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我有一个变量在外部.properties文件中设置，但是当我尝试调用该值时，它会一直返回null。我们有另外一个导入外部.properties文件的项目，它可以正常工作，但即使将它作为模型，我也无法弄清楚为什么这个模块不工作。下面的相关文件。属性文件中的值返回null
具体是什么返回NULL是PropertiesUtil.getProperty("property.file.variable");
的web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<display-name>PROJECT</display-name>
<servlet>
<servlet-name>Jersey REST Service</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>com.bar.foo.rest</param-value>
</init-param>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Jersey REST Service</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
<listener>
<listener-class>com.bar.foo.rest.ListenerClass</listener-class>
</listener>
</web-app>
的applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:tx="http://www.springframework.org/schema/tx"
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/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<tx:annotation-driven />
<context:annotation-config />
<mvc:annotation-driven />
<context:component-scan base-package="com.bar.foo;" />
<context:property-placeholder location="file:${externalConfiguration}" />
<bean id="propertyConfigurer" class="com.bar.foo.utils.PropertiesUtil">
<property name="ignoreResourceNotFound" value="true" />
<property name="ignoreUnresolvablePlaceholders" value="true" />
<property name="locations">
<list>
<value>classpath:PROJECT.properties</value>
<value>file:${externalConfiguration}</value>
</list>
</property>
</bean>
<bean id="configProperties"
class="org.springframework.beans.factory.config.PropertiesFactoryBean">
<property name="ignoreResourceNotFound" value="true" />
<property name="locations">
<list>
<value>classpath:PROJECT.properties</value>
<value>file:${externalConfiguration}</value>
</list>
</property>
</bean>
</beans>
的pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.bar</groupId>
<artifactId>PROJECT</artifactId>
<version>1.30.1-SNAPSHOT</version>
</parent>
<artifactId>PROJECT</artifactId>
<packaging>war</packaging>
<properties>
<org.springframework-version>3.1.0.RELEASE</org.springframework-version>
<spring.batch.version>3.0.0.RELEASE</spring.batch.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<!-- <version>2.3.2</version> -->
<configuration>
<source>1.6</source>
<target>1.6</target>
<compilerArgument>-Xlint:all</compilerArgument>
<showWarnings>true</showWarnings>
<showDeprecation>true</showDeprecation>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<configuration>
<mainClass>org.test.int1.Main</mainClass>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.16</version>
<configuration>
<argLine>-XX:-UseSplitVerifier</argLine>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<!-- This dependency (version unspecified) is needed at runtime by Tomcat.
I don't know why but I had to add it manually. -->
<dependency>
<groupId>asm</groupId>
<artifactId>asm</artifactId>
<version>3.3.1</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-bundle</artifactId>
<version>1.10</version>
</dependency>
<dependency>
<groupId>javax.jdo</groupId>
<artifactId>jdo2-api</artifactId>
<version>2.3-eb</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${org.springframework-version}</version>
<exclusions>
<!-- Exclude Commons Logging in favor of SLF4j -->
<exclusion>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${org.springframework-version}</version>
<exclusions>
<!-- Exclude Commons Logging in favor of SLF4j -->
<exclusion>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${org.springframework-version}</version>
<exclusions>
<!-- Exclude Commons Logging in favor of SLF4j -->
<exclusion>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${org.springframework-version}</version>
<exclusions>
<!-- Exclude Commons Logging in favor of SLF4j -->
<exclusion>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${org.springframework-version}</version>
</dependency>
</dependencies>
</project>
PropertiesUtil.java
package com.bar.foo.utils;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
public class PropertiesUtil extends PropertyPlaceholderConfigurer {
private static Map<String, String> propertiesMap = new HashMap<String, String>();
// Default as in PropertyPlaceholderConfigurer
private int springSystemPropertiesMode = SYSTEM_PROPERTIES_MODE_FALLBACK;
/**
* Workaround: PropertyPlaceholderConfigurer.systemPropertiesMode is not
* directly accessible
*/
@Override
public void setSystemPropertiesMode(int systemPropertiesMode) {
super.setSystemPropertiesMode(systemPropertiesMode);
springSystemPropertiesMode = systemPropertiesMode;
}
@Override
protected void processProperties(ConfigurableListableBeanFactory beanFactory, Properties props) {
super.processProperties(beanFactory, props);
for (Object key : props.keySet()) {
String keyStr = key.toString();
String valueStr = resolvePlaceholder(keyStr, props, springSystemPropertiesMode);
propertiesMap.put(keyStr, valueStr);
}
}
public static String getProperty(String name) {
return propertiesMap.get(name);
}
}