java - 使用自定义 ClassPathResource 配置 Spring 4 PropertySourcesPlaceholderConfigurer

Question

如何使用自定义 .properties 文件为不同的环境(生产、开发、暂存)配置 PropertySourcesPlaceholderConfigurer？在部署 spring 时抛出“无法解析字符串值“classpath:${property.placeholder}”中的占位符 'property.placeholder'”“

这是我的 pom.xml

<profiles>
    <profile>
        <id>dev</id>
        <activation>
            <activeByDefault>true</activeByDefault>
        </activation>
        <properties>
          <property.placeholder>_developer.properties</property.placeholder>
        </properties>
    </profile>
    <profile>
        <id>staging</id>
        <activation>
            <activeByDefault>false</activeByDefault>
        </activation>
        <properties>
            <property.placeholder>_staging.properties</property.placeholder>
        </properties>
    </profile>
    <profile>
        <id>production</id>
        <activation>
            <activeByDefault>false</activeByDefault>
        </activation>
        <properties>
            <property.placeholder>_production.properties</property.placeholder>
        </properties>
    </profile>
</profiles>

这里是 PropertySourcesPlaceholderConfigurer 配置

static @Bean
public PropertySourcesPlaceholderConfigurer myPropertySourcesPlaceholderConfigurer() {
    PropertySourcesPlaceholderConfigurer p = new PropertySourcesPlaceholderConfigurer();
    org.springframework.core.io.Resource[] resourceLocations = new org.springframework.core.io.Resource[] {
            new ClassPathResource("${property.placeholder}")
    };
    p.setLocations(resourceLocations);
    return p;
}

它在 xml spring 配置中工作，但如果我使用 java 配置则不起作用。知道它是如何工作的吗？

Answer 1

我找到了另一种方法来做我想做的事:

首先我将这个插件添加到我的 pom.xml 中的构建部分:

<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>properties-maven-plugin</artifactId>
    <version>1.0-alpha-2</version>
    <executions>
        <execution>
            <id>1</id>
            <phase>initialize</phase>
            <goals>
                <goal>read-project-properties</goal>
            </goals>
            <configuration>
                <files>
                    <file>src/main/resources/${property.placeholder}</file>
                </files>
            </configuration>
        </execution>
        <execution>
            <id>2</id>
            <phase>generate-resources</phase>
            <goals>
                <goal>write-project-properties</goal>
            </goals>
            <configuration>
                <outputFile>
                    ${project.build.outputDirectory}/application.properties
                </outputFile>
            </configuration>
        </execution>
    </executions>
</plugin>

第二次我在我的 spring 配置文件中修改 PropertySourcesPlaceholder 配置:

static @Bean
public PropertySourcesPlaceholderConfigurer myPropertySourcesPlaceholderConfigurer() {
    PropertySourcesPlaceholderConfigurer p 
        = new PropertySourcesPlaceholderConfigurer();
    org.springframework.core.io.Resource[] resourceLocations 
        = new org.springframework.core.io.Resource[] {
            new ClassPathResource("application.properties")
    };
    p.setLocations(resourceLocations);
    return p;
}

我还将此注释添加到我的 spring 配置类中:

@PropertySource("classpath:application.properties")

所以现在我将依赖环境的属性写入不同的属性文件(如“_developer.properties”或“_staging.properties”)，当我使用 Maven 构建项目时，它已被复制到我使用的“application.properties”在 PropertySourcesPlaceholder 配置中