java - 在 Spring Boot 中使用 spring.application.json 作为 application.properties 文件

Question

我正在尝试使用 spring 文档中的命令 -Dspring.application.json='{"foo":{"bar":"spam"}}' 但在看到它时IntelliJ 的运行命令总是失败，并显示 无法解析占位符

我尝试使用系统变量和 Java Ops 变量，但没有成功。

我的代码如下:应用程序属性:

testing=${foo.bar}

应用程序.java

@SpringBootApplication
@ComponentScan
public class Application extends RepositoryRestMvcConfiguration {

    @Value("${testing:}")
    private String input;

    public static void main(final String args[]) {
        SpringApplication.run(Application.class, args);
    }

    @Bean
    public BatchDetails set() {
        System.out.println("input: " + input);
        return new BatchDetails("Test", "Test2");
    }
}

IntelliJ 虚拟机选项:-Dspring.application.json='{"foo":{"bar":"spam"}}'

IntelliJ 环境变量:SPRING_APPLICATION_JSON = '{"foo":{"bar":"spam"}}'

在应用程序启动时，我得到以下堆栈跟踪:

Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'foo.bar' in string value "${foo.bar}"
at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:174) ~[spring-core-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126) ~[spring-core-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:204) ~[spring-core-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:178) ~[spring-core-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.core.env.AbstractPropertyResolver.resolveNestedPlaceholders(AbstractPropertyResolver.java:195) ~[spring-core-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:87) ~[spring-core-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:60) ~[spring-core-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.core.env.AbstractEnvironment.getProperty(AbstractEnvironment.java:531) ~[spring-core-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.context.support.PropertySourcesPlaceholderConfigurer$1.getProperty(PropertySourcesPlaceholderConfigurer.java:132) ~[spring-context-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.context.support.PropertySourcesPlaceholderConfigurer$1.getProperty(PropertySourcesPlaceholderConfigurer.java:129) ~[spring-context-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:84) ~[spring-core-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.core.env.PropertySourcesPropertyResolver.getPropertyAsRawString(PropertySourcesPropertyResolver.java:70) ~[spring-core-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.core.env.AbstractPropertyResolver$1.resolvePlaceholder(AbstractPropertyResolver.java:207) ~[spring-core-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:153) ~[spring-core-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126) ~[spring-core-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:204) ~[spring-core-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:178) ~[spring-core-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.context.support.PropertySourcesPlaceholderConfigurer$2.resolveStringValue(PropertySourcesPlaceholderConfigurer.java:172) ~[spring-context-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:808) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1027) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:545) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
... 80 common frames omitted

我只是将配置放在错误的位置才能使其正常工作吗？

Answer 1

你不能像这样“扩展”Spring的application.properties。那里的所有值和系统级 spring.application.json 都会加载到您的 Environment 变量中，您可以访问 foo.bar从那里开始。

所以，基本上..

Spring 从您的 application.properties 中获取 testing，期望得到一个完全形成的值，然后从您的系统变量中获取 JSON，期望一个完全形成的值并将它们合并到环境中。

现在你可以做

@Autowired
private Environment env;

env.getProperty("testing");
env.getProperty("foo.bar");

//OR
@Value(${"foo.bar"})
private String valueFromFooBar