            ZipOutputStream out = new ZipOutputStream(cos);   
            String basedir = "";   
            compress(file, out, basedir);   
            out.close();   
        } catch (Exception e) {   
            throw new RuntimeException(e);   
        }   
    }   

    private static void compress(File file, ZipOutputStream out, String basedir) {   
        /* 判断是目录还是文件 */  
        if (file.isDirectory()) {   
            log.info("压缩：" + basedir + file.getName());   
            compressDirectory(file, out, basedir);   
        } else {   
            log.info("压缩：" + basedir + file.getName());   
            compressFile(file, out, basedir);   
        }   
    }   

    /** 压缩一个目录 */  
    private static void compressDirectory(File dir, ZipOutputStream out, String basedir) {   
        if (!dir.exists())   
            return;   

        File[] files = dir.listFiles();   
        for (int i = 0; i < files.length; i++) {   
            /* 递归 */  
            compress(files[i], out, basedir + dir.getName() + "/");   
        }   
    }   

    /** 压缩一个文件 */  
    private static void compressFile(File file, ZipOutputStream out, String basedir) {   
        if (!file.exists()) {   
            return;   
        }   
        try {   
            BufferedInputStream bis = new BufferedInputStream(   
                    new FileInputStream(file));   
            ZipEntry entry = new ZipEntry(basedir + file.getName());   
            out.putNextEntry(entry);   
            int count;   
            byte data[] = new byte[BUFFER];   
            while ((count = bis.read(data, 0, BUFFER)) != -1) {   
                out.write(data, 0, count);
            }   
            bis.close();   
        } catch (Exception e) {   
            throw new RuntimeException(e);   
        }   
    }   
}