基于jsp自定义标签，实现用户鉴权

import com.cicc.admin.AdminConstant;import com.cicc.enums.Permission;import java.io.IOException;import java.util.Arrays;import java.util.Set;import java.util.List;import java.util.stream.Collectors;import javax.servlet.jsp.JspContext;import javax.servlet.jsp.JspException;import javax.servlet.jsp.PageContext;import javax.servlet.jsp.tagext.SimpleTagSupport;/** * * @author superxg */public class PermissionTagHandler extends SimpleTagSupport { ???private String permissions; ???@Override ???public void doTag() throws JspException, IOException { ???????Set<Permission> granted = getGrantedPermissions(); ???????if (permissions != null && granted != null) { ???????????List<Permission> permissionList = Arrays.asList(permissions.split(",")).stream().map(x -> Permission.valueOf(x)).collect(Collectors.toList()); ???????????if (permissionList.stream().anyMatch(x -> granted.contains(x))) { ???????????????getJspBody().invoke(null); ???????????} ???????} ???} ???public void setPermissions(String permissions) { ???????this.permissions = permissions; ???} ???/** ????* 获得当前登录员工的权限 ????* ????* @return ????*/ ???private Set<Permission> getGrantedPermissions() { ???????EmployeeBeanSession session = getSession(); ???????if (session != null) { ???????????return session.getPermissions(); ???????} else { ???????????return null; ???????} ???} ???/** ????* 获取当前Session ????* ????* @return ????*/ ???private EmployeeBeanSession getSession() { ???????JspContext context = getJspContext(); ???????Object session = context.getAttribute(AdminConstant.SESSION_KEY, PageContext.SESSION_SCOPE); ???????if (session != null && session instanceof EmployeeBeanSession) { ???????????return (EmployeeBeanSession) session; ???????} ???????return null; ???}}

<?xml version="1.0" encoding="UTF-8"?><taglib version="2.1" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd"> ???<tlib-version>1.0</tlib-version> ???<short-name>gg</short-name> ???<uri>/WEB-INF/tld/platform</uri> ???<tag> ???????<name>permission</name> ???????<tag-class>com.cicc.admin.web.PermissionTagHandler</tag-class> ???????<body-content>scriptless</body-content> ???????<attribute> ???????????<name>permissions</name> ???????????<required>false</required> ???????????<type>java.lang.String</type> ???????</attribute> ???</tag></taglib>