[原创] JAVA效验EMAIL

public static boolean isEmail ( String email){

String emailChar = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.";

String domainChar = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-";

String domainExt = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

String[] a,b;

String aleft = "",aright = "";

int indexPosition = -1;

indexPosition = email.indexOf("@");

if (indexPosition==-1) return false;

if (indexPosition!=email.lastIndexOf("@")) return false;

if (indexPosition==email.length()-1) return false;

a = StringToStringArray(email,"@");

aleft = a[0];

if (!isInString(aleft,emailChar)) return false;

aright = a[1];

if (aright.indexOf(".")==-1) return false;

if (aright.indexOf(".")==0) return false;

if (aright.lastIndexOf(".")==aright.length()-1) return false;

b = StringToStringArray(aright,".");

for (int i=0;i<b.length;i++){

if (!isInString(b[i],domainChar)) return false;

if (i==b.length-1){

if (!isInString(b[i],domainExt)) return false;

}

}

return true;

}