书上的简单例子却javac不过，请高手指点__Morning_println_class_symbol_java_

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书上的简单例子却javac不过，请高手指点

来源: 互联网发布时间：2014-12-29

本文导语: 下面是书上的例子 //===================== Morning.java ==================== import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class Morning extends HttpServlet { public void service(HttpServletRequest req, ...

下面是书上的例子
//===================== Morning.java ====================
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Morning extends HttpServlet
  {
  public void service(HttpServletRequest req,
                      HttpServletResponse res)
  throws ServletException, IOException
    {
    res.setContentType("text/html; charset=Big5");
    PrintWriter pw=res.getWriter();
    pw.println("");
    pw.println("");
    pw.println("Morning");
    pw.println("");
    pw.println("");
    pw.println("Good Morning!!
");
    pw.println("Ν!!");
    pw.println("");
    pw.println("");
    }
  }
但是我在命令行中输入javac Morning.java，得到的结果为
import javax.servlet.http.*;
^
Morning.java:5: cannot resolve symbol
symbol  : class HttpServlet
location: class Morning
public class Morning extends HttpServlet
                             ^
Morning.java:7: cannot resolve symbol
symbol  : class HttpServletRequest
location: class Morning
  public void service(HttpServletRequest req,
                      ^
Morning.java:8: cannot resolve symbol
symbol  : class HttpServletResponse
location: class Morning
                      HttpServletResponse res)
                      ^
Morning.java:9: cannot resolve symbol
symbol  : class ServletException
location: class Morning
  throws ServletException, IOException
         ^
6 errors
这是为何？
另外，我在autoexec.bat中输入：
@echo off
prompt $p$g
path.;c:jbuilder4jdk1.3bin;
set classpath=.;c:jbuilder4jdk1.3libtools.jar
@echo on
应该没问题吧？（我安装了JBuilder4.0,JDK就用它自带的）

你去sun的网站上down一个jsdk2_1-win.zip,
然后，把它里面的*.jar放到c:jbuilder4jdk1.3jrelibext(如果没有目录，那么自己建)
然后，去掉autoexec.bat里的classpath.
然后，在计算机里查找java.exe,只留下c:jbuilder4jdk1.3bin里的那个，删除其它的。
就不会再出现其它错误了。

http://www.csdn.net/expert/topic/85/85391.shtm