tcp 工具类

package common; import java.io.File; import java.io.UnsupportedEncodingException; import java.net.Inet4Address; import java.util.ArrayList; import java.util.HashMap; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Set; import java.util.regex.Matcher; import java.util.regex.Pattern; public class StringUtil { public static final String NEW_LINE = "\n";// 换行ç¬? public static final String NEW_LINE_MARK = "#@n#";// 换行标示 /** * @param args */ public static void main(String[] args) { System.out.print(StringUtil.getGBKSubString(" 22", 0, 4)); } public static String replaceBlank(String str) { String dest = ""; if (str != null) { Pattern p = Pattern.compile("\t|\r|\n"); Matcher m = p.matcher(str); dest = m.replaceAll(""); } return dest; } public static Set<Integer> splitString(String str, String split) { String[] arr = str.split(split); Set<Integer> set = new HashSet<Integer>(); for (int i = 0; i < arr.length; i++) { if (StringUtil.isNotNull(arr[i])) set.add(Integer.parseInt(arr[i])); } return set; } public static List<String> splitStringToArrayList(String str, String split) { List<String> list = new ArrayList<String>(); if (StringUtil.isNotNull(str)) { String[] arr = str.split(split); for (int i = 0; i < arr.length; i++) { if (StringUtil.isNotNull(arr[i])) list.add(arr[i]); } } return list; } public static String convertSetToString(Set<Integer> set) { StringBuffer str = new StringBuffer(); if (!set.isEmpty()) { int i = 1; Iterator<Integer> iterator = (Iterator<Integer>) set.iterator(); while (iterator.hasNext()) { str.append(Integer.toString(iterator.next())); if (i < set.size()) str.append(","); i++; } } return str.toString(); } public static String getFileDir(String filePath) { int i = filePath.lastIndexOf(File.separator); return filePath.substring(0, i + 1); } public static String getFileName(String filePath) { int i = filePath.lastIndexOf(File.separator); return filePath.substring(i + 1, filePath.length()); } public static ArrayList<Integer> getAllPosition(String str, String c) { ArrayList<Integer> allPos = new ArrayList<Integer>(); for (int i = 0; i < str.length(); i++) { if (str.substring(i, i + 1).equals(c)) allPos.add(i); } return allPos; } public static boolean isNull(String str) { if (str == null || "".equals(str.trim())) { return true; } return false; } public static boolean isInteger(String str) { try { Integer.parseInt(str); return true; } catch (Exception exception) { return false; } } public static boolean isNotNull(String str) { return !isNull(str); } public static String nullToString(String str) { if (str == null || "".equals(str.trim()) || "null".equals(str)) { return ""; } return str.trim(); } public static String replaseToNewLine(String str) { str = StringUtil.nullToString(str); String newStr = str.replaceAll(NEW_LINE_MARK, NEW_LINE); return newStr; } /** * 换行 * * @param line * 行数 * @return */ public static String getNewLine(int line) { StringBuffer newStr = new StringBuffer(); for (int i = 0; i < line; i++) { newStr.append(NEW_LINE); } return newStr.toString(); } public static String getGBKSubString(String str, int start, int end) { if (str == null) return ""; byte b[]; try { b = str.getBytes("GBK"); if (end > b.length) end = b.length; if (start < 0 || start > b.length || start > end || end < 0) return ""; else { int counterOfDoubleByte = 0; for (int i = 0; i < start; i++) { if (b[i] < 0) counterOfDoubleByte++; } if (counterOfDoubleByte % 2 != 0) start = start - 1; counterOfDoubleByte = 0; for (int i = 0; i < end; i++) { if (b[i] < 0) counterOfDoubleByte++; } if (counterOfDoubleByte % 2 != 0) end = end - 1; return new String(b, start, end - start, "GBK"); } } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); return ""; } } public static String getConvert3gpString(String str, int limitLength, String suffix) { try { return getLimitLengthString(str, limitLength, suffix); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return str; } public static String getLimitLengthString(String str, int len, String symbol) throws UnsupportedEncodingException { int counterOfDoubleByte = 0; byte b[] = str.getBytes("GBK"); if (b.length <= len) return str; for (int i = 0; i < len; i++) { if (b[i] < 0) counterOfDoubleByte++; } if (counterOfDoubleByte % 2 == 0) return new String(b, 0, len, "GBK") + symbol; else return new String(b, 0, len - 1, "GBK") + symbol; } private static char mapTable[] = { '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', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' }; /** * des:生成随机验证ç ? * * @param length * 验证码长åº? * @return */ public static String getVerifiCode(int length) { StringBuffer str = new StringBuffer(); for (int i = 0; i < length; ++i) { str.append(mapTable[(int) (mapTable.length * Math.random())]); } return str.toString(); } /** * 解析前台传来的æ?§åˆ«å­—符串为数据库插入用的intå€? ç”?->1;å¥?->0; male->1;female->0; 若未能识别，则默认为男æ?? * * @param sexString * @return */ public static int parseSexString(String sexStr) { if (sexStr.equals("å¥?") || sexStr.toLowerCase().equals("female") || sexStr.equals("0")) { return 0; } return 1; } public static boolean isPic(String fileName) { String suffix = fileName.substring(fileName.lastIndexOf(".")) .toLowerCase(); if (suffix.equals(".jpg") || suffix.equals(".png") || suffix.equals(".gif")) return true; else return false; } /** * 替换html代码中特殊符å? * * @param str * @return */ public static String replaceHtmlSpecialCharS(String html) { return html.replaceAll("&", "&amp;").replaceAll("<", "&lt;") .replaceAll(">", "&gt;").replaceAll("\"", "&quot;"); } /** * 将list集合转为','分割的字符串 * * @param list * @return */ public static final String List2CommaStr(List<?> list) { StringBuilder sb = new StringBuilder(); for (Object object : list) { sb.append(object.toString()).append(","); } if (sb.length() > 0) { sb.setLength(sb.length() - 1); } return sb.toString(); } /** * 取得文件扩展å? * @param filename * @return */ public static final String fileExName(String filename) { if (isNull(filename)) { return null; } String[] splits = filename.split("[.]"); if (splits.length<2) { return null; } return splits[splits.length-1].toLowerCase(); } public static int doubleSubInt(String number){ int index=number.indexOf("."); return Integer.parseInt(number.substring(0,index)); } public static String doubleSubString(String number){ String retValue=""; if(number.lastIndexOf("-")>0){ retValue=number; }else{ int index=number.indexOf("."); retValue=number.substring(0,index); } return retValue; } public static boolean isOR(String str){ if("or".equals(str.substring(0,2))){ return true; } return false; } public static int getNumberReplace(String str,char ch){ int count=0; char c[] = str.toCharArray(); for(int i=0;i<c.length;i++){ //记录<