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| public class User { private int id; private String name; private String password; private Set＜String＞ groups = new HashSet＜String＞(); } |
UserGroup表:
user:intgroup:String使用联合主键, 在Java中没有对应的类。
Hibernate映射文件是:
| ＜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＞ |
一切的身份验证交给一个继承HandlerInterceptorAdapter的类来做:
| 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; } } |
下面我们需要在Spring的应用上下文配置文件中设置:
| ＜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＞ |
注意到"/admin/*=admin", 所以/admin目录下的所有资源只有在admin组的用户才能访问, 这样就不用担心普通访客删除文章了。使用这种方法, 你不需要在removeArticleController中作身份验证和权限管理, 一切都交给AuthorizeInterceptor。
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