Question

我有两个豆。我想OtherBean取决于SomeBean。如果我写的是显式depends-on="someBean"，那就行了。但是我也想从配置文件depends-on="${depends.bean}"中读取bean名称，但是它不起作用。

线程“主”中的异常 org.springframework.beans.factory.NoSuchBeanDefinitionException：没有定义名为“ $ {depends.bean}”的bean

属性是在构造函数中读取的，而不是在depends-on属性中读取的。

我的示例项目：

SomeBean.java：

package my.package;

public class SomeBean {
    public SomeBean(String example) {
        System.out.println("Example some: " + example);
    }
}

OtherBean.java：

package my.package;

public class OtherBean {
    public OtherBean(String example) {
        System.out.println("Example other: " + example);
    }
}

application-context.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-3.0.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <context:property-placeholder location="classpath:configuration.properties" />

    <bean id="someBean" class="my.package.SomeBean">
        <constructor-arg value="${example.some}" />
    </bean>

    <bean id="otherBean" class="my.package.OtherBean"
        depends-on="${depends.bean}">
        <constructor-arg value="${example.other}" />
    </bean>
</beans>

Runner类StartApp.java：

package my.package;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class StartApp {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("application-context.xml");
    }
}

configuration.properties：

example.some=abc
example.other=def
depends.bean=someBean

Spring bean依赖项：从属性读取XML中的bean名称

0 个答案: