Java 使用自定义类路径资源配置Spring4属性资源占位符配置器

如何为不同的环境（生产环境、开发环境、暂存环境）配置带有自定义.properties文件的PropertySourcesPlaceholderConfigurer？在部署时，spring抛出“无法解析字符串值中的占位符”property.placeholder“类路径：${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>

---

它在XMLSpring配置中工作，但如果我使用java配置，它就不工作。你知道怎么做吗

使用

System.getProperty（）

获取环境变量

示例代码：

Environment env = new Environment(new ClassResourceLocator(ClassUtils.getDefaultClassLoader()), System.getProperty("env"));

创建

属性资源占位符配置器
Bean:

@Bean
public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer()
{
    PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer = new PropertySourcesPlaceholderConfigurer();
    propertySourcesPlaceholderConfigurer.setPropertySources(new MyPropertySources());
    return propertySourcesPlaceholderConfigurer;
}

MyPropertySources.java

public class MyPropertySources implements PropertySources{
    private List<PropertySource<?>> sources = new ArrayList<>();

    public EnvironmentPropertySources()
    {
        Environment env = new Environment(new ClassResourceLocator(ClassUtils.getDefaultClassLoader()), System.getProperty("env"));
        PropertySource<?> source = ...; 
        // create class that extends PropertySource<String> and get property values from Environment
        sources.add(source);
    }

    @Override
    public Iterator<PropertySource<?>> iterator() {
        return sources.iterator();
    }

    @Override
    public boolean contains(String name) {
        return true;
    }

    @Override
    public PropertySource<?> get(String name) {
        return sources.get(0);
    }
}

公共类MyPropertySources实现PropertySources{
私有列表源=。。。；
//创建扩展PropertySource并从环境中获取属性值的类
来源。添加（来源）；
}
@凌驾
公共迭代器get（字符串名称）{
返回源。获取（0）；
}
}
我找到了另一种方法来做我想做的事：

首先，我将此插件添加到我的pom.xml中的builds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>

我还将此注释添加到我的spring配置类中：

@PropertySource("classpath:application.properties")

因此，现在我将依赖于环境的属性写入不同的属性文件（如“\u developer.properties”或“\u staging.properties”），当我使用maven构建项目时，它已复制到“application.properties”，我在PropertySourcesPlaceholder配置中使用它

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;
}

@PropertySource("classpath:application.properties")