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;
}
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