springboot 自定义权限标签(tld),在freemarker引用操作_JAVA教程

第一步:引入jar包

									<dependency>

									  <groupId>javax.servlet.jsp</groupId>

									  <artifactId>jsp-api</artifactId>

									  <version>2.2.1-b03</version>

									</dependency>

第二步:自定义标签类

									import java.util.Map;

									import java.util.Set;

									import javax.servlet.http.HttpServletRequest;

									import org.jasig.cas.client.authentication.AttributePrincipal;

									import org.springframework.web.servlet.tags.RequestContextAwareTag;

									import com.goodidea.sso.dto.PrivilegesDto;

									import com.goodidea.sso.dto.ResourcesDto;

									import com.goodidea.sso.service.PrivilegesService;

									/**

									 * 

									* @ClassName: PrivilegeTag 

									* @Description: 权限标签类 

									* @author lsg

									* @date 2017年9月12日 下午5:36:01 

									*

									 */

									public class PrivilegeTag extends RequestContextAwareTag{

									  private static final long serialVersionUID = 534416848523276042L;

									  private String menuAlias;

									  private String priAlias;

									  public String getMenuAlias() {

									    return menuAlias;

									  }

									  public void setMenuAlias(String menuAlias) {

									    this.menuAlias = menuAlias;

									  }

									  public String getPriAlias() {

									    return priAlias;

									  }

									  public void setPriAlias(String priAlias) {

									    this.priAlias = priAlias;

									  }

									  @Override

									  protected int doStartTagInternal() {

									    // TODO Auto-generated method stub

									    boolean result = false;

									     try {

									      HttpServletRequest request = (HttpServletRequest) pageContext.getRequest();

									       AttributePrincipal principal = (AttributePrincipal)request.getUserPrincipal();

									       Map<String, Object> attributes = principal.getAttributes();

									      String username=(String) attributes.get("username");

									      PrivilegesService privilegesService= (PrivilegesService)this.getRequestContext().getWebApplicationContext().getBean("privilegesServiceImpl");

									      Set<ResourcesDto> dto = privilegesService.findResourcesByUsername(username);

									      for (ResourcesDto resourcesDto : dto) {

									        if(this.menuAlias.equals(resourcesDto.getAlias())){

									          for (PrivilegesDto pdto : resourcesDto.getPrivileges()) {

									            if(this.priAlias.equals(pdto.getAlias())){

									               result = true;

									            }

									          }

									        }

									      }

									     } catch (Exception e) {

									      // TODO Auto-generated catch block

									      e.printStackTrace();

									      result =false;

									    }

									    return result? EVAL_BODY_INCLUDE : SKIP_BODY;

									  }

									}

第三步:创建tld标签,放入在web-inf下

springboot 自定义权限标签(tld),在freemarker引用操作

									<?xml version="1.0" encoding="UTF-8"?>

									<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN" "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">

									<taglib>

									  <tlibversion>1.0</tlibversion>

									  <jspversion>1.1</jspversion>

									  <shortname>privilege</shortname>

									  <tag>

									    <name>privilege</name>

									    <tagclass>com.goodidea.sso.core.PrivilegeTag</tagclass>

									    <bodycontent>empty</bodycontent> <!--这里如果设为empty,则无body-->

									    <attribute>

									      <name>menuAlias</name>

									      <required>true</required>

									      <rtexprvalue>true</rtexprvalue>

									    </attribute>

									    <attribute>

									      <name>priAlias</name>

									      <required>true</required>

									      <rtexprvalue>true</rtexprvalue>

									    </attribute>

									  </tag>

									</taglib>

第四:页面引用

<#assign p=JspTaglibs["/WEB-INF/tld/privilege.tld"] />

注意tld,如果不在web.xml上进行引入的话,就放在web-inf下,要不然会报找不到tld资源异常

补充知识：Springboot项目 freemarker 引入shiro 标签

springboot集成shiro权限过程略过

一、添加maven 依赖

									<dependency>

									 <groupId>net.mingsoft</groupId>

									 <artifactId>shiro-freemarker-tags</artifactId>

									 <version>0.1</version>

									</dependency>

二、注入FreeMarkerConfigurer，未指定templateLoaderPath时遇到过跳转到页面404问题

									@Bean

									public FreeMarkerConfigurer freeMarkerConfigurer() throws IOException, TemplateException {

									  FreeMarkerConfigurer freeMarkerConfigurer = new FreeMarkerConfigurer();

									  freeMarkerConfigurer.setTemplateLoaderPath("classpath:templates/");

									  freemarker.template.Configuration configuration = freeMarkerConfigurer.createConfiguration();

									  configuration.setDefaultEncoding("UTF-8");

									  //这里可以添加其他共享变量 比如sso登录地址

									  configuration.setSharedVariable("shiro", new ShiroTags());

									  freeMarkerConfigurer.setConfiguration(configuration);

									  return freeMarkerConfigurer;

									}