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java 常用工具类,作为 apache-commons的补充
There is a newer version: 5.3.2302
package com.centit.support.network;

import com.centit.support.algorithm.StringBaseOpt;
import com.centit.support.security.Md5Encoder;
import org.apache.commons.lang3.StringEscapeUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

@SuppressWarnings("unused")
public abstract class UrlOptUtils {
    protected static final Logger logger = LoggerFactory.getLogger(UrlOptUtils.class);

    private UrlOptUtils() {
        throw new IllegalAccessError("Utility class");
    }
    /*private static final String ALLOWED_CHARS =
            "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.!~*'()";*/

    public static final String getUrlParamter(String szUrl) {
        String sQuery;
        try {
            java.net.URL url = new java.net.URL(szUrl);
            sQuery = url.getQuery();
        } catch (MalformedURLException e) {
            int n = szUrl.indexOf('?');
            int nM = szUrl.lastIndexOf('#');
            if (nM > 0 && nM > n) {
                if (n > 0)
                    sQuery = szUrl.substring(n + 1, nM);
                else
                    sQuery = szUrl.substring(0, nM);
            } else if (n > 0)
                sQuery = szUrl.substring(n + 1);
            else
                sQuery = "";
        }
        return sQuery;
    }

    public static final Map splitUrlParamter(
        String szUrlParameter) {
        Map params = new HashMap<>();
        int bpos = 0;
        while (true) {
            int n = szUrlParameter.indexOf('=', bpos);
            if (n < 0)
                break;
            String name = szUrlParameter.substring(bpos, n);
            int n2 = szUrlParameter.indexOf('&', n + 1);
            if (n2 < 0) {
                String value = szUrlParameter.substring(n + 1);
                try {
                    value = java.net.URLDecoder.decode(value, "utf-8");
                } catch (UnsupportedEncodingException e) {
                    logger.error(e.getMessage(), e);//e.printStackTrace();
                }
                params.put(name, value);
                break;
            } else {
                String value = szUrlParameter.substring(n + 1, n2);
                try {
                    value = java.net.URLDecoder.decode(value, "utf-8");
                } catch (UnsupportedEncodingException e) {
                    logger.error(e.getMessage(), e);//e.printStackTrace();
                }
                params.put(name, value);
                bpos = n2 + 1;
            }
        }
        return params;
    }


    /**
     * 根据URL 获取域名
     *
     * @param curl url
     * @return 返回域名
     */
    public static String getUrlDomain(String curl) {
        try {
            return new URL(curl).getHost();
        } catch (Exception e) {
            logger.error(e.getMessage(), e);//e.printStackTrace();
            return null;
        }
    }

    public static String appendParamsToUrl(String uri, Map queryParam) {
        if (queryParam == null) {
            return uri;
        }
        StringBuilder urlBuilder = new StringBuilder(uri);
        if (!uri.endsWith("?") && !uri.endsWith("&")) {
            if (uri.indexOf('?') == -1)
                urlBuilder.append('?');
            else
                urlBuilder.append('&');
        }
        int n = 0;
        for (Map.Entry ent : queryParam.entrySet()) {
            if (n > 0)
                urlBuilder.append('&');
            n++;
            urlBuilder.append(ent.getKey()).append('=').append(
                StringEscapeUtils.escapeHtml4(
                    StringBaseOpt.objectToString(ent.getValue()))
            );
        }
        return urlBuilder.toString();
    }

    public static String makeParamsToUrl(Map queryParam) {
        return appendParamsToUrl("", queryParam);
    }

    public static String appendParamToUrl(String uri, String queryUrl) {
        if (queryUrl == null || "".equals(queryUrl))
            return uri;
        return (uri.endsWith("?") || uri.endsWith("&")) ? uri + queryUrl :
            (uri.indexOf('?') == -1 ? uri + '?' + queryUrl : uri + '&' + queryUrl);
    }

    public static String appendParamToUrl(String uri, String paramName, Object paramValue) {
        return (uri.endsWith("?") || uri.endsWith("&")) ?
            uri + paramName + "=" + StringBaseOpt.objectToString(paramValue) :
            uri + (uri.indexOf('?') == -1 ? '?' : '&')
                + paramName + "=" + StringEscapeUtils.escapeHtml4(
                StringBaseOpt.objectToString(paramValue));
    }

    /**
     * 简化的url压缩算法，算法如下：
     * 1. 对Url进行md5编码
     * 2. 对md5码进行base64编码，长度为22
     * 3. 剔除base64码中的‘+’和‘/’， 取前面的一段，
     * 4. 如果位数不够，用base64码加上url再进行一次md5，用这个补齐，
     * 5. 循环4直到位数满足短码的长度需求
     * 说明一般短码的长度在6～10之间，一次就可以了。解决冲突的方法也简单，可以取长一点，比如目标是8位，可以取16位，如果发现0～7冲突，就取1～8 以此类推。
     *
     * @param longUrl   原始url
     * @param urlLength 输出url长度
     * @return 压缩后的rul
     */

    public static String shortenCodeUrl(String longUrl, int urlLength) {
        if (urlLength < 4) {
            urlLength = 8;// defalut length
        }
        StringBuilder sbBuilder = new StringBuilder(urlLength + 2);
        String md5Hex = "";
        int nLen = 0;
        while (nLen < urlLength) {
            md5Hex = Md5Encoder.encodeBase64(md5Hex + longUrl, true);
            int md5Len = md5Hex.length();
            int copylen = md5Len < urlLength - nLen ? md5Len : urlLength - nLen;
            sbBuilder.append(md5Hex, 0, copylen);
            nLen += copylen;
            if (nLen == urlLength) {
                break;
            }
        }
        return sbBuilder.toString();
    }
}