1.BCryptPasswordEncoder使用之前要加入依賴

如果是SSM加入的依賴

	<dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-config</artifactId>
        <version>5.1.4.RELEASE</version>
     </dependency>

如果是SpringBoot加入的依賴

  <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring‐boot‐starter‐security</artifactId>
    </dependency>

BCryptPasswordEncoder bcryptPasswordEncoder = new BCryptPasswordEncoder();
加密:
bcryptPasswordEncoder.encode(password);

//password是輸入的密碼，encodedPassword是通過bcryptPasswordEncoder進行加密的密碼
解密:
bcrytPasswordEncoder.matches(password,encodedPassword)

測試：

package com.qingfeng.service.impl;

import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;

public class Test {

    public static void main(String[] args) {
        
        String password = "123456";
        BCryptPasswordEncoder bcryptPasswordEncoder = new BCryptPasswordEncoder();

        //加密：bcryptPasswordEncoder進行密碼加密
        String encodedPassword = bcryptPasswordEncoder.encode(password);
        System.out.println("bcryptPasswordEncoder進行密碼加密:"+encodedPassword);

        //解密：
        boolean flag = bcryptPasswordEncoder.matches(password, encodedPassword);
        //如果flag為true，則解密成功  false，則解密失敗
        System.out.println("解密："+flag);

    }

}

測試結果：

bcryptPasswordEncoder進行密碼加密:$2a$10$z1l7KwMFGthgsNOg6h0I4OVTUUyhC11paX1PN8glw7bT3tL4feZ1u

解密：true