下面是一個spring注入的簡單demo
建一個包為 com.lzyer.ouput下面接口
package com.lzyer.ouput;
public interface IOutputGenerator {
public void generateOutput();
}
建立一個實作包com.lzyer.output.impl
package com.lzyer.ouput.impl;
import com.lzyer.ouput.IOutputGenerator;
public class CsvOutputGenerator implements IOutputGenerator{
public void generateOutput() {
System.out.println("This is csv ouputgenerator...");
}
}
src下applicationContext.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:task="http://www.springframework.org/schema/task"
xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd">
<bean id="csv" class="com.lzyer.ouput.impl.CsvOutputGenerator"/>
<!--
設定注入
<bean id="helper" class="com.lzyer.ouput.test.OutputHelper">
<property name="outputGenerator" ref="csv"></property>
</bean>
-->
<!-- 構造注入 -->
<bean id="helper" class="com.lzyer.ouput.test.OutputHelper">
<constructor-arg>
<ref bean="csv"/>
</constructor-arg>
</bean>
</beans>
建立一個包com.lzyer.ouput.test用來注入的類
package com.lzyer.ouput.test;
import com.lzyer.ouput.IOutputGenerator;
public class OutputHelper {
IOutputGenerator outputGenerator;
public void outputGenerator(){
outputGenerator.generateOutput();
}
//構造注入
public OutputHelper(IOutputGenerator outputGenerator){
this.outputGenerator = outputGenerator;
}
/* 設定注入
* public void setOutputGenerator(IOutputGenerator outputGenerator) {
this.outputGenerator = outputGenerator;
}
*/
}
測試類
public class App {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
OutputHelper helper = (OutputHelper)context.getBean("helper");
helper.outputGenerator();
}
}
沒有強制規定使用哪種注入方式,設定注入使用友善簡單,是以用得比較多