Java中使用matches函数判断密码强度

浅浅的花香味﹌ 2021-09-21 03:10 393阅读 0赞

# Java中使用matches函数判断密码强度 #

本文是基于Windows 10系统环境，使用Java中使用matches函数判断密码强度

*  **Windows 10**

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## 一、matches函数 ##

*  **java中的matches()进行模式匹配**

### (1) matches使用方法 ###

String str1 = new String("abc");
    boolean flag1 = str1.matches("[a-z]{3}"
    System.out.println(flag1);
    // flag=true 
    String str2 = new String("abc");
    boolean flag2 = str2.matches("[a-z]{4}"
    System.out.println(flag2);
    // flag=false
    String str3 = new String("a2b");
    boolean flag3 = str3.matches("[a-z]{3}"
    System.out.println(flag3);
    // flag=false

## 二、matches应用 ##

### (1) 判断密码强度 ###

public String checkPassword(String password) { 
            String regexWeak1 = "^[0-9A-Za-z]{6,16}$";
            String regexMedium1 = "^(?=.{6,16})[0-9A-Za-z]*[^0-9A-Za-z][0-9A-Za-z]*$";
            String regexMedium2 = "^(?=.{6,16})[0-9A-Za-z]*[\x00-\x2f\x3A-\x40\x5B-\xFF][0-9A-Za-z]*$";
            String regexStrong1 = "^(?=.{6,16})([0-9A-Za-z]*[^0-9A-Za-z][0-9A-Za-z]*){2,}$";
            String regexStrong2 = "^(?=.{6,16})([0-9A-Za-z]*[\x00-\x2F\x3A-\x40\x5B-\xFF][0-9A-Za-z]*){2,}$*/";
    
            if (passwordStr.matches(regexWeak1)) { 
                return "Weak";
            }
            if (passwordStr.matches(regexMedium1)) { 
                return "Medium";
            }
            if (passwordStr.matches(regexMedium2)) { 
                return "Medium";
            }
            if (passwordStr.matches(regexStrong1)) { 
                return "Strong";
            }
            if (passwordStr.matches(regexStrong2)) { 
                return "Strong";
            }
            return passwordStr;
    
        }

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