刚开始学servlet，跟着书写了一段但是一直无法打开什么原因啊？
找了好久都无法解决。
并且该项目创建时左下角就一直有一个红叉叉。
Tomcat页面可以正常打开。
代码：
package cc.openhome;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/Hello")
public class Hello extends HttpServlet {
// @Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
String name = request.getParameter("name");
PrintWriter out= response.getWriter();
out.print("<!doctype html>");
out.print("<html>");
out.print("<head>");
out.print("<title> Hello </title>");
out.print("</head>");
out.print("<body>");
out.printf("<h1> Hello! %s!%n</h1>",name);
out.print("</body>");
out.print("</html>");
}
}
