密码
//必须包含大小写字母、数字和特殊字符String regex = "^(?=.*[A-Z])(?=.*[a-z])(?![0-9]+$)(?![^0-9]+$)(?![a-zA-Z]+$)(?![^a-zA-Z]+$)(?![a-zA-Z0-9]+$)[a-zA-Z0-9\\S]{8,16}$";//必须包含大小写字母、数字和特殊字符任意三种public static final String PW_PATTERN = "(?=.*[0-9])(?=.*[a-zA-Z])(?=.*[^a-zA-Z0-9]).{8,30}";static String regex_number = ".*\\d{1,}.*";// 数字 static String regex_lower = ".*[a-z]{1,}.*";// 小写字母 static String regex_upper = ".*[A-Z]{1,}.*";// 大写字母 // static String regex_char = ".*[~!@#$%^&*\\.?]{1,}.*";// 特殊字符 // static String regex_char = ".*[~!@#%^*.?]{1,}.*";// 特殊字符 static String regex_char = ".*[\\W_]{1,}.*";// 特殊字符
import java.util.Random;public class RandomPassword {public static void main(String[] args) {String password = getRandomPassword(8);System.out.println(password);}//获取验证过的随机密码public static String getRandomPassword(int len) {String result = null;/*if(len >= 6) {for(result = makeRandomPassword(len);len >= 6;result = makeRandomPassword(len)){if (result.matches(".*[a-z]{1,}.*") && result.matches(".*[A-Z]{1,}.*") && result.matches(".*\\d{1,}.*") && result.matches(".*[~!@#$%^&*\\.?]{1,}.*")) {return result;} }}*/while(len>=6){result = makeRandomPassword(len);if (result.matches(".*[a-z]{1,}.*") && result.matches(".*[A-Z]{1,}.*") && result.matches(".*\\d{1,}.*") && result.matches(".*[~!@#$%^&*\\.?]{1,}.*")) {return result;} result = makeRandomPassword(len);}return "长度不得少于6位!";}//随机密码生成public static String makeRandomPassword(int len){char charr[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890~!@#$%^&*.?".toCharArray();//System.out.println("字符数组长度:" + charr.length);//可以看到调用此方法多少次StringBuilder sb = new StringBuilder();Random r = new Random();for (int x = 0; x < len; ++x) {sb.append(charr[r.nextInt(charr.length)]);}return sb.toString();}}
参考链接：随机生成的util
