老师，我点启动tomcat后，问题如下，我自己试了好几次都是这样：
xml代码
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<servlet>
<servlet-name>demoServlet</servlet-name>
<servlet-class>com.bjsxt.servlet.DemoServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>demoServlet</servlet-name>
<url-pattern>/demo.do</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>getReq</servlet-name>
<servlet-class>com.bjsxt.servlet.GetRequestDataServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>getReq</servlet-name>
<url-pattern>getInfo.do</url-pattern>
</servlet-mapping>
</web-app>
addUser.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="getInfo.do" method="post">
用户名：<input type="text" name="username"/>
<input type="submit" value="ok"/>
</form>
</body>
</html>
GetRequertDataServlet.java
/**
* 获取请求数据
*/
public class GetRequestDataServlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String username = req.getParameter("username");
PrintWriter out = resp.getWriter();
out.println("<!DOCTYPE HTML PUBLIC '-//W3C//DTD HTML 4.01 Transitional//EN'>");
out.println("<HTML>");
out.println("<HEAD><TITLE>ITBZ</TITLE></HEAD>");
out.println("<BODY>");
out.println("Username:"+username);
out.println("</BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
}
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