java从url中获取域名和虚拟目录

一般情况下我们获取请求相关信息，我们通过servlet相关api就能完成，有时我们需要在纯se环境中得到url字符串中想要的信息，如域名、虚拟目录。下面直接贴出代码：

package com.bs.util;import java.util.regex.Matcher;import java.util.regex.Pattern;public class UrlUtil {    /**     * 从url中匹配虚拟目录（除去协议、域名、端口号和参数部分）          * @param url     * @param containProjectName     *            是否去掉项目名     * @return     */    public static String getURI(String url, boolean containProjectName) {        String regx = "(?:https?://)(?:(?:\\w+\\.){2,3}|[a-zA-Z0-9]+)(?:\\w+)(?::[0-9]+)?" + (containProjectName ? "(?:/\\w+/)" : "")                + "([^?]*)";        Pattern p = Pattern.compile(regx);        Matcher matcher = p.matcher(url);        if (matcher.find()) {            return matcher.group(1);        }        return null;    }    /**     * 匹配域名     * 如url为http://192.168.10.36:2829/appweb/script/plugin/ueditor/jsp/upload1/20170901/41281504250668218.jpg     * 返回192.168.10.36     *      * @param url     * @return     */    public static String getHost(String url) {        Pattern p = Pattern.compile("(?:https?://)((\\w+\\.){2,3}\\w+|[a-zA-z0-9]+)(?::[0-9]+)?");        Matcher matcher = p.matcher(url);        if (matcher.find()) {            return matcher.group(1);        }        return null;    }    public static void main(String[] args) {        String path = "http://localhost:2829/script/plugin/ueditor/jsp/upload1/20170918/95421505699068820.jpg?t=3";        System.out.println(getURI(path,false));///script/plugin/ueditor/jsp/upload1/20170918/95421505699068820.jpg        System.out.println(getHost(path));//localhost        path="http://localhost:2829/app/script/plugin/ueditor/jsp/upload1/20170918/95421505699068820.jpg?t=3";        System.out.println(getURI(path,true));//script/plugin/ueditor/jsp/upload1/20170918/95421505699068820.jpg        System.out.println(getHost(path));//localhost        path="http://www.baidu.com:2829/app/script/plugin/ueditor/jsp/upload1/20170918/95421505699068820.jpg?t=3";        System.out.println(getURI(path,true));///script/plugin/ueditor/jsp/upload1/20170918/95421505699068820.jpg        System.out.println(getHost(path));//www.baidu.com        path="http://www.baidu.com:2829/app/script/plugin/ueditor/jsp/upload1/20170918/95421505699068820.jpg?t=3";        System.out.println(getURI(path,true));//script/plugin/ueditor/jsp/upload1/20170918/95421505699068820.jpg        System.out.println(getHost(path));//www.baidu.com        path="http://192.168.10.36:2829/app/script/plugin/ueditor/jsp/upload1/20170918/95421505699068820.jpg?t=3";        System.out.println(getURI(path,true));//script/plugin/ueditor/jsp/upload1/20170918/95421505699068820.jpg        System.out.println(getHost(path));//192.168.10.36    }}

我们也可以取出协议、端口号、请求参数等，应该不难，因为暂时不需要这些信息，所以就没做这个功能了。