简单标签-实现自定义标签除了移除java代码的其他四个功能

/控制标签体是否执行
public class SimpleDemo1 extends SimpleTagSupport{

    @Override
    public void doTag() throws JspException, IOException {
        //拿到标签体
        JspFragment jf=this.getJspBody();
        //jf.invoke(this.getJspContext().getOut());拿到标签体不输出就不会显示该标签体
    }
    

}

 

//控制标签体重复输出
public class SimpleDemo2 extends SimpleTagSupport{
    @Override
    public void doTag() throws JspException, IOException {
        //拿到标签体
        JspFragment jf=this.getJspBody();
        for(int i=0;i<5;i++){
            //想当于jf.invoke(this.getJspContext().getOut());
            jf.invoke(null);//默认输给浏览器
        }
    }
    
}

 

//修改标签体，--》大写
public class SimpleDemo3 extends SimpleTagSupport{

    @Override
    public void doTag() throws JspException, IOException {
        //拿到标签体
        JspFragment jf=this.getJspBody();
        StringWriter sw=new StringWriter();
        jf.invoke(sw);
        String value=sw.toString().toUpperCase();
        this.getJspContext().getOut().write(value);
    }
    
}

 

//用简单标签实现是否实现标签体后的jsp代码
public class SimpleDemo4 extends SimpleTagSupport{

    @Override
    public void doTag() throws JspException, IOException {
        throw new SkipPageException();
        
    }
    
}


注意：在传统标签中有标签实体时：tld文件-》<body-content>JSP</body-content>
　　　在简单标签为<body-content>scriptless</body-content>scriptless就是无脚本代码的意思