如何编译含servlet类的*.java 文件

把servlet.jar放到%JAVA_HOME%\jre\lib\ext试试

Try it:
1.Write a Test Servlet:
Directory:C:\tmp\test\HelloWorld2.java
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;public class HelloWorld2 extends HttpServlet {
  public void doGet(HttpServletRequest  request,HttpServletResponse  response) throws IOException,ServletException {
             response.setContentType("text/html");
             PrintWriter  out=response.getWriter();
             out.println("<html>");
             out.println("<body>");
             out.println("<head>");
             out.println("<title>Hello World Modify!</title>");
             out.println("</head>");
             out.println("<body>");
             out.println("<h1>Hello World Modify!</h1>");
             out.println("</body>");
             out.println("</html>");
             }
}
2.Compile Servlet:
C:\tmp\test>set classpath=.;D:\Tomcat 4.1\common\lib\servlet.jar
C:\tmp\test>javac HelloWorld2.java3.run Servlet with Servlet Engine.
servlet的包路径是这个吗？
%tomcat_home%\common\lib\servlet.jar
应该是：
%tomcat_home%\lib\servlet.jar
吧，好好看看路径。