[英]Spring Dependency injection with factory(dynamic value)
我是春天的新手。
我有一個rulefactory,它將根據類型值從靜態方法返回一個實例
現在,我將從主要方法參數中獲取類型。
現在,我想將參數類型傳遞給工廠方法getInstance類型參數。
怎么做。
/ *工廠類,getInstance將返回RuleEvaluation的子類型,為簡單起見,我沒有提供SingleRuleEvaluation和MassRuleEvaluation的Implementation類。 基本上兩個類都實現RuleEvaluation * /
public class RuleEvalFactory {
public static RuleEvaluation getInstance(String type) {
if (type != null && type.equals("Single")) {
return new SingleRuleEvaluation();
} else if (type != null && type.equals("mass")) {
return new MassRuleEvaluation();
}
return null;
}
}
/ *我的Main類,我需要在這里基於type(dyamic)的RuleEvaluation實例不知道該怎么做。 * /
public class MyApp {
public static void main(String args[]) {
ApplicationContext context =
new ClassPathXmlApplicationContext("Spring-All-Module.xml");
String type = args[0];
/* i want to pass the above type String to the factory method and get the instance how to do that */
RuleEvaluation re = (HarmonyService) context.getBean("rulefactory") ;
}
}
/ *我的Spring xml配置文件* /
Spring 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"
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-3.0.xsd">
<bean id="instanceMethodFactory" class="test.factory.RuleEvalFactory"> </bean>
<!-- i dont know how to pass the dynamic type from the Myapp main
method into this constructory argument -->
<bean id="rulefactory" factory-bean="instanceMethodFactory" factory-method="getInstance">
<constructor-arg index="0"> </constructor-arg>
</bean>
</beans>
請提供Spring xml和Myapp main方法中的代碼如何將類型注入工廠方法的getInstance中。
此致Raghu
您需要在Bean中指定構造函數參數,
<bean id="myBean" class="A" scope="prototype">
<constructor-arg value="0"/> <!-- dummy value -->
</bean>
然后將值傳遞給bean工廠,
getBean("myBean", argument);
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