我一直在苦苦挣扎一段时间才能让这些物业运转起来,但是我没有运气。我的项目中有两个配置XML文件,一个是servlet配置,另一个是全局spring config xml。
Servlet config 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 config 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>
因此,spring xml上面的属性访问工作正常,因为属性文件在同一范围内加载。
这是我正在加载xml的web.xml:
<?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>
但是,我在servlet范围内有一个bean,我正在尝试使用@Value,但它始终为null。
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;
}
}
}
调试时环境为空,与两个字符串属性相同。也许我没有正确使用代码,但是有没有办法在父代和servlet之间共享属性?
P.S我知道有一种方法可以在注释中提供默认值,但请忽略我自己手动完成的事实。
答案 0 :(得分:0)
你应该:
一个。添加默认值,
湾您的默认值是包含冒号(:)的URL。对此URL值使用单引号(或根据您的spring版本保留它。请参阅:Spring @Value escape colon(:) in default value)
@Value("${registry.retrieveserviceurl:http://localhost:8090/registry/rest/retrieveServiceInfo}")
String registryRetrieveServicesUrl;
@Value("${registry.errorserviceurl:http://localhost:8090/registry/rest/notifyError}")
String registryErrorUrl;
或Spring 4.2:
arr_int = arr.astype('int64')
答案 1 :(得分:0)
似乎你没有正确加载servlet上下文,
变化,
<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</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/servlet-config.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>test-servlet</servlet-name>
<url-pattern>/api/*</url-pattern>
</servlet-mapping>
答案 2 :(得分:0)
原来问题是由于在我编写的依赖模块中使用了错误的属性holder configurer。我使用的是ServletContextPropertyPlaceholderConfigurer,而是需要使用PropertySourcesPlaceholderConfigurer。