生成驗證碼之工具類
package cn.edu.dcxy; import java.util.Random; public class ItUtil { /** * 由於工具類無需創建對象,所以把其構造器私有化 */ private ItUtil(){ } public static String createVerifyCode(int n) { String code = ""; String data = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; Random r = new Random(); for (int i = 0; i < n; i++) { int index = r.nextInt(data.length()); code += data.charAt(index); } return code; } }