Spring Security 权限控制

搞了一天的Spring Security，从早折腾到黑。在这把思路整理一下，为需要的朋友做个参考。
主要参考了http://blog.csdn.net/csuliky/archive/2009/06/17/4277413.aspx的文章及Spring官网的例子。
首先配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <context-param>
        <!--让容器找到spring的配置文件-->
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:*.xml</param-value>
    </context-param>
    <filter>  
        <filter-name>springSecurityFilterChain</filter-name>  
        <filter-class>  
            org.springframework.web.filter.DelegatingFilterProxy  
        </filter-class>  
    </filter>  
    <filter-mapping>  
        <filter-name>springSecurityFilterChain</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>  
    
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
    <login-config>  
        <auth-method>BASIC</auth-method>  
    </login-config>  
</web-app>

然后配置security.xml（名称随便起，想叫什么都行），我把它放到source根目录，跟applicationContext.xml放到一起

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/security"
    xmlns:beans="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
                        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
                        http://www.springframework.org/schema/security
                        http://www.springframework.org/schema/security/spring-security-3.0.xsd">

    <global-method-security pre-post-annotations="enabled">
        <!-- AspectJ pointcut expression that locates our "post" method and applies security that way
        <protect-pointcut expression="execution(* bigbank.*Service.post*(..))" access="ROLE_TELLER"/>
        -->
    </global-method-security>

    <http use-expressions="true">
        <intercept-url pattern="/secure/extreme/**" access="hasRole('ROLE_SUPERVISOR')"/>
        <intercept-url pattern="/secure/**" access="isAuthenticated()" />
        <!-- Disable web URI authorization, as we're using <global-method-security> and have @Secured the services layer instead
        <intercept-url pattern="/listAccounts.html" access="isRememberMe()" />
        <intercept-url pattern="/post.html" access="hasRole('ROLE_TELLER')" />
        -->
        <intercept-url pattern="/**" access="permitAll" />
        <form-login />
        <logout />
        <remember-me />
<!--
    Uncomment to enable X509 client authentication support
        <x509 />
-->
        <!-- Uncomment to limit the number of sessions a user can have -->
        <session-management invalid-session-url="/timeout.jsp">
            <concurrency-control max-sessions="1" error-if-maximum-exceeded="true" />
        </session-management>

    </http>

    <!--
    Usernames/Passwords are
        rod/koala
        dianne/emu
        scott/wombat
        peter/opal
    -->
    <authentication-manager>
<!--        <authentication-provider>
            <password-encoder hash="md5"/>
            <user-service>
                <user name="rod" password="a564de63c2d0da68cf47586ee05984d7" authorities="ROLE_SUPERVISOR, ROLE_USER, ROLE_TELLER" />
                <user name="dianne" password="65d15fe9156f9c4bbffd98085992a44e" authorities="ROLE_USER,ROLE_TELLER" />
                <user name="scott" password="2b58af6dddbd072ed27ffc86725d7d3a" authorities="ROLE_USER" />
                <user name="peter" password="22b5c9accc6e1ba628cedc63a72d57f8" authorities="ROLE_USER" />
            </user-service>
        </authentication-provider>-->
        <authentication-provider>
            <password-encoder hash="md5"/>
           <jdbc-user-service data-source-ref="myDataSource" />  
        </authentication-provider>
        
    </authentication-manager>

</beans:beans>

主要的配置文件就是这样了，在页面上也要进行一些设置，就不再一一例举了，把demo传上来，需要的下载开代码就明白了。

这是一个Spring Security的数据库认证实例,要注意以下几点:
（1）请自行加入Spring必须的包,Spring security的包和MySQL的驱动包,当然你也可以换成其他的数据库,但是你要相应的修改spring-common.xml中的dataSource部分
（2）数据库中的两个表users,authorites必须完全按照脚本所示来定义,也就是说表的名字不能修改.
（3）users表必须包含username,password,enabled字段,这三个字段是绝对不能少的,也不能修改类型.另外enabled一定要为1才能登录
（4）authorities表必须包含username字段,这个字段引用users的username作为外键,authority字段就是角色的名字,角色名字必须满足ROLE_XXX的格式(例如:ROLE_ADMIN,ROLE_USER,ROLE_MAMAGER)
（5）如果一个用户有多个角色,不要将多个角色放在一起用逗号隔开.而是每个角色定义一条记录(例如:abu有ROLE_ADMIN,ROLE_USER两个角色,那么应该定义两条记录: 一条为abu, ROLE_USER,另一条为abu, ROLE_ADMIN.而不是只有一条:abu, ROLE_ADMIN,ROLE_USER)
（6）你可以给authorities表添加一个id字段作为主键.

/-- 注意这里的脚本是MYSQL的,因此在你演示这个实例的时候,要加入MySQL的驱动包 --/  
   
create table users  
(  
username varchar(50) primary key,  
password varchar(50),  
enabled tinyint(1)  
);  
  
create table authorities  
(  
id int auto_increment primary key,  
username varchar(50),  
authority varchar(50),  
constraint fk_authorities_users foreign key(username) references users(username)  
);  
  
create unique index ix_auth_username on authorities (username,authority);