常用的与字符串相关的函数总结StringUtil

StringUtil.java


package util;




import java.util.Arrays;


import java.sql.Timestamp;




public class StringUtil ...{


//j将字符串第一个字母变成大写


public static String toTitle(String str,boolean toTrim)




...{


if (str==null)return null;


char ch[]=toTrim?str.trim().toCharArray():str.trim().toCharArray();


char ch0=Character.toUpperCase(ch[0]);


ch[0]=ch0;


str=new String(ch);


return str;


}


//获取合法的xml字符串




public static String getLegalXMLString(String str) throws AppException ...{




if (str != null && str.trim().length() != 0) ...{


str = str.replaceAll("&", "&");


str = str.replaceAll("<", "<");


str = str.replaceAll(">", ">");


// str=str.replaceAll("'","'");


str = str.replaceAll(""", """);




} else ...{


str = "";


}


return str;


}


//获取合法的javascript字符串




public static String getLegalJSString(String str) throws AppException ...{


// 把(' " )--->(' " /)用以js中的


char strchar[] = str.toCharArray();


String strstr = "";




if (str != null && str.trim().length() != 0) ...{




for (int i = 0; i < str.length(); i++) ...{




if (Character.toString(strchar[i]).equals("'")) ...{


strstr += "/'";




} else if (Character.toString(strchar[i]).equals(""")) ...{


strstr += "/"";




} else if (Character.toString(strchar[i]).equals("/")) ...{


strstr += "//";




} else ...{


strstr += Character.toString(strchar[i]);


}


}




} else ...{


strstr = "";


}


return strstr;


}




//判断字符串是否为空


public static boolean isEmpty(String str)




...{


if(str==null||str.trim().length()==0)


return true;


return false;


}


//判断字符串是否整数的形式




public static boolean isInt(String num) ...{




try ...{


Integer.parseInt(num);




} catch (Exception e) ...{


return false;


}


return true;


}


//判断字符串是否长整形的形式




public static boolean isLong(String num) ...{




try ...{


Long.parseLong(num);




} catch (Exception e) ...{


return false;


}


return true;


}


//判断字符串是否双精度的形式




public static boolean isDouble(String num) ...{




try ...{


Double.parseDouble(num);




} catch (Exception e) ...{


return false;


}


return true;


}


//判断字符串是否浮点的形式




public static boolean isFloat(String num) ...{




try ...{


Float.parseFloat(num);




} catch (Exception e) ...{


return false;


}


return true;


}


//判断字符串是否时间戳类型


public static boolean isTimestamp(String str)




...{


try




...{


Timestamp.valueOf(str);


}


catch(Exception e)




...{


return false;


}


return true;


}




//将字符串数字组合成显式的表达该字符串数组的一个字符串




public static String arrayToString(String[] array) ...{


return Arrays.toString(array);


}


//将显示表达一个字符串数组的字符串转换成字符串数组




public static String[] stringToArray(String str) ...{




if (str != null&&!str.equals("null")) ...{


str = str.replaceAll("^/[|/]$|/s", "");


return str.split(",");


}


return null;


}






}