在propreties文件中引用另一个properties文件中的内容

转载：http://www.avajava.com/tutorials/lessons/how-do-i-filter-resources-based-on-values-from-a-properties-file.html?page=1

 

 

 

How do I filter resources based on values from a properties file?

Author: Deron Eriksson

Description: This tutorial describes how to filter resources based on properties in a file.

Tutorial created using: Windows Vista || JDK 1.6.0_04 || Eclipse Web Tools Platform 2.0.1 (Eclipse 3.3.1)

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In another tutorial, we saw how we could filter resource files so that we could replace references to properties with the values of those properties and how this substitution takes place during the "process-resources" default lifecycle phase. We can also specify properties in a properties file and use these properties in the substitutions during the "process-resources" lifecycle phase.

For example, suppose we have the following resource file.

src/main/resources/textfile.txt

this is a test
artifact id: ${project.artifactId}
my.property: ${my.property}

The project.artifactId property value comes from the project's pom.xml, but we'd like the my.property to be specified in a properties file, such as the following:

src/main/filters/myfilter.properties

my.property=hamburger and fries

The project containing the resource file and the filter properties file are shown here:

Here is the project's pom.xml file. It specifies to use the properties in the myfilter.properties file via the build.filters.filter value. It specifies to turn on filtering by setting build.resources.resource.filtering to true. It specifies the resource directory via the build.resources.resource.directory (this is needed since we overrid the default behavior by setting filtering to true).

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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.maventest</groupId>
	<artifactId>aproject</artifactId>
	<packaging>jar</packaging>
	<version>1.0-SNAPSHOT</version>
	<name>aproject</name>
	<url>http://maven.apache.org</url>
	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>
	</dependencies>
	<build>
		<filters>
			<filter>src/main/filters/myfilter.properties</filter>
		</filters>
		<resources>
			<resource>
				<directory>src/main/resources</directory>
				<filtering>true</filtering>
			</resource>
		</resources>
	</build>
</project>



page2：

Now, I'll perform a "mvn clean process-resources" on the project.

This generates the target/classes/textfile.txt file.

If we examine the contents of the textfile.txt file, we can see that it has been filtered to contain the property values. The project.artifactId value came from the pom.xml file, and the my.property value came from the myfilter.properties file.

target/classes/textfile.txt

this is a test
artifact id: aproject
my.property: hamburger and fries