回顾Servlet开发

1.建立的文件

2.servlet

package com.shao.servlet;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

public class HelloServlet extends HttpServlet {

    @Override

    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        //1.获取前端参数

        String method = req.getParameter("method");

        if(method.equals("add")){

            req.getSession().setAttribute("msg", "执行了add方法");

        }

        if(method.equals("delete")){

            req.getSession().setAttribute("msg", "执行了delete方法");

        }

        //2.调用业务层

        //3.视图转发或者重定向

        req.getRequestDispatcher("/WEB-INF/jsp/test.jsp").forward(req,resp);

    }

    @Override

    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        //用doPost调用doGet

        doGet(req, resp);

    }

}

3.欢迎界面和跳转界面jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

<head>

    <title>Title</title>

</head>

<body>

    <form action="/hello" method="post">

        <input type="text" name="method">

        <input type="submit">

    </form>

</body>

</html>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

<head>

    <title>Title</title>

</head>

<body>

${msg}

</body>

</html>

4.注册servlet

<?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">

    <!--注册servlet-->

    <servlet>

        <servlet-name>hello</servlet-name>

        <servlet-class>com.shao.servlet.HelloServlet</servlet-class>

    </servlet>

    <servlet-mapping>

        <servlet-name>hello</servlet-name>

        <url-pattern>/hello</url-pattern>

    </servlet-mapping>

    <session-config>

        <session-timeout>15</session-timeout>

    </session-config>

    <!--欢迎页-->

    <!--<welcome-file-list>-->

    <!--    <welcome-file>index.jsp</welcome-file>-->

    <!--</welcome-file-list>-->

</web-app>

巴特西

回顾Servlet开发

1.建立的文件

2.servlet

3.欢迎界面和跳转界面jsp

4.注册servlet

5.配置Tomcat

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