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Acegi

 
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[简介] 
Acegi Security System 是一种功能强大并易于使用的替代性方案,使您不必再为 Java 企业应用程序编写大量的安全代码。虽然它专门针对使用 Spring 框架编写的应用程序,但是任何类型的 Java 应用程序都没有理由不去使用 Acegi。

本文的主要目的是希望能够说明如何在基于Spring构架的Web应用中使用Acegi,而不是详细介绍其中的每个接口、每个类。注意,即使对已经存在的Spring应用,通过下面介绍的步骤,也可以马上享受到Acegi提供的认证和授权。 


 

Acegi Security System 使用安全过滤器来提供企业应用程序的身份验证和授权服务。该框架提供了不同类型的过滤器,可以根据应用程序的需求进行配置。您将在本文后面了解到 安全过滤器的不同类型 ;现在,只需注意可以为如下任务配置 Acegi 安全过滤器:

在访问一个安全资源之前提示用户登录。


通过检查安全标记(如密码),对用户进行身份验证。


检查经过身份验证的用户是否具有访问某个安全资源的特权。


将成功进行身份验证和授权的用户重定向到所请求的安全资源。


对不具备访问安全资源特权的用户显示 Access Denied 页面。


在服务器上记录成功进行身份验证的用户,并在用户的客户机上设置安全 cookie。使用该 cookie 执行下一次身份验证,而无需要求用户登录。


将身份验证信息存储在服务器端的会话对象中,从而安全地进行对资源的后续请求。


在服务器端对象中构建并保存安全信息的缓存,从而优化性能。


当用户退出时,删除为用户安全会话而保存的服务器端对象。


与大量后端数据存储服务(如目录服务或关系数据库)进行通信,这些服务用于存储用户的安全信息和 ECM 的访问控制策略。 
正如这个列表显示的那样,Acegi 的安全过滤器允许您执行保护企业应用程序所需的几乎任何事情。

 

 

[基础工作] 
在你的Web应用的lib中添加Acegi下载包中的acegi-security.jar 

 

[web.xml] 

在web.xml配置

Xml代码  
<filter>  
        <filter-name>Acegi Filter Chain Proxy</filter-name>  
        <filter-class>  
            org.acegisecurity.util.FilterToBeanProxy   
        </filter-class>  
        <init-param>  
            <param-name>targetClass</param-name>  
            <param-value>  
                org.acegisecurity.util.FilterChainProxy   
            </param-value>  
        </init-param>  
    </filter>  

<filter>
		<filter-name>Acegi Filter Chain Proxy</filter-name>
		<filter-class>
			org.acegisecurity.util.FilterToBeanProxy
		</filter-class>
		<init-param>
			<param-name>targetClass</param-name>
			<param-value>
				org.acegisecurity.util.FilterChainProxy
			</param-value>
		</init-param>
	</filter> 

<filter-mapping>限定了FilterToBeanProxy 的URL匹配模式 ,

Xml代码  
<filter-mapping>  
        <filter-name>Acegi Filter Chain Proxy</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>  

<filter-mapping>
		<filter-name>Acegi Filter Chain Proxy</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping> 

<listener>的HttpSessionEventPublisher 用于发布HttpSessionApplicationEvents 和HttpSessionDestroyedEvent 事件给spring的applicationcontext 。

 

Xml代码  
<listener>  
        <listener-class>  
            org.acegisecurity.ui.session.HttpSessionEventPublisher   
        </listener-class>  
    </listener>  

<listener>
		<listener-class>
			org.acegisecurity.ui.session.HttpSessionEventPublisher
		</listener-class>
	</listener> 

[applicationContext-acegi-security.xml] 

 

 applicationContext-acegi-security.xml文件配置

 

FilterChainProxy 会按顺序来调用这些filter,使这些filter能享用Spring ioc的功能 , CONVERT_URL_TO_LOWERCASE_BEFORE_COMPARISON定义了url比较前先转为小写, PATTERN_TYPE_APACHE_ANT定义了使用Apache ant的匹配模式 

Xml代码  
<bean id="filterChainProxy" class="org.acegisecurity.util.FilterChainProxy">  
     <property name="filterInvocationDefinitionSource">  
        <value>  
        CONVERT_URL_TO_LOWERCASE_BEFORE_COMPARISON   
        PATTERN_TYPE_APACHE_ANT   
           /**=httpSessionContextIntegrationFilter, logoutFilter, authenticationProcessingFilter,   
              basicProcessingFilter,rememberMeProcessingFilter,anonymousProcessingFilter,   
            switchUserProcessingFilter,exceptionTranslationFilter,filterInvocationInterceptor   
        </value>  
     </property>  
   </bean>  

	<bean id="filterChainProxy" class="org.acegisecurity.util.FilterChainProxy">
      <property name="filterInvocationDefinitionSource">
         <value>
		    CONVERT_URL_TO_LOWERCASE_BEFORE_COMPARISON
		    PATTERN_TYPE_APACHE_ANT
            /**=httpSessionContextIntegrationFilter, logoutFilter, authenticationProcessingFilter,
               basicProcessingFilter,rememberMeProcessingFilter,anonymousProcessingFilter,
             switchUserProcessingFilter,exceptionTranslationFilter,filterInvocationInterceptor
         </value>
      </property>
    </bean> 

定义数据源为调用tomcat容器数据源 登入验证时需要获取数据源连接数据库

Xml代码  
<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">  
    <property name="jndiName"><value>java:/comp/env/jdbc/test</value></property>  
</bean>  

    <bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
        <property name="jndiName"><value>java:/comp/env/jdbc/test</value></property>
    </bean> 

认证管理 ,从数据库中读取用户信息验证身份

Xml代码  
<bean id="authenticationManager" class="org.acegisecurity.providers.ProviderManager">  
   <property name="providers">  
      <list>  
         <ref local="daoAuthenticationProvider"/>  
      </list>  
   </property>  
</bean>  

   <bean id="authenticationManager" class="org.acegisecurity.providers.ProviderManager">
      <property name="providers">
         <list>
            <ref local="daoAuthenticationProvider"/>
         </list>
      </property>
   </bean> 

 

 

 

daoAuthenticationProvider 
  进行简单的基于数据库的身份验证。DaoAuthenticationProvider 获取数据库中的账号密码并进行匹配,若成功则在通过用户身份的同时返回一个包含授权信息的Authentication对象 ,否则身份验证失败,抛出一个AuthenticatiionException 。 

Xml代码  
 <bean id="daoAuthenticationProvider" class="org.acegisecurity.providers.dao.DaoAuthenticationProvider">  
      <property name="userDetailsService"><ref local="jdbcDaoImpl"/></property>  
      <property name="passwordEncoder"><ref local="passwordEncoder"/></property>  
      <property name="userCache"><ref local="userCache"/></property>  
 </bean>  

 <bean id="daoAuthenticationProvider" class="org.acegisecurity.providers.dao.DaoAuthenticationProvider">
      <property name="userDetailsService"><ref local="jdbcDaoImpl"/></property>
      <property name="passwordEncoder"><ref local="passwordEncoder"/></property>
      <property name="userCache"><ref local="userCache"/></property>
 </bean> 

jdbcDaoImpl 

用于在数据中获取用户信息

Xml代码  
<bean id="jdbcDaoImpl" class="com.milesup.acegi.userdetails.jdbc.JdbcDaoImpl">  
      <property name="dataSource"><ref bean="dataSource"/></property>  
      <property name="rolePrefix"><value>ROLE_</value></property>  
   </bean>  

<bean id="jdbcDaoImpl" class="com.milesup.acegi.userdetails.jdbc.JdbcDaoImpl">
      <property name="dataSource"><ref bean="dataSource"/></property>
      <property name="rolePrefix"><value>ROLE_</value></property>
   </bean> 

passwordEncoder 

  使用加密器对用户输入的明文进行加密。Acegi提供了三种加密器:


Xml代码  
1 :   PlaintextPasswordEncoder—默认,不加密,返回明文.   
2 :   ShaPasswordEncoder—哈希算法(SHA)加密   
3 :   Md5PasswordEncoder—消息摘要(MD5)加密  

1 :   PlaintextPasswordEncoder—默认,不加密,返回明文.
2 :   ShaPasswordEncoder—哈希算法(SHA)加密
3 :   Md5PasswordEncoder—消息摘要(MD5)加密  
使用加密器对用户输入的明文进行加密 为MD5加密方式

Xml代码  
<bean id="passwordEncoder" class="org.acegisecurity.providers.encoding.Md5PasswordEncoder"/>  

<bean id="passwordEncoder" class="org.acegisecurity.providers.encoding.Md5PasswordEncoder"/>  

缓存用户和资源相对应的权限信息。每当请求一个受保护资源时,daoAuthenticationProvider 就会被调用以获取用户授权信息 。如果每次都从数据库获取的话,那代价很高,对于不常改变的用户和资源信息来说,最好是把相关授权信息缓存起来。
userCache提供了两种实现: NullUserCache 和EhCacheBasedUserCache , NullUserCache 实际上就是不进行任何缓存,EhCacheBasedUserCache 是使用Ehcache来实现缓功能。

Xml代码  
<!-- 缓存管理 -->  
   <bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"/>  
    <!-- 缓存用户和资源相对应的权限信息 -->  
   <bean id="userCacheBackend" class="org.springframework.cache.ehcache.EhCacheFactoryBean">  
      <property name="cacheManager">  
         <ref local="cacheManager"/>  
      </property>  
      <property name="cacheName">  
         <value>userCache</value>  
      </property>  
   </bean>  
      
   <bean id="userCache" class="org.acegisecurity.providers.dao.cache.EhCacheBasedUserCache">  
      <property name="cache"><ref local="userCacheBackend"/></property>  
   </bean>  

<!-- 缓存管理 -->
   <bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"/>
    <!-- 缓存用户和资源相对应的权限信息 -->
   <bean id="userCacheBackend" class="org.springframework.cache.ehcache.EhCacheFactoryBean">
      <property name="cacheManager">
         <ref local="cacheManager"/>
      </property>
      <property name="cacheName">
         <value>userCache</value>
      </property>
   </bean>
   
   <bean id="userCache" class="org.acegisecurity.providers.dao.cache.EhCacheBasedUserCache">
      <property name="cache"><ref local="userCacheBackend"/></property>
   </bean> 

该过滤器用来处理在系统认证授权过程中抛出的异常

Xml代码  
<bean id="exceptionTranslationFilter" class="org.acegisecurity.ui.ExceptionTranslationFilter">  
     <property name="authenticationEntryPoint"><ref local="authenticationProcessingFilterEntryPoint"/></property>  
  </bean>  

 <bean id="exceptionTranslationFilter" class="org.acegisecurity.ui.ExceptionTranslationFilter">
      <property name="authenticationEntryPoint"><ref local="authenticationProcessingFilterEntryPoint"/></property>
   </bean> 

 

一个没有进行身份验证的用户试图访问受保护的资源验证是否授权  Exception Translation Filter(ETF)

Xml代码  
<bean id="authenticationProcessingFilterEntryPoint" class="org.acegisecurity.ui.webapp.AuthenticationProcessingFilterEntryPoint">  
      <property name="loginFormUrl"><value>/login.jsp</value></property>  
      <property name="forceHttps"><value>false</value></property>  
   </bean>  

<bean id="authenticationProcessingFilterEntryPoint" class="org.acegisecurity.ui.webapp.AuthenticationProcessingFilterEntryPoint">
      <property name="loginFormUrl"><value>/login.jsp</value></property>
      <property name="forceHttps"><value>false</value></property>
   </bean> 

登入验证

成功进入main.jsp页面  ,失败跳转到/login.jsp?login_error=1  ,登入url为 /j_acegi_security_check, Authentication Processing Filter(APF)

        authenticationFailureUrl 定义登陆失败时转向的页面
         defaultTargetUrl 定义登陆成功时转向的页面
         filterProcessesUrl 定义登陆请求的页面
         rememberMeServices 用于在验证成功后添加cookie信息

Xml代码  
<bean id="authenticationProcessingFilter" class="org.acegisecurity.ui.webapp.AuthenticationProcessingFilter">  
      <property name="authenticationManager"><ref bean="authenticationManager"/></property>  
      <property name="authenticationFailureUrl"><value>/login.jsp?login_error=1</value></property>  
      <property name="defaultTargetUrl"><value>/main.jsp</value></property>  
      <property name="filterProcessesUrl"><value>/j_acegi_security_check</value></property>  
     <property name="rememberMeServices"><ref local="rememberMeServices"/></property>  
 </bean>  

<bean id="authenticationProcessingFilter" class="org.acegisecurity.ui.webapp.AuthenticationProcessingFilter">
      <property name="authenticationManager"><ref bean="authenticationManager"/></property>
      <property name="authenticationFailureUrl"><value>/login.jsp?login_error=1</value></property>
      <property name="defaultTargetUrl"><value>/main.jsp</value></property>
      <property name="filterProcessesUrl"><value>/j_acegi_security_check</value></property>
     <property name="rememberMeServices"><ref local="rememberMeServices"/></property>
 </bean> 

 

Xml代码  
用于处理HTTP头的认证信息,如从<SPAN style="COLOR: #0000ff"><STRONG>Spring远程协议</STRONG>  
</SPAN>  
(如Hessian和Burlap)或<SPAN style="COLOR: #0000ff"><STRONG>普通的浏览器如IE,Navigator的HTTP头</STRONG>  
</SPAN>  
中获取用户   
信息,将他们转交给通过<SPAN style="TEXT-DECORATION: underline">authenticationManager</SPAN>  
属性装配的认证管理器。如果认证成功,会<SPAN style="TEXT-DECORATION: underline">将一个Authentication对象放到会话中</SPAN>  
  
,否则,如果认证失败,会将控制<SPAN style="TEXT-DECORATION: underline">转交给认证入口点</SPAN>  
(通过authenticationEntryPoint属性装配)   
<!-- 用于处理HTTP头的认证信息 -->  
   <bean id="basicProcessingFilter" class="org.acegisecurity.ui.basicauth.BasicProcessingFilter">  
      <property name="authenticationManager"><ref local="authenticationManager"/></property>  
      <property name="authenticationEntryPoint"><ref local="basicProcessingFilterEntryPoint"/></property>  
   </bean>  
      
   <!-- 通过向浏览器发送一个HTTP401(未授权)消息,提示用户登录 -->  
   <bean id="basicProcessingFilterEntryPoint" class="org.acegisecurity.ui.basicauth.BasicProcessingFilterEntryPoint">  
      <property name="realmName"><value>Milesup Realm</value></property>  
   </bean>  

用于处理HTTP头的认证信息,如从Spring远程协议

(如Hessian和Burlap)或普通的浏览器如IE,Navigator的HTTP头

中获取用户
信息,将他们转交给通过authenticationManager
属性装配的认证管理器。如果认证成功,会将一个Authentication对象放到会话中

,否则,如果认证失败,会将控制转交给认证入口点
(通过authenticationEntryPoint属性装配)
<!-- 用于处理HTTP头的认证信息 -->
   <bean id="basicProcessingFilter" class="org.acegisecurity.ui.basicauth.BasicProcessingFilter">
      <property name="authenticationManager"><ref local="authenticationManager"/></property>
      <property name="authenticationEntryPoint"><ref local="basicProcessingFilterEntryPoint"/></property>
   </bean>
   
   <!-- 通过向浏览器发送一个HTTP401(未授权)消息,提示用户登录 -->
   <bean id="basicProcessingFilterEntryPoint" class="org.acegisecurity.ui.basicauth.BasicProcessingFilterEntryPoint">
      <property name="realmName"><value>Milesup Realm</value></property>
   </bean>  
注销 退出验证 跳转到/login.jsp

Xml代码  
<bean id="logoutFilter" class="org.acegisecurity.ui.logout.LogoutFilter">  
      <constructor-arg value="/login.jsp"/><constructor-arg>  
         <list>  
              <bean class="org.acegisecurity.ui.logout.SecurityContextLogoutHandler"/>  
         </list>  
      </constructor-arg>  
   </bean>  

<bean id="logoutFilter" class="org.acegisecurity.ui.logout.LogoutFilter">
      <constructor-arg value="/login.jsp"/><constructor-arg>
         <list>
              <bean class="org.acegisecurity.ui.logout.SecurityContextLogoutHandler"/>
         </list>
      </constructor-arg>
   </bean> 

经过投票 机制来决定是否可以访问某一资源(URL 或方法 )。allowIfAllAbstainDecisions为false时如果有一个或以上的decisionVoters投票通过,则授权通过。可选的决策机制有ConsensusBased和UnanimousBased

 

roleVoter 
  必须是以rolePrefix设定的value开头的权限才能进行投票,如 ROLE_

Xml代码  
<bean id="roleVoter" class="org.acegisecurity.vote.RoleVoter">  
      <property name="rolePrefix">  
         <value>ROLE_</value>  
      </property>  
   </bean>  
  
  <!-- 组件管理授权过程  决策管理器-->  
   <bean id="httpRequestAccessDecisionManager" class="org.acegisecurity.vote.AffirmativeBased">  
      <property name="allowIfAllAbstainDecisions"><value>false</value></property>  
      <property name="decisionVoters">  
         <list>  
            <ref bean="roleVoter"/>  
         </list>  
      </property>  
   </bean>  

<bean id="roleVoter" class="org.acegisecurity.vote.RoleVoter">
      <property name="rolePrefix">
         <value>ROLE_</value>
      </property>
   </bean>

  <!-- 组件管理授权过程  决策管理器-->
   <bean id="httpRequestAccessDecisionManager" class="org.acegisecurity.vote.AffirmativeBased">
      <property name="allowIfAllAbstainDecisions"><value>false</value></property>
      <property name="decisionVoters">
         <list>
            <ref bean="roleVoter"/>
         </list>
      </property>
   </bean>  
 

过滤器安全拦截器  是否认证,是否有权限访问受保护的资源

 在执行转向url前检查objectDefinitionSource 中设定的用户权限信息。首先,objectDefinitionSource 中定义了访问URL需要的属性信息(这里的属性信息仅仅是标志,告诉accessDecisionManager 要用哪些voter来投票)。然后,authenticationManager 掉用自己的provider来对用户的认证信息进行校验。最后,有投票者根据用户持有认证和访问url需要的属性,调用自己的voter来投票,决定是否允许访问。

Xml代码  
<bean id="filterInvocationInterceptor" class="org.acegisecurity.intercept.web.FilterSecurityInterceptor">  
      <property name="authenticationManager"><ref bean="authenticationManager"/></property>  
      <property name="accessDecisionManager"><ref local="httpRequestAccessDecisionManager"/></property>  
      <property name="objectDefinitionSource">  
         <value>  
            PATTERN_TYPE_APACHE_ANT   
            /user.jsp=ROLE_ADMIN  
            /admin=ROLE_ADMIN  
         </value>  
      </property>  
   </bean>  

<bean id="filterInvocationInterceptor" class="org.acegisecurity.intercept.web.FilterSecurityInterceptor">
      <property name="authenticationManager"><ref bean="authenticationManager"/></property>
      <property name="accessDecisionManager"><ref local="httpRequestAccessDecisionManager"/></property>
      <property name="objectDefinitionSource">
         <value>
			PATTERN_TYPE_APACHE_ANT
			/user.jsp=ROLE_ADMIN
			/admin=ROLE_ADMIN
         </value>
      </property>
   </bean>  
 

[login.jsp] 

 

Html代码  
<form action="/j_acegi_security_check" method="post" >  
    <table>  
                  <tr>  
                    <td width="140" height="22" align="right">用户名</td>  
                    <td width="47%" align="left"><input value="${lastUserName}" name="j_username" type="text" class="inputstyle" id="j_username"></td>  
                    <td align="left" nowrap><div class="loginmeon"> </div></td>  
                  </tr>  
                  <tr>  
                    <td width="140" height="22" align="right">密 码</td>  
                    <td width="47%" align="left"><input name="j_password" type="password" class="inputstyle" id="j_password" size="21"></td>  
                  </tr>  
 <tr>  
                    <td height="60" colspan="3" align="center" valign="middle">  
                 <input type="submit" name="imageField2" value="登入"></td>  
                  </tr>  
                </table>  
                </td>  
              </tr>  
           </table>  
         </td>  
      </tr>  
    </table>  
 </form>     

<form action="/j_acegi_security_check" method="post" >
    <table>
                  <tr>
                    <td width="140" height="22" align="right">用户名</td>
                    <td width="47%" align="left"><input value="${lastUserName}" name="j_username" type="text" class="inputstyle" id="j_username"></td>
                    <td align="left" nowrap><div class="loginmeon"> </div></td>
                  </tr>
                  <tr>
                    <td width="140" height="22" align="right">密 码</td>
                    <td width="47%" align="left"><input name="j_password" type="password" class="inputstyle" id="j_password" size="21"></td>
                  </tr>
 <tr>
                    <td height="60" colspan="3" align="center" valign="middle">
                 <input type="submit" name="imageField2" value="登入"></td>
                  </tr>
                </table>
                </td>
              </tr>
           </table>
         </td>
      </tr>
    </table>
 </form>     
[JdbcDaoImpl.java] 

 

Java代码  
public class JdbcDaoImpl extends org.acegisecurity.userdetails.jdbc.JdbcDaoImpl {   
  
    private String anonymousRoleName = "ROLE_ANONYMOUS";   
  
    private Log logger = LogFactory.getLog(JdbcDaoImpl.class);   
  
    private PreparedStatement userPstmt;   
  
    private PreparedStatement rolePstmt;   
  
    public UserDetails loadUserByUsername(String userName)   
            throws UsernameNotFoundException, DataAccessException {   
        UserDetails user = findUserByName(userName);   
  
        if (user == null) {   
            throw new UsernameNotFoundException("User not found");   
        }   
  
        return user;   
    }   
  
    private UserDetails findUserByName(String userName) {   
        Connection connection = null;   
        ResultSet rsUser = null;   
        ResultSet rsRole = null;   
        UserDetails user = null;   
        String logonName = null;   
        String password = null;   
        String roleName = null;   
        int status = -1;   
        boolean enabled = false;   
        Vector roles = null;   
        GrantedAuthority[] rolesArray = null;   
  
        try {   
            connection = getDataSource().getConnection();   
            userPstmt = connection   
                    .prepareStatement("select * from users where user_NAME=?");   
            userPstmt.setString(1, userName);   
            rsUser = userPstmt.executeQuery();   
            if (rsUser.next()) {   
                logonName = rsUser.getString("USER_NAME");   
                password = rsUser.getString("PASSWORD");   
                status = rsUser.getInt("STATUS");   
                if (status == 1)   
                    enabled = true;   
            } else {   
                return null;   
            }   
            rolePstmt = connection   
                    .prepareStatement("SELECT ROLE.NAME Role FROM ROLE,  users_ROLES,  users WHERE ROLE.ID= user_ROLES.FK_ROLES  and users.user_NAME=?");   
            rolePstmt.setString(1, userName);   
            rsRole = rolePstmt.executeQuery();   
            roles = new Vector();   
            while (rsRole.next()) {   
                roleName = getRolePrefix() + rsRole.getString("Role");   
                roles.add(new GrantedAuthorityImpl(roleName));   
            }   
            rolesArray = new GrantedAuthority[roles.size() + 1];   
            int index = 0;   
            for (index = 0; index < roles.size(); index++)   
                rolesArray[index] = (GrantedAuthority) roles.get(index);   
            rolesArray[index] = new GrantedAuthorityImpl(anonymousRoleName);   
            user = new User(logonName, password, enabled, true, true, true,   
                    rolesArray);   
        } catch (SQLException e) {   
            logger.fatal("", e);   
        } finally {   
            try {   
                rsRole.close();   
                rsUser.close();   
                userPstmt.close();   
                rolePstmt.close();   
                connection.close();   
            } catch (SQLException sqlx) {   
                logger.fatal("", sqlx);   
            } catch (NullPointerException x) {   
                logger.fatal("", x);   
            }   
        }   
        return user;   
    }   
  
}  

public class JdbcDaoImpl extends org.acegisecurity.userdetails.jdbc.JdbcDaoImpl {

	private String anonymousRoleName = "ROLE_ANONYMOUS";

	private Log logger = LogFactory.getLog(JdbcDaoImpl.class);

	private PreparedStatement userPstmt;

	private PreparedStatement rolePstmt;

	public UserDetails loadUserByUsername(String userName)
			throws UsernameNotFoundException, DataAccessException {
		UserDetails user = findUserByName(userName);

		if (user == null) {
			throw new UsernameNotFoundException("User not found");
		}

		return user;
	}

	private UserDetails findUserByName(String userName) {
		Connection connection = null;
		ResultSet rsUser = null;
		ResultSet rsRole = null;
		UserDetails user = null;
		String logonName = null;
		String password = null;
		String roleName = null;
		int status = -1;
		boolean enabled = false;
		Vector roles = null;
		GrantedAuthority[] rolesArray = null;

		try {
			connection = getDataSource().getConnection();
			userPstmt = connection
					.prepareStatement("select * from users where user_NAME=?");
			userPstmt.setString(1, userName);
			rsUser = userPstmt.executeQuery();
			if (rsUser.next()) {
				logonName = rsUser.getString("USER_NAME");
				password = rsUser.getString("PASSWORD");
				status = rsUser.getInt("STATUS");
				if (status == 1)
					enabled = true;
			} else {
				return null;
			}
			rolePstmt = connection
					.prepareStatement("SELECT ROLE.NAME Role FROM ROLE,  users_ROLES,  users WHERE ROLE.ID= user_ROLES.FK_ROLES  and users.user_NAME=?");
			rolePstmt.setString(1, userName);
			rsRole = rolePstmt.executeQuery();
			roles = new Vector();
			while (rsRole.next()) {
				roleName = getRolePrefix() + rsRole.getString("Role");
				roles.add(new GrantedAuthorityImpl(roleName));
			}
			rolesArray = new GrantedAuthority[roles.size() + 1];
			int index = 0;
			for (index = 0; index < roles.size(); index++)
				rolesArray[index] = (GrantedAuthority) roles.get(index);
			rolesArray[index] = new GrantedAuthorityImpl(anonymousRoleName);
			user = new User(logonName, password, enabled, true, true, true,
					rolesArray);
		} catch (SQLException e) {
			logger.fatal("", e);
		} finally {
			try {
				rsRole.close();
				rsUser.close();
				userPstmt.close();
				rolePstmt.close();
				connection.close();
			} catch (SQLException sqlx) {
				logger.fatal("", sqlx);
			} catch (NullPointerException x) {
				logger.fatal("", x);
			}
		}
		return user;
	}

}  

 

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