Java 生成6位随机验证码

一看就懂的东西，赶紧复制使用吧。

public String getRandNum(int charCount) {        String charValue = "";        for (int i = 0; i < charCount; i++) {            char c = (char) (randomInt(0, 10) + '0');            charValue += String.valueOf(c);        }        return charValue;    } public int randomInt(int from, int to) {        Random r = new Random();        return from + r.nextInt(to - from);    }