我照着网上一篇教程 《Spring入门》 演练了一遍,然后又在网上搜了搜,说Spring东西不是很多,核心就是IoC和AOP,其中又以IoC使用最为广泛。如此说来,我已经算入门啦?
IoC,依赖注入,实质是面向接口编程,在asp.net mvc里使用Autofac,早已习惯;
AOP,实际就是拦截器,不用修改什么代码,不知不觉就起作用,也好理解。
不管咋样,先记录一下心得:
1、下载Spring
Spring的官网 没有ZIP直接下载的,要用构建工具来下载,但天朝特色,呵呵。搜了搜,有这样一个网址可下载,版本稍低,但也算很新了:
http://maven.springframework.org/release/org/springframework/spring/2、使用Spring
1)IoC
package Spring1; import org.springframework.context.ApplicationContext; import org.springframework.context.support.FileSystemXmlApplicationContext; public class Main { public static void main(String[] args) throws Exception{ //IServiceBean service = new MyServiceBean(); ApplicationContext context = new FileSystemXmlApplicationContext("beans.xml");//IoC IServiceBean service = (IServiceBean)context.getBean("service"); .... } }
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean id="service" class="Spring1.MyServiceBean" /> </beans>
2)AOP
代码不用做什么更改,只改配置文件。将配置文件beans.xml增强,改为:
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean id="serviceTarget" class="Spring1.MyServiceBean" /> <!-- 日志 --> <bean id="logAdvisor" class="Spring1.LogAdvisor" /> <!-- 将密码以星号返回 --> <bean id="passwordAdvisorTarget" class="Spring1.PasswordAdvisor" /> <bean id="passwordAdvisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor"> <property name="advice"> <ref local="passwordAdvisorTarget"/> </property> <property name="patterns"> <list> <value>.*getPassword</value> </list> </property> </bean> <!-- 异常处理 --> <bean id="exceptionAdvisor" class="Spring1.ExceptionAdvisor" /> <bean id="service" class="org.springframework.aop.framework.ProxyFactoryBean"> <property name="proxyInterfaces"><value>Spring1.IServiceBean</value></property> <property name="target"><ref local="serviceTarget"/></property> <property name="interceptorNames"> <list> <value>logAdvisor</value> <value>passwordAdvisor</value> <value>exceptionAdvisor</value> </list> </property> </bean> </beans>
这个XML看起来内容还不少,但仔细琢磨一下,还是能看懂。