dailyPick.java文件中已经导入了这两个包:

  import javax.servlet.jsp.*;
  import javax.servlet.jsp.tagext.*;
  ...
  public class dailyPick extends TagSupport {
  ...
  }

编译时，出错：
myTagLibdailyPick.java:3: package javax.servlet.jsp does not exist
import javax.servlet.jsp.*;
^
myTagLibdailyPick.java:4: package javax.servlet.jsp.tagext does not exist
import javax.servlet.jsp.tagext.*;
^
myTagLibdailyPick.java:11: cannot resolve symbol
symbol  : class TagSupport
location: class myTagLib.dailyPick
public class dailyPick extends TagSupport {
                               ^
myTagLibdailyPick.java:22: cannot resolve symbol
symbol  : class JspTagException
location: class myTagLib.dailyPick
        public int doStartTag() throws JspTagException {
                                       ^
myTagLibdailyPick.java:89: cannot resolve symbol
symbol  : class JspWriter
location: class myTagLib.dailyPick
                        JspWriter out = pageContext.getOut();
                        ^
myTagLibdailyPick.java:89: cannot resolve symbol
symbol  : variable pageContext
location: class myTagLib.dailyPick
                        JspWriter out = pageContext.getOut();
                                        ^
myTagLibdailyPick.java:96: cannot resolve symbol
symbol  : variable SKIP_BODY
location: class myTagLib.dailyPick
                return (SKIP_BODY);
                        ^
7 errors

环境变量中已经设定了Classpath：
   ..;.;%JAVA_HOME%libtools.jar;

运行环境：winxp

谢谢

你在环境变量中的Classpath加上servlet.jar这个包，如果是tomcat这个包在tomcatlib下。

你是tomcat4的话，在tomcatcommonlib下面。