创建第一个springmvc程序

创建第一个springmvc程序

1、创建父项目文件,导入依赖,删除src文件夹

pom.xml文件

<dependencies>
 <dependency>
 <groupId>junit</groupId>
 <artifactId>junit</artifactId>
 <version>4.12</version>
 <scope>test</scope>
 </dependency>
 <!-- https://mvnrepository.com/artifact/javax.servlet.jsp.jstl/jstl-api -->
 <dependency>
 <groupId>javax.servlet.jsp.jstl</groupId>
 <artifactId>jstl-api</artifactId>
 <version>1.2</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/javax.servlet.jsp/javax.servlet.jsp-api -->
 <dependency>
 <groupId>javax.servlet.jsp</groupId>
 <artifactId>javax.servlet.jsp-api</artifactId>
 <version>2.3.3</version>
 <scope>provided</scope>
 </dependency>
 <dependency>
 <groupId>javax.servlet</groupId>
 <artifactId>servlet-api</artifactId>
 <version>2.5</version>
 </dependency>
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-webmvc</artifactId>
 <version>5.3.20</version>
 </dependency>
 <dependency>
 <groupId>org.projectlombok</groupId>
 <artifactId>lombok</artifactId>
 <version>1.18.24</version>
 </dependency>
 </dependencies>

2、创建子项目文件,导入jar包

pom.xml

<dependencies>
 <dependency>
 <groupId>javax.servlet.jsp</groupId>
 <artifactId>javax.servlet.jsp-api</artifactId>
 <version>2.3.3</version>
 </dependency>
 <dependency>
 <groupId>javax.servlet</groupId>
 <artifactId>servlet-api</artifactId>
 <version>2.5</version>
 </dependency>
 </dependencies>

3、右键子项目文件,添加框架支持,选中web框架

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">
 <!--写死的-->
 <servlet>
 <servlet-name>springmvc</servlet-name>
 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
 <init-param>
 <param-name>contextConfigLocation</param-name>
 <!--根据classpath创建spring对应的applicationContext.xml文件-->
 <param-value>classpath:springmvc-servlet.xml</param-value>
 </init-param>
 <!--启动级别:1为服务器启动就开启,值越接近1优先级越高-->
 <load-on-startup>1</load-on-startup>
 </servlet>
 <!--在springmvc中,
	/ :会匹配所有请求,除了jsp
	/* :会匹配所有请求,包括jsp,会导致无限循环的hello.jsp.jsp.jsp.....
	-->
 <servlet-mapping>
 <servlet-name>springmvc</servlet-name>
 <url-pattern>/</url-pattern>
 </servlet-mapping>
</web-app>

4、创建applicationContext.xml文件,添加对应bean

<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://www.springframework.org/schema/beans
 http://www.springframework.org/schema/beans/spring-beans.xsd">
 
<!--添加spring的BeanNameUrlHandlerMapping、SimpleControllerHandlerAdapter和InternalResourceViewResolver-->
 
 <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
 <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>
 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver">
 <!--根据prefix找到文件夹目录,根据suffix找到对应类型的文件-->
 <property name="prefix" value="/WEB-INF/jsp/"/>
 <property name="suffix" value=".jsp"/>
 </bean>
 <!--将写好的servlet类加入bean中,id为请求的路径-->
 <bean id="/hello" class="com.kuang.controller.HelloController"/>
</beans>

5、编写bean中对应的servlet类

package com.kuang.controller;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//实现controller接口,重写handleRequest方法,返回一个视图
public class HelloController implements Controller {
 @Override
 public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
 //新建一个modelandview
 ModelAndView mv = new ModelAndView();
 
 //添加对象
 mv.addObject("msg","HelloSpringMVC");
 
 //设置返回的视图,不需要后缀名,在applicationcontext中添加过suffix
 mv.setViewName("hello");
 
 //将对应视图返回
 return mv;
 }
}

6、可能遇到的问题

404找不到文件

不是你代码的问题,可以查看依赖是否成功导入

7、通过tomcat启动运行,在浏览器中访问http://localhost:8080/hello

程序运行成功

作者:高同学,你好原文地址:https://www.cnblogs.com/nhgtx/p/16897498.html

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