Deflater 压缩解压

女爷i 2021-12-22 02:17 383阅读 0赞

import java.util.Arrays;
    import java.util.zip.Deflater;
    import java.util.zip.Inflater;
    
    import cc.zeelan.mall.common.assertion.Assert;
    
    /**
     * 数据压缩解压
     * 
     * @project common-utils
     * @fileName StringZlibUtil.java
     * @Description
     * @author light-zhang
     * @date 2019年5月9日
     * @version 1.0.0
     */
    public class CompressUtil {
        /**
         * 压缩
         * 
         * @param input  
         * @return
         */
        public static byte[] compress(byte[] input) {
            try {
                byte[] output = new byte[Integer.sum(input.length + 10,
                        Double.valueOf(Math.ceil(input.length * 0.25f)).intValue())];
                Deflater compresser = new Deflater(9);//压缩级别
                compresser.setInput(input);
                compresser.finish();
                int compressedDataLength = compresser.deflate(output);
                compresser.end();
                return Arrays.copyOf(output, compressedDataLength);
            } catch (Exception e) {
                Assert.RuntimeException("数据压缩失败");
            }
            return null;
    
        }
    
        /**
         * 解压缩
         * 
         * @param barr 须要解压缩的字节数组
         * @return
         * @throws Exception
         */
        public static byte[] uncompress(byte[] barr) {
            try {
                byte[] result = new byte[2014];
                Inflater inf = new Inflater();
                inf.setInput(barr);
                int infLen = inf.inflate(result);
                inf.end();
                return Arrays.copyOf(result, infLen);
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }
    
        public static void main(String[] args) throws Exception {
            String str = "abcde|qqqqqqqqqqqqqqq|wwwwwwwwwwwwwwwwwwww"; 
            System.out.println("压缩前 " + str.getBytes().length);
            byte[] def = CompressUtil.compress(str.getBytes());
            System.out.println("压缩后 " + def.length);
            byte[] inf = CompressUtil.uncompress(def);
            System.out.println(new String(inf)); 
        }
    }

转载于:https://www.cnblogs.com/light-zhang/p/10895810.html