答：代码如下：
import javax.servlet.jsp.tagext.*;
import javax.servlet.jsp.*;
import java.io.*;
public class Timetag extends SimpleTagSupport{
private boolean isServer = true;
public void setServer(boolean isServer){
this.isServer = isServer;
}
第45 页共59 页
public void doTag() throws JspException, IOException{
JspWriter out = getJspContext().getOut();
if(isServer) {
out.println(new java.util.Date());
}else{
out.println(“<script language=”javascript”>”);
out.println(“document.write(new Date());”);
out.println(“</script>”);
}
}
}
