javax.servlet.http.HttpServlet.service这是在哪个包里面啊

Question

错误：
         cn.com.jbaptech.javaoraprj.faqtool.CommandException: AddCommand:No Driver Available!
cn.com.jbaptech.javaoraprj.faqtool.AddCommand.execute(AddCommand.java:35)
cn.com.jbaptech.javaoraprj.faqtool.FaqAdminServlet.service(FaqAdminServlet.java:25)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

Answer 1

javax.servlet.http.HttpServlet在servlet-api.jar

Answer 2

那怎样将它导入到工程里面？我用的是myeclipse

Answer 3

这是运行环境中的包，不需要导入到 classpath 中的。

Answer 4

那我这是什么错啊
错误：
  at cn.com.jbaptech.javaoraprj.faqtool.AddCommand.execute(AddCommand.java:35)
at cn.com.jbaptech.javaoraprj.faqtool.FaqAdminServlet.service(FaqAdminServlet.java:25)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)AddCommand.java代码：
package cn.com.jbaptech.javaoraprj.faqtool;import javax.servlet.*;
import javax.servlet.http.*;public class AddCommand implements Command {
  private String next;  public AddCommand(String next) {
    this.next = next;
  }  public String execute(HttpServletRequest req)
    throws CommandException {
    try {
      if (CommandToken.isValid(req)) {
FaqRepository faqs = FaqRepository.getInstance();
FaqBean faq = new FaqBean();
faq.setQuestion(req.getParameter("question"));
faq.setAnswer(req.getParameter("answer"));
faqs.put(faq);
req.setAttribute("faqtool.msg", "FAQ Added Successfully");
      }
      else {
req.setAttribute("faqtool.msg", "Invalid Reload Attempted");
      }
      return next;
    }
    catch (FaqRepositoryException fe) {
      throw new CommandException("AddCommand: " + fe.getMessage());
    }
  }
}FaqAdminServlet.java代码：
package cn.com.jbaptech.javaoraprj.faqtool;import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.http.HttpServlet.*;
import java.util.*;public class FaqAdminServlet extends HttpServlet {
  private HashMap commands;
  private String error = "error.jsp";
  private String jspdir = "/faqtool/";  public void init(ServletConfig config) throws ServletException {
    super.init(config);
    initCommands();
  }  public void service(HttpServletRequest req,
      HttpServletResponse res)
    throws ServletException, IOException {
    String next;
    try {
      Command cmd = lookupCommand(req.getParameter("cmd"));
      next = cmd.execute(req);
      CommandToken.set(req);
    }
    catch (CommandException e) {
      req.setAttribute("javax.servlet.jsp.jspException", e);
      next = error;
    }
    RequestDispatcher rd;
    rd = getServletContext().getRequestDispatcher(jspdir + next);
    rd.forward(req, res);
  }  private Command lookupCommand(String cmd)
    throws CommandException {
    if (cmd == null)
      cmd = "main-menu";
    if (commands.containsKey(cmd.toLowerCase()))
      return (Command)commands.get(cmd.toLowerCase());
    else
      throw new CommandException("Invalid Command Identifier");
  }  private void initCommands() {
    commands = new HashMap();
    commands.put("main-menu", new NullCommand("menu.jsp"));
    commands.put("abort", new AbortCommand("menu.jsp"));
    commands.put("add", new NullCommand("add.jsp"));
    commands.put("do-add", new AddCommand("menu.jsp"));
    commands.put("update-menu", new GetAllCommand("upd_menu.jsp"));
    commands.put("update", new GetCommand("update.jsp"));
    commands.put("do-update", new UpdateCommand("menu.jsp"));
    commands.put("delete-menu", new GetAllCommand("del_menu.jsp"));
    commands.put("delete", new GetCommand("delete.jsp"));
    commands.put("do-delete", new DeleteCommand("menu.jsp"));
  }
}求救！！！！！！！！！！！！！

Answer 5

还有个错误：
cn.com.jbaptech.javaoraprj.faqtool.CommandException: AddCommand:No Driver Available!

Answer 6

这个方法的错    35行错了public String execute(HttpServletRequest req)
  throws CommandException {
  try {
  if (CommandToken.isValid(req)) {
FaqRepository faqs = FaqRepository.getInstance();
FaqBean faq = new FaqBean();
faq.setQuestion(req.getParameter("question"));
faq.setAnswer(req.getParameter("answer"));
faqs.put(faq);
req.setAttribute("faqtool.msg", "FAQ Added Successfully");
  }
  else {
req.setAttribute("faqtool.msg", "Invalid Reload Attempted");
  }
  return next;
  }
  catch (FaqRepositoryException fe) {
  throw new CommandException("AddCommand: " + fe.getMessage());
  }
  }
}

Answer 7

就这个方法错了   你自己找找吧  

public String execute(HttpServletRequest req)throws CommandException {异常信息写的啊 没有有效的驱动

Answer 8

很少用MyEclipse，一般都tomcat+Eclipse，那个jar在tomcat下就有，看看你的 部署环境吧

Answer 9

tomcat要部署环境吗？我以前还都没部署过

Answer 10

可以把你TOMCAT 解压开的common/lib目录下的servlet-API jar 复制到项目里