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我一直在努力一段時間來獲得屬性的工作，但我沒有運氣。我的項目中有兩個配置XML文件，一個是servlet配置，另一個是全局彈簧配置xml。Spring @Value訪問屬性在父上下文中加載
servlet配置XML：
<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:mvc="http://www.springframework.org/schema/mvc"
xmlns:task="http://www.springframework.org/schema/task"
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-4.3.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.3.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd">
<task:annotation-driven />
<context:component-scan base-package="com.test.loadbalancer"></context:component-scan>
<mvc:annotation-driven />
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/jsp/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
Spring配置XML：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:int="http://www.springframework.org/schema/integration"
xmlns:int-http="http://www.springframework.org/schema/integration/http"
xmlns:int-amqp="http://www.springframework.org/schema/integration/amqp"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:security="http://www.springframework.org/schema/security"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:rabbit="http://www.springframework.org/schema/rabbit"
xsi:schemaLocation="http://www.springframework.org/schema/integration
http://www.springframework.org/schema/integration/spring-integration-4.3.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/integration/amqp http://www.springframework.org/schema/integration/amqp/spring-integration-amqp.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.3.xsd
http://www.springframework.org/schema/util/ http://www.springframework.org/schema/util/spring-util.xsd
http://www.springframework.org/schema/integration/http http://www.springframework.org/schema/integration/http/spring-integration-http.xsd
http://www.springframework.org/schema/security
http://www.springframework.org/schema/security/spring-security-4.1.xsd
http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd">
<bean class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer">
<property name="ignoreUnresolvablePlaceholders" value="false"/>
<property name="locations">
<list>
<value>classpath:com/test/loadbalancer/config.properties</value>
</list>
</property>
</bean>
<rabbit:connection-factory id="connectionFactory" host="${RABBIT_MQ_HOST}" port="${RABBIT_MQ_PORT}" username="${RABBIT_MQ_USER}" password="${RABBIT_MQ_PASS}" /> <!-- This works fine -->
</beans>
，是因爲該屬性文件在同一裝在上面的Spring的XML屬性訪問工作正常範圍。
這裏就是我在加載XML的web.xml文件：
<?xml version="1.0" encoding="UTF-8"?>
<web-app metadata-complete="true" version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name>Test Application</display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-config.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>test</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>test</servlet-name>
<url-pattern>/api/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
</web-app>
不過，我在servlet範圍在那裏我試圖用@Value豆，但它總是空。
package com.test.loadbalancer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import com.test.micro.util.registry.NotificationMessage;
@Component
public class RegistryEndpointEnricher {
private static final String defaultRetrieveServiceURL = "http://localhost:8090/registry/rest/retrieveServiceInfo";
private static final String defaultErrorServiceURL = "http://localhost:8090/registry/rest/notifyError";
@Value("${registry.retrieveserviceurl}")
String registryRetrieveServicesUrl;
@Value("${registry.errorserviceurl}")
String registryErrorUrl;
@Autowired
private Environment env;
public String getEndpoint(NotificationMessage nmMessage) {
populateURLs();
String registryURl = null;
switch (nmMessage.getNotificationType()) {
case RETRIEVESERVICEINFO:
registryURl = registryRetrieveServicesUrl;
break;
case ERROR:
registryURl = registryErrorUrl;
break;
default:
break;
}
return registryURl;
}
private void populateURLs() {
if (StringUtils.isEmpty(registryRetrieveServicesUrl)) {
registryRetrieveServicesUrl = defaultRetrieveServiceURL;
}
if (StringUtils.isEmpty(registryErrorUrl)) {
registryErrorUrl = defaultErrorServiceURL;
}
}
}
我調試時環境爲空，與兩個字符串屬性相同。也許我沒有正確使用代碼，但有沒有一種方法來共享父級和servlet之間的屬性？
P.S我知道有一種方法可以在註釋中提供默認值，但請忽略我自己手動完成的事實。
你是如何加載上下文的？ – kuhajeyan
我使用我的web.xml更新了 –