JAVA 字符處理

/** * 分割字符串 * * @param str String 原始字符串 * @param splitsign String 分隔符 * @return String[] 分割后的字符串數組 */  
@SuppressWarnings("unchecked")  
public static String[] split(String str, String splitsign) {  int index;  if (str == null || splitsign == null)  return null;  ArrayList al = new ArrayList();  while ((index = str.indexOf(splitsign)) != -1) {  al.add(str.substring(0, index));  str = str.substring(index + splitsign.length());  }  al.add(str);  return (String[]) al.toArray(new String[0]);  
}  /** * 替換字符串 * * @param from String 原始字符串 * @param to String 目標字符串 * @param source String 母字符串 * @return String 替換后的字符串 */  
public static String replace(String from, String to, String source) {  if (source == null || from == null || to == null)  return null;  StringBuffer bf = new StringBuffer("");  int index = -1;  while ((index = source.indexOf(from)) != -1) {  bf.append(source.substring(0, index) + to);  source = source.substring(index + from.length());  index = source.indexOf(from);  }  bf.append(source);  return bf.toString();  
}  /** * 替換字符串，能能夠在HTML頁面上直接顯示(替換雙引號和小于號) * * @param str String 原始字符串 * @return String 替換后的字符串 */  
public static String htmlencode(String str) {  if (str == null) {  return null;  }  return replace("\"", """, replace("<", "<", str));  
}  /** * 替換字符串，將被編碼的轉換成原始碼（替換成雙引號和小于號） * * @param str String * @return String */  
public static String htmldecode(String str) {  if (str == null) {  return null;  }  return replace(""", "\"", replace("<", "<", str));  
}  private static final String _BR = "<br/>";  /** * 在頁面上直接顯示文本內容，替換小于號，空格，回車，TAB * * @param str String 原始字符串 * @return String 替換后的字符串 */  
public static String htmlshow(String str) {  if (str == null) {  return null;  }  str = replace("<", "<", str);  str = replace(" ", "?", str);  str = replace("\r\n", _BR, str);  str = replace("\n", _BR, str);  str = replace("\t", "????", str);  return str;  
}  /** * 返回指定字節長度的字符串 * * @param str String 字符串 * @param length int 指定長度 * @return String 返回的字符串 */  
public static String toLength(String str, int length) {  if (str == null) {  return null;  }  if (length <= 0) {  return "";  }  try {  if (str.getBytes("GBK").length <= length) {  return str;  }  } catch (Exception ex) {  }  StringBuffer buff = new StringBuffer();  int index = 0;  char c;  length -= 3;  while (length > 0) {  c = str.charAt(index);  if (c < 128) {  length--;  } else {  length--;  length--;  }  buff.append(c);  index++;  }  buff.append("...");  return buff.toString();  
}  /** * 判斷是否為整數 * * @param str 傳入的字符串 * @return 是整數返回true,否則返回false */  
public static boolean isInteger(String str) {  Pattern pattern = Pattern.compile("^[-\\+]?[\\d]*$");  return pattern.matcher(str).matches();  
}  /** * 判斷是否為浮點數，包括double和float * * @param str 傳入的字符串 * @return 是浮點數返回true,否則返回false */  
public static boolean isDouble(String str) {  Pattern pattern = Pattern.compile("^[-\\+]?[.\\d]*$");  return pattern.matcher(str).matches();  
}  /** * 判斷輸入的字符串是否符合Email樣式. * * @param str 傳入的字符串 * @return 是Email樣式返回true,否則返回false */  
public static boolean isEmail(String str) {  Pattern pattern = Pattern.compile("^\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*$");  return pattern.matcher(str).matches();  
}  /** * 判斷輸入的字符串是否為純漢字 * * @param str 傳入的字符竄 * @return 如果是純漢字返回true,否則返回false */  
public static boolean isChinese(String str) {  Pattern pattern = Pattern.compile("[\u0391-\uFFE5]+$");  return pattern.matcher(str).matches();  
}  /** * 是否為空白,包括null和"" * * @param str * @return */  
public static boolean isBlank(String str) {  return str == null || str.trim().length() == 0;  
}  /** 
* 判斷是不是合法手機 
* handset 手機號碼 
*/  
public static boolean isHandset(String handset) {  
try {  if(!handset.substring(0,1).equals("1")) {  return false;  }  if (handset==null || handset.length()!=11) {  return false;  }  String check = "^[0123456789]+$";  Pattern regex = Pattern.compile(check);  Matcher matcher = regex.matcher(handset);  boolean isMatched = matcher.matches();  if(isMatched) {  return true;  } else {  return false;  }  
} catch (RuntimeException e) {  return false;  
}  
}  
}