tomcat 问题

不好意思刚才写错了：
三个action 分别是
action="/servlet/readUrl"
action="/servlet/HelloWorldServlet"
action="/servlet/test"

首先检查几个servlet的名字和配置文件中是不是一致，java是区分大小写的
如果一致还是出错的话，那么是不是在web.xml的配置文件在更改后没有重启tomcat
配置文件在更改后一定要重启tomcat才行的

javax.servlet.ServletException: Error instantiating servlet class readUrl
       at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:895)
       at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:655)
       at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
       at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
       at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
       at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
readUrl初始化错误。要不把这个servlet贴出来看看

class readUrl extends HttpServlet
{
static final private String CONTENT_TYPE = "text/html; charset=GBK";
private DocumentBuilderFactory dbf;
private DocumentBuilder db;
private Document doc;
public void init() throws ServletException
{
}
//Process the HTTP Get request
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
doPost(request,response);
}
//Process the HTTP Post request
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
response.setContentType(CONTENT_TYPE);
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head><title>Servlet1</title></head>");
out.println("<body>");

out.println("ecvet");
out.println("</body></html>");
}
//Clean up resources
public void destroy()
{
}}
servlet 很简单，问题是HelloWorldServlet运行正常，readUrl不正常

Servlet命名错误
不可以用readUrl来命名servlet
换一个其他名字
究其原因么
我个人认为可能是因为你所import进的包的类中已经有了readUrl()这个方法
所以不可以重名

不好意思，刚才自己也糊涂了
用readUrl试可以的
我这里全部正常

public class readUrl extends HttpServlet
{
static final private String CONTENT_TYPE = "text/html; charset=GBK";
private DocumentBuilderFactory dbf;
private DocumentBuilder db;
private Document doc;
public void init() throws ServletException
{
}
//Process the HTTP Get request
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
doPost(request,response);
}
//Process the HTTP Post request
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
response.setContentType(CONTENT_TYPE);
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head><title>Servlet1</title></head>");
out.println("<body>");

out.println("ecvet");
out.println("</body></html>");
}
//Clean up resources
public void destroy()
{
}} 你忘了写public，而且按照习惯写法，通常会将doPost()写成这样
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
doGet(request,response);
}
doGet就像你写的doPost一样。

你忘了写public，而且按照习惯写法，通常会将doPost()写成这样
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
doGet(request,response);
}
doGet就像你写的doPost一样。

你的关键字冲突了，改成下面的就没问题了。import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;public class readUrl extends HttpServlet
{
static final private String CONTENT_TYPE = "text/html; charset=GBK";
// private DocumentBuilderFactory dbf;
// private DocumentBuilder db;
// private Document doc;

public void init() throws ServletException
{
}

//Process the HTTP Get request
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
{
doPost(req,resp);
}
//Process the HTTP Post request
public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
{
resp.setContentType(CONTENT_TYPE);
PrintWriter out = resp.getWriter();
out.println("<html>");
out.println("<head><title>Servlet1</title></head>");
out.println("<body>");
out.println("ecvet");
out.println("</body></html>");
}
//Clean up resources
public void destroy()
{
}}

艾
我脑子也被你搞糊涂了
自己调试了一遍终于知道你错在哪里了类名声明的时候错了
要声明readUrl类为public
class readUrl extends HttpServlet
改为:
public class readUrl extends HttpServlet
就可以了
原因是如果不声明访问类型，则默认为private

所以根本无法访问到
呵呵

你继承了一个public类，需要加上关键字public,上面的代吗我直接放到weblogic6.1下可以正常运行。

不声明类型报错：
The server encountered an internal error () that prevented it from fulfilling this request.javax.servlet.ServletException: Error instantiating servlet class readUrl
//产生异常，实例化Servlet类readUrl时错误java.lang.IllegalAccessException: Class org.apache.catalina.core.StandardWrapper can not access a member of class readUrl with modifiers ""
//产生无法访问异常

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