最近在做項目遇到了權限管理，用戶要求可以自己建立不同的角色對系統的資源進行控制， 不同的用戶有不同的角色，又恰恰框架中用到了struts＋spring＋hibernate，要求在web層調用 業務邏輯層 時不考慮權限，web層可以控制用戶的顯示界面，邏輯層處理用戶權限問題。
想來想去好像只有spring 的aop 可以做到，在調用到 接口 中的方法時，首先檢查用戶的權限，如果檢查通過則繼續執行，否則拋出異常。但是新的問題又出現了，如何在邏輯層上來得到當前用戶的id，以致用戶的 角色，總不能每次都要從web中傳來一個 httprequest，或者 session 這類的吧。在網上看了很多資料，發現了acegi，恰好解決了以上的難題，具體的實現原理這里就不多說了，網上有很多相關資料。
說正題，首先來看看acegi 的官方 example ，我下載的是acegi-security-1.0.0-RC1,解壓縮后可以看到acegi-security-sample-contacts-filter.war，打開配置文件有這樣幾句
1 <bean id="contactManagerSecurity" class="org.acegisecurity.intercept.method.aopalliance.MethodSecurityInterceptor">
2 <property name="authenticationManager"><ref bean="authenticationManager"/></property>
3 <property name="accessDecisionManager"><ref local="businessAccessDecisionManager"/></property>
4 <property name="afterInvocationManager"><ref local="afterInvocationManager"/></property>
5 <property name="objectDefinitionSource">
6 <value>
7 sample.contact.ContactManager.create=ROLE_USER
8 sample.contact.ContactManager.getAllRecipients=ROLE_USER
9 sample.contact.ContactManager.getAll=ROLE_USER,AFTER_ACL_COLLECTION_READ
10 sample.contact.ContactManager.getById=ROLE_USER,AFTER_ACL_READ
11 sample.contact.ContactManager.delete=ACL_CONTACT_DELETE
12 sample.contact.ContactManager.deletePermission=ACL_CONTACT_ADMIN
13 sample.contact.ContactManager.addPermission=ACL_CONTACT_ADMIN
14 </value>
15 </property>
16 </bean>
17
可以看到它是通過讀配置文件來判斷執行某個方法所需要的角色的，再看這幾句
<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>
同樣是將頁面的訪問權限寫死在配置文件中，再來看看它的tag是如何處理的
<auth:authorize ifAnyGranted="ROLE_DELETE">
<a href="">刪除</a>
</auth:authorize> 可見它是要求我們對鏈接或者其他資源的保護時提供 用戶角色，可是既然角色是用戶自己添加的我們又如何來寫死在這里呢？
還有就是它對用戶驗證默認使用的是jdbc,即 JdbcDaoImpl
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource"><ref local="dataSource"/></property>
</bean> 而我們希望基于Hibernate的Dao來實現。
可見僅僅使用現有的acegi 是 無法滿足我們項目開發的需求的。
解決方法: 1: 開發基于數據庫的保護資源。
看過acegi的源代碼就會知道，對保護資源的定義是通過實現ObjectDefinitionSource這個接口來實現的，而且acegi為我們提供了默認實現的抽象類
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);
}
我們要做的就是實現它的
protected abstract ConfigAttributeDefinition lookupAttributes(Method method);方法，
以下是我的實現方法，大致思路是這樣，通過由抽象類傳來的Method 對象得到
調用這個方法的 包名，類名，方法名 也就是secureObjectName， 查詢數據庫并將結果映射為Function 也就是secureObject ，由于Function 與 Role 的多對多關系 可以得到 Function所對應的 Roles ，在將role 包裝成GrantedAuthority （也就是acegi中的角色）。其中由于頻繁的對數據庫的查詢 所以使用Ehcache 來作為緩存。
1 package sample.auth;
2
3 import java.lang.reflect.Method;
4 import java.util.ArrayList;
5 import java.util.Arrays;
6 import java.util.Collection;
7 import java.util.Iterator;
8 import java.util.List;
9 import java.util.Set;
10
11 import org.acegisecurity.ConfigAttributeDefinition;
12 import org.acegisecurity.ConfigAttributeEditor;
13 import org.acegisecurity.GrantedAuthority;
14 import org.acegisecurity.GrantedAuthorityImpl;
15 import org.acegisecurity.intercept.method.AbstractMethodDefinitionSource;
16 import org.springframework.util.Assert;
17
18 import sample.auth.cache.AuthorityBasedFunctionCache;
19 import sample.auth.cache.info.FunctionByNameCache;
20 import sample.dao.IBaseDao;
21 import sample.mappings.function.Function;
22 import sample.mappings.role.Role;
23
24 public class DatabaseDrivenMethodDefinitionSourcew extends
25 AbstractMethodDefinitionSource {
26
27 // baseDao 提供通過HIbenate對數據庫操作的實現
28 private IBaseDao baseDao;
29 // AuthorityBasedFunctionCache 通過Function 查 Role 時緩存
30 private AuthorityBasedFunctionCache cache;
31 // FunctionByNameCache 由反射到的方法名查找 數據庫對應的Function 時的緩存
32 private FunctionByNameCache functionCache;
33
34 public FunctionByNameCache getFunctionCache() {
35 return functionCache;
36 }
37
38 public void setFunctionCache(FunctionByNameCache functionCache) {
39 this.functionCache = functionCache;
40 }
41
42 protected ConfigAttributeDefinition lookupAttributes(Method mi) {
43
44 Assert.notNull(mi,"lookupAttrubutes in the DatabaseDrivenMethodDefinitionSourcew is null");
45 String secureObjectName=mi.getDeclaringClass().getName() +"."+ mi.getName();
46 //Function 為數據庫中保護資源的映射
47 Function secureObject=functionCache.getFunctionByCache(secureObjectName);
48
49 if(secureObject==null)//if secure object not exist in database
50 {
51 secureObject=(Function)baseDao.loadByKey(Function.class, "protectfunction", secureObjectName);
52 functionCache.putFunctionInCache(secureObject);
53 }
54
55 if(secureObject==null)
56 Assert.notNull(secureObject,"secureObject(Function) not found in db");
57 //retrieving roles associated with this secure object
58
59 Collection roles = null;
60 GrantedAuthority[] grantedAuthoritys = cache.getAuthorityFromCache(secureObject.getName());
61 // 如果是第一次 cache 為空
62 if(grantedAuthoritys == null){
63
64 Set rolesSet = secureObject.getRoles();
65 Iterator it = rolesSet.iterator();
66 List list = new ArrayList();
67 while(it.hasNext()){
68
69 Role role = (Role)it.next();
70 GrantedAuthority g = new GrantedAuthorityImpl(role.getName());
71 list.add(g);
72 }
73 grantedAuthoritys = (GrantedAuthority[])list.toArray(new GrantedAuthority[0]);
74 cache.putAuthorityInCache(secureObject.getName(),grantedAuthoritys);
75 roles = Arrays.asList(grantedAuthoritys);
76 }else{
77
78 roles = Arrays.asList(grantedAuthoritys);
79 }
80
81 if(!roles.isEmpty()){
82 ConfigAttributeEditor configAttrEditor=new ConfigAttributeEditor();
83 StringBuffer rolesStr=new StringBuffer();
84 for(Iterator it = roles.iterator();it.hasNext();){
85 GrantedAuthority role=(GrantedAuthority)it.next();
86 rolesStr.append(role.getAuthority()).append(",");
87 }
88
89 configAttrEditor.setAsText( rolesStr.toString().substring(0,rolesStr.length()-1) );
90 ConfigAttributeDefinition configAttrDef=(ConfigAttributeDefinition)configAttrEditor.getValue();
91 return configAttrDef;
92 }
93
94 Assert.notEmpty(roles,"collection of roles is null or empty");
95 return null;
96
97
98 }
99
100 public Iterator getConfigAttributeDefinitions() {
101
102 return null;
103 }
104
105
106 public IBaseDao getBaseDao() {
107 return baseDao;
108 }
109
110
111 public void setBaseDao(IBaseDao baseDao) {
112 this.baseDao = baseDao;
113 }
114
115 public AuthorityBasedFunctionCache getCache() {
116 return cache;
117 }
118
119 public void setCache(AuthorityBasedFunctionCache cache) {
120 this.cache = cache;
121 }
122
123 }
124
2：定義 基于方法的 自定義標志
通過以上的分析 ， 要想使用acegi 做頁面的顯示控制僅僅靠角色（Role）是不行的，因為用戶可能隨時定義出新的角色，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 ，怎么辦? ，如法炮制。 首先定義出我們自己的GrantedFunction，實現也雷同 GrantedAuthorityImpl
1 package sample.auth;
2
3 import java.io.Serializable;
4 public class GrantedFunctionImpl implements GrantedFunction , Serializable{
5
6 private String function;
7
8 //~ Constructors ===========================================================
9
10 public GrantedFunctionImpl(String function) {
11 super();
12 this.function = function;
13 }
14
15 protected GrantedFunctionImpl() {
16 throw new IllegalArgumentException("Cannot use default constructor");
17 }
18
19 //~ Methods ================================================================
20
21 public String getFunction() {
22 return this.function;
23 }
24
25 public boolean equals(Object obj) {
26 if (obj instanceof String) {
27 return obj.equals(this.function);
28 }
29
30 if (obj instanceof GrantedFunction) {
31 GrantedFunction attr = (GrantedFunction) obj;
32
33 return this.function.equals(attr.getFunction());
34 }
35
36 return false;
37 }
38
39 public int hashCode() {
40 return this.function.hashCode();
41 }
42
43 public String toString() {
44 return this.function;
45 }
46
47 }
48
以下是我的標志實現，大致思路是 根據 頁面 的傳來的 方法名（即 FunctionName）查詢出對應的Functions，并且包裝成grantedFunctions ，然后根據用戶的角色查詢出用戶對應的Functions ，再取這兩個集合的交集，最后再根據這個集合是否為空判斷是否顯示標志體的內容。
1 package sample.auth;
2 import java.util.Arrays;
3 import java.util.Collection;
4 import java.util.Collections;
5 import java.util.HashSet;
6 import java.util.Iterator;
7 import java.util.List;
8 import java.util.Set;
9
10 import javax.servlet.jsp.JspException;
11 import javax.servlet.jsp.tagext.Tag;
12 import javax.servlet.jsp.tagext.TagSupport;
13
14 import org.acegisecurity.Authentication;
15 import org.acegisecurity.GrantedAuthority;
16 import org.acegisecurity.context.SecurityContextHolder;
17 import org.springframework.util.StringUtils;
18 import org.springframework.web.util.ExpressionEvaluationUtils;
19
20 import sample.web.action.AppContext;
21 /**
22 *
23 * @author limq
24 *
25 */
26 public class AuthorizeActionTag extends TagSupport{
27
28 private String ifAllGranted = "";
29 private String ifAnyGranted = "";
30 private String ifNotGranted = "";
31
32 public void setIfAllGranted(String ifAllGranted) throws JspException {
33 this.ifAllGranted = ifAllGranted;
34 }
35
36 public String getIfAllGranted() {
37 return ifAllGranted;
38 }
39
40 public void setIfAnyGranted(String ifAnyGranted) throws JspException {
41 this.ifAnyGranted = ifAnyGranted;
42 }
43
44 public String getIfAnyGranted() {
45 return ifAnyGranted;
46 }
47
48 public void setIfNotGranted(String ifNotGranted) throws JspException {
49 this.ifNotGranted = ifNotGranted;
50 }
51
52 public String getIfNotGranted() {
53 return ifNotGranted;
54 }
55
56 public int doStartTag() throws JspException {
57 if (((null == ifAllGranted) || "".equals(ifAllGranted))
58 && ((null == ifAnyGranted) || "".equals(ifAnyGranted))
59 && ((null == ifNotGranted) || "".equals(ifNotGranted))) {
60 return Tag.SKIP_BODY;
61 }
62
63 final Collection granted = getPrincipalFunctionByAuthorities();
64
65 final String evaledIfNotGranted = ExpressionEvaluationUtils
66 .evaluateString("ifNotGranted", ifNotGranted, pageContext);
67
68 if ((null != evaledIfNotGranted) && !"".equals(evaledIfNotGranted)) {
69 Set grantedCopy = retainAll(granted,
70 parseSecurityString(evaledIfNotGranted));
71
72 if (!grantedCopy.isEmpty()) {
73 return Tag.SKIP_BODY;
74 }
75 }
76
77 final String evaledIfAllGranted = ExpressionEvaluationUtils
78 .evaluateString("ifAllGranted", ifAllGranted, pageContext);
79
80 if ((null != evaledIfAllGranted) && !"".equals(evaledIfAllGranted)) {
81 if (!granted.containsAll(parseSecurityString(evaledIfAllGranted))) {
82 return Tag.SKIP_BODY;
83 }
84 }
85
86 final String evaledIfAnyGranted = ExpressionEvaluationUtils
87 .evaluateString("ifAnyGranted", ifAnyGranted, pageContext);
88
89 if ((null != evaledIfAnyGranted) && !"".equals(evaledIfAnyGranted)) {
90 Set grantedCopy = retainAll(granted,
91 parseSecurityString(evaledIfAnyGranted));
92
93 if (grantedCopy.isEmpty()) {
94 return Tag.SKIP_BODY;
95 }
96 }
97
98 return Tag.EVAL_BODY_INCLUDE;
99 }
100 /**
101 * 得到用戶的Authentication，并且從Authentication中獲得 Authorities，進而得到 授予用戶的 Function
102 * @return
103 */
104 private Collection getPrincipalFunctionByAuthorities() {
105
106
107 Authentication currentUser = SecurityContextHolder.getContext()
108 .getAuthentication();
109 if (null == currentUser) {
110 return Collections.EMPTY_LIST;
111 }
112
113 if ((null == currentUser.getAuthorities())
114 || (currentUser.getAuthorities().length < 1)) {
115 return Collections.EMPTY_LIST;
116 }
117 // currentUser.getAuthorities() 返回的是 GrantedAuthority[]
118 List granted = Arrays.asList(currentUser.getAuthorities());
119 AuthDao authDao =(AuthDao) AppContext.getInstance().getAppContext().getBean("authDao");
120 Collection grantedFunctions = authDao.getFunctionsByRoles(granted);
121 return grantedFunctions;
122 }
123
124 /**
125 * 得到用戶功能（Function）的集合，并且驗證是否合法
126 * @param c Collection 類型
127 * @return Set類型
128 */
129 private Set SecurityObjectToFunctions(Collection c) {
130 Set target = new HashSet();
131
132 for (Iterator iterator = c.iterator(); iterator.hasNext();) {
133 GrantedFunction function = (GrantedFunction) iterator.next();
134
135 if (null == function.getFunction()) {
136 throw new IllegalArgumentException(
137 "Cannot process GrantedFunction objects which return null from getFunction() - attempting to process "
138 + function.toString());
139 }
140
141 target.add(function.getFunction());
142 }
143
144 return target;
145 }
146
147 /**
148 * 處理頁面標志屬性 ，用' ，'區分
149 */
150 private Set parseSecurityString(String functionsString) {
151 final Set requiredFunctions = new HashSet();
152 final String[] functions = StringUtils
153 .commaDelimitedListToStringArray(functionsString);
154
155 for (int i = 0; i < functions.length; i++) {
156 String authority = functions[i];
157
158 // Remove the role's whitespace characters without depending on JDK 1.4+
159 // Includes space, tab, new line, carriage return and form feed.
160 String function = StringUtils.replace(authority, " ", "");
161 function = StringUtils.replace(function, "\t", "");
162 function = StringUtils.replace(function, "\r", "");
163 function = StringUtils.replace(function, "\n", "");
164 function = StringUtils.replace(function, "\f", "");
165
166 requiredFunctions.add(new GrantedFunctionImpl(function));
167 }
168
169 return requiredFunctions;
170 }
171 /**
172 * 獲得用戶所擁有的Function 和 要求的 Function 的交集
173 * @param granted 用戶已經獲得的Function
174 * @param required 所需要的Function
175 * @return
176 */
177
178 private Set retainAll(final Collection granted, final Set required) {
179 Set grantedFunction = SecurityObjectToFunctions(granted);
180 Set requiredFunction = SecurityObjectToFunctions(required);
181 // retailAll() 獲得 grantedFunction 和 requiredFunction 的交集
182 // 即刪除 grantedFunction 中 除了 requiredFunction 的項
183 grantedFunction.retainAll(requiredFunction);
184
185 return rolesToAuthorities(grantedFunction, granted);
186 }
187
188 /**
189 *
190 * @param grantedFunctions 已經被過濾過的Function
191 * @param granted 未被過濾過的，即用戶所擁有的Function
192 * @return
193 */
194 private Set rolesToAuthorities(Set grantedFunctions, Collection granted) {
195 Set target = new HashSet();
196
197 for (Iterator iterator = grantedFunctions.iterator(); iterator.hasNext();) {
198 String function = (String) iterator.next();
199
200 for (Iterator grantedIterator = granted.iterator();
201 grantedIterator.hasNext();) {
202 GrantedFunction grantedFunction = (GrantedFunction) grantedIterator
203 .next();
204
205 if (grantedFunction.getFunction().equals(function)) {
206 target.add(grantedFunction);
207
208 break;
209 }
210 }
211 }
212
213 return target;
214 }
215 }
216
217
再說明一下吧，通過 AppContext 獲得了Spring的上下文，以及AuthDao（實際意義上講以不再是單純的Dao，應該是Service）
package sample.auth;
import java.util.Collection;
public interface AuthDao {
/** *//**
* 根據用戶的角色集合 得到 用戶的 操作權限
* @param granted 已授予用戶的角色集合
* @return 操作權限的集合
*/
public Collection getFunctionsByRoles(Collection granted);
}
以下是AuthDao 的實現
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的用戶驗證
acegi 默認的 的 用戶驗證是 通過UserDetailsService 接口 實現的 也就是說我們只要實現了 它的loadUserByUsername 方法。
1
2 public UserDetails loadUserByUsername(String username)
3 throws UsernameNotFoundException, DataAccessException;
以下是我的實現
1 package sample.auth;
2
3 import java.util.ArrayList;
4 import java.util.Iterator;
5 import java.util.List;
6 import java.util.Set;
7
8 import org.acegisecurity.GrantedAuthority;
9 import org.acegisecurity.GrantedAuthorityImpl;
10 import org.acegisecurity.userdetails.User;
11 import org.acegisecurity.userdetails.UserDetails;
12 import org.acegisecurity.userdetails.UserDetailsService;
13 import org.acegisecurity.userdetails.UsernameNotFoundException;
14 import org.springframework.dao.DataAccessException;
15
16 import sample.auth.cache.AuthorityBasedUserCache;
17 import sample.dao.IBaseDao;
18 import sample.mappings.role.Role;
19 import sample.utils.MisUtils;
20
21 public class HibernateDaoImpl implements UserDetailsService{
22
23
24 private String rolePrefix = "";
25 private boolean usernameBasedPrimaryKey = false;
26 private AuthorityBasedUserCache cache;
27
28 private IBaseDao baseDao;
29
30 public String getRolePrefix() {
31 return rolePrefix;
32 }
33
34 public void setRolePrefix(String rolePrefix) {
35 this.rolePrefix = rolePrefix;
36 }
37
38 public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException, DataAccessException {
39 UserDetails user = getUsersByUsernameQuery(username);
40 if(user == null) return null;
41
42 GrantedAuthority[] arrayAuths =getAuthoritiesByUsernameQuery(username);
43 if (arrayAuths.length == 0) {
44 throw new UsernameNotFoundException("User has no GrantedAuthority");
45 }
46
47 return new User(username, user.getPassword(), user.isEnabled(),
48 true, true, true, arrayAuths);
49 }
50
51 /**
52 * 根據用戶名查找用戶
53 * @param username
54 * @return
55 * @throws DataAccessException
56 */
57 public UserDetails getUsersByUsernameQuery(String username)throws DataAccessException {
58 sample.mappings.user.User misUser = (sample.mappings.user.User)baseDao.loadByKey(sample.mappings.user.User.class,"name",username);
59 if(misUser != null)
60 {
61 org.acegisecurity.userdetails.UserDetails user =
62 new User(misUser.getName(),misUser.getPassword(),MisUtils.parseBoolean(misUser.getEnable()),true,true,true,getAuthoritiesByUsernameQuery(username));
63 return user;
64 }else
65 return null;
66 }
67
68 /**
69 * 根據用戶名查找角色
70 * @param username
71 * @return GrantedAuthority[] 用戶角色
72 * @throws DataAccessException
73 */
74 public GrantedAuthority[] getAuthoritiesByUsernameQuery(String username)
75 throws DataAccessException {
76 sample.mappings.user.User misUser
77 = (sample.mappings.user.User)baseDao.loadByKey(sample.mappings.user.User.class,"name",username);
78
79 if(misUser != null){
80 GrantedAuthority[] grantedAuthoritys = cache.getAuthorityFromCache(misUser.getName());
81
82 if(grantedAuthoritys == null){
83
84 Set roles = misUser.getRoles();
85 Iterator it = roles.iterator();
86
87 List list = new ArrayList();
88 while(it.hasNext() ){
89
90 GrantedAuthorityImpl gai = new GrantedAuthorityImpl( ((Role)it.next()).getName() );
91 list.add(gai);
92 }
93 grantedAuthoritys =(GrantedAuthority[]) list.toArray(new GrantedAuthority[0]);
94 cache.putAuthorityInCache(misUser.getName(),grantedAuthoritys);
95 return grantedAuthoritys;
96
97 }
98 return grantedAuthoritys;
99 }
100
101 return null;
102 }
103
104 public IBaseDao getBaseDao() {
105 return baseDao;
106 }
107
108 public void setBaseDao(IBaseDao baseDao) {
109 this.baseDao = baseDao;
110 }
111
112 public AuthorityBasedUserCache getCache() {
113 return cache;
114 }
115
116 public void setCache(AuthorityBasedUserCache cache) {
117 this.cache = cache;
118 }
119
120 }
121
通過以上對acegi 的 處理，足以滿足我們目前在spring下基于RBAC的動態權限管理。同時在對頻繁的數據庫查詢上使用了Ehcache作為緩存，在性能上有了很大的改善。
代碼 下載：
http://www.tkk7.com/Files/limq/acegi-2.rar 可能不好打開，需要重新開一個IE