動態(tài)配置簡單說明

替代本地項目application.properties或者application.yml

• 定義開關(guān)

/**
 * 
 * @author hejian
 *
 */
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Import(TestPropertyPlaceholderConfigurer.class)
public @interface EnableDisConfig {

}

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2.PropertySourcesPlaceholderConfigurer
提供配置解析功能,模擬遠(yuǎn)程拉取配置

/**
 * 
 * @author hejian
 *
 */
public class TestPropertyPlaceholderConfigurer extends PropertySourcesPlaceholderConfigurer implements Ordered  {
    
    @Override
    protected void loadProperties(Properties props) throws IOException {
        // 遠(yuǎn)程配置中心拉取當(dāng)前應(yīng)用的所有配置項，構(gòu)建成Properties對象痪伦，委托spring進(jìn)行解析占位符${""}
        props.put("name", "test");
        System.out.println("in success");
        super.setLocalOverride(true);
        super.loadProperties(props);
    }
    
    @Override
    public int getOrder() {
        return -1;
    }
}

• 熱更新
  動態(tài)通知應(yīng)用變更k-v,獲取spring容器對象饵骨，處理@value注解，重新賦值

        /**
         * 動態(tài)通知應(yīng)用變更k-v,獲取spring容器對象，處理@value注解激率，重新賦值
         */
        String[] beans = applicationContext.getBeanDefinitionNames();
        Assert.noNullElements(beans,"無實例化bean對象");
        for (String beanName : beans) {
            Class<?> bean = applicationContext.getType(beanName);
            
            ReflectionUtils.doWithFields(bean, new FieldCallback() {

                @Override
                public void doWith(Field field) throws IllegalArgumentException, IllegalAccessException {
                    System.out.println("BeanName:" + beanName);
                    System.out.println("Bean的類型：" + bean);
                    System.out.println("Bean所在的包：" + bean.getPackage());
                    System.out.println(">>>>>>>" + field.getName());
                    ReflectionUtils.makeAccessible(field);
                    ReflectionUtils.setField(field, applicationContext.getBean(beanName), value);
                }
            }, new FieldFilter() {
                @Override
                public boolean matches(Field field) {
                    return field.isAnnotationPresent(Value.class) && key.equals(StringResolver.getValue(field.getAnnotation(Value.class).value()));
                }
            });
        }
    }

• 測試結(jié)果
  OK

/**
 * 
 * @author hejian
 *
 */
@Component
public class TestManage {
    
   @Autowired
    private Environment env;
    
    @Value("${name}")
    private String name; 
    
    
    @PostConstruct
    public String getName() {
        System.out.println(env.getProperty("test.msg"));
        System.out.println(env.getProperty("server.port"));
        return name;
    }
}

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