helloworldtag.java~1~

本书中的源代码是以JBuilder工程形式组织的

package mytag;
import java.io.IOException;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
/**
 *
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */
public class HelloWorldTag extends TagSupport
{
  /**
   *
   * @return
   * @throws JspTagException
   */
    public int doStartTag() throws JspTagException {
                return EVAL_BODY_INCLUDE;
    }
    /**
     *
     * @return
     * @throws JspTagException
     */
        public int doEndTag() throws JspTagException {
                String dateString = new Date().toString();
                try {
                        pageContext.getOut().write("Hello world.<br/>");
                }
                catch (IOException ex) {
                        throw new JspTagException("错误：不能输出到页面");
                }
                return EVAL_PAGE;
        }
}