[英]Spring - “context:property-placeholder” - property priority
[英]not able to get property using context:property-placeholder (Spring)
我正在嘗試從“文件”中讀取屬性,但無法達到相同的目的。
web.xml中
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:ApplicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
applicationContext.xml中
<context:annotation-config />
<context:component-scan base-package="com.jodo.image.*"></context:component-scan>
<context:property-placeholder location="file:/usr/local/jodo/opt/cms-image/db.properties"/>
<context:property-placeholder location="file:/usr/local/jodo/opt/cms-image/service.properties"/>
<util:properties id="systemPropertiesHolder" location="file:/usr/local/jodo/opt/cms-image/service.properties">
</util:properties>
類ThreadFileImageUpload
public class ThreadFileImageUpload extends Thread {
private String rawImagePath;
@Value("#{systemPropertiesHolder.rawImagePath}")
public void setRawImagePath(String property){
rawImagePath = property;
}...
結果:rawImagePath為空
類ThreadFileImageUpload
@Configuration
@ImportResource("classpath:properties-config.xml")
public class ThreadFileImageUpload extends Thread {
private @Value("${rawImagePath}") String rawImagePath;
性能-config.xml中
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-3.0.xsd">
<context:property-placeholder location="file:/usr/local/jodo/opt/cms-image/service.properties"/>
</beans>
結果:rawImagePath為空
類ThreadFileImageUpload
@Configuration
@PropertySource("file:/usr/local/jodo/opt/cms-image/service.properties")
public class ThreadFileImageUpload extends Thread {
@Autowired
Environment environment;
private String rawImagePath;
public void run() {
if(environment == null){
logger.info("environment is NULL");
}
rawImagePath = this.environment.getProperty("rawImagePath");
...
給出java.lang.NullPointerException(環境本身為null)
類ThreadFileImageUpload
public class ThreadFileImageUpload extends Thread {
@Value("${rawImagePath}")
private String rawImagePath;
結果:rawImagePath為空
ApplicationContext.xml(現在將所有文件放在一個屬性占位符中)
<context:property-placeholder location="file:/usr/local/jodo/opt/cms-image/db.properties, file:/usr/local/jodo/opt/cms-image/service.properties"/>
類ThreadFileImageUpload
public class ThreadFileImageUpload extends Thread {
@Value("${rawImagePath}")
private String rawImagePath;
結果:rawImagePath為空
ThreadFileImageUpload類
package com.jodo.image.util;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class ThreadFileImageUpload extends Thread {
@Value("#{systemPropertiesHolder.rawImagePath}")
private String rawImagePath;
AppliactionContext.xml
<context:annotation-config />
<context:component-scan base-package="com.jodo.image.*"></context:component-scan>
<util:properties id="systemPropertiesHolder" location="file:/usr/local/jodo/opt/cms-image/service.properties">
</util:properties>
仍然得到它null
我確定屬性文件具有必填字段
[root@localhost /]# cat /usr/local/jodo/opt/cms-image/service.properties
rawImagePath=/var/jodo-images/raw/
我仍然停留在同一個地方。
無論您使用@Value注入屬性,注入的類都必須是Spring bean。 為此,您需要使用@Component注釋ThreadFileImageUpload並確保掃描組件中的包中的類,或者您需要手動添加該bean(在這種情況下,將其添加到ApplicationContext.xml中)。
我認為您缺少屬性的名稱(根)。 看到這個http://forum.spring.io/forum/spring-projects/container/61645-value-and-propertyplaceholderconfigurer
如果文件是service.properties
並且您有
`<util:properties id="service" location="classpath:com/acme/app/service.properties"/>`
然后嘗試@Value("#{service.rawImagePath}")
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