在我参与的项目里面，我总喜欢把对一些细节处理的代码放在叫utils的根包下面，碰到要用的时候就直接调用，节省了好多开发的时间。这些年来，我从网络收集和自己编码的有很多，有些我都不知道放在电脑什么位置了，把有些拿出来做个网络笔记免得以后什么都没有了，我这个人比较邋遢了，唉！
private static char[] ch = 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i','j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v','w', 'x', 'y', 'z' }; public static String RandStrings(int len) { Random r = new Random(); String tmp = ""; for (int i = 0; i < len; i++) { int d = r.nextInt(ch.length); tmp = tmp + ch[d]; } return tmp; } /** * * 获取当前时间 * * @param male * @return */ public static Date getCurrentDateForDate() throws Exception { SimpleDateFormat sf = new SimpleDateFormat("yyyy-mm-dd HH:ss:mm"); Date date = sf.parse(Utils.getCurrentDate()); return date; } /** * 把第一次出现html的字符串之前的字符串清除掉 * * @param sourceString * 源字符串 * @return 清除后的字符串 */ public static String SpecialString(String sourceString) { String w3chtml = ""; if (sourceString == null){ return w3chtml; }else{ int firstIndex = sourceString.indexOf("<html"); //System.out.println(firstIndex); if(firstIndex>=0){ w3chtml = sourceString.substring(firstIndex); } } return w3chtml; } /** * 获取此URL的协议名称 * * @param sourceString * 源字符串 * @return 处理后的字符串 */ public static String getProtocol(String url) { String result = ""; if (url == null){ return result; }else{ try{ URL myURL=new URL(url); result = myURL.getProtocol(); }catch (MalformedURLException e){ e.printStackTrace(); } } return result; } /** * 从访问的URL中获取网站的域名 * * @param sourceString * 源字符串 * @return 处理后的字符串 */ public static String getDomain(String sourceString) { String result = ""; if (sourceString == null){ return result; }else{ String[] domains = sourceString.split("/"); result = domains[0] + "//" + domains[1] + domains[2]; } return result; } /** * 从访问的URL中获取该URL的根目录 * * @param sourceString * 源字符串 * @return 处理后的字符串 */ public static String getLastPath(String sourceString) { String result = ""; String[] domains; if (sourceString == null){ return result; }else{ domains = sourceString.split("/"); result = domains[0]+"//"+domains[1]+domains[2]; } for(int i = 3;i < domains.length-1;i++){ result +="/" + domains[i]; } return result; } public static String getTruePath(String sourceString,int n) { String result = ""; String[] domains; if (sourceString == null){ return result; }else{ domains = sourceString.split("/"); result = domains[0]+"//"+domains[1]+domains[2]; } for(int i = 3;i < domains.length-1-n;i++){ result +="/" + domains[i]; } return result; } public static String getAppath(String sourceString) { String result = ""; String[] domains; if (sourceString == null){ return result; } domains = sourceString.split("[..]{2}+[^.]"); int i = domains.length; result = domains[i-1]; return result; } /** * 判断字符串是否以字母和数字开始 * * @param sourceString * 源字符串 * @return 处理后的结果 */ public static Boolean isLetterOrNumberStart(String sourceString) { Boolean result = false; String regex = "^[a-zA-Z_0-9]"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(sourceString); if (m.find()){ result = true; }else{ result = false; } return result; } /** * 判断字符串是否以一个"/"开始且紧跟后面一个不能也为"/" * * @param sourceString * 源字符串 * @return 处理后的结果 */ public static Boolean isSlashStart(String sourceString) { Boolean result = false; String regex = "^[/]{1}+[^/]"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(sourceString); if (m.find()){ result = true; }else{ result = false; } return result; } /** * 判断字符串"js"结尾 * * @param sourceString * 源字符串 * @return 处理后的结果 */ public static Boolean isJsFile(String sourceString) { Boolean result = false; int len = sourceString.length(); if ("js".equals(sourceString.substring(len-2, len))){ result = true; }else{ result = false; } return result; } public static int DoubleDotNum(String url){ int num = 0; String[] ads=url.split("[..]{2}+[^.]"); int len = ads.length; if(len>0) num=len-1; return num; } /** * 把空值转换为空字符串 * * @param srcString * 源字符串 * @return 非null字符串 */ public static String nullToString(String srcString) { if (srcString == null) return new String(""); else return srcString; } /** * @param value * @param len * @return String */ public static String limitString(String value){ if (value == null) value = ""; String v1 = ""; int l = value.length(); if (l > 6){ v1 = value.substring(0, 5) + "***"; if (l > 9) v1 += value.substring(9); } else{ v1 = value; } return v1; } /** * 将UNICODE转化为utf-8编码(&#xxxx) * * @param srcString * 源字符串 * * @return String UTF8标记字符串 */ public static String toUTF8(String srcString) { char temChr; int ascChr; String rtStr = new String(""); if (srcString == null) srcString = ""; for (int i = 0; i < srcString.length(); i++) { temChr = srcString.charAt(i); ascChr = temChr + 0; rtStr += "&#x" + Integer.toHexString(ascChr) + ";"; } return rtStr; } /** * 把空值替换为指定字符串 * * @param srcString * 源字符串 * @param toString * 用于替换的字符串 * @return 非null字符串 */ public static String nullToString(String srcString, String toString) { if (srcString == null) return toString; else return srcString; } /** * 把字符创转换为布尔类型，默认返回defaultValue * * @param srcString * 源字符串("true"/"false") * @param defaultValue * 默认值 * @return boolean 是否为真 */ public static boolean toBoolean(String srcString, boolean defaultValue) { if (srcString == null) return false; if (srcString.trim().toLowerCase().equals("true")) return true; else return false; } /** * 按 fromCharset 编码读取，以 toCharset 编码格式输出字符串 * * @param srcString * 源字符串 * @param fromCharset * 读取方式编码(UTF-8/GBK/GB2312) * @param toCharset * 输出字符编码(UTF-8/GBK/GB2312) * @return String Charset指定字符串 */ public static String toCharset(String srcString, String fromCharset, String toCharset) { if (srcString == null) return null; try { return new String(srcString.getBytes(fromCharset), toCharset); } catch (Exception e) { return null; } } /** * 把字符串转换为双精度数，默认返回defaultValue * * @param srcString * 源字符串 * @param defaultValue * 默认数值 * @return double 双精度数 */ public static double toDouble(String srcString, double defaultValue) { double dReturn = 0.0D; if (srcString == null || srcString.trim().length() < 1) return defaultValue; try { srcString = srcString.trim().replaceAll(",", ""); dReturn = Double.valueOf(srcString.trim()).doubleValue(); } catch (NumberFormatException e) { dReturn = defaultValue; } return dReturn; } /** * 把字符串转换为浮点数，默认返回defaultValue * * @param srcString * 源字符串 * @param defaultValue * 默认数值 * @return float 浮点数 */ public static float toFloat(String srcString, float defaultValue) { float fReturn = 0.0F; if (srcString == null || srcString.trim().length() < 1) return defaultValue; try { srcString = srcString.trim().replaceAll(",", ""); Double Dv = new Double(Double.valueOf(srcString).doubleValue()); fReturn = Dv.floatValue(); } catch (NumberFormatException e) { fReturn = defaultValue; } return fReturn; } /** * 把字符串转换为整数，默认返回defaultValue * * @param srcString * 源字符串 * @param defaultValue * 默认数值 * @return int 取得的数值 */ public static int toInt(String srcString, int defaultValue) { int iReturn = 0; if (srcString == null || srcString.trim().length() < 1) return defaultValue; try { srcString = srcString.trim().replaceAll(",", ""); Double Dv = new Double(Double.valueOf(srcString).doubleValue()); iReturn = Dv.intValue(); } catch (NumberFormatException e) { iReturn = defaultValue; } return iReturn; } /** * 把字符串转换为整数（四舍五入），默认返回defaultValue * * @param srcString * 源字符串 * @param defaultValue * 默认数值 * @return int 取得的数值 */ public static int toIntRound(String srcString, int defaultValue) { int iReturn = 0; if (srcString == null || srcString.trim().length() < 1) return defaultValue; try { srcString = srcString.trim().replaceAll(",", ""); float fv = Float.valueOf(srcString).floatValue(); iReturn = Math.round(fv); } catch (NumberFormatException e) { iReturn = defaultValue; } return iReturn; } /** * 把某种编码字符串转换为Unicode字符串 * * @param srcString * 源字符串 * @param fromCharset * 读取方式编码(UTF-8/GBK/GB2312) * @return String 被格式化的Unicode字符串 */ public static String toUnicode(String srcString, String fromCharset) { return toCharset(srcString, fromCharset, "ISO-8859-1"); } /** * 以默认编码格式对Unicode字符进行转换 * * @param srcString * 源字符串 * @return String 默认字符编码字符串 */ public static String unicodeToString(String srcString) { try { return new String(srcString.getBytes("ISO-8859-1")); } catch (Exception e) { return null; } } /** * 按 Unicode 编码读取，以 toCharset 编码格式输出字符串 * * @param srcString * 源字符串 * @param toCharset * 输出字符编码(UTF-8/GBK/GB2312) * @return String Charset指定字符串 */ public static String unicodeToString(String srcString, String toCharset) { return toCharset(srcString, "ISO-8859-1", toCharset); } /** * 字符处理类 */ public StringUtil() { }复制到编辑器里面的，懒得整理格式了，我这个人比较懒惰，没有办法，所有现在水平还是那么的烂，呵呵！找到这个文章的你们觉得有用，就挑上看得上的用吧，我是无私地贡献一下代码而已。
