挂了三天的问题,谁能帮我?

Question

jswdk-1.0.1安装成功了;servlet.jar也分别加到classpath中,复制到jdk\jre\lib中了,还是不能编译.classpath=%java_home%\lib;%java_home%\dt.jar;%java_home%\tools.jar;f:\jswdk-1.0.1\lib\servlet.jar;f:\jswdk-1.0.1\webserver.jar;%java_home%\jre\lib\servlet-api.jar    请问下面这个程序如何才能正确编译运行?
import java.servlet.*;
import java.servlet.http.*;
import javax.servlet.io;
import javax.servlet.util;
public class ReqInfoServlet extends HttpServlet
{
public void service(HttpServletRequst req,HttpServletResponse res)
throws IOException
{
ServletOutputStream os;
Enumeration paramValue;
String paramName,paramValue;
Enumeration hdrNames;
String hdrDate,hdrName,hdrValue;
res.setContentType("text/plain");
PrintWrite pw = new PrintWrite(res.getOutputStream());
pw.println("Request protocol is "+
req.getPotocol());
pw.println("Request scheme is "+req.getScheme());
pw.println("Remote host is "+req.getRemoteHost());
pw.println("Remote address is "+req.getScheme());
pw.println("Receiving server is "+ req.getServerName()+"on oprt number"+req.getServerPort());
pw.println();
pw.println("Header data  is :");
while(hdrNames.hasMoreElements())
{
hdrName=(String)hdrNames.nextElement();
gdrValue=(String)req.getHeader(hdrName);
pw.println("name="+hdrName+"; value="+hdrValue);
}
pw.println();
paramNames=req.getParameterNames();
while(hdrNames.hasMoreElements)
{
hdrName=(String)hdrName.nextElement();
hdrValue=(String)req.getHeader(hdrName);
pw.println("name="+hdrName+";value="+hdrValue);
}
pw.println();
paramNames=req.getParameterNames();
pw.println("Request parameters are:");
while(paramNames.hasMoreElements())
{
paramName=(String)paramName.nextElement();
paramValue=(String)req.getParameter(paramName);
pe.println("name="+paramName+";value="+paramValue);
}
pw.flush();
pw.close();
}
}先表示感谢!

Answer 1

先表感谢!
提示信息是:
F:\jswdk-1.0.1\examples\WEB-INF\servlets\ReqInfoServlet.java:1: package javax.servlet does not exist
import javax.servlet.*;
^
我把TOMCAT的\common\lib下的servlet-api加到classpath中也一样.

Answer 2

我就想试着自己编个servlet,一个星期都没成功,我身边的人谁也不明白

Answer 3

可能是系统无法识别引用的servlet
环境变量中的servlet-api.jar和servlet.jar重复
去掉一个试试

Answer 4

1.用ide编译
2.指定classpath
3.将jar文件放入,jdk\jre\ext\lib，不是jdk\jre\lib

Answer 5

package javax.servlet does not exist
缺包

Answer 6

package com.ch.net.house.saleUsed;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class ReqInfoServlet extends HttpServlet
{
public void service(HttpServletRequest req,HttpServletResponse res)
throws IOException
{
ServletOutputStream os;
Enumeration paramValue;
String paramName,gdrValue;
Enumeration hdrNames;
String hdrDate,hdrName,hdrValue;
res.setContentType("text/plain");
PrintWriter pw = new PrintWriter(res.getOutputStream());
pw.println("Request protocol is "+
req.getProtocol());
pw.println("Request scheme is "+req.getScheme());
pw.println("Remote host is "+req.getRemoteHost());
pw.println("Remote address is "+req.getScheme());
pw.println("Receiving server is "+ req.getServerName()+"on oprt number"+req.getServerPort());
pw.println();
pw.println("Header data  is :");
while(hdrNames.hasMoreElements())
{
hdrName=(String)hdrNames.nextElement();
gdrValue=(String)req.getHeader(hdrName);
pw.println("name="+hdrName+"; value="+hdrValue);
}
pw.println();
paramName=req.getParameterNames();//以下都还有错！
while(hdrNames.hasMoreElements)
{
hdrName=(String)hdrName.nextElement();
hdrValue=(String)req.getHeader(hdrName);
pw.println("name="+hdrName+";value="+hdrValue);
}
pw.println();
paramName=req.getParameterNames();
pw.println("Request parameters are:");
while(paramName.hasMoreElements())
{
paramName=(String)paramName.nextElement();
paramValue=(String)req.getParameter(paramName);
pe.println("name="+paramName+";value="+paramValue);
}
pw.flush();
pw.close();
}
}代码问题太多了我修改不下去了！

Answer 7

1、最初classpath中只有servlet.jar
2、jar已放入jdk\jre\ext\lib中
3、servlet.jar已存于f:\jswdk-1.0.1中

Answer 8

HttpServletRequst 应为 HttpServletRequest
Enumeration paramValue;
String paramName,paramValue;  paramValue重复PrintWrite 应为 PrintWriter 随便举几个列。。唉太多问题了

Answer 9

java -classpath \servlet.jar try again

Answer 10

/* $Id: RequestInfoExample.java,v 1.2 1999/03/17 02:36:51 duncan Exp $
 *
 */import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
 * Example servlet showing request information.
 *
 * @author James Duncan Davidson <[email protected]>
 */public class RequestInfoExample extends HttpServlet {
    ResourceBundle rb = ResourceBundle.getBundle("LocalStrings");    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>");        String title = rb.getString("requestinfo.title");
        out.println("<title>" + title + "</title>");
        out.println("</head>");
        out.println("<body bgcolor=\"white\">");        // img stuff not req'd for source code html showing
// all links relative!

        out.println("<a href=\"../servlets/reqinfo.html\">");
        out.println("<img src=\"../images/code.gif\" height=24 " +
                    "width=24 align=right border=0 alt=\"view code\"></a>");
        out.println("<a href=\"../servlets/index.html\">");
        out.println("<img src=\"../images/return.gif\" height=24 " +
                    "width=24 align=right border=0 alt=\"return\"></a>");        out.println("<h3>" + title + "</h3>");
        out.println("<table border=0><tr><td>");
        out.println(rb.getString("requestinfo.label.method"));
        out.println("</td><td>");
        out.println(request.getMethod());
        out.println("</td></tr><tr><td>");
        out.println(rb.getString("requestinfo.label.requesturi"));
        out.println("</td><td>");        
        out.println(request.getRequestURI());
        out.println("</td></tr><tr><td>");        
        out.println(rb.getString("requestinfo.label.protocol"));
        out.println("</td><td>");        
        out.println(request.getProtocol());
        out.println("</td></tr><tr><td>");
        out.println(rb.getString("requestinfo.label.pathinfo"));
        out.println("</td><td>");        
        out.println(request.getPathInfo());
        out.println("</td></tr><tr><td>");
        out.println(rb.getString("requestinfo.label.remoteaddr"));
        out.println("</td><td>");                
        out.println(request.getRemoteAddr());
        out.println("</table>");
    }    public void doPost(HttpServletRequest request,
                      HttpServletResponse response)
        throws IOException, ServletException
    {
        doGet(request, response);
    }}以上程序是servlet自带的程序，可以运行，但我无法编译

Answer 11

package com.ch.net.house.saleUsed;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class ReqInfoServlet extends HttpServlet
{
public void service(HttpServletRequest req,HttpServletResponse res)
throws IOException
{
ServletOutputStream os;
Enumeration paramValue;
String paramName,gdrValue;
Enumeration hdrNames;
String hdrDate,hdrName,hdrValue;
res.setContentType("text/plain");
PrintWriter pw = new PrintWriter(res.getOutputStream());
pw.println("Request protocol is "+
req.getProtocol());
pw.println("Request scheme is "+req.getScheme());
pw.println("Remote host is "+req.getRemoteHost());
pw.println("Remote address is "+req.getScheme());
pw.println("Receiving server is "+ req.getServerName()+"on oprt number"+req.getServerPort());
pw.println();
pw.println("Header data  is :");
while(hdrNames.hasMoreElements())
{
hdrName=(String)hdrNames.nextElement();
gdrValue=(String)req.getHeader(hdrName);
pw.println("name="+hdrName+"; value="+hdrValue);
}
pw.println();
paramValue=req.getParameterNames();
while(hdrNames.hasMoreElements)//
{
hdrName=(String)paramValue.nextElement();
hdrValue=(String)req.getHeader(hdrName);
pw.println("name="+hdrName+";value="+hdrValue);
}
pw.println();
paramValue=req.getParameterNames();
pw.println("Request parameters are:");
while(paramValue.hasMoreElements())
{
paramName=(String)paramValue.nextElement();
gdrValue=(String)req.getParameter(paramName);
pw.println("name="+paramName+";value="+gdrValue);
}
pw.flush();
pw.close();
}
}

Answer 12

在我的电脑，右键，高级，环境变量里的classpath添加一个.....\servlet.jar所在的路径就可以了

Answer 13

程序有太多错误，建议先写一个简单的。import 的时候也是有顺序的，先import java.io.*因为servlet要用到IoExceptionPrintWriter而不是PrintWrite还有重复定义...错误

Answer 14

这是java数据库开发与专业应用书上的例题.
错误虽多,但基本都是同一种类的
servlet.jar我已加到classpath中

Answer 15

qczl1224(倾请一世) 的程序编译错误为:
F:\Program Files\Xinox Software\JCreator Pro\MyProjects\ReqInfoServlet.java:6: package javax.servlet does not exist
import javax.servlet.ServletOutputStream;
                     ^

Answer 16

qczl1224(倾请一世) 的程序编译错误为:
F:\Program Files\Xinox Software\JCreator Pro\MyProjects\ReqInfoServlet.java:6: package javax.servlet does not exist
import javax.servlet.ServletOutputStream;代码错误修好了在编译吧， 错误太多给出的报错信息不一定就是对的，懂编程的都知道！

Answer 17

原因只有两个1 你用winzip解开servlet-api.jar，看看里面的目录结构是否为javax\servlet,下面是否就是有所有*.class了。2 你说把servlet-api.jar包放到classpath下，请问题是指哪个目录？你试试放到${JDK_HOME}/jre\lib\ext下

Answer 18

把tomcate/common/lib中的servlet-api.jar放到jdk\jre\lib\ext中应该可以了