pf4j spring 插件配置处理

pf4j spring 提供的spring 能力有点弱，但是我们可以自己扩展实现spring 插件类似spring boot 的配置处理能力

问题

比如我们需要实现如下的配置，自定转换，但是因为默认的spring 项目是不直接支持此特性的

@Configuration

@PropertySource(name ="dalongdemo",value = "classpath:app.yaml")

public class MyConfigProperties {

    private   String name;

    private   int age;

    private String demoname;

 

    public String getDemoname() {

        return demoname;

    }

 

    public void setDemoname(String demoname) {

        this.demoname = demoname;

    }

 

    public String getName() {

        return name;

    }

 

    public void setName(String name) {

        this.name = name;

    }

 

    public int getAge() {

        return age;

    }

 

    public void setAge(int age) {

        this.age = age;

    }

 

    @Override

    public String toString() {

        return "MyConfigProperties{" +

                "name='" + name + '\'' +

                ", age=" + age +

                ", demoname='" + demoname + '\'' +

                '}';

    }

}

解决方法

可以在spring 插件的 createApplicationContext 中进行ConfigurationPropertiesBindingPostProcessor 注册，这样我们就能使用此功能了
参考

 

applicationContext.register(PluginCConfig.class,MyConfigProperties.class, ConfigurationPropertiesBindingPostProcessor.class);

yaml 格式prefix 问题

此问题就需要强制指定下

@EnableConfigurationProperties(MyConfigProperties.class)

同时还需要自定义一个prefix 处理的，比如基于yaml 的

public class YamlPropertySourceFactory implements PropertySourceFactory {

    @Override

    public PropertySource<?> createPropertySource(String name, EncodedResource encodedResource)

            throws IOException {

        YamlPropertiesFactoryBean factory = new YamlPropertiesFactoryBean();

        factory.setResources(encodedResource.getResource());

        Properties properties = factory.getObject();

        return new PropertiesPropertySource(encodedResource.getResource().getFilename(), properties);

    }

}

property 类

@ConfigurationProperties(prefix = "demoapp")

@Configuration

@PropertySource(name ="dalongdemo",value = "classpath:app.yaml",factory = YamlPropertySourceFactory.class)

public class MyConfigProperties {

    private   String name;

    private   int age;

    private String demoname;

 

    public String getDemoname() {

        return demoname;

    }

 

    public void setDemoname(String demoname) {

        this.demoname = demoname;

    }

 

    public String getName() {

        return name;

    }

 

    public void setName(String name) {

        this.name = name;

    }

 

    public int getAge() {

        return age;

    }

 

    public void setAge(int age) {

        this.age = age;

    }

 

    @Override

    public String toString() {

        return "MyConfigProperties{" +

                "name='" + name + '\'' +

                ", age=" + age +

                ", demoname='" + demoname + '\'' +

                '}';

    }

}

 

yaml 文件

demoapp:

   name: demo

   age: 333

参考资料

https://www.baeldung.com/spring-boot-testing-configurationproperties
https://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/context/properties/ConfigurationProperties.html
https://docs.spring.io/spring-boot/docs/2.1.13.RELEASE/reference/html/boot-features-external-config.html
https://github.com/rongfengliang/pf4j-spring-learning/tree/classloader-test