字符串工具类

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/** @(#)StringUtil.java1.0 2005-10-19** Copyright 2003 - 2006 BeanSoft Studio. All rights reserved.*/ import java.io.IOException;import java.io.UnsupportedEncodingException;import java.text.ParseException;import java.util.Date; import beansoft.util.OS; /*** StringUtilExpress, 字符串工具类, 一些方便的字符串工具方法. 不包含 Servlet 处理工具.* Used by Applet.** Dependencies: None.** @author beansoft* @version 1.1 2005-10-19*/public class StringUtilExpress {/*** 获取类路径中的资源文件的物理文件路径.* NOTE: 仅在 Win32 平台下测试通过开发.* @date 2005.10.16* @param resourcePath 资源路径* @return 配置文件路径*/public static String getRealFilePath(String resourcePath) {java.net.URL inputURL = StringUtilExpress.class.getResource(resourcePath); String filePath = inputURL.getFile(); // For windows platform, the filePath will like this:// /E:/Push/web/WEB-INF/classes/studio/beansoft/smtp/MailSender.ini// So must remove the first / if(OS.isWindows() && filePath.startsWith("/")) {filePath = filePath.substring(1);} return filePath;} /*** 将字符串转换为 int.** @param input* 输入的字串* @date 2005-07-29* @return 结果数字*/public static int parseInt(String input) {try {return Integer.parseInt(input);} catch (Exception e) {// TODO: handle exception}return 0;} /*** 格式化日期到日时分秒时间格式的显示. d日 HH:mm:ss** @return - String 格式化后的时间*/public static String formatDateToDHMSString(java.util.Date date) {if (date == null) {return "";} java.text.SimpleDateformat dateformat = new java.text.SimpleDateformat("d日 HH:mm:ss"); return dateformat.format(date); } /*** 格式化日期到时分秒时间格式的显示.** @return - String 格式化后的时间*/public static String formatDateToHMSString(java.util.Date date) {if (date == null) {return "";} java.text.SimpleDateformat dateformat = new java.text.SimpleDateformat("HH:mm:ss"); return dateformat.format(date); } /*** 将时分秒时间格式的字符串转换为日期.** @param input* @return*/public static Date parseHMSStringToDate(String input) {java.text.SimpleDateformat dateformat = new java.text.SimpleDateformat("HH:mm:ss"); try {return dateformat.parse(input);} catch (ParseException e) {e.printStackTrace();} return null;} /*** 格式化日期到 Mysql 数据库日期格式字符串的显示.** @return - String 格式化后的时间*/public static String formatDateToMysqlString(java.util.Date date) {if (date == null) {return "";} java.text.SimpleDateformat dateformat = new java.text.SimpleDateformat("yyyy-MM-dd HH:mm:ss"); return dateformat.format(date); } /*** 将 Mysql 数据库日期格式字符串转换为日期.** @param input* @return*/public static Date parseStringToMysqlDate(String input) {java.text.SimpleDateformat dateformat = new java.text.SimpleDateformat("yyyy-MM-dd HH:mm:ss"); try {return dateformat.parse(input);} catch (ParseException e) {e.printStackTrace();} return null;} /*** 返回时间字符串, 可读形式的, M月d日 HH:mm 格式. 2004-09-22, LiuChangjiong** @return - String 格式化后的时间*/public static String formatDateToMMddHHmm(java.util.Date date) {if (date == null) {return "";} java.text.SimpleDateformat dateformat = new java.text.SimpleDateformat("M月d日 HH:mm"); return dateformat.format(date);} /*** 返回时间字符串, 可读形式的, yy年M月d日HH:mm 格式. 2004-10-04, LiuChangjiong** @return - String 格式化后的时间*/public static String formatDateToyyMMddHHmm(java.util.Date date) {if (date == null) {return "";} java.text.SimpleDateformat dateformat = new java.text.SimpleDateformat("yy年M月d日HH:mm"); return dateformat.format(date);} /*** 生成一个 18 位的 yyyyMMddHHmmss.SSS 格式的日期字符串.** @param date* Date* @return String*/public static String genTimeStampString(Date date) {java.text.SimpleDateformat df = new java.text.SimpleDateformat("yyyyMMddHHmmss.SSS");return df.format(date);} /*** 将字符串 source 中的 oldStr 替换为 newStr, 并以大小写敏感方式进行查找** @param source* 需要替换的源字符串* @param oldStr* 需要被替换的老字符串* @param newStr* 替换为的新字符串*/public static String replace(String source, String oldStr, String newStr) {return replace(source, oldStr, newStr, true);} /*** 将字符串 source 中的 oldStr 替换为 newStr, matchCase 为是否设置大小写敏感查找** @param source* 需要替换的源字符串* @param oldStr* 需要被替换的老字符串* @param newStr* 替换为的新字符串* @param matchCase* 是否需要按照大小写敏感方式查找*/public static String replace(String source, String oldStr, String newStr,boolean matchCase) {if (source == null) {return null;}// 首先检查旧字符串是否存在, 不存在就不进行替换if (source.toLowerCase().indexOf(oldStr.toLowerCase()) == -1) {return source;}int findStartPos = 0;int a = 0;while (a > -1) {int b = 0;String str1, str2, str3, str4, strA, strB;str1 = source;str2 = str1.toLowerCase();str3 = oldStr;str4 = str3.toLowerCase();if (matchCase) {strA = str1;strB = str3;} else {strA = str2;strB = str4;}a = strA.indexOf(strB, findStartPos);if (a > -1) {b = oldStr.length();findStartPos = a + b;StringBuffer bbuf = new StringBuffer(source);source = bbuf.replace(a, a + b, newStr) + "";// 新的查找开始点位于替换后的字符串的结尾findStartPos = findStartPos + newStr.length() - b;}}return source;} /*** 清除字符串结尾的空格.** @param input* String 输入的字符串* @return 转换结果*/public static String trimTailSpaces(String input) {if (isEmpty(input)) {return "";} String trimedString = input.trim(); if (trimedString.length() == input.length()) {return input;} return input.substring(0, input.indexOf(trimedString)+ trimedString.length());} /*** Change the null string value to "", if not null, then return it self, use* this to avoid display a null string to "null".** @param input* the string to clear* @return the result*/public static String clearNull(String input) {return isEmpty(input) ? "" : input;} /*** Return the limited length string of the input string (added at:April 10,* 2004).** @param input* String* @param maxLength* int* @return String processed result*/public static String limitStringLength(String input, int maxLength) {if (isEmpty(input))return ""; if (input.length() <= maxLength) {return input;} else {return input.substring(0, maxLength - 3) + "...";} } /*** 将字符串转换为一个 javascript 的 alert 调用. eg: htmlAlert("What?"); returns* <SCRIPT language="javascript">alert("What?")</SCRIPT>** @param message* 需要显示的信息* @return 转换结果*/public static String scriptAlert(String message) {return "<SCRIPT language=/"javascript/">alert(/"" + message+ "/");</SCRIPT>";} /*** 将字符串转换为一个 javascript 的 document.location 改变调用. eg: htmlAlert("a.jsp");* returns <SCRIPT* language="javascript">document.location="a.jsp";</SCRIPT>** @param url* 需要显示的 URL 字符串* @return 转换结果*/public static String scriptRedirect(String url) {return "<SCRIPT language=/"javascript/">document.location=/"" + url+ "/";</SCRIPT>";} /*** 返回脚本语句 <SCRIPT language="javascript">history.back();</SCRIPT>** @return 脚本语句*/public static String scriptHistoryBack() {return "<SCRIPT language=/"javascript/">history.back();</SCRIPT>";} /*** 滤除帖子中的危险 HTML 代码, 主要是脚本代码, 滚动字幕代码以及脚本事件处理代码** @param content* 需要滤除的字符串* @return 过滤的结果*/public static String replaceHtmlCode(String content) {if (isEmpty(content)) {return "";}// 需要滤除的脚本事件关键字String[] eventKeywords = { "onmouseover", "onmouseout", "onmousedown","onmouseup", "onmousemove", "onclick", "ondblclick","onkeypress", "onkeydown", "onkeyup", "ondragstart","onerrorupdate", "onhelp", "onreadystatechange", "onrowenter","onrowexit", "onselectstart", "onload", "onunload","onbeforeunload", "onblur", "onerror", "onfocus", "onresize","onscroll", "oncontextmenu" };content = replace(content, "<script", "&ltscript", false);content = replace(content, "</script", "&lt/script", false);content = replace(content, "<marquee", "&ltmarquee", false);content = replace(content, "</marquee", "&lt/marquee", false);content = replace(content, "/r/n", "<BR>");// 滤除脚本事件代码for (int i = 0; i < eventKeywords.length; i++) {content = replace(content, eventKeywords[i],"_" + eventKeywords[i], false); // 添加一个"_", 使事件代码无效}return content;} /*** 滤除 HTML 代码为文本代码.*/public static String replaceHtmlToText(String input) {if (isEmpty(input)) {return "";}return setBr(setTag(input));} /*** 滤除 HTML 标记.* 因为 XML 中转义字符依然有效, 因此把特殊字符过滤成中文的全角字符.* @author beansoft* @param s 输入的字串* @return 过滤后的字串*/public static String setTag(String s) {int j = s.length();StringBuffer stringbuffer = new StringBuffer(j + 500);char ch;for (int i = 0; i < j; i++) {ch = s.charAt(i);if (ch == '<') {//stringbuffer.append("<");stringbuffer.append("〈");} else if (ch == '>') {//stringbuffer.append(">");stringbuffer.append("〉");} else if (ch == '&') {//stringbuffer.append("&");stringbuffer.append("〃");} else if (ch == '%') {//stringbuffer.append("%%");stringbuffer.append("※");} else {stringbuffer.append(ch);}} return stringbuffer.toString();} /** 滤除 BR 代码 */public static String setBr(String s) {int j = s.length();StringBuffer stringbuffer = new StringBuffer(j + 500);for (int i = 0; i < j; i++) { if (s.charAt(i) == '/n' || s.charAt(i) == '/r') {continue;} else {stringbuffer.append(s.charAt(i));}} return stringbuffer.toString();} /** 滤除空格 */public static String setNbsp(String s) {int j = s.length();StringBuffer stringbuffer = new StringBuffer(j + 500);for (int i = 0; i < j; i++) {if (s.charAt(i) == ' ') {stringbuffer.append(" ");} else {stringbuffer.append(s.charAt(i) + "");}}return stringbuffer.toString();} /*** 判断字符串是否全是数字字符.** @param input* 输入的字符串* @return 判断结果, true 为全数字, false 为还有非数字字符*/public static boolean isNumeric(String input) {if (isEmpty(input)) {return false;} for (int i = 0; i < input.length(); i++) {char charAt = input.charAt(i); if (!Character.isDigit(charAt)) {return false;}}return true;} /*** 转换由表单读取的数据的内码(从 ISO8859 转换到 gb2312).** @param input* 输入的字符串* @return 转换结果, 如果有错误发生, 则返回原来的值*/public static String toChi(String input) {try {byte[] bytes = input.getBytes("ISO8859-1");return new String(bytes, "GBK");} catch (Exception ex) {}return input;} /*** 转换由表单读取的数据的内码到 ISO(从 GBK 转换到ISO8859-1).** @param input* 输入的字符串* @return 转换结果, 如果有错误发生, 则返回原来的值*/public static String toISO(String input) {return changeEncoding(input, "GBK", "ISO8859-1");} /*** 转换字符串的内码.** @param input* 输入的字符串* @param sourceEncoding* 源字符集名称* @param targetEncoding* 目标字符集名称* @return 转换结果, 如果有错误发生, 则返回原来的值*/public static String changeEncoding(String input, String sourceEncoding,String targetEncoding) {if (input == null || input.equals("")) {return input;} try {byte[] bytes = input.getBytes(sourceEncoding);return new String(bytes, targetEncoding);} catch (Exception ex) {}return input;} /*** 将单个的 ' 换成 ''; SQL 规则:如果单引号中的字符串包含一个嵌入的引号,可以使用两个单引号表示嵌入的单引号.*/ public static String replaceSql(String input) {return replace(input, "'", "''");} /*** 对给定字符进行 URL 编码*/public static String encode(String value) {if (isEmpty(value)) {return "";} try {value = java.net.URLEncoder.encode(value, "GB2312");} catch (Exception ex) {ex.printStackTrace();} return value;} /*** 对给定字符进行 URL 解码** @param value* 解码前的字符串* @return 解码后的字符串*/public static String decode(String value) {if (isEmpty(value)) {return "";} try {return java.net.URLDecoder.decode(value, "GB2312");} catch (Exception ex) {ex.printStackTrace();} return value;} /*** 判断字符串是否未空, 如果为 null 或者长度为0, 均返回 true.*/public static boolean isEmpty(String input) {return (input == null || input.length() == 0);} /*** 获得输入字符串的字节长度(即二进制字节数), 用于发送短信时判断是否超出长度.** @param input* 输入字符串* @return 字符串的字节长度(不是 Unicode 长度)*/public static int getBytesLength(String input) {if (input == null) {return 0;} int bytesLength = input.getBytes().length; //System.out.println("bytes length is:" + bytesLength); return bytesLength;} /*** 检验字符串是否未空, 如果是, 则返回给定的出错信息.** @param input* 输入的字符串* @param errorMsg* 出错信息* @return 空串返回出错信息*/public static String isEmpty(String input, String errorMsg) {if (isEmpty(input)) {return errorMsg;} else {return "";}} /*** 得到文件的扩展名.** @param fileName* 需要处理的文件的名字.* @return the extension portion of the file's name.*/public static String getExtension(String fileName) {if (fileName != null) {int i = fileName.lastIndexOf('.');if (i > 0 && i < fileName.length() - 1) {return fileName.substring(i + 1).toLowerCase();}}return "";} /*** 得到文件的前缀名. * @date 2005-10-18** @param fileName* 需要处理的文件的名字.* @return the prefix portion of the file's name.*/public static String getPrefix(String fileName) {if (fileName != null) { fileName = fileName.replace('//', '/'); if(fileName.lastIndexOf("/") > 0) { fileName = fileName.substring(fileName.lastIndexOf("/") + 1, fileName.length()); } int i = fileName.lastIndexOf('.');if (i > 0 && i < fileName.length() - 1) {return fileName.substring(0, i);}}return "";} /** * 得到文件的短路径, 不保护目录. * @date 2005-10-18 * * @param fileName * 需要处理的文件的名字. * @return the short version of the file's name. */ public static String getShortFileName(String fileName) { if (fileName != null) { fileName = fileName.replace('//', '/'); if(fileName.lastIndexOf("/") > 0) { fileName = fileName.substring(fileName.lastIndexOf("/") + 1, fileName.length()); } return fileName; } return ""; } /*** Gets the absolute pathname of the class or resource file containing the* specified class or resource name, as prescribed by the current classpath.** @param resourceName* Name of the class or resource name.* @return the absolute pathname of the given resource*/public static String getPath(String resourceName) { if (!resourceName.startsWith("/")) {resourceName = "/" + resourceName;} //resourceName = resourceName.replace('.', '/'); java.net.URL classUrl = new StringUtilExpress().getClass().getResource(resourceName); if (classUrl != null) {//System.out.println("/nClass '" + className +//"' found in /n'" + classUrl.getFile() + "'");//System.out.println("/n资源 '" + resourceName +//"' 在文件 /n'" + classUrl.getFile() + "' 中找到."); return classUrl.getFile();} else {//System.out.println("/nClass '" + className +//"' not found in /n'" +//System.getProperty("java.class.path") + "'");//System.out.println("/n资源 '" + resourceName +//"' 没有在类路径 /n'" +//System.getProperty("java.class.path") + "' 中找到");return null;}} /*** 将日期转换为中文表示方式的字符串(格式为 yyyy年MM月dd日 HH:mm:ss).*/public static String dateToChineseString(Date date) {if (date == null) {return null;} java.text.SimpleDateformat dateformat = new java.text.SimpleDateformat("yyyy年MM月dd日 HH:mm:ss"); return dateformat.format(date);} /*** 将日期转换为 14 位的字符串(格式为yyyyMMddHHmmss).*/public static String dateTo14String(Date date) {if (date == null) {return null;} java.text.SimpleDateformat dateformat = new java.text.SimpleDateformat("yyyyMMddHHmmss"); return dateformat.format(date);} /*** 将 14 位的字符串(格式为yyyyMMddHHmmss)转换为日期.*/public static Date string14ToDate(String input) {if (isEmpty(input)) {return null;} if (input.length() != 14) {return null;} java.text.SimpleDateformat dateformat = new java.text.SimpleDateformat("yyyyMMddHHmmss"); try {return dateformat.parse(input);} catch (Exception ex) {ex.printStackTrace();} return null;} /*** 将 TEXT 文本转换为 HTML 代码, 已便于网页正确的显示出来.** @param input* 输入的文本字符串* @return 转换后的 HTML 代码*/public static String textToHtml(String input) {if (isEmpty(input)) {return "";} input = replace(input, "<", "<");input = replace(input, ">", ">"); input = replace(input, "/n", "<br>/n");input = replace(input, "/t", " ");input = replace(input, " ", " "); return input;} // Test only.public static void main(String[] args) throws Exception {//System.out.println(textToHtml("1<2/r/n<b>Bold</b>"));//System.out.println(scriptAlert("oh!"));//System.out.println(scriptRedirect("http://localhost/"));// System.out.println(StringUtil.getPath("/databaseconfig.properties"));//java.io.File file = new java.io.File("e://Moblog//abcd//");////file.mkdir();Date time = (parseHMSStringToDate("12:23:00"));System.out.println(time.toLocaleString());Date nowTime = parseHMSStringToDate(formatDateToHMSString(new Date()));System.out.println(nowTime.toLocaleString()); //GregorianCalendar cal = new GregorianCalendar();//cal.setTime(new Date());//cal.add(cal.YEAR, -cal.get(cal.YEAR) + 1970);//cal.add(cal.MONTH, -cal.get(cal.MONTH));//cal.add(cal.DATE, -cal.get(cal.DATE) + 1);////System.out.println(cal.getTime().toLocaleString());}}