1.src文件夹(颜色为蓝色)里创建包“Servlet”方便分类
2.包里创建Servlet，即“Create New Servlet”，命名为“Servlet1”下方会自动改为相同，其余选项不用更改。

Servlet1代码如下

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;
//上方为引入包
@WebServlet("/Servlet1")
//这里需要注意：删除“name=”，加上/，表示为根目录
public class Servlet1 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);//调用get方法体。
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        PrintWriter out = response.getWriter();//页面输出，响应getWriter方法。
        out.print("succse");//输出“success”
    }
}

现在可以去测试一下，运行index.jsp