Question

最近我决定和Spring一起玩。我做了一些教程，直到我尝试使用多个属性文件时，一切似乎都很好。正如互联网所说，做

之类的事就足够了

<bean  class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="ignoreUnresolvablePlaceholders" value="true"/>
        <property name="ignoreResourceNotFound" value="true"/>
        <property name="location">
            <list>
                <value>classpath:readData.properties</value>
                <value>classpath:sendMail.properties</value>
            </list>
        </property>
</bean>

嗯，不幸的是它不起作用。令人惊讶的是，这个版本适用于（对于一个属性文件夹）：

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location">
                <value>classpath:readData.properties</value>
        </property>
</bean>

控制台说如下：

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0' defined in class path resource [Beans.xml]: Initialization of bean failed; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert property value of type 'java.util.ArrayList' to required type 'org.springframework.core.io.Resource' for property 'location'; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [java.util.ArrayList] to required type [org.springframework.core.io.Resource] for property 'location': PropertyEditor [org.springframework.core.io.ResourceEditor] returned inappropriate value of type [java.util.ArrayList]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:529)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:198)
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:657)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:461)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at corrected_reminder.Reminder.main(Reminder.java:25)
Caused by: org.springframework.beans.TypeMismatchException: Failed to convert property value of type 'java.util.ArrayList' to required type 'org.springframework.core.io.Resource' for property 'location'; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [java.util.ArrayList] to required type [org.springframework.core.io.Resource] for property 'location': PropertyEditor [org.springframework.core.io.ResourceEditor] returned inappropriate value of type [java.util.ArrayList]
    at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:468)
    at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:494)
    at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:488)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1433)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1392)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1128)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    ... 10 more
Caused by: java.lang.IllegalArgumentException: Cannot convert value of type [java.util.ArrayList] to required type [org.springframework.core.io.Resource] for property 'location': PropertyEditor [org.springframework.core.io.ResourceEditor] returned inappropriate value of type [java.util.ArrayList]
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:260)
    at  org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:448)
    ... 16 more

有人可以帮助我吗？

修改

@Denis Makarskiy 我已经尝试了很多次，但没有令人满意的结果。现在我有了

Exception in thread "main" org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Cannot locate BeanDefinitionDecorator for element [property-placeholder]
Offending resource: class path resource [Beans.xml]

Answer 1

您正在使用多个属性文件，请使用“位置”而不是“位置”。对于单个属性，您可以使用“location”。

检查api doc： https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/core/io/support/PropertiesLoaderSupport.html#setLocations-org.springframework.core.io.Resource...-

Answer 2

您可以使用context：property-placeholder标记指定多个属性文件。

示例：

<context:property-placeholder location="readData.properties,
                                            sendMail.properties"/>

不要忘记将上下文架构添加到beans标记中，如下所示：

<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-3.1.xsd
                        http://www.springframework.org/schema/context
                        http://www.springframework.org/schema/context/spring-context-3.1.xsd>

bean名称的常量错误

2 个答案: