public static void main(String[] args) {
    try {
        String longString = "www.baidu.com";
        // GZIP压缩后的数据
        byte[] compress = compress(longString.getBytes());
        //通过Base64转成字符串
        String longStringEncoded = Base64.getEncoder().encodeToString(compress);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public static byte[] compress(byte[] data) throws IOException {
    if (data == null || data.length == 0) {
        return null;
    }
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    GZIPOutputStream gzip = new GZIPOutputStream(out);
    gzip.write(data);
    gzip.close();
    return out.toByteArray();
}

public static byte[] uncompress(byte[] data) throws IOException {
    if (data == null || data.length == 0) {
        return null;
    }
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    ByteArrayInputStream inputStream = new ByteArrayInputStream(data);
    GZIPInputStream gzip = new GZIPInputStream(inputStream);
    byte[] buffer = new byte[256];
    int n;
    while ((n = gzip.read(buffer)) >= 0) {
        out.write(buffer, 0, n);
    }
    gzip.close();
    inputStream.close();
    return out.toByteArray();
}

//后端压缩后的字符串

let encodeDpUrl = 'H4sIAAAAAAAAACsvL9dLSsxMKdVLzs8FAA3FGxcNAAAA';

//Base64解码

let gzipUrl = atob(encodeDpUrl);

// 将二进制字符串转换为字符数字数组

let charData = gzipUrl.split('').map(function (x) { return x.charCodeAt(0); });

//将数字数组转换为字节数组

let binData = new Uint8Array(charData);

//unzip   需要引入 pako.js文件   https://github.com/nodeca/pako

var data = pako.inflate(binData);

// 将字节数组转字符串

let longString = String.fromCharCode.apply(null, new Uint16Array(data));

console.info(longString);

记：url编码解码问题

//后端进行url编码，

String encodeUrl = URLEncoder.encode(要编码的URL, Constant.ENCODING_UTF_8);

// 前端进行url解码

let decodeURI = decodeURIComponent(要解码的URL);