springMVC使用自定义标签控制按钮显示

	1. 以下为java代码：
        package com.fh.tag;
        import javax.servlet.http.HttpServletRequest;
        import javax.servlet.jsp.JspException;
        import javax.servlet.jsp.tagext.BodyTagSupport;
        
        import org.springframework.web.context.WebApplicationContext;
        import org.springframework.web.context.support.WebApplicationContextUtils;
        
        import com.fh.service.system.permission.PermissionService;
        
        public class PermissionTag extends BodyTagSupport {
        	
        	/**
        	 * 
        	 */
        	private static final long serialVersionUID = -8534443755590632585L;
        	private String res;
        	
        	public String getRes() {
        		return res;
        	}
        
        	public void setRes(String res) {
        		this.res = res;
        	}
        
        	@Override
        	public int doStartTag() throws JspException {
        		HttpServletRequest request = (HttpServletRequest)this.pageContext.getRequest();
                WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(request.getSession().getServletContext());
                PermissionService permissionService = (PermissionService)wac.getBean("permissionService");
                
                try {
        			if (permissionService.hasPermissionRes(res)) {
        				return EVAL_BODY_INCLUDE;
        			} else {
        				return SKIP_BODY;
        			}
        		} catch (Exception e1) {
        			e1.printStackTrace();
        			return SKIP_BODY;
        		}
        	}
        }

2. 以下为java代码的项目位置：
   

3. 以下为tld文件的代码：

        
        
        	1.0
        	1.2
        	permTag
        	http://itheima/permTag
        	Common Tag
        	Common Tag library
        	
        		perm
        		com.fh.tag.PermissionTag
        		JSP
        		  
                    res
                    false  
                    true
                    java.lang.String
                 
        	
        
   

4. 以下为tld文件的项目位置：
   

5. 在jsp页面中应用tag：

    <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
    <%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt"%>
    <%
    	String path = request.getContextPath();
    	String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>
    <%@ taglib prefix="permTag" uri="http://itheima/permTag"%>
    
    
    	
    		
    		
    		<%@ include file="../admin/top.jsp"%> 
    		
     	    
            
    	
    
    	
    			按钮