Javaweb学习笔记day09---ModelBaseServlet类

最新推荐文章于 2022-10-09 22:55:07 发布

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#服务器 #java #前端

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这篇博客介绍了如何利用ModelBaseServlet类来解决在JavaWeb开发中由于每个业务请求对应一个Servlet导致的项目冗余问题。通过使用ModelBaseServlet，可以减少Servlet的数量，提高代码的复用性和项目的组织效率。

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ModelBaseServlet类

概述
- 之前，一个业务请求就对应一个Servlet，这样就导致有特别多的Servlet，项目过于冗余了。可以使用ModelBaseServlet来解决。
代码实现

public class ModelBaseServlet extends ViewBaseServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //method=addUser
        String methodName = request.getParameter("method");
        try {
            Method method = this.getClass().getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
            method.invoke(this, request, response);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
}

@WebServlet("/user")
public class UserServlet extends ModelBaseServlet {

    public void addUser(HttpServletRequest request, HttpServletResponse response) throws IOException {
        System.out.println("UserServlet addUser");
        String username = request.getParameter("username");
        System.out.println("username = " + username);
        String password = request.getParameter("password");
        System.out.println("password = " + password);
        //向浏览器发送响应正文“helloworld”
        response.getWriter().write("helloworld");
    }

    public void deleteUser(HttpServletRequest request, HttpServletResponse response) {
        System.out.println("UserServlet deleteUser");
    }

    public void updateUser(HttpServletRequest request, HttpServletResponse response) {
        System.out.println("UserServlet updateUser");
    }

    public void selectUser(HttpServletRequest request, HttpServletResponse response) {
        System.out.println("UserServlet selectUser");
    }

}

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <base th:href="@{/}">
    <title>ModelBaseServlet类</title>
</head>
<body>

<a href="user?method=addUser&username=root&password=12345">添加用户</a>
<a href="user?method=deleteUser">删除用户</a>
<a href="user?method=updateUser">修改用户</a>
<a href="user?method=selectUser">查询用户</a>

</body>
</html>