实用字符串处理工具类-优快云博客

本文链接：https://blog.youkuaiyun.com/dhpower/article/details/1472470

package cn.vetech.framework.util;

/**
* 字符串处理类
* @author vesoft
*
*/
import java.util.Random;

public class VeStr {

/**
* 判断一个字符串是否是整数
*
* @param validString
* @return
*/
public static boolean isInteger(String validString) {
  if (validString == null)
   return false;
  byte[] tempbyte = validString.getBytes();
  for (int i = 0; i < validString.length(); i++) {
   // by=tempbyte[i];
   if ((tempbyte[i] < 48) || (tempbyte[i] > 57)) {
    return false;
   }
  }
  return true;
}

/**
* 判断一个数是否是双精度型数
*
* @param validString
* @return
*/
public static boolean isDouble(String validString) {
  if (validString == null)
   return false;
  int k = 0;
  byte[] tempbyte = validString.getBytes();
  for (int i = 0; i < validString.length(); i++) {
   if (tempbyte[i] == 46) {
    k++;
   }
  }
  if (k > 1)
   return false; // k>1表示有两个以上的小数点,为非法数字
  for (int i = 0; i < validString.length(); i++) {
   if (tempbyte[i] != 46) { // 46为"."的ASCII码
    // ,48为"0"的ASCII码,57是"9"的ASCII码
    if ((tempbyte[i] < 48) || (tempbyte[i] > 57)) {
     return false;
    }
   }
  }
  return true;
}

/**
* 判断字符串是否只包括字母和数字
*
* @param validString
* @return
*/
public static boolean isChar(String validString) {
  if (validString == null)
   return false;
  byte[] tempbyte = validString.getBytes();
  for (int i = 0; i < validString.length(); i++) {
   if ((tempbyte[i] < 48) || ((tempbyte[i] > 57) & (tempbyte[i] < 65)) || (tempbyte[i] > 122)
     || ((tempbyte[i] > 90) & (tempbyte[i] < 97))) {
    return false;
   }
  }
  return true;
}

/**
* 判断字符串是否只包含字母
*
* @param validString
* @return
*/
public static boolean isLetter(String validString) {
  if (validString == null)
   return false;
  byte[] tempbyte = validString.getBytes();
  for (int i = 0; i < validString.length(); i++) {
   if ((tempbyte[i] < 65) || (tempbyte[i] > 122) || ((tempbyte[i] > 90) & (tempbyte[i] < 97))) {
    return false;
   }
  }
  return true;
}

/**
* 字符串替换
*
* @param source
* @param oldString
* @param newString
* @return
*/
public static String Replace(String source, String oldString, String newString) {
  if (source == null)
   return null;
  StringBuffer output = new StringBuffer();
  int lengOfsource = source.length();
  int lengOfold = oldString.length();
  int posStart = 0;
  int pos;
  while ((pos = source.indexOf(oldString, posStart)) >= 0) {
   output.append(source.substring(posStart, pos));
   output.append(newString);
   posStart = pos + lengOfold;
  }
  if (posStart < lengOfsource) {
   output.append(source.substring(posStart));
  }
  return output.toString();
}

/**
* 判断一个字符串是否包含另一个字符串
*
* @param source
* @param findString
* @return
*/
public static boolean isInclude(String source, String findString) {
  if (source == null)
   return false;
  if (findString == null)
   return false;
  int posStart = 0;
  int pos = source.indexOf(findString, posStart);
  boolean jj = false;
  if (pos >= 0) {
   jj = true;
  }
  return jj;
}

/**
* 字符串转换到html语法
*
* @param s
* @return
*/
public static String toHtml(String s) {
  s = Replace(s, "&", "&");
  s = Replace(s, "<", "<");
  s = Replace(s, ">", ">");
  s = Replace(s, "/t", "    ");
  s = Replace(s, "/r/n", "/n");
  // s = Replace(s,"/"","'");
  s = Replace(s, "/n", "<br>");
  s = Replace(s, " ", "  ");
  // s = Replace(s,"","'");
  s = Replace(s, "'", "'");
  s = Replace(s, "//", "\");
  return s;
}

/**
* 相对于上一接口的反转换
*
* @param s
* @return
*/
public static String unHtml(String s) {
  s = Replace(s, "<br>", "/n");
  s = Replace(s, "<", "<");
  s = Replace(s, " ", " ");
  s = Replace(s, ">", ">");
  return s;
}

/**
* 返回一个随机数
*
* @param i
* @return
*/
public static String getRandom(int i) {
  Random jjj = new Random();
  if (i == 0)
   return "";
  String jj = "";
  for (int k = 0; k < i; k++) {
   jj = jj + jjj.nextInt(9);
   ;
  }
  return jj;
}

/***************************************************************************
* 判断是否是时间
**************************************************************************/
public static boolean Isdate(String strdate) {
  if (strdate == null || strdate.equals(""))
   return false;
  if (strdate.length() != 8 && strdate.length() != 10)
   return false;

  String strarray[];
  int intyear = 1990, intmonth = 12, intday = 10;
  strarray = strdate.split("-");

  if (strdate.length() == 10) {
   if (strarray.length != 3) {
    strarray = strdate.split("/");
    if (strarray.length != 3)
     return false;
   }
   intyear = Integer.parseInt(strarray[0]);
   intmonth = Integer.parseInt(strarray[1]);
   intday = Integer.parseInt(strarray[2]);
  }
  if (strdate.length() == 8) {
   intyear = Integer.parseInt(strdate.substring(0, 4));
   intmonth = Integer.parseInt(strdate.substring(4, 6));
   intday = Integer.parseInt(strdate.substring(6, 8));
  }
  if (intyear > 9999 || intyear < 1000) {
   return false;
  }
  if (intmonth > 12 || intmonth < 1) {
   return false;
  }

  if (((intmonth == 1) || (intmonth == 3) || (intmonth == 5) || (intmonth == 7) || (intmonth == 8)
    || (intmonth == 10) || (intmonth == 12))
    && ((intday > 31) || (intday < 1))) {
   return false;
  }

  if ((intmonth == 4 || intmonth == 6 || intmonth == 9 || intmonth == 11) && (intday > 30 || intday < 1)) {
   return false;
  }

  if (intmonth == 2) {
   if (intday < 1) {
    return false;
   }
   boolean boolLeapYear = false;
   if ((intyear % 100) == 0) {
    if ((intyear % 400) == 0)
     boolLeapYear = true;
   } else {
    if ((intyear % 4) == 0)
     boolLeapYear = true;
   }
   if (boolLeapYear) {
    if (intday > 29) {
     return false;
    }
   } else {
    if (intday > 28) {
     return false;
    }
   }
  }
  return true;
}

/**
* url下一个链接符号
*
* @param url
* @return
*/
public static String nextFgf(String url) {
  if (url != null && !"".equals(url)) {
   if (url.indexOf("?") != -1) {
    return "&";
   } else {
    return "?";
   }

}
return "";
}
}