Web开发学习(4)添加spring应用

印象中似乎没做过不用spring的项目,因为它在web开发中的确属于那种百利而无一害的神奇..
首先添加需要的jar包

<!-- spring-->
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-core</artifactId>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-beans</artifactId>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-context</artifactId>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-aop</artifactId>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-tx</artifactId>
	</dependency>
	<dependency>
		<groupId>org.aspectj</groupId>
		<artifactId>aspectjrt</artifactId>
	</dependency>
	<dependency>
		<groupId>org.aspectj</groupId>
		<artifactId>aspectjweaver</artifactId>
	</dependency>
	<dependency>
		<groupId>cglib</groupId>
		<artifactId>cglib-nodep</artifactId>
	</dependency>

注意不要忘了与struts整合的插件包

<dependency>
		<groupId>org.apache.struts</groupId>
		<artifactId>struts2-spring-plugin</artifactId>
	</dependency>

下一步在创建在src目录下创建applicationContext.xml文件

<?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:jee="http://www.springframework.org/schema/jee"
	xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"
	default-lazy-init="true" default-autowire="byName">

	<context:component-scan base-package="dao,service,web" />
	
</beans>

以上我们没用配置任何bean,配置了 component表示,spring的依赖注入可通过注解的方式来执行,而且指定spring只在dao service web 三个包下进行扫描

然后我们就可以在web.xml配置核心监听器了

<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>
			classpath*:applicationContext.xml
		</param-value>
	</context-param>
<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>

	<!-- Spring 刷新Introspector防止内存泄露 -->
	<listener>
		<listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
	</listener>

配置基本完成,下面是一个基本的依赖注入
首先创建 HelloDao 并标注为@Component

@Component
public class HelloDao {
	
	public String sayHello(String name){
		
		return "你好,"+name;
		
	}

}

其次servie

@Service
public class HelloService {
	
	@Autowired
	private HelloDao helloDao;
	
	public String sayHello(int i){
		
		String name = "";
		
		if(i==1){
			name="张三";
		}else{
			name = "李四";
		}
		
		return helloDao.sayHello(name);
	}

}

对,注解就是这么简单 只要添加@Autowired就搞定了,当然action层也是一样

@Autowired
	private HelloService helloService;

	@Action(value = "say")
	public String say() {

		name = helloService.sayHello(1);
		
		System.out.println(name);

		this.setTemplate("body", "/hello.jsp");

		return "onePage";
	}

我喜欢注解的最大原因就是在这边了,配置非常简便
注:以上三个类分别在 dao service 和web包下,也就是component-scan指定的包