Maven资源过滤

Question

我想将构建信息写入属性文件。我找到了 Maven 资源过滤插件。这就是我的 pom 相关部分的样子:

<?xml version="1.0" encoding="UTF-8"?>
<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>
    <parent>
        <groupId>project.mygroup</groupId>
        <artifactId>prject</artifactId>
        <version>1.0-20190130-1</version>
    </parent>

    <artifactId>project-war</artifactId>
    <packaging>war</packaging>
    <version>1.0-20190130-1</version>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <timestamp>${maven.build.timestamp}</timestamp>
        <maven.build.timestamp.format>
        yyy-MM-dd HH:mm
        </maven.build.timestamp.format>

    </properties>

    <dependencies>
    ...
    </dependencies>

    <build>
        <finalName>project</finalName>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>

        <plugins>
            <!-- Create war from the project -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>

            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <encoding>${project.build.sourceEncoding}</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <version>2.4.3</version>
                <configuration>
                    <encoding>${project.build.sourceEncoding}</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>    

</project>

如果开始 mvn clean package构建成功，但我的 build.properties src/main/resources 下的文件将不包含构建信息。

我的属性文件如下所示:

build.version=${pom.version}
build.date=${timestamp}
build.url=${pom.url}
build.name=${pom.name}

我究竟做错了什么？谢谢!

Answer 1

扩展评论/简短回答:

你要看看target/classes ...不在 src/main/resources !;)

... src/main/resources 中的文件保持未过滤/触摸。

Ohh, nice. Sorry, I can found the property file in the target/classes folder. But how can I read this property file from my application?

请参见此处:- Where to place and how to read configuration resource files in servlet based application?

..使用“标准”java:

// assuming src/main/resources/build.properties
Properties buildProps = new Properties();
buildProps.load(
    //this is fail safe for most situations (test/web container/...), but *any classloader* could do it.
            Thread.currentThread().getContextClassLoader()
                    .getResourceAsStream("build.properties")
);
String buildDate = buildProps.getProperty("build.date");

..与(例如) Spring :

@PropertySource("classpath:/build.properties")
...
@Value("${build.date}")
String buildDate;

但是，既然你标记了 java-ee (，你应该有一个非常具体和“复杂”的方式来做到这一点(将属性加载到应用程序中))，所以我们应该问! :)(见: http://www.adam-bien.com/roller/abien/entry/injecting_properties_into_java_ee)

Thank you, now it's ok, but the build time stamp not looks like this format: yyyy-MM-dd HH:mm I have format like this: 1549362759203 Do you have any idea?

嗯，没有线索，到目前为止，......对我来说它按预期工作，生成:

build.date=2019-02-05 10:55

..和(已编辑) Properties.load()代码。

(也许你“覆盖”了 timestamp 属性......这听起来不是一个很好的(个人)属性名称(因为 any1/thing(可以)指的是“时间戳”，更好的是像 com.my.company.myVerySpecialTimestamp ! ?;)
和:看看 target/classes/build.properties告诉你出了什么问题:

maven资源过滤

或属性加载(在您的代码中)

https://maven.apache.org/plugins/maven-resources-plugin/examples/filter.html

https://docs.oracle.com/javase/8/docs/api/java/util/Properties.html

... https://docs.spring.io/spring-boot/docs/current/reference/html/howto-properties-and-configuration.html