Java tutorial
/** * Copyright © 2012-2013 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); */ package cn.org.citycloud.srdz.utils; import java.io.UnsupportedEncodingException; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Locale; import java.util.UUID; import java.util.regex.Matcher; import java.util.regex.Pattern; import javax.servlet.http.HttpServletRequest; import org.apache.commons.lang3.StringEscapeUtils; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes; import org.springframework.web.servlet.LocaleResolver; /** * , org.apache.commons.lang3.StringUtils * @author ThinkGem * @version 2013-05-22 */ public class StringUtils extends org.apache.commons.lang3.StringUtils { public static String lowerFirst(String str) { if (StringUtils.isBlank(str)) { return ""; } else { return str.substring(0, 1).toLowerCase() + str.substring(1); } } public static String upperFirst(String str) { if (StringUtils.isBlank(str)) { return ""; } else { return str.substring(0, 1).toUpperCase() + str.substring(1); } } /** * ?HTML */ public static String replaceHtml(String html) { if (isBlank(html)) { return ""; } String regEx = "<.+?>"; Pattern p = Pattern.compile(regEx); Matcher m = p.matcher(html); String s = m.replaceAll(""); return s; } /** * ? * @param str * @param length ? * @return */ public static String abbr(String str, int length) { if (str == null) { return ""; } try { StringBuilder sb = new StringBuilder(); int currentLength = 0; for (char c : replaceHtml(StringEscapeUtils.unescapeHtml4(str)).toCharArray()) { currentLength += String.valueOf(c).getBytes("GBK").length; if (currentLength <= length - 3) { sb.append(c); } else { sb.append("..."); break; } } return sb.toString(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return ""; } /** * ?html * @param str * @param length ? * @return */ public static String rabbr(String str, int length) { return abbr(replaceHtml(str), length); } /** * ?Double */ public static Double toDouble(Object val) { if (val == null) { return 0D; } try { return Double.valueOf(trim(val.toString())); } catch (Exception e) { return 0D; } } /** * ?Float */ public static Float toFloat(Object val) { return toDouble(val).floatValue(); } /** * ?Long */ public static Long toLong(Object val) { return toDouble(val).longValue(); } /** * ?Integer */ public static Integer toInteger(Object val) { return toLong(val).intValue(); } /** * i18n */ public static String getMessage(String code, Object[] args) { LocaleResolver localLocaleResolver = SpringContextHolder.getBean(LocaleResolver.class); HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()) .getRequest(); Locale localLocale = localLocaleResolver.resolveLocale(request); return SpringContextHolder.getApplicationContext().getMessage(code, args, localLocale); } /** * ? */ public static String getRemoteAddr(HttpServletRequest request) { String remoteAddr = request.getHeader("X-Real-IP"); if (isNotBlank(remoteAddr)) { remoteAddr = request.getHeader("X-Forwarded-For"); } else if (isNotBlank(remoteAddr)) { remoteAddr = request.getHeader("Proxy-Client-IP"); } else if (isNotBlank(remoteAddr)) { remoteAddr = request.getHeader("WL-Proxy-Client-IP"); } return remoteAddr != null ? remoteAddr : request.getRemoteAddr(); } public static Date String2Date(String str, String pattern) { SimpleDateFormat sdfDateFormat = new SimpleDateFormat(pattern); try { return sdfDateFormat.parse(str); } catch (ParseException e) { // TODO Auto-generated catch block return new Date(); } } /** * ?? * * @param source * @param urls * @return */ public static boolean contains(String source, String[] urls) { for (String url : urls) { if (source.contains(url)) { return true; } } return false; } public static void main(String[] args) { System.out.println(UUID.randomUUID()); } }