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>
5.配置Tomcat
