Jsp tag file例子以及说明(19)

    return this.number; 
  } 
 
  public void setNumber(java.lang.String number) { 
    this.number = number; 
    jspContext.setAttribute("number", number); 
  } 
 
  public java.lang.String getPower() { 
    return this.power; 
  } 
 
  public void setPower(java.lang.String power) { 
    this.power = power; 
    jspContext.setAttribute("power", power); 
  } 
 
...... 
 
  public void doTag() throws javax.servlet.jsp.JspException, java.io.IOException { 
    javax.servlet.jsp.PageContext _jspx_page_context = (javax.servlet.jsp.PageContext)jspContext; 
    javax.servlet.http.HttpServletRequest request = (javax.servlet.http.HttpServletRequest) _jspx_page_context.getRequest(); 
    javax.servlet.http.HttpServletResponse response = (javax.servlet.http.HttpServletResponse) _jspx_page_context.getResponse(); 
    javax.servlet.http.HttpSession session = _jspx_page_context.getSession(); 
    javax.servlet.ServletContext application = _jspx_page_context.getServletContext(); 
    javax.servlet.ServletConfig config = _jspx_page_context.getServletConfig(); 
    javax.servlet.jsp.JspWriter out = jspContext.getOut(); 
    _jspInit(config); 
    jspContext.getELContext().putContext(javax.servlet.jsp.JspContext.class,jspContext); 
    if( getNumber() != null )  
      _jspx_page_context.setAttribute("number", getNumber()); 
    if( getPower() != null )  
      _jspx_page_context.setAttribute("power", getPower()); 
 
    try { 
      out.write(" \r\n"); 
      out.write("\r\n"); 
      out.write("\r\n"); 
      out.print(Math.pow(Double.parseDouble(number), Double.parseDouble(power))); 
    } catch( java.lang.Throwable t ) { 
      if( t instanceof javax.servlet.jsp.SkipPageException ) 
          throw (javax.servlet.jsp.SkipPageException) t; 
      if( t instanceof java.io.IOException ) 
          throw (java.io.IOException) t; 
      if( t instanceof java.lang.IllegalStateException )