Java code uses regular validation and common tool methods

1. Regular verification Mailbox

  public static Boolean checkemail (String email) {       Boolean flag = false;       try{        String check = "^ ([a-z0-9a-z]+[-|\\.]?) +[a-z0-9a-z]@ ([a-z0-9a-z]+ (-[a-z0-9a-z]+) \ \.) +[a-za-z]{2,}$ ";        Pattern regex = pattern.compile (check);        Matcher Matcher = regex.matcher (email);        Flag = Matcher.matches ();       } catch (Exception e) {        flag = false;       }       return flag;      }  

2. Verify that the nickname is legal

 　　/** * Verify user name, support Chinese and English (including full-width characters), numbers, underscores and minus signs (full-width and kanji two-bit), 4-20-bit length, English by two-bit count * @return */public static Boolean Validateusername (String userName) {string validatestr = "^[\\w\\--_[0-9]\u4e00-\u9fa5\uff21-\uff3a\uff41-\uf          F5a]+$ ";          Boolean rs = false;          rs = Matcher (Validatestr, userName);              if (RS) {int strlenth = getstrlength (userName);              if (Strlenth < 4 | | Strlenth >) {rs = false;      }} return RS;          }/** * Gets the length of the string, counting the two characters (including Chinese characters) by two bits * @return */public static int Getstrlength (string value) {          int valuelength = 0;          String Chinese = "[\u0391-\uffe5]";              for (int i = 0; i < value.length (); i++) {String temp = value.substring (i, i + 1);              if (Temp.matches (Chinese)) {valuelength + = 2;              } else {valuelength + = 1;  }          }        return valuelength;          } private static Boolean Matcher (String Reg, String string) {Boolean tem = FALSE;          Pattern pattern = Pattern.compile (reg);          Matcher Matcher = Pattern.matcher (string);          TEM = matcher.matches ();      return tem;   }

3. Determine if it is a number

   public static  boolean isinteger (String value) {       Pattern p = pattern.compile ("^[0-9]{11}$");     Matcher m = p.matcher (value);     Boolean IsOK = M.find ();     return IsOK; }

4. Create a random number

public static int Buildrandom (int length) {int num = 1;double random = Math.random (); if (Random < 0.1) {random = random + 0.1;} for (int i = 0; i < length; i++) {num = num * 10;} return (int) ((random * num));

5. Get the model, browser type

  public static  String Gettypeas (httpservletrequest request) {   string typeas= request.getheader ("User-agent" ); if (Typeas.equals ("") | | Typeas==null) {typeas= "nothing";} return typeas; }

5. Get the IP address

  public static  string GetIP (HttpServletRequest request) {   string ip = Request.getheader ("x-forwarded-for");        if (IP = = NULL | | ip.length () = = 0 | | "Unknown". Equalsignorecase (IP)) {            IP = request.getheader ("Proxy-client-ip");        }        if (IP = = NULL | | ip.length () = = 0 | | "Unknown". Equalsignorecase (IP)) {            IP = request.getheader ("Wl-proxy-client-ip");        }        if (IP = = NULL | | ip.length () = = 0 | | "Unknown". Equalsignorecase (IP)) {            IP = request.getremoteaddr ();        }        if (IP = = NULL | | ip.length () = = 0 | | "Unknown". Equalsignorecase (IP)) {ip= "Unknown";}        return IP; }

6. Determine if the number is within the array

public static Boolean isIn (Integer substring, integer[] source) {if (Source = = NULL | | source.length = = 0) {return false;} for (int i = 0; i < source.length; i++) {Integer Asource = source[i];if (asource.equals (substring)) {return true;}} return false;}

Java code uses regular validation and common tool methods