SpringMvc框架

springmvc框架是对servlet的封装
mvc：struts2，springmvc

1.springmvc-helloworld

1.1 maven项目（javaee）

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns="http://java.sun.com/xml/ns/javaee" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_1.xsd" version="3.1">
  <display-name>springmvc-hello</display-name>
</web-app>  

1.2 引入springmvc框架

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.dyit.spring</groupId>
  <artifactId>springmvc-hello</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  	<properties>
  		<!-- 定义依赖的版本号-->
  		<project.spring.version>5.3.16</project.spring.version>
  		<project.log.version>1.2.17</project.log.version>
  		<project.lombok.version>1.18.22</project.lombok.version>
  		<project.json.version>2.13.1</project.json.version>
  	
  	</properties>
  
  <dependencies>
  	<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>${project.spring.version}</version>
		</dependency>


  	<dependency>
  		<groupId>log4j</groupId>
  		<artifactId>log4j</artifactId>
  		<version>${project.log.version}</version>
  		
  	</dependency>
  	
  	<dependency>
  		<groupId>org.projectlombok</groupId>
  		<artifactId>lombok</artifactId>
  		<version>${project.lombok.version}</version>
  	</dependency>
  	
  	<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-databind</artifactId>
			<version>${project.json.version}</version>
		</dependency> 
  	
  </dependencies>
</project>

1.3 完成controller层的代码

/**
 * 控制层
 * @author 86184
 *
 */
@Controller
public class publisherController {
	
	@GetMapping("/findAll")
	@ResponseBody//转换成json对象
	public HttpResp findAll() {
		List<Publisher> list = new ArrayList<Publisher>();
		list.add(new Publisher(1, "工人出版社", "武汉"));
		list.add(new Publisher(2, "神话出版社", "广州"));
		list.add(new Publisher(3, "儿童出版社", "长沙"));
		
		HttpResp dto = new HttpResp(2001, "出版社添加成功", list, new Date());
		return dto;
	}
}

1.4 配置springmvc框架

1.4.1 配置IoC容器（mvc容器）

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd">
		
		
	<context:component-scan base-package="com.dyit.controller"/><!-- 自动扫描注解类，并创建对象-->
	<mvc:resources location="static/" mapping="static/**"/> <!-- 不处理静态资源（前端页面） -->
	<mvc:annotation-driven/> <!-- 注解驱动，配合@responsebody-->

</beans>

1.4.2 配置servlet

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns="http://java.sun.com/xml/ns/javaee" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_1.xsd" version="3.1">
  <display-name>springmvc-hello</display-name>
  
   
	<servlet>
		<servlet-name>springDispatcherServlet</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:spring/springmvc-*.xml</param-value> <!-- 配置servlet -->
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>

	
	<servlet-mapping>
		<servlet-name>springDispatcherServlet</servlet-name>
		<url-pattern>/*</url-pattern>  <!-- 拦截所有请求 -->
	</servlet-mapping>
  
</web-app>

1.4.3 postm测试