SpringMVC 回顾servlet

古城微笑少年丶 2023-01-01 05:52 109阅读 0赞

### 文章目录 ###

*  pom
 *  servlet
 *  web.xml
 *  jsp
 *  发送请求测试

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNDcyODc3_size_16_color_FFFFFF_t_70]

# pom #

<dependencies>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>5.1.9.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>servlet-api</artifactId>
                <version>2.5</version>
            </dependency>
            <dependency>
                <groupId>javax.servlet.jsp</groupId>
                <artifactId>jsp-api</artifactId>
                <version>2.2</version>
            </dependency>
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>jstl</artifactId>
                <version>1.2</version>
            </dependency>
        </dependencies>

# servlet #

package com.lyh.servelt;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    
    //实现Servlet接口
    public class HelloServlet extends HttpServlet { 
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { 
            //取得参数
            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");
            }
            //业务逻辑
            //视图跳转
            req.getRequestDispatcher("/WEB-INF/jsp/hello.jsp").forward(req,resp);
        }
    
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { 
            doGet(req,resp);
        }
    }

# web.xml #

<?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">
        
        <servlet>
            <servlet-name>HelloServlet</servlet-name>
            <servlet-class>com.lyh.servelt.HelloServlet</servlet-class>
        </servlet>
        <servlet-mapping>
            <servlet-name>HelloServlet</servlet-name>
            <url-pattern>/test</url-pattern>
        </servlet-mapping>
    </web-app>

# jsp #

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>test</title>
    </head>
    <body>
    	${msg}
    </body>
    </html>

# 发送请求测试 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNDcyODc3_size_16_color_FFFFFF_t_70 1]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNDcyODc3_size_16_color_FFFFFF_t_70 1]: /images/20221120/cb46b147478c4e1bb46e020a87273309.png