jsp的自定义标签

<description>Atguigu 1.0 core library</description>
<display-name>Atguigu core</display-name>
<tlib-version>1.0</tlib-version>
<short-name>atguigu</short-name>
<uri>http://www.atguigu.com/survey/tag</uri>

<tag>
     <!-- 标签名 -->
     <name>showTime</name>
     
     <!-- 标签全类名 -->
     <tag-class>com.atguigu.myTag.TagShowTime</tag-class>
     
     <!-- 设置标签体为空 -->
     <body-content>empty</body-content>
</tag>

<!-- 声明标签的属性 -->
<attribute>
     <!-- 属性名 -->
     <name>format</name>
     
     <!-- 属性是否必须 -->
     <required>true</required>
     
     <!-- 属性是否支持EL表达式 -->
     <rtexprvalue>true</rtexprvalue>
</attribute>

public class AuthTag extends SimpleTagSupport {
    private String servletPath;
    @Override
    public void doTag() throws JspException, IOException {
        //获取页面的上下文对象
        PageContext context = (PageContext) getJspContext();
        HttpSession session = context.getSession();
        Admin admin = (Admin)session.getAttribute(GlobalNames.LOGIN_ADMIN);
        if(admin!=null){
            //判断是否有权限访问
            String adminName = admin.getAdminName();
            if("admin".equals(adminName)){
                //显示内容体
                getJspBody().invoke(null);
                return ;
            }
            
            ServletContext servletContext = context.getServletContext();
            WebApplicationContext ioc = WebApplicationContextUtils.getWebApplicationContext(servletContext);
            //用servletPath查询资源数据
            ResMapper resMapper = (ResMapper) ioc.getBean(ResMapper.class);
            Res res = resMapper.getResByServletPath(servletPath);
            System.out.println("servletPath.......... "+servletPath);
            String codeArr= admin.getCodeArr();
            Integer resCode =res.getResCode();
            Integer resPos=res.getResPos();
            //计算验证资源是否可以访问
            boolean authority = DataprocessUtils.checkAuthority(resCode, resPos, codeArr);
            if(authority){
                //显示内容体
                getJspBody().invoke(null);
                return ;
            }
        }
        //上面的条件如果有任何一个不满足，那么就不执行标签体，页面上将不显示标签体
    }
    public void setServletPath(String servletPath) {
        //为了保持与数据库一致，需要加上“/”
        this.servletPath = "/"+servletPath;
    }
}