本文整理汇总了Java中javax.servlet.jsp.JspContext.removeAttribute方法的典型用法代码示例。如果您正苦于以下问题：Java JspContext.removeAttribute方法的具体用法？Java JspContext.removeAttribute怎么用？Java JspContext.removeAttribute使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类javax.servlet.jsp.JspContext的用法示例。
在下文中一共展示了JspContext.removeAttribute方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: doTag
import javax.servlet.jsp.JspContext; //导入方法依赖的package包/类
@Override
public void doTag () throws JspException, IOException
{
final JspFragment body = (JspFragment)getJspContext ().getAttribute ( DefineTag.ATTR_PREFIX + this.name );
if ( body == null )
{
throw new JspException ( String.format ( "Unable to find macro '%s'", this.name ) );
}
final JspContext ctx = body.getJspContext ();
// set attributes to body context
final Map<String, Object> oldEntries = new HashMap<> ( this.data.size () );
for ( final Map.Entry<String, Object> entry : this.data.entrySet () )
{
oldEntries.put ( entry.getKey (), ctx.getAttribute ( entry.getKey (), PageContext.PAGE_SCOPE ) );
ctx.setAttribute ( entry.getKey (), entry.getValue (), PageContext.PAGE_SCOPE );
}
// invoke
body.invoke ( getJspContext ().getOut () );
// set old values, so we don't clutter up the context for the next caller
for ( final String key : this.data.keySet () )
{
final Object val = oldEntries.get ( key );
if ( val == null )
{
ctx.removeAttribute ( key, PageContext.PAGE_SCOPE );
}
else
{
ctx.setAttribute ( key, val, PageContext.PAGE_SCOPE );
}
}
}