第四章：密码加密

/**
     * 安全管理器
     * @return
     */
    @Bean
    public SecurityManager securityManager(){
        DefaultWebSecurityManager defaultWebSecurityManager = new DefaultWebSecurityManager();
        //设置realm
        defaultWebSecurityManager.setRealm(myShiroRealm());
        //返回DefaultWebSecurityManager
        return defaultWebSecurityManager;
    }

/**
     * 自定义Realm
     * @return
     */
    @Bean
    public MyShiroRealm myShiroRealm(){
        MyShiroRealm myShiroRealm = new MyShiroRealm();
        myShiroRealm.setCredentialsMatcher(hashedCredentialsMatcher());
        return myShiroRealm;
    }

@Bean
    public HashedCredentialsMatcher hashedCredentialsMatcher(){
        HashedCredentialsMatcher hashedCredentialsMatcher = new HashedCredentialsMatcher();
        hashedCredentialsMatcher.setHashAlgorithmName("md5");//散列算法:这里使用MD5算法;
        hashedCredentialsMatcher.setHashIterations(2);//散列的次数，比如散列两次，相当于 md5(md5(""));
        return hashedCredentialsMatcher;
    }