JAVA 字符处理

/** * 分割字符串 * * @param str String 原始字符串 * @param splitsign String 分隔符 * @return String[] 分割后的字符串数组 */  
@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]);  
}  /** * 替换字符串 * * @param from String 原始字符串 * @param to String 目标字符串 * @param source String 母字符串 * @return String 替换后的字符串 */  
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();  
}  /** * 替换字符串，能能够在HTML页面上直接显示(替换双引号和小于号) * * @param str String 原始字符串 * @return String 替换后的字符串 */  
public static String htmlencode(String str) {  if (str == null) {  return null;  }  return replace("\"", """, replace("<", "<", str));  
}  /** * 替换字符串，将被编码的转换成原始码（替换成双引号和小于号） * * @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/>";  /** * 在页面上直接显示文本内容，替换小于号，空格，回车，TAB * * @param str String 原始字符串 * @return String 替换后的字符串 */  
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;  
}  /** * 返回指定字节长度的字符串 * * @param str String 字符串 * @param length int 指定长度 * @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();  
}  /** * 判断是否为整数 * * @param str 传入的字符串 * @return 是整数返回true,否则返回false */  
public static boolean isInteger(String str) {  Pattern pattern = Pattern.compile("^[-\\+]?[\\d]*$");  return pattern.matcher(str).matches();  
}  /** * 判断是否为浮点数，包括double和float * * @param str 传入的字符串 * @return 是浮点数返回true,否则返回false */  
public static boolean isDouble(String str) {  Pattern pattern = Pattern.compile("^[-\\+]?[.\\d]*$");  return pattern.matcher(str).matches();  
}  /** * 判断输入的字符串是否符合Email样式. * * @param str 传入的字符串 * @return 是Email样式返回true,否则返回false */  
public static boolean isEmail(String str) {  Pattern pattern = Pattern.compile("^\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*$");  return pattern.matcher(str).matches();  
}  /** * 判断输入的字符串是否为纯汉字 * * @param str 传入的字符窜 * @return 如果是纯汉字返回true,否则返回false */  
public static boolean isChinese(String str) {  Pattern pattern = Pattern.compile("[\u0391-\uFFE5]+$");  return pattern.matcher(str).matches();  
}  /** * 是否为空白,包括null和"" * * @param str * @return */  
public static boolean isBlank(String str) {  return str == null || str.trim().length() == 0;  
}  /** 
* 判断是不是合法手机 
* handset 手机号码 
*/  
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;  
}  
}  
}