Generate random codes in Client-Side of GWT

问题

I have created a java gwt application in which I want to verify user's email address from client side, is there any way to generate random 5 character code on client side?

Any sort of help will be appreciated.

回答1:

Why don't you test with Java Math.random() .You can simply get by it.

Here is useful formula for generating random numbers

(int)(Math.random() * (max - min) + min)

So , you can generate 5 random numbers as like...

String randomCodes = String.valueOf((int) (Math.random() * (99999 - 1) + 1));
    while (randomCodes.length() < 5) {
            randomCodes = "0" + randomCodes;
        }

回答2:

Something like this?

StringBuilder sb = new StringBuilder();
Random random = new Random();

for (int i=0;i<5;i++) {
    sb.append('a'+random.nextInt(26));
}
String code = sb.toString();

回答3:

You can use the RandomStringUtils from the Apache Commons project,

RandomStringUtils.randomAlphabetic(5);

来源：https://stackoverflow.com/questions/20837579/generate-random-codes-in-client-side-of-gwt