[学习交流] Java字符串工具类

/**
   * Copyright © 2012-2013 <a >JeeSite</a> All rights reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   */
package com.midai.util;

import java.io.UnsupportedEncodingException;
import java.util.Locale;
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;

/**
   * 字符串工具类, 继承org.apache.commons.lang3.StringUtils类
   * @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);
         }
      }

      /**
      * 替换掉HTML标签方法
      */
      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;
      }

      /**
      * 缩略字符串（不区分中英文字符）
      * @param str 目标字符串
      * @param length 截取长度
      * @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 "";
      }

      /**
      * 缩略字符串（替换html）
      * @param str 目标字符串
      * @param length 截取长度
      * @return
      */
      public static String rabbr(String str, int length) {
         return abbr(replaceHtml(str), length);
      }


      /**
      * 转换为Double类型
      */
      public static Double toDouble(Object val){
         if (val == null){
            return 0D;
         }
         try {
            return Double.valueOf(trim(val.toString()));
         } catch (Exception e) {
            return 0D;
         }
      }

      /**
      * 转换为Float类型
      */
      public static Float toFloat(Object val){
         return toDouble(val).floatValue();
      }

      /**
      * 转换为Long类型
      */
      public static Long toLong(Object val){
         return toDouble(val).longValue();
      }

      /**
      * 转换为Integer类型
      */
      public static Integer toInteger(Object val){
         return toLong(val).intValue();
      }


      /**
      * 获得用户远程地址
      */
      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();
      }

}

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[学习交流] Java字符串工具类

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