我编写的servlet总是显示不了。配置如下：tomcat安装目录下：webapps新建目录sql(里有文件web-inf)web-inf目录下有classes文件夹（里有servlet.class）.还有字写得web.xml文件。
servlet.java内容如下：
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.*;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class servlet extends HttpServlet{
private static final String content="text/html;charset=gb2312";
public void init()throws ServletException{
}
public void doPost(HttpServletRequest request,HttpServletResponse respone)
throws ServletException,IOException{
doGet(request,respone);
}
public void doGet(HttpServletRequest request,HttpServletResponse respone)
throws ServletException,IOException{
respone.setContentType(content);
PrintWriter out=respone.getWriter();
out.println(" <html>");
out.println(" <head> <title>用户登录 </title> </head>");
out.println(" <form method =\"post\" action=\"/servlet\">");
out.println(" <table>");
out.println(" <tr>");
out.println(" <td valigin=\"top\">用户名 </td>");
out.println(" <td valigin=\"top\">");
out.println("input type=\"text\" name=\"username\" size=\"20\"");
out.println(" <td>");
out.println(" <tr>");
out.println(" <tr>");
out.println(" <td valigin=\"top\">密码 </td>");
out.println(" <td valigin=\"top\">");
out.println("input type=\"password\" name=\"password\" size=\"20\"");
out.println(" <td>");
out.println(" <tr>");
out.println(" <tr> <td valign=\"top\">");
out.println("input type=\"submit\" value=\"登陆\" ");
out.println(" </td>");
out.println(" </tr>");
out.println(" </table>");
out.println(" </form> </body> </html>");
out.close();
}
public void destory(){
}
}
web.xml如下：
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<display-name>Welcome to Tomcat </display-name>
<description>Welcome to Tomcat </description>
<servlet>
<servlet-name>servlet </servlet-name>
<servlet-class>sql.servlet </servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>servlet </servlet-name>
<url-pattern>/servlet </url-pattern>
</servlet-mapping>
</web-app>
输入 http://localhost:8080/sql/servlet
报错：type Status report
message
description The requested resource () is not available.
怎么回事呢？
