SpringSecurity 3.2入门（4）登录密码加密

   <!-- 认证管理器，配置SpringSecutiry的权限信息 -->
    <security:authentication-manager>
        <security:authentication-provider>
            <!-- 帐户信息，指定用户名、密码和权限 -->
            <security:user-service>
                <security:user name="admin" password="21232F297A57A5A743894A0E4A801FC3"
                    authorities="ROLE_ADMIN,ROLE_USER" />
            </security:user-service>

            <!-- 使用md5对密码进行加密 -->
            <security:password-encoder hash="md5" />
            
        </security:authentication-provider>
    </security:authentication-manager>