Java Web框架基础知识注解 servlet WebServlet

@WebServlet使用注解来实现servlet和url的映射。
1、HelloServlet.java。

import java.io.IOException;

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 HelloServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setAttribute("usercode", "9001");
        req.getRequestDispatcher("/WEB-INF/view/hello.jsp").forward(req, resp);
    }

}

2、WEB-INF/view/hello.jsp。

<%@ page pageEncoding="UTF-8" %>
<html>
<head>
    <title>Hello</title>
</head>
<body>

<h1>Hello ${usercode}</h1>

</body>
</html>

3、http://localhost:8080/demo/hello

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