解压HTTP API的GZIP压缩数据

1.对Java后端的请求HttpURLConnection对象中的消息头设置压缩

connection.setRequestProperty("Accept-Encoding", "gzip, deflate");

2.发送请求后获取response中的content-encoding

connection.getContentEncoding();   // 获取content-encoding

3.如果content-encoding == gzip，则将获取到的字节流转为字节数组（压缩），然后再将字节数组解压

public static byte[] uncompresss(byte[] bytes) throws Exception {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ByteArrayInputStream in = new ByteArrayInputStream(bytes);
        GZIPInputStream gzip = new GZIPInputStream(in);
        byte[] buffer = new byte[1024];

        int n;
        while((n = gzip.read(buffer)) >= 0) {
            out.write(buffer, 0, n);
        }

        return out.toByteArray();
    }

gzip压缩字符串为字节数组

/**
     * 将字符串进行gzip压缩，输出压缩后的字节数组
     */
    public static byte[] compress(String str, String encoding) throws Exception {
        if (str == null || str.length() == 0) {
            return null;
        }
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        GZIPOutputStream gzip;
       
        gzip = new GZIPOutputStream(out);
        gzip.write(str.getBytes(encoding));
        gzip.close();
       
        return out.toByteArray();
    }