Java之StringUtil工具类
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import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.PrintStream;import java.math.BigDecimal;import java.util.regex.Matcher;import java.util.regex.Pattern;public class StringUtil { /** * 过滤空NULL * @param o * @return */ public static String FilterNull(Object o) { return o != null && !"null".equals(o.toString()) ? o.toString().trim() : "" ; } /** * 是否为空 * @param o * @return */ public static boolean isEmpty(Object o) { if (o == null) { return true; } if ("".equals(FilterNull(o.toString()))) { return true; } else { return false; } } /** * 是否不为空 * @param o * @return */ public static boolean isNotEmpty(Object o) { if (o == null) { return false; } if ("".equals(FilterNull(o.toString()))) { return false; } else { return true; } } /** * 是否可转化为数字 * @param o * @return */ public static boolean isNum(Object o) { try { new BigDecimal(o.toString()); return true; } catch (Exception e) { } return false; } /** * 是否可转化为Long型数字 * @param o * @return */ public static boolean isLong(Object o) { try { new Long(o.toString()); return true; } catch (Exception e) { } return false; } /** * 转化为Long型数字, 不可转化时返回0 * @param o * @return */ public static Long toLong(Object o) { if (isLong(o)) { return new Long(o.toString()); } else { return 0L; } } /** * 转化为int型数字, 不可转化时返回0 * @param o * @return */ public static int toInt(Object o) { if (isNum(o)) { return new Integer(o.toString()); } else { return 0; } } /** * 按字符从左截取固定长度字符串, 防止字符串超长, 默认截取50 * @param o * @return */ public static String holdmaxlength(Object o) { int maxlength = 50; if (o == null) { return ""; } return subStringByByte(o, maxlength); } /** * 从左截取固定长度字符串, 防止字符串超长, maxlength为0时默认50 * @param o * @return */ public static String holdmaxlength(Object o, int maxlength) { maxlength = maxlength <= 0 ? 50 : maxlength; if (o == null) { return ""; } return subStringByByte(o, maxlength); } /** * 按字节截取字符串 * @param str * @param len * @return */ private static String subStringByByte(Object o, int len) { if (o == null) { return ""; } String str = o.toString(); String result = null; if (str != null) { byte[] a = str.getBytes(); if (a.length <= len) { result = str; } else if (len > 0) { result = new String(a, 0, len); int length = result.length(); if (str.charAt(length - 1) != result.charAt(length - 1)) { if (length < 2) { result = null; } else { result = result.substring(0, length - 1); } } } } return result; } /** * 逗号表达式_添加 * @param commaexpress 原逗号表达式 如 A,B * @param newelement 新增元素 C * @return A,B,C */ public static String comma_add(String commaexpress, String newelement) { return comma_rect(FilterNull(commaexpress) + "," + FilterNull(newelement)); } /** * 逗号表达式_删除 * @param commaexpress 原逗号表达式 如 A,B,C * @param delelement 删除元素 C,A * @return B */ public static String comma_del(String commaexpress, String delelement) { if ((commaexpress == null) || (delelement == null) || (commaexpress.trim().equals(delelement.trim()))) { return ""; } String[] deletelist = delelement.split(","); String result = commaexpress; for (String delstr : deletelist) { result = comma_delone(result, delstr); } return result; } /** * 逗号表达式_单一删除 * @param commaexpress 原逗号表达式 如 A,B,C * @param delelement 删除元素 C * @return A,B */ public static String comma_delone(String commaexpress, String delelement) { if ((commaexpress == null) || (delelement == null) || (commaexpress.trim().equals(delelement.trim()))) { return ""; } String[] strlist = commaexpress.split(","); StringBuffer result = new StringBuffer(); for (String str : strlist) { if ((!str.trim().equals(delelement.trim())) && (!"".equals(str.trim()))) { result.append(str.trim() + ","); } } return result.toString().substring(0, result.length() - 1 > 0 ? result.length() - 1 : 0); } /** * 逗号表达式_判断是否包含元素 * @param commaexpress 逗号表达式 A,B,C * @param element C * @return true */ public static boolean comma_contains(String commaexpress, String element) { boolean flag = false; commaexpress = FilterNull(commaexpress); element = FilterNull(element); if (!"".equals(commaexpress) && !"".equals(element)) { String[] strlist = commaexpress.split(","); for (String str : strlist) { if (str.trim().equals(element.trim())) { flag = true; break; } } } return flag; } /** * 逗号表达式_取交集 * @param commaexpressA 逗号表达式1 A,B,C * @param commaexpressB 逗号表达式2 B,C,D * @return B,C */ public static String comma_intersect(String commaexpressA, String commaexpressB) { commaexpressA = FilterNull(commaexpressA); commaexpressB = FilterNull(commaexpressB); StringBuffer result = new StringBuffer(); String[] strlistA = commaexpressA.split(","); String[] strlistB = commaexpressB.split(","); for (String boA : strlistA) { for (String boB : strlistB) { if (boA.trim().equals(boB.trim())) { result.append(boA.trim() + ","); } } } return comma_rect(result.toString()); } /** * 逗号表达式_规范 * @param commaexpress 逗号表达式 ,A,B,B,,C * @return A,B,C */ public static String comma_rect(String commaexpress) { commaexpress = FilterNull(commaexpress); String[] strlist = commaexpress.split(","); StringBuffer result = new StringBuffer(); for (String str : strlist) { if (!("".equals(str.trim())) && !("," + result.toString() + ",").contains("," + str + ",") && !"null".equals(str)) { result.append(str.trim() + ","); } } return result.toString().substring(0, (result.length() - 1 > 0) ? result.length() - 1 : 0); } /** * 逗号表达式_反转 * @param commaexpress A,B,C * @return C,B,A */ public static String comma_reverse(String commaexpress) { commaexpress = FilterNull(commaexpress); String[] ids = commaexpress.split(","); StringBuffer str = new StringBuffer(); for (int i = ids.length - 1; i >= 0; i--) { str.append(ids[i] + ","); } return comma_rect(str.toString()); } /** * 逗号表达式_获取首对象 * @param commaexpress A,B,C * @return A */ public static String comma_first(String commaexpress) { commaexpress = FilterNull(commaexpress); String[] ids = commaexpress.split(","); System.out.println("length:" + ids.length); if ((ids != null) && (ids.length > 0)) { return ids[0]; } return null; } /** * 逗号表达式_获取尾对象 * @param commaexpress A,B,C * @return C */ public static String comma_last(String commaexpress) { commaexpress = FilterNull(commaexpress); String[] ids = commaexpress.split(","); if ((ids != null) && (ids.length > 0)) { return ids[(ids.length - 1)]; } return null; } /** * 替换字符串,支持字符串为空的情形 * @param strData * @param regex * @param replacement * @return */ public static String replace(String strData, String regex, String replacement) { return strData == null ? "" : strData.replaceAll(regex, replacement); } /** * 字符串转为HTML显示字符 * @param strData * @return */ public static String String2HTML(String strData){ if( strData == null || "".equals(strData) ){ return "" ; } strData = replace(strData, "&", "&"); strData = replace(strData, "<", "<"); strData = replace(strData, ">", ">"); strData = replace(strData, "\"", """); return strData; } /** * 把异常信息转换成字符串，以方便保存 */ public static String getexceptionInfo(Exception e){ ByteArrayOutputStream baos = new ByteArrayOutputStream(); try{ e.printStackTrace(new PrintStream(baos)); }finally{ try { baos.close(); } catch (IOException e1) { e1.printStackTrace(); } } return baos.toString(); } /** 过滤特殊符号 */ public static String regex(String str){ Pattern pattern = Pattern.compile("[0-9-:/ ]");// 中文汉字编码区间 Matcher matcher; char[] array = str.toCharArray(); for (int i = 0; i < array.length; i++) { matcher = pattern.matcher(String.valueOf(array[i])); if (!matcher.matches()) {// 空格暂不替换 str = str.replace(String.valueOf(array[i]), "");// 特殊字符用空字符串替换 } } return str; } public static String comma_insert(String commaexpress, String newelement,int index){ int length = commaexpress.length(); if ( index > length ) { index = length; }else if ( index < 0){ index = 0; } String result = commaexpress.substring(0, index) + newelement + commaexpress.substring(index, commaexpress.length()); return result; } /** * 将"/"替换成"\" * @param strDir * @return */ public static String changeDirection(String strDir) { String s = "/"; String a = "\\"; if (strDir != null && !" ".equals(strDir)) { if (strDir.contains(s)) { strDir = strDir.replace(s, a); } } return strDir; } /** * 去除字符串中 头和尾的空格，中间的空格保留 * * @Title: trim * @Description: TODO * @return String * @throws */ public static String trim(String s) { int i = s.length();// 字符串最后一个字符的位置 int j = 0;// 字符串第一个字符 int k = 0;// 中间变量 char[] arrayOfChar = s.toCharArray();// 将字符串转换成字符数组 while ((j < i) && (arrayOfChar[(k + j)] <= ' ')) ++j;// 确定字符串前面的空格数 while ((j < i) && (arrayOfChar[(k + i - 1)] <= ' ')) --i;// 确定字符串后面的空格数 return (((j > 0) || (i < s.length())) ? s.substring(j, i) : s);// 返回去除空格后的字符串 } /** * 得到大括号中的内容 * @param str * @return */ public static String getBrackets(String str) { int a = str.indexOf("{"); int c = str.indexOf("}"); if (a >= 0 && c >= 0 & c > a) { return (str.substring(a + 1, c)); } else { return str; } } /** * 将字符串中所有的，替换成| * * @param str * @return */ public static String commaToVerti(String str) { if (str != null && !"".equals(str) && str.contains(",")) { return str.replaceAll(",", "|"); } else { return str; } } /** * 去掉字符串中、前、后的空格 * @param args * @throws IOException */ public static String extractBlank(String name) { if (name != null && !"".equals(name)) { return name.replaceAll(" +", ""); } else { return name; } } /** * 将null换成"" * @param str * @return */ public static String ConvertStr(String str) { return str != null && !"null".equals(str) ? str.trim() : ""; } public static void main(String[] args){ System.out.println(isNum("a")); System.out.println(isNum("-1")); System.out.println(isNum("01")); System.out.println(isNum("1E3")); System.out.println(isNum("1.a")); System.out.println(isLong("014650")); System.out.println(Long.parseLong("014650")); }}阅读全文
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