java 实现PHP gzcompress 功能

为了直观加了base64 

PHP 代码：

1<?php
2$a = gzcompress("abc");
3echo base64_encode($a); 
4
5//输出: eJxLTEoGAAJNASc=
6
7解码：gzuncompress();

源码提示默认使用的是 zlib的  deflate 进行编码的；

function gzcompress ($data, $level = -1, $encoding = ZLIB_ENCODING_DEFLATE) {}

对应的 JAVA处理代码 （JDK1.8）：

1import java.io.ByteArrayOutputStream;
2import java.io.IOException;
3import java.util.Arrays;
4import java.util.Base64;
5import java.util.zip.Deflater;
6import java.util.zip.Inflater;
7
8public class GzCompress{
9    public static void main(String[] args) {
10
11        String encodeCompressd  = "eJxLTEoGAAJNASc=";
12        byte[] compressd = Base64.getDecoder().decode( encodeCompressd );
13        String origin  = new String( decompress(compressd) );
14        System.out.println("origin: "+origin);
15        byte[] _compressd = compress(origin.getBytes());
16        byte[] _encodeCompress = Base64.getEncoder().encode(_compressd);
17        System.out.println(new String(_encodeCompress));
18    }
19
20    public static byte[] decompress(byte[] data)  {
21
22        byte[] output = new byte[0];
23
24        Inflater decompresser = new Inflater();
25        decompresser.reset();
26        decompresser.setInput(data);
27
28        ByteArrayOutputStream o = new ByteArrayOutputStream(data.length);
29        try {
30            byte[] buf = new byte[1024];
31            while (!decompresser.finished()) {
32                int i = decompresser.inflate(buf);
33                o.write(buf, 0, i);
34            }
35            output = o.toByteArray();
36        } catch (Exception e) {
37            e.printStackTrace();
38        } finally {
39            try {
40                o.close();
41            } catch (IOException e) {
42                e.printStackTrace();
43            }
44        }
45        decompresser.end();
46        return output;
47    }
48
49    public static byte[] compress( byte[] bytes ){
50
51        byte[] output = new byte[1024];
52        Deflater compresser = new Deflater();
53        compresser.setInput(bytes);
54        compresser.finish();
55        int compressedDataLength = compresser.deflate(output);
56        return Arrays.copyOf(output,compressedDataLength);
57    }
58}

对应输出：

origin: abc
compressLength:11
eJxLTEoGAAJNASc=