来自配置的属性占位符

Question

使用Spring在xml上下文中,我们可以像这样简单地加载属性:

<context:property-placeholder location:"classpath*:app.properties"/>

有没有机会在没有样板的情况下在@Configuration bean(~java代码)中配置相同的属性？

谢谢!

Answer 1

您可以使用注释@PropertySource这样

@Configuration
@PropertySource(value="classpath*:app.properties")
public class AppConfig {
 @Autowired
 Environment env;

 @Bean
 public TestBean testBean() {
     TestBean testBean = new TestBean();
     testBean.setName(env.getProperty("testbean.name"));
     return testBean;
 }
}

请参阅:http://static.springsource.org/spring/docs/3.1.x/javadoc-api/org/springframework/context/annotation/PropertySource.html

编辑:如果您使用的是Spring引导,则可以使用@ConfigurationProperties注释将属性文件直接连接到bean属性,如下所示:

test.properties

name=John Doe
age=12

PersonProperties.java

@Component
@PropertySource("classpath:test.properties")
@ConfigurationProperties
public class GlobalProperties {

    private int age;
    private String name;

    //getters and setters
}

来源:https: //www.mkyong.com/spring-boot/spring-boot-configurationproperties-example/

Answer 2

手动配置可以通过以下代码完成

public static PropertySourcesPlaceholderConfigurer loadProperties(){
  PropertySourcesPlaceholderConfigurer propertySPC =
   new PropertySourcesPlaceholderConfigurer();
  Resource[] resources = new ClassPathResource[ ]
   { new ClassPathResource( "yourfilename.properties" ) };
  propertySPC .setLocations( resources );
  propertySPC .setIgnoreUnresolvablePlaceholders( true );
  return propertySPC ;
}

资料来源:物业占位符