图片压缩工具类

ゝ一纸荒年。 2022-06-06 08:05 258阅读 0赞

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);   
            }   
        }   
    }