对url的页面路径和参数的解析

import javax.servlet.http.HttpServletRequest;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

public class UrlUtil {
    /**
     * 解析出url请求的路径
     * @param strURL url地址
     * @return url路径
     */
    public static String getUrlPage(String strURL) {
        String strPage = null;  //请求的页面
        String[] arrSplit = null;
        strURL = strURL.trim();
        if (strURL.length() > 0) {
            arrSplit = strURL.split("[?]");
            if (arrSplit.length > 1) {
                if (arrSplit[0] != null) {
                    strPage = arrSplit[0];
                }
            }
        }
        return strPage;
    }

    /**
     * 解析出url参数中的键值对,放入map中
     * 注：URL参数中不能有"&",但可以有"="!!!("="已经做了处理)
     * @param url url地址
     * @return url请求参数部分
     */
    public static Map getUrlParamsMap(String url) {
        Map requestParams = new HashMap<>();
        String[] arrSplit = null;

        String strUrlParams = getUrlParams(url);
        if (strUrlParams == null) {
            return requestParams;
        }
        arrSplit = strUrlParams.split("&");
        for (String strSplit:arrSplit) {
            String[] arrSplitEqual = null;
            arrSplitEqual = strSplit.split("[=]");
            if (arrSplitEqual.length > 1) {
                //因为参数中包含url,url中也会有"="号,所以根据"="拆分会得到长度大于2的字符串数组
                if (arrSplitEqual.length > 2) {
                    for (int i = 2;i < arrSplitEqual.length;i++) {
                        arrSplitEqual[1] += ("=" + arrSplitEqual[i]);
                    }
                }
                requestParams.put(arrSplitEqual[0], arrSplitEqual[1]);
            } else if (!arrSplitEqual[0].equals("")) {
                //只有参数,没有参数值,赋默认值""
                requestParams.put(arrSplitEqual[0], "");
                }
            }
        return requestParams;
    }

    /**
     * 去掉url中的路径，留下请求参数部分
     * URL类详解:http://www.runoob.com/java/java-url-processing.html
     * @param strURL url地址
     * @return url请求参数部分
     */
    private static String getUrlParams(String strURL) {
        URL url = null;
        try {
            url = new URL(strURL);
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
        String strAllParam = url.getQuery(); //请求的参数
        return strAllParam;
    }

    /**
     *返回url全路径
     */
    public static String getCompleteUrl() {
        HttpServletRequest request = RequestUtils.getRequest();
        String completeUrl  = request.getScheme()+"://" + request.getServerName() //服务器地址
                + ":"
                + request.getServerPort()           //端口号
                + request.getContextPath()      //项目名称
                + request.getServletPath()      //请求页面或其他地址
                + "?" + (request.getQueryString()); //参数
        return completeUrl;
    }

    public static String getContextPath() {
        HttpServletRequest request = RequestUtils.getRequest();
        String contextPath  = request.getScheme()+"://" + request.getServerName() //服务器地址(域名)
                + ":"
                + request.getServerPort()           //端口号
                + request.getContextPath();     //项目名称
        return contextPath;
    }

    /**
     *获取客户端的ip
     */
    public static String getIpAddress(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        if (ip.contains(",")) {
            return ip.split(",")[0];
        } else {
            return ip;
        }
    }
}