字符串工具类

public class StringUtils extends org.apache.commons.lang3.StringUtils {
   
    private static final char SEPARATOR = '_';
    private static final String CHARSET_NAME = "UTF-8";
    
    /**
     * 转换为字节数组
     * @param str
     * @return
     */
    public static byte[] getBytes(String str){
       if (str != null){
          try {
            return str.getBytes(CHARSET_NAME);
         } catch (UnsupportedEncodingException e) {
            return null;
         }
       }else{
          return null;
       }
    }
    
    /**
    * 转换为Boolean类型
    * 'true', 'on', 'y', 't', 'yes' or '1' (case insensitive) will return true. Otherwise, false is returned.
    */
   public static Boolean toBoolean(final Object val){
      if (val == null){
         return false;
      }
      return BooleanUtils.toBoolean(val.toString()) || "1".equals(val.toString());
   }
   
    /**
     * 转换为字节数组
     * @param str
     * @return
     */
    public static String toString(byte[] bytes){
       try {
         return new String(bytes, CHARSET_NAME);
      } catch (UnsupportedEncodingException e) {
         return EMPTY;
      }
    }
   public static String toString(Object obj) {
      StringBuffer buffer = new StringBuffer();
      if (obj != null) {
         buffer.append(obj);
      }
      return buffer.toString();
   }
    
    /**
    * 如果对象为空，则使用defaultVal值 
    *     see: ObjectUtils.toString(obj, defaultVal)
    * @param obj
    * @param defaultVal
    * @return
    */
    public static String toString(final Object obj, final String defaultVal) {
        return obj == null ? defaultVal : obj.toString();
    }
    
    /**
     * 是否包含字符串
     * @param str 验证字符串
     * @param strs 字符串组
     * @return 包含返回true
     */
    public static boolean inString(String str, String... strs){
       if (str != null){
           for (String s : strs){
              if (str.equals(trim(s))){
                 return true;
              }
           }
       }
       return false;
    }
    
   /**
    * 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;
   }
   
   /**
    * 替换为手机识别的HTML，去掉样式及属性，保留回车。
    * @param html
    * @return
    */
   public static String replaceMobileHtml(String html){
      if (html == null){
         return "";
      }
      return html.replaceAll("<([a-z]+?)\\s+?.*?>", "<$1>");
   }
   
   /**
    * 替换为手机识别的HTML，去掉样式及属性，保留回车。
    * @param txt
    * @return
    */
   public static String toHtml(String txt){
      if (txt == null){
         return "";
      }
      return replace(replace(Encodes.escapeHtml(txt), "\n", "<br/>"), "\t", "&nbsp; &nbsp; ");
   }

   /**
    * 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 "";
   }
   
   public static String abbr2(String param, int length) {
      if (param == null) {
         return "";
      }
      StringBuffer result = new StringBuffer();
      int n = 0;
      char temp;
      boolean isCode = false; // 是不是HTML代码
      boolean isHTML = false; // 是不是HTML特殊字符,如&nbsp;
      for (int i = 0; i < param.length(); i++) {
         temp = param.charAt(i);
         if (temp == '<') {
            isCode = true;
         } else if (temp == '&') {
            isHTML = true;
         } else if (temp == '>' && isCode) {
            n = n - 1;
            isCode = false;
         } else if (temp == ';' && isHTML) {
            isHTML = false;
         }
         try {
            if (!isCode && !isHTML) {
               n += String.valueOf(temp).getBytes("GBK").length;
            }
         } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
         }

         if (n <= length - 3) {
            result.append(temp);
         } else {
            result.append("...");
            break;
         }
      }
      // 取出截取字符串中的HTML标记
      String temp_result = result.toString().replaceAll("(>)[^<>]*(<?)",
            "$1$2");
      // 去掉不需要结素标记的HTML标记
      temp_result = temp_result
            .replaceAll(
                  "</?(AREA|BASE|BASEFONT|BODY|BR|COL|COLGROUP|DD|DT|FRAME|HEAD|HR|HTML|IMG|INPUT|ISINDEX|LI|LINK|META|OPTION|P|PARAM|TBODY|TD|TFOOT|TH|THEAD|TR|area|base|basefont|body|br|col|colgroup|dd|dt|frame|head|hr|html|img|input|isindex|li|link|meta|option|p|param|tbody|td|tfoot|th|thead|tr)[^<>]*/?>",
                  "");
      // 去掉成对的HTML标记
      temp_result = temp_result.replaceAll("<([a-zA-Z]+)[^<>]*>(.*?)</\\1>",
            "$2");
      // 用正则表达式取出标记
      Pattern p = Pattern.compile("<([a-zA-Z]+)[^<>]*>");
      Matcher m = p.matcher(temp_result);
      List<String> endHTML = Lists.newArrayList();
      while (m.find()) {
         endHTML.add(m.group(1));
      }
      // 补全不成对的HTML标记
      for (int i = endHTML.size() - 1; i >= 0; i--) {
         result.append("</");
         result.append(endHTML.get(i));
         result.append(">");
      }
      return result.toString();
   }
   
   /**
    * 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i18n字符串
    */
   public static String getMessage(String code, Object[] args) {
      LocaleResolver localLocaleResolver = (LocaleResolver) SpringContextHolder.getBean(LocaleResolver.class);
      HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();  
      Locale localLocale = localLocaleResolver.resolveLocale(request);
      return SpringContextHolder.getApplicationContext().getMessage(code, args, localLocale);
   }
   
   /**
    * 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();   }   


/**
    * 驼峰命名法工具
* @return
    *        toCamelCase("hello_world") == "helloWorld" 
    *        toCapitalizeCamelCase("hello_world") == "HelloWorld"
    *        toUnderScoreCase("helloWorld") = "hello_world"
    */
public static String toCamelCase(String s) {        
if (s == null) {            
return null;        }        s = s.toLowerCase();        




StringBuilder sb = new StringBuilder(s.length());        
boolean upperCase = false;        
for (int i = 0; i < s.length(); i++) {            
char c = s.charAt(i);            

if (c == SEPARATOR) {                upperCase = 
true;            } 
else if (upperCase) {                
sb.append(Character.toUpperCase(c));                upperCase = 
false;            } 
else {                
sb.append(c);            }        }        



return sb.toString();    }    


/**
    * 驼峰命名法工具
* @return
    *        toCamelCase("hello_world") == "helloWorld" 
    *        toCapitalizeCamelCase("hello_world") == "HelloWorld"
    *        toUnderScoreCase("helloWorld") = "hello_world"
    */
public static String toCapitalizeCamelCase(String s) {        
if (s == null) {            
return null;        }        s = 

toCamelCase(s);        
return s.substring(0, 1).toUpperCase() + s.substring(1);    }        


/**
    * 驼峰命名法工具
* @return
    *        toCamelCase("hello_world") == "helloWorld" 
    *        toCapitalizeCamelCase("hello_world") == "HelloWorld"
    *        toUnderScoreCase("helloWorld") = "hello_world"
    */
public static String toUnderScoreCase(String s) {        
if (s == null) {            
return null;        }        


StringBuilder sb = new StringBuilder();        
boolean upperCase = false;        
for (int i = 0; i < s.length(); i++) {            
char c = s.charAt(i);            

boolean nextUpperCase = true;            

if (i < (s.length() - 1)) {                nextUpperCase = 
Character.isUpperCase(s.charAt(i + 1));            }            


if ((i > 0) && Character.isUpperCase(c)) {                
if (!upperCase || !nextUpperCase) {                    
sb.append(SEPARATOR);                }                upperCase = 

true;            } 
else {                upperCase = 
false;            }            


sb.append(Character.toLowerCase(c));        }        


return sb.toString();    }     


/**
     * 转换为JS获取对象值，生成三目运算返回结果
* @param objectString 对象串
*   例如：row.user.id
     *   返回：!row?'':!row.user?'':!row.user.id?'':row.user.id
     */
public static String jsGetVal(String objectString){       
StringBuilder result = new StringBuilder();       
StringBuilder val = new StringBuilder();       
String[] vals = split(objectString, ".");       
for (int i=0; i<vals.length; i++){          
val.append("." + vals[i]);          
result.append("!"+(val.substring(1))+"?'':");       }       

result.append(val.substring(1));       
return result.toString();    }    }