Acegi＋hibernate 动态实现基于角色的权限管理(转)

最近在做项目遇到了权限管理，用户要求可以自己建立不同的角色对系统的资源进行控制， 不同的用户有不同的角色，又恰恰框架中用到了struts＋spring＋hibernate，要求在web层调用 业务逻辑层 时不考虑权限，web层可以控制用户的显示界面，逻辑层处理用户权限问题。
想来想去好像只有spring 的aop 可以做到，在调用到 接口 中的方法时，首先检查用户的权限，如果检查通过则继续执行，否则抛出异常。但是新的问题又出现了，如何在逻辑层上来得到当前用户的id，以致用户的 角色，总不能每次都要从web中传来一个 httprequest，或者 session 这类的吧。在网上看了很多资料，发现了acegi，恰好解决了以上的难题，具体的实现原理这里就不多说了，网上有很多相关资料。
说正题，首先来看看acegi 的官方 example ，我下载的是acegi-security-1.0.0-RC1,解压缩后可以看到acegi-security-sample-contacts-filter.war，打开配置文件有这样几句
java代码:


  <bean id="contactManagerSecurity" class="org.acegisecurity.intercept.method.aopalliance.MethodSecurityInterceptor">
      <property name="authenticationManager"><ref bean="authenticationManager"/></property>
      <property name="accessDecisionManager"><ref local="businessAccessDecisionManager"/></property>
      <property name="afterInvocationManager"><ref local="afterInvocationManager"/></property>
      <property name="objectDefinitionSource">
         <value>
            sample.contact.ContactManager.create=ROLE_USER
            sample.contact.ContactManager.getAllRecipients=ROLE_USER
            sample.contact.ContactManager.getAll=ROLE_USER,AFTER_ACL_COLLECTION_READ
            sample.contact.ContactManager.getById=ROLE_USER,AFTER_ACL_READ
            sample.contact.ContactManager.delete=ACL_CONTACT_DELETE
            sample.contact.ContactManager.deletePermission=ACL_CONTACT_ADMIN
            sample.contact.ContactManager.addPermission=ACL_CONTACT_ADMIN
         </value>
      </property>
   </bean>


可以看到它是通过读配置文件来判断执行某个方法所需要的角色的，再看这几句
java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>
                            CONVERT_URL_TO_LOWERCASE_BEFORE_COMPARISON
                            PATTERN_TYPE_APACHE_ANT
                            /index.jsp=ROLE_ANONYMOUS,ROLE_USER
                            /hello.htm=ROLE_ANONYMOUS,ROLE_USER
                            /logoff.jsp=ROLE_ANONYMOUS,ROLE_USER
                            /switchuser.jsp=ROLE_SUPERVISOR
                            /j_acegi_switch_user=ROLE_SUPERVISOR
                            /acegilogin.jsp*=ROLE_ANONYMOUS,ROLE_USER
                                /**=ROLE_USER
         </value>
      </property>
   </bean>


同样是将页面的访问权限写死在配置文件中，再来看看它的tag是如何处理的
java代码:


<auth:authorize ifAnyGranted="ROLE_DELETE">
          <a href="">删除</a>
</auth:authorize>


可见它是要求我们对链接或者其他资源的保护时提供 用户角色，可是既然角色是用户自己添加的我们又如何来写死在这里呢？
还有就是它对用户验证默认使用的是jdbc,即 JdbcDaoImpl
java代码:


<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
                <property name="dataSource"><ref local="dataSource"/></property>
        </bean>


而我们希望基于Hibernate的Dao来实现。
可见仅仅使用现有的acegi 是 无法满足我们项目开发的需求的。
解决方法:

1: 开发基于数据库的保护资源。

看过acegi的源代码就会知道，对保护资源的定义是通过实现ObjectDefinitionSource这个接口来实现的，而且acegi为我们提供了默认实现的抽象类
java代码:


public abstract class AbstractMethodDefinitionSource
    implements MethodDefinitionSource {
    //~ Static fields/initializers =============================================

    private static final Log logger = LogFactory.getLog(AbstractMethodDefinitionSource.class);

    //~ Methods ================================================================

    public ConfigAttributeDefinition getAttributes(Object object)
        throws IllegalArgumentException {
        Assert.notNull(object, "Object cannot be null");

        if (object instanceof MethodInvocation) {
            return this.lookupAttributes(((MethodInvocation) object).getMethod());
        }

        if (object instanceof JoinPoint) {
            JoinPoint jp = (JoinPoint) object;
            Class targetClazz = jp.getTarget().getClass();
            String targetMethodName = jp.getStaticPart().getSignature().getName();
            Class[] types = ((CodeSignature) jp.getStaticPart().getSignature())
                    .getParameterTypes();

            if (logger.isDebugEnabled()) {
                logger.debug("Target Class: " + targetClazz);
                logger.debug("Target Method Name: " + targetMethodName);

                for (int i = 0; i < types.length; i++) {
                    if (logger.isDebugEnabled()) {
                        logger.debug("Target Method Arg #" + i + ": "
                                + types[i]);
                    }
                }
            }

            try {
                return this.lookupAttributes(targetClazz.getMethod(targetMethodName, types));
            } catch (NoSuchMethodException nsme) {
                throw new IllegalArgumentException("Could not obtain target method from JoinPoint: " + jp);
            }
        }

        throw new IllegalArgumentException("Object must be a MethodInvocation or JoinPoint");
    }

    public boolean supports(Class clazz) {
        return (MethodInvocation.class.isAssignableFrom(clazz)
        || JoinPoint.class.isAssignableFrom(clazz));
    }


    protected abstract ConfigAttributeDefinition lookupAttributes(Method method);
}


我们要做的就是实现它的
protected abstract ConfigAttributeDefinition lookupAttributes(Method method);方法，
以下是我的实现方法，大致思路是这样，通过由抽象类传来的Method 对象得到
调 用这个方法的 包名，类名，方法名 也就是secureObjectName， 查询数据库并将结果映射为Function 也就是secureObject ，由于Function 与 Role 的多对多关系 可以得到 Function所对应的 Roles ，在将role 包装成GrantedAuthority （也就是acegi中的角色）。其中由于频繁的对数据库的查询 所以使用Ehcache 来作为缓存。
java代码:


package sample.auth;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import org.acegisecurity.ConfigAttributeDefinition;
import org.acegisecurity.ConfigAttributeEditor;
import org.acegisecurity.GrantedAuthority;
import org.acegisecurity.GrantedAuthorityImpl;
import org.acegisecurity.intercept.method.AbstractMethodDefinitionSource;
import org.springframework.util.Assert;

import sample.auth.cache.AuthorityBasedFunctionCache;
import sample.auth.cache.info.FunctionByNameCache;
import sample.dao.IBaseDao;
import sample.mappings.function.Function;
import sample.mappings.role.Role;

public class DatabaseDrivenMethodDefinitionSourcew extends
                AbstractMethodDefinitionSource {
       
        // baseDao 提供通过HIbenate对数据库操作的实现
        private IBaseDao baseDao;
        // AuthorityBasedFunctionCache 通过Function 查 Role 时缓存
        private AuthorityBasedFunctionCache cache;
        // FunctionByNameCache 由反射到的方法名查找 数据库对应的Function 时的缓存
        private FunctionByNameCache functionCache;

        public FunctionByNameCache getFunctionCache() {
                return functionCache;
        }

        public void setFunctionCache(FunctionByNameCache functionCache) {
                this.functionCache = functionCache;
        }

        protected ConfigAttributeDefinition lookupAttributes(Method mi) {
       
                Assert.notNull(mi,"lookupAttrubutes in the DatabaseDrivenMethodDefinitionSourcew is null");
                String secureObjectName=mi.getDeclaringClass().getName() +"."+ mi.getName();
                //Function 为数据库中保护资源的映射
                Function secureObject=functionCache.getFunctionByCache(secureObjectName);

                if(secureObject==null)//if secure object not exist in database
                {
                        secureObject=(Function)baseDao.loadByKey(Function.class, "protectfunction", secureObjectName);
                        functionCache.putFunctionInCache(secureObject);
                }
                   
                if(secureObject==null)
                        Assert.notNull(secureObject,"secureObject(Function) not found in db");
                //retrieving roles associated with this secure object
               
                Collection roles = null;
                GrantedAuthority[] grantedAuthoritys = cache.getAuthorityFromCache(secureObject.getName());
                // 如果是第一次 cache 为空
                if(grantedAuthoritys == null){
                       
                        Set rolesSet = secureObject.getRoles();
                        Iterator it = rolesSet.iterator();
                        List list = new ArrayList();
                        while(it.hasNext()){
                               
                                Role role = (Role)it.next();
                                GrantedAuthority g = new  GrantedAuthorityImpl(role.getName());
                                list.add(g);       
                        }
                        grantedAuthoritys = (GrantedAuthority[])list.toArray(new GrantedAuthority[0]);
                        cache.putAuthorityInCache(secureObject.getName(),grantedAuthoritys);
                        roles = Arrays.asList(grantedAuthoritys);
                }else{
                       
                        roles = Arrays.asList(grantedAuthoritys);
                }
               
                if(!roles.isEmpty()){
                        ConfigAttributeEditor configAttrEditor=new ConfigAttributeEditor();
                        StringBuffer rolesStr=new StringBuffer();
                        for(Iterator it = roles.iterator();it.hasNext();){
                                GrantedAuthority role=(GrantedAuthority)it.next();
                                rolesStr.append(role.getAuthority()).append(",");
                        }

                        configAttrEditor.setAsText( rolesStr.toString().substring(0,rolesStr.length()-1) );
                        ConfigAttributeDefinition configAttrDef=(ConfigAttributeDefinition)configAttrEditor.getValue();
                        return configAttrDef;
                }

                Assert.notEmpty(roles,"collection of roles is null or empty");
                return null;
               

        }

        public Iterator getConfigAttributeDefinitions() {
               
                return null;
        }


        public IBaseDao getBaseDao() {
                return baseDao;
        }


        public void setBaseDao(IBaseDao baseDao) {
                this.baseDao = baseDao;
        }

        public AuthorityBasedFunctionCache getCache() {
                return cache;
        }

        public void setCache(AuthorityBasedFunctionCache cache) {
                this.cache = cache;
        }

}



2：定义 基于方法的 自定义标志

通过以上的分析 ， 要想使用acegi 做页面的显示控制仅仅靠角色（Role）是不行的，因为用户可能随时定义出新的角色，所以只能 基于方法（Function）的控制。可是acegi 只是提供了基于 角色的 接口GrantedAuthority ，怎么办?  ，如法炮制。 首先定义出我们自己的GrantedFunction，实现也雷同 GrantedAuthorityImpl
java代码:


package sample.auth;

import java.io.Serializable;
public class GrantedFunctionImpl implements GrantedFunction , Serializable{

    private String function;

    //~ Constructors ===========================================================

    public GrantedFunctionImpl(String function) {
        super();
        this.function = function;
    }

    protected GrantedFunctionImpl() {
        throw new IllegalArgumentException("Cannot use default constructor");
    }

    //~ Methods ================================================================

    public String getFunction() {
        return this.function;
    }

    public boolean equals(Object obj) {
        if (obj instanceof String) {
            return obj.equals(this.function);
        }

        if (obj instanceof GrantedFunction) {
            GrantedFunction attr = (GrantedFunction) obj;

            return this.function.equals(attr.getFunction());
        }

        return false;
    }

    public int hashCode() {
        return this.function.hashCode();
    }

    public String toString() {
        return this.function;
    }

}



以 下是我的标志实现，大致思路是 根据 页面 的传来的 方法名（即 FunctionName）查询出对应的Functions，并且包装成grantedFunctions ，然后根据用户的角色查询出用户对应的Functions ，再取这两个集合的交集，最后再根据这个集合是否为空判断是否显示标志体的内容。
java代码:


package sample.auth;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.Tag;
import javax.servlet.jsp.tagext.TagSupport;

import org.acegisecurity.Authentication;
import org.acegisecurity.GrantedAuthority;
import org.acegisecurity.context.SecurityContextHolder;
import org.springframework.util.StringUtils;
import org.springframework.web.util.ExpressionEvaluationUtils;

import sample.web.action.AppContext;
/**
*
* @author limq
*
*/
public class AuthorizeActionTag extends TagSupport{

            private String ifAllGranted = "";
            private String ifAnyGranted = "";
            private String ifNotGranted = "";
           
            public void setIfAllGranted(String ifAllGranted) throws JspException {
                this.ifAllGranted = ifAllGranted;
            }

            public String getIfAllGranted() {
                return ifAllGranted;
            }

            public void setIfAnyGranted(String ifAnyGranted) throws JspException {
                this.ifAnyGranted = ifAnyGranted;
            }

            public String getIfAnyGranted() {
                return ifAnyGranted;
            }

            public void setIfNotGranted(String ifNotGranted) throws JspException {
                this.ifNotGranted = ifNotGranted;
            }

            public String getIfNotGranted() {
                return ifNotGranted;
            }
           
            public int doStartTag() throws JspException {
                if (((null == ifAllGranted) || "".equals(ifAllGranted))
                    && ((null == ifAnyGranted) || "".equals(ifAnyGranted))
                    && ((null == ifNotGranted) || "".equals(ifNotGranted))) {
                    return Tag.SKIP_BODY;
                }

                final Collection granted = getPrincipalFunctionByAuthorities();

                final String evaledIfNotGranted = ExpressionEvaluationUtils
                    .evaluateString("ifNotGranted", ifNotGranted, pageContext);

                if ((null != evaledIfNotGranted) && !"".equals(evaledIfNotGranted)) {
                    Set grantedCopy = retainAll(granted,
                                    parseSecurityString(evaledIfNotGranted));

                    if (!grantedCopy.isEmpty()) {
                        return Tag.SKIP_BODY;
                    }
                }

                final String evaledIfAllGranted = ExpressionEvaluationUtils
                    .evaluateString("ifAllGranted", ifAllGranted, pageContext);

                if ((null != evaledIfAllGranted) && !"".equals(evaledIfAllGranted)) {
                    if (!granted.containsAll(parseSecurityString(evaledIfAllGranted))) {
                        return Tag.SKIP_BODY;
                    }
                }

                final String evaledIfAnyGranted = ExpressionEvaluationUtils
                    .evaluateString("ifAnyGranted", ifAnyGranted, pageContext);

                if ((null != evaledIfAnyGranted) && !"".equals(evaledIfAnyGranted)) {
                    Set grantedCopy = retainAll(granted,
                                    parseSecurityString(evaledIfAnyGranted));

                    if (grantedCopy.isEmpty()) {
                        return Tag.SKIP_BODY;
                    }
                }

                return Tag.EVAL_BODY_INCLUDE;
            }
    /**
     * 得到用户的Authentication，并且从Authentication中获得 Authorities，进而得到 授予用户的 Function
     * @return
     */
            private Collection getPrincipalFunctionByAuthorities() {
                   
                   
            Authentication currentUser = SecurityContextHolder.getContext()
            .getAuthentication();
                if (null == currentUser) {
                    return Collections.EMPTY_LIST;
                }

                if ((null == currentUser.getAuthorities())
                    || (currentUser.getAuthorities().length < 1)) {
                    return Collections.EMPTY_LIST;
                }
           // currentUser.getAuthorities() 返回的是 GrantedAuthority[]
                List granted = Arrays.asList(currentUser.getAuthorities());
                AuthDao authDao =(AuthDao) AppContext.getInstance().getAppContext().getBean("authDao");
                Collection grantedFunctions = authDao.getFunctionsByRoles(granted);
                return grantedFunctions;
            }

            /**
             * 得到用户功能（Function）的集合，并且验证是否合法
             * @param c Collection 类型
             * @return Set类型
             */
            private Set SecurityObjectToFunctions(Collection c) {
                Set target = new HashSet();

                for (Iterator iterator = c.iterator(); iterator.hasNext();) {
                    GrantedFunction function = (GrantedFunction) iterator.next();

                    if (null == function.getFunction()) {
                        throw new IllegalArgumentException(
                            "Cannot process GrantedFunction objects which return null from getFunction() - attempting to process "
                            + function.toString());
                    }

                    target.add(function.getFunction());
                }

                return target;
            }

            /**
             * 处理页面标志属性 ，用' ，'区分
             */
            private Set parseSecurityString(String functionsString) {
                final Set requiredFunctions = new HashSet();
                final String[] functions = StringUtils
                    .commaDelimitedListToStringArray(functionsString);

                for (int i = 0; i < functions.length; i++) {
                    String authority = functions[i];

                 // Remove the role's whitespace characters without depending on JDK 1.4+
                 // Includes space, tab, new line, carriage return and form feed.
                 String function = StringUtils.replace(authority, " ", "");
                 function = StringUtils.replace(function, "\t", "");
                 function = StringUtils.replace(function, "\r", "");
                 function = StringUtils.replace(function, "\n", "");
                 function = StringUtils.replace(function, "\f", "");

                 requiredFunctions.add(new GrantedFunctionImpl(function));
                }

                return requiredFunctions;
            }
            /**
             * 获得用户所拥有的Function 和 要求的 Function 的交集
             * @param granted 用户已经获得的Function
             * @param required 所需要的Function
             * @return
             */
         
            private Set retainAll(final Collection granted, final Set required) {
                Set grantedFunction = SecurityObjectToFunctions(granted);
                Set requiredFunction = SecurityObjectToFunctions(required);
                // retailAll() 获得 grantedFunction 和 requiredFunction 的交集
                // 即删除 grantedFunction 中  除了 requiredFunction 的项
                grantedFunction.retainAll(requiredFunction);

                return rolesToAuthorities(grantedFunction, granted);
            }

            /**
             *
             * @param grantedFunctions 已经被过滤过的Function           
             * @param granted 未被过滤过的，即用户所拥有的Function
             * @return
             */
            private Set rolesToAuthorities(Set grantedFunctions, Collection granted) {
                Set target = new HashSet();

                for (Iterator iterator = grantedFunctions.iterator(); iterator.hasNext();) {
                    String function = (String) iterator.next();

                    for (Iterator grantedIterator = granted.iterator();
                        grantedIterator.hasNext();) {
                        GrantedFunction grantedFunction = (GrantedFunction) grantedIterator
                            .next();

                        if (grantedFunction.getFunction().equals(function)) {
                            target.add(grantedFunction);

                            break;
                        }
                    }
                }

                return target;
            }
}



再说明一下吧，通过 AppContext 获得了Spring的上下文，以及AuthDao（实际意义上讲以不再是单纯的Dao，应该是Service）
java代码:


package sample.auth;

import java.util.Collection;
public interface  AuthDao {

    /**
     *  根据用户的角色集合 得到 用户的 操作权限
     * @param granted 已授予用户的角色集合
     * @return 操作权限的集合
     */
        public Collection getFunctionsByRoles(Collection granted);
}


以下是AuthDao 的实现
java代码:


package sample.auth;

import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import org.acegisecurity.GrantedAuthority;

import sample.auth.cache.FunctionCache;
import sample.auth.cache.info.RoleByNameCache;
import sample.dao.IBaseDao;
import sample.mappings.function.Function;
import sample.mappings.role.Role;


public class AuthDaoImpl  implements AuthDao {

    private IBaseDao baseDao;
    private FunctionCache cache;
    private RoleByNameCache roleCache;
   
        public RoleByNameCache getRoleCache() {
                return roleCache;
        }

        public void setRoleCache(RoleByNameCache roleCache) {
                this.roleCache = roleCache;
        }

        public FunctionCache getCache() {
                return cache;
        }

        public void setCache(FunctionCache cache) {
                this.cache = cache;
        }

        public IBaseDao getBaseDao() {
        return baseDao;
    }

    public void setBaseDao(IBaseDao baseDao) {
        this.baseDao = baseDao;
    }

 

        public Collection getFunctionsByRoles(Collection granted) {
                Set set = new HashSet();
                if(null == granted) throw new IllegalArgumentException("Granted Roles cannot be null");
       
                for(Iterator it = granted.iterator();it.hasNext();){
           
            GrantedAuthority grantedAuthority = (GrantedAuthority)it.next();
            Role  role = roleCache.getRoleByRoleNameCache(grantedAuthority.getAuthority()); //
            if(role == null){
                    role = (Role)baseDao.loadByKey(Role.class, "name", grantedAuthority.getAuthority());
                    roleCache.putRoleInCache(role);
            }
            GrantedFunction[] grantedFunctions = cache.getFunctionFromCache(role.getName());
           
            if(grantedFunctions == null){
                   
                    Set functions = role.getFunctions();
                            for(Iterator it2 = functions.iterator();it2.hasNext();){       
                    Function function = (Function)it2.next();
                    GrantedFunction grantedFunction = new GrantedFunctionImpl(function.getName());
                                    set.add(  grantedFunction  );
                            }
                 
                            grantedFunctions = (GrantedFunction[]) set.toArray(new GrantedFunction[0]);
                            cache.putFuncitonInCache(role.getName(),grantedFunctions);
            }
           
            for(int i = 0 ; i < grantedFunctions.length; i++){
                    GrantedFunction grantedFunction = grantedFunctions[i];
                    set.add(grantedFunction);
            }
                }
       
                return set;
        }

}



3 基于hibernate的用户验证

acegi 默认的 的 用户验证是 通过UserDetailsService 接口 实现的 也就是说我们只要实现了 它的loadUserByUsername 方法。
java代码:


public UserDetails loadUserByUsername(String username)
        throws UsernameNotFoundException, DataAccessException;


以下是我的实现
java代码:


package sample.auth;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import org.acegisecurity.GrantedAuthority;
import org.acegisecurity.GrantedAuthorityImpl;
import org.acegisecurity.userdetails.User;
import org.acegisecurity.userdetails.UserDetails;
import org.acegisecurity.userdetails.UserDetailsService;
import org.acegisecurity.userdetails.UsernameNotFoundException;
import org.springframework.dao.DataAccessException;

import sample.auth.cache.AuthorityBasedUserCache;
import sample.dao.IBaseDao;
import sample.mappings.role.Role;
import sample.utils.MisUtils;

public class HibernateDaoImpl implements UserDetailsService{

       
        private String rolePrefix = "";
        private boolean usernameBasedPrimaryKey = false;
    private AuthorityBasedUserCache cache;

    private IBaseDao baseDao;

        public String getRolePrefix() {
                return rolePrefix;
        }
       
        public void setRolePrefix(String rolePrefix) {
                this.rolePrefix = rolePrefix;
        }
       
        public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException, DataAccessException {
                UserDetails user = getUsersByUsernameQuery(username);
                if(user == null) return null;
               
                GrantedAuthority[] arrayAuths =getAuthoritiesByUsernameQuery(username);
             if (arrayAuths.length == 0) {
                    throw new UsernameNotFoundException("User has no GrantedAuthority");
                }
             
   return new User(username, user.getPassword(), user.isEnabled(),
                     true, true, true, arrayAuths);
        }

        /**
        * 根据用户名查找用户
        * @param username
        * @return
        * @throws DataAccessException
        */
        public UserDetails getUsersByUsernameQuery(String username)throws DataAccessException {
                        sample.mappings.user.User misUser = (sample.mappings.user.User)baseDao.loadByKey(sample.mappings.user.User.class,"name",username);
                        if(misUser != null)
                        {
                        org.acegisecurity.userdetails.UserDetails user =
                        new User(misUser.getName(),misUser.getPassword(),MisUtils.parseBoolean(misUser.getEnable()),true,true,true,getAuthoritiesByUsernameQuery(username));
                        return user;
                        }else
                        return null;       
                }
       
        /**
          * 根据用户名查找角色
          * @param username
          * @return GrantedAuthority[] 用户角色
          * @throws DataAccessException
          */
        public GrantedAuthority[] getAuthoritiesByUsernameQuery(String username)
                throws DataAccessException {
                sample.mappings.user.User misUser
                = (sample.mappings.user.User)baseDao.loadByKey(sample.mappings.user.User.class,"name",username);

        if(misUser != null){
                GrantedAuthority[] grantedAuthoritys = cache.getAuthorityFromCache(misUser.getName());
       
                if(grantedAuthoritys == null){
               
                        Set roles =     misUser.getRoles();
                        Iterator it = roles.iterator();
               
                        List list = new ArrayList();
                        while(it.hasNext() ){
       
                                GrantedAuthorityImpl gai = new GrantedAuthorityImpl(  ((Role)it.next()).getName()  );
                                list.add(gai);
                                }
                        grantedAuthoritys =(GrantedAuthority[]) list.toArray(new  GrantedAuthority[0]);
                        cache.putAuthorityInCache(misUser.getName(),grantedAuthoritys);
                        return grantedAuthoritys;
               
                }
               return grantedAuthoritys;
        }

                return null;
}

        public IBaseDao getBaseDao() {
                return baseDao;
        }

        public void setBaseDao(IBaseDao baseDao) {
                this.baseDao = baseDao;
        }

        public AuthorityBasedUserCache getCache() {
                return cache;
        }

        public void setCache(AuthorityBasedUserCache cache) {
                this.cache = cache;
        }

}
通过以上对acegi 的 处理，足以满足我们目前在spring下基于RBAC的动态权限管理。同时在对频繁的数据库查询上使用了Ehcache作为缓存，在性能上有了很大的改善。