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Java String字符串处理判断工具类

本文主要介绍Java中,String字符串处理判断等工具类。

package com.wonhero.utils.util;import com.alibaba.fastjson.JSONObject;import java.io.UnsupportedEncodingException;import java.util.Date;import java.util.regex.Pattern;/** * String的工具类 * * @see StringUtil * @since */public class StringUtil {    /**     * Description: 格式化字符串(用户组建表使用) 
* * @param name * @return String */ public static String formatString(String name) { String s = "0000000000" + name; return s.substring(s.length() - 10, s.length()); } /** * Description:把GBK转码成ISO8859_1
* * @param name * @return String */ public static String getStringByISO(String name) { try { // 防止中文字符出现乱码 name = new String(name.getBytes("GBK"), "ISO8859_1"); } catch (UnsupportedEncodingException e2) { } return name; } /** * Description:获得格式化的url
* * @param url * @return String */ public static String getFormatUrl(String url) { if (isNullOrNone(url)) { return ""; } if (url.indexOf('?') == -1) { return url + '?'; } else { return url + '&'; } } /** * Description: 获得字符(byte)的实际长度
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* * @param s * @return int * @exception/throws */ public static int lengthByte(String s) { int length = 0; for (int i = 0; i < s.length(); i++) { if (s.charAt(i) <= 127) { length++; } else { length = length + 2; } } return length; } /** * Description: 在jdbc用thin客户端连接oracle里面中文算3个字符
* * @param s * @return int * @exception/throws */ public static int lengthByteInPrepared(String s) { int length = 0; if (s == null) { return length; } for (int i = 0; i < s.length(); i++) { if (s.charAt(i) <= 127) { length++; } else { length = length + 3; } } return length; } /** * Description:判断字段空null
* * @param s * @return boolean */ public static boolean isNullOrNone(String s) { if (s == null || "".equals(s.trim())) { return true; } return false; } /** * Description: 判断对象是否为空
* * @param obj * @return boolean * @exception/throws [违例类型] [违例说明] */ public static boolean isNullOrNone(Object obj) { if (obj == null) { return true; } if (obj instanceof String) { return isNullOrNone((String) obj); } return false; } /** * Description:判断字段空null
* * @param ss * @return boolean */ public static boolean isNullOrNone(String[] ss) { if (ss == null || ss.length == 0) { return true; } for (int i = 0; i < ss.length; i++) { if (ss[i] == null || "".equals(ss[i].trim())) { return true; } } return false; } public static int countChar(String src, char c) { if (isNullOrNone(src)) { return 0; } int k = 0; for (int i = 0; i < src.length(); i++) { if (src.charAt(i) == c) { k++; } } return k; } /** * 把'变成 '' * * @param src * @return */ public static String oracleString(String src) { if (isNullOrNone(src)) { return ""; } return src.replaceAll("'", "''"); } /** * 替换函数 * * @param source * @param find * @param rep * @return String */ public static String replace(String source, String find, String rep) { String result = source; String begin = ""; String end = ""; int flag; flag = result.indexOf(find, 0); while (flag != -1) { begin = result.substring(0, flag); end = result.substring(flag + (find.length()), result.length()); result = begin + rep + end; flag = result.indexOf(find, flag + rep.length()); } return result; } /** * 保护截断 * * @param s * @param begin * @param end * @return */ public static String truncate(String s, int begin, int end) { if (isNullOrNone(s)) { return ""; } if (begin < 0) { return ""; } if (begin >= end) { return ""; } s = s.trim(); if (begin >= s.length()) { return ""; } if (end >= s.length()) { return s; } else { return s.substring(begin, end); } } /** * Description: 判断是否为数字
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* * @param str * @return boolean * @exception/throws [违例类型] [违例说明] */ public static boolean isNumber(String str) { if (null == str || "".equals(str)) { return false; } else { return Pattern.matches("^[0-9]+$", str); } } public static boolean isInteger(String str) { try { double value = Double.parseDouble(str); if (value == Math.ceil(value)) { return true; } } catch (Exception e) { return false; } return false; } /** * Description: 获得字符(byte)的实际长度
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* * @param s * @return int * @exception/throws */ public static int realLength(String s) { if (null == s || "".equals(s)) { return 0; } else { return s.getBytes().length; } } /** * Description: 检查非法字符
*/ public static boolean isUnlawfulChar(String s) { if (null == s || "".equals(s)) { return false; } else { return Pattern.matches("^[^`~@#\\$%\\^&\\*\\(\\)=\\!\\+\\\\/\\|<>\\?;\\:\\.'\"\\{\\}\\[\\]??, ]*$", s); } } /** * Description: 判断是否为字母
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* * @param str * @return boolean * @exception/throws [违例类型] [违例说明] */ public static boolean isLetter(String str) { if (null == str || "".equals(str)) { return false; } else { return Pattern.matches("^[A-Za-z]+$", str); } } /** * (source != null) ? source : "";相当于oracle的nvl函数 * * @param source * @return String */ public static String nvl(String source) { return (source != null) ? source.trim() : ""; } /** * Method nvl. * * @param source String * @param defaultString String * @return String */ public static String nvl(String source, String defaultString) { return (source != null) ? source.trim() : defaultString; } /** * 实现对符合条件的字符串的反转 * * @param str 原始字符串 * @return 经过反转处理后的字符串 */ public static String reverseString(String str) { StringBuffer resultStringBuffer = new StringBuffer(); String[] allStr = str.split(" "); StringBuffer sb = new StringBuffer(); // 保存需要进行反转的字符串 for (int i = 0; i < allStr.length; i++) { if (meetReverseCondition(allStr[i])) { sb.delete(0, sb.length()); // 将需要反转的字符串反转后添加到结果字符串 resultStringBuffer.append(sb.append(allStr[i]).reverse()).append(" "); } else { resultStringBuffer.append(allStr[i]).append(" "); } } return resultStringBuffer.deleteCharAt(resultStringBuffer.length() - 1).toString(); } /** * 判断字符串是否符合反转条件 本函数被reverseString(String str)调用 * * @param str 需要进行反转处理的字符串 * @return true 符合反转条件 false 不符合反转条件 */ private static boolean meetReverseCondition(String str) { // 如果字符串是以'*'开头并且长度大于1,并且第二个字符是英文,汉字或数字 return (str.charAt(0) == '*') && (str.length() > 1) && Character.isLetterOrDigit(str.charAt(1)); } /** * 取字符串的前maxLength长度的字串(一个中文字符为2个长度) * * @param str * @param maxLength * @return String throws */ public static String splitStr(String str, int maxLength) { if (maxLength <= 0) { return ""; } String result = str; byte[] bytes = str.getBytes(); if (bytes.length > maxLength) { result = new String(bytes, 0, maxLength); if (!result.substring(result.length() - 1).equals(str.substring(result.length() - 1, result.length()))) { result = new String(bytes, 0, maxLength - 1); } } return result; } /** * 判断是否存在 * * @param filterStr * @param id * @return boolean */ public static boolean isExists(String filterStr, String id) { String[] filterTag = filterStr.split(","); for (int i = 0; i < filterTag.length; i++) { if (id.equals(filterTag[i])) { return true; } } return false; } /** * 格式化时间 * * @param dt * @param format * @return String */ public static String getTime(Date dt, String format) { String time = null; java.text.DateFormat df = new java.text.SimpleDateFormat(format); time = df.format(dt); return time; } public static String[] stringToArray(String str, String start, String end, String split) { if (null == str || "".equals(str)) return null; if (str.indexOf(start) == -1 || str.indexOf(end) == -1 || str.indexOf(split) == -1) return new String[]{str}; return str.substring(str.indexOf(start) + 1, str.indexOf(end)).split(split); } /** * 判断字符串是否为null或者空 * * @param str * @return */ public static boolean isEmpty(String str) { return str == null || "".equals(str.trim()); } /** * 校验是否为JSON * * @param msg * @return */ public static Boolean isJsonObject(String msg) { try { JSONObject.parseObject(msg); } catch (Exception e) { return false; } return true; } /** * 获取指定长度(按字节长度获取)的字符串,中文算2个字节长度,兼容oracle的 varchar2长度计算方式 * * @param src 源字符串 * @param length 长度 * @return */ public static String getSubStr(String src, int length) { if (StringUtil.isEmpty(src)) { return null; } byte[] b = src.getBytes(); if (b.length > length) { byte[] s = new byte[length]; for (int i = 0; i < length; i++) { s[i] = b[i]; } return new String(s); } else { return src; } } public static String truncateMessage(String description, int length) { org.springframework.util.Assert.state(length > 0); if ((description != null) && (description.length() > length)) { return description.substring(0, length); } return description; } /** * json是否包含key 并且存在值 * * @param param * @param key * @return */ public static boolean jsonHasKayAndValue(JSONObject param, String key) { if (param == null) { return false; } if (!param.containsKey(key)) { return false; } if (isEmpty(param.getString(key))) { return false; } return true; } /** * json是否包含key 并且存在值 * * @param param * @param key * @return */ public static boolean jsonHasKayAndValue(String param, String key) { JSONObject paramObj = null; try { paramObj = JSONObject.parseObject(param); return jsonHasKayAndValue(paramObj, key); } catch (Exception e) { return false; } } public static String delHtmlTag(String str){ String newstr = ""; newstr = str.replaceAll("<[.[^>]]*>",""); newstr = newstr.replaceAll(" ", ""); return newstr; }}

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