一、介紹
spirng + spring-mvc + mybaits 幾乎已經成爲了java後端後端開發的最基本的組合。雖然現在大家都用springb-boot,但是spring-boot封裝過度,新手都不知道怎麼跑起來的,比如像我這樣的新手:(!
二、搭建項目
打開IDEA -> Create New Project
點擊next填好信息
添加spring-web-mvc依賴
<?xml version="1.0" encoding="UTF-8"?>
<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>top.taoeer</groupId>
<artifactId>spring-mvc-mybatis</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
</dependencies>
</project>
只添加一個spring-webmvc就行了,其它需要依賴spring-webmvc的依賴表裏有,會自動導入的。
好了,目前爲止開發web的依賴已經可以了。接下來我們先弄個hello world試一下。
爲了讓項目跑起來,我們還需要tomcat,爲了簡單起見,我這裏採用tomcat7-maven-plugin這個tomcat maven的插件。tomcat7-maven-plugin需要將package設置爲war。下面是當前的pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<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>top.taoeer</groupId>
<artifactId>spring-mvc-mybatis</artifactId>
<version>1.0-SNAPSHOT</version>
<!-- tomcat7-maven-plugin需要將packaging設置爲war -->
<packaging>war</packaging>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
<configuration>
<!-- 將tomcat的context設置爲 / , 默認爲當前項目名稱 -->
<path>/</path>
</configuration>
</plugin>
</plugins>
</build>
</project>
接下來配置spring-mvc
先給項目添加web功能
點擊設置web所在目錄
目錄結構如下
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>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
在webapp/WEB-INF/下創建spring-mvc配置文件spring-servlet.xml:
<?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 https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<context:component-scan base-package="top.taoeer" />
<mvc:annotation-driven />
</beans>
創建HomeController:
package top.taoeer.controllers;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HomeController {
@GetMapping("/")
public String home() {
return "home page";
}
}
目錄結構如下:
一個spring-mvc項目就已經搭建完成了,下面跑起來測試一下。
打開 http://localhost:8080
頁面顯示錶示我們的第一個spring-mvc項目已經搭建成功