Java中字符串工具类继承org.apache.commons.lang3.StringUtils类代码

场景

转换为字节数组；是否包含字符串；替换掉HTML标签方法；替换为手机识别的HTML，去掉样式及属性，保留回车；

缩略字符串（不区分中英文字符）；转换为Double类型；转换为Float类型；转换为Long类型；转换为Integer类型；

获得i18n字符串；获得用户远程地址；驼峰命名法工具；转换为JS获取对象值，生成三目运算返回结果；

通过正则表达式获取内容；

实现

import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;

import com.google.common.collect.Lists;

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;

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

 /**
  * 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", "    ");
 }

 /**
  * 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 
  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();
 }

 /**
  * 如果不为空，则设置值
  *
  * @param target
  * @param source
  */
 public static void setValueIfNotBlank(String target, String source) {
  if (isNotBlank(source)) {
   target = source;
  }
 }

 /**
  * 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();
 }

 /**
  * 通过正则表达式获取内容
  *
  * @param regex 正则表达式
  * @param from  原字符串
  * @return
  */
 public static String[] regex(String regex, String from) {
  Pattern pattern = Pattern.compile(regex);
  Matcher matcher = pattern.matcher(from);
  List<String> results = new ArrayList<String>();
  while (matcher.find()) {
   for (int i = 0; i < matcher.groupCount(); i++) {
    results.add(matcher.group(i + 1));
   }
  }
  return results.toArray(new String[]{});
 }

}