从指定的字符串中提取Email

古城微笑少年丶 2022-08-27 12:38 168阅读 0赞

/\*\*  
  \* 从指定的字符串中提取Email  
  \* content 指定的字符串  
  \*/  
 public static String parse(String content) \{  
  String email = null;  
  if (content==null || content.length()<1) \{  
   return email;  
  \}  
  //找出含有@  
  int beginPos;  
  int i;  
  String token = "@";  
  String preHalf="";  
  String sufHalf = "";  
   
  beginPos = content.indexOf(token);  
  if (beginPos>-1) \{  
   //前项扫描  
   String s = null;  
   i= beginPos;  
   while(i>0) \{  
    s = content.substring(i-1,i);  
    if (isLetter(s))  
     preHalf = s+preHalf;  
    else  
     break;  
    i--;  
   \}  
   //后项扫描  
   i= beginPos+1;  
   while( i<content.length()) \{  
    s = content.substring(i,i+1);  
    if (isLetter(s))  
     sufHalf =  sufHalf +s;  
    else  
     break;  
    i++;   
   \}  
   //判断合法性  
   email = preHalf + "@" + sufHalf;  
   if (isEmail(email)) \{  
    return email;  
   \}  
  \}  
  return null;  
 \}  
   
 /\*\*  
  \* 判断是不是合法Email  
  \* email Email地址  
  \*/  
 public static boolean isEmail(String email) \{  
  try \{  
   if (email==null || email.length()<1 || email.length()>256) \{  
    return false;  
   \}  
    
   String check = "^(\[0-9a-zA-Z\]+\[\_.0-9a-zA-Z-\]+)@(\[a-zA-Z0-9-\]+\[.\])+(\[a-zA-Z\]\{2,3\})$";  
   Pattern regex = Pattern.compile(check);  
   Matcher matcher = regex.matcher(email);  
   boolean isMatched = matcher.matches();  
   if(isMatched) \{  
    return true;  
   \} else \{  
    return false;  
   \}  
  \} catch (RuntimeException e) \{  
   return false;  
  \}  
 \}  
   
 /\*\*  
  \* 判断是不是合法字符  
  \* c 要判断的字符  
  \*/  
 public static boolean isLetter(String c) \{  
  boolean result = false;  
   
  if (c==null || c.length()<0) \{  
   return false;  
  \}  
  //a-z  
  if (c.compareToIgnoreCase("a")>=0 && c.compareToIgnoreCase("z")<=0) \{  
   return true;  
  \}  
  //0-9  
  if (c.compareToIgnoreCase("0")>=0 && c.compareToIgnoreCase("9")<=0) \{  
   return true;  
  \}  
  //. - \_  
  if (c.equals(".") || c.equals("-") || c.equals("\_") ) \{  
   return true;  
  \}  
  return result;  
 \}