Spring框架下实现基于组的用户权限管理

public class User {　private int id;　private String name;　private String password;　private Set＜String＞ groups = new HashSet＜String＞();}

＜hibernate-mapping auto-import="true" default-lazy="false"＞　＜class name="net.ideawu.User" table="User"＞　＜cache usage="read-write" /＞　＜id name="id" column="id"＞　　＜generator class="native"/＞　＜/id＞　＜property name="name" column="name"/＞　＜property name="password" column="password"/＞ 　＜set name="groups" table="UserGroup" cascade="save-update" lazy="false"＞ 　　＜key column="user" /＞　　＜element column="`group`" type="string" /＞　＜/set＞　＜/class＞＜/hibernate-mapping＞

import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;import org.springframework.web.util.UrlPathHelper;import org.springframework.util.AntPathMatcher;import org.springframework.util.PathMatcher;...public class AuthorizeInterceptor extends HandlerInterceptorAdapter { 　private UrlPathHelper urlPathHelper = new UrlPathHelper(); 　private PathMatcher pathMatcher = new AntPathMatcher(); 　private Properties groupMappings;　/** * Attach URL paths to group. */ 　public void setGroupMappings(Properties groupMappings) { 　　this.groupMappings = groupMappings;　}　public boolean preHandle(HttpServletRequest request, HttpServletResponse response,Object handler) throws Exception { 　　String url = urlPathHelper.getLookupPathForRequest(request);　　String group = lookupGroup(url);　　// 找出资源所需要的权限, 即组名 　　if(group == null){ 　　　// 所请求的资源不需要保护. 　　　return true; 　　}　　// 如果已经登录, 一个User实例被保存在session中.　　User loginUser = (User)request.getSession().getAttribute("loginUser"); 　　ModelAndView mav = new ModelAndView("system/authorizeError");　　if(loginUser == null){　　　mav.addObject("errorMsg", "你还没有登录!");　　　throw new ModelAndViewDefiningException(mav);　　}else{　　　if(!loginUser.getGroups().contains(group)){ 　　　　mav.addObject("errorMsg", "授权失败! 你不在 ＜b＞" + group + "＜/b＞ 组!");　　　　throw new ModelAndViewDefiningException(mav); 　　　} return true; 　　}　}　/* * 查看 　org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.lookupHandler() 　* Ant模式的最长子串匹配法. 　*/　private String lookupGroup(String url){ 　　String group = groupMappings.getProperty(url); 　　if (group == null) {　　　String bestPathMatch = null;　　　for (Iterator it = this.groupMappings.keySet().iterator();it.hasNext();) {　　　　String registeredPath = (String) it.next();　　　　if (this.pathMatcher.match(registeredPath, url) && (bestPathMatch == null || bestPathMatch.length() ＜= registeredPath.length())) { 　　　　　group = this.groupMappings.getProperty(registeredPath);　　　　　bestPathMatch = registeredPath;　　　　}　　　}　　}　　return group; 　}}

＜bean id="authorizeInterceptor" class="net.ideawu.AuthorizeInterceptor"＞ 　＜property name="groupMappings"＞　　＜value＞　　　＜!-- Attach URL paths to group --＞　　　　/admin/*=admin　　＜/value＞　＜/property＞＜/bean＞＜bean id="simpleUrlHandlerMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"＞ 　＜property name="interceptors"＞ 　　＜list＞ 　　＜ref bean="authorizeInterceptor" /＞ ＜/list＞　＜/property＞　＜property name="mappings"＞ 　　＜value＞　　　/index.do=indexController /browse.do=browseController /admin/removeArticle.do=removeArticleController 　　＜/value＞　＜/property＞＜/bean＞