如何在yml中获取我的配置值-使用dropwizard（微服务）Jersey DI @Injection？

Question

这是我的代码段。

这是我的yml文件：

productionServer:
  host: production-server.amazonaws.com
  publicIp: xx.xx.xx.xx
  privateIp: xx.xx.xx.xx
  userName: xx.xx.xx.xx
  password: xx.xx.xx.xx
  remoteFilePath: fake/path/
  fileName: test.txt
  privateKey: private-public-key.ppk

server:
  applicationConnectors:
    - type: http
      port: 8080
    - type: https
      port: 8443
      keyStorePath: key.keystore
      keyStorePassword: password
      validateCerts: false
  adminConnectors:
    - type: http
      port: 8081
    - type: https
      port: 8444
      keyStorePath: key.keystore
      keyStorePassword: password
      validateCerts: false

MyConfiguration类：

import io.dropwizard.Configuration;

public class MyConfiguration extends Configuration{

    @NotNull
    @JsonProperty
    private ProductionServer productionServer;

    // getters

public class ProdctionServer{

      @NotEmpty
      @JsonProperty
      private host;

      @NotEmpty
      @JsonProperty
      private publicIp;

      // getters

应用类别：

import io.dropwizard.Application;

public class MyApplication extends Application<MyConfiguration> {

    public static void main(String[] args) throws Exception{
        new MysApplication().run(args);
    }

    @Override
    public String getName(){ return "micro-service"; }

    @Override
    public void initialize(Bootstrap<MyConfiguration> bootstrap){}

    @Override
    public void run(MyConfiguration conf, Environment environment ){
        final MyResource myResource = new MyResource();
        // health check

        // environment.healthChecks().register("template",healthCheck);

        System.out.println( "==> " + conf );
        System.out.println( "==> " + conf.getProductionServer() );

        // register
        environment.jersey().register( MyResource );

并且在运行该应用程序时：

我收到了如下日志：

==> MyConfiguration{server=DefaultServerFactory{applicationConnectors=[io.dropwizard.jetty.HttpConnectorFactory@623e088f, io.dropwizard.jetty.HttpsConnectorFactory@39fcbef6], adminConnectors=[io.dropwizard.jetty.HttpConnectorFactory@34f22f9d, io.dropwizard.jetty.HttpsConnectorFactory@77d67cf3], adminMaxThreads=64, adminMinThreads=1, applicationContextPath=/, adminContextPath=/}, logging=DefaultLoggingFactory{level=INFO, loggers={}, appenders=[io.dropwizard.logging.ConsoleAppenderFactory@663411de]}}
==> com.mycompany.myproject.model.ProductionServer@5b04476e

表示成功获得了Yaml的价值。但是我的问题是在MyConfiguration类的DI或依赖项注入期间。尽管对象MyConfiguration在我的服务中似乎不为空，但我无法获得ProductionServer的值。

这是我绑定MyService.class和MyConfiguration.class的依赖关系的代码片段

DependencyBinder.class

导入org.glassfish.hk2.utilities.binding.AbstractBinder;

公共类DependencyBinder扩展AbstractBinder {

@Override
protected void configure() {
    bind(MyConfiguration.class).to(MyConfiguration.class);
    bind(MyService.class).to(MyService.class);
}

MyService.class

public class MyService {

    @Inject
    MyConfiguration conf;

    public void invoke(){
        System.out.println( "=============================== " );
        System.out.println( "==> " + conf );
        System.out.println("==> " + conf.getProductionServer() );
    }

在调用方法invoke（）的过程中，我得到了如下记录：

=============================== 
==> MyConfiguration{server=DefaultServerFactory{applicationConnectors=[io.dropwizard.jetty.HttpConnectorFactory@34e82c4d], adminConnectors=[io.dropwizard.jetty.HttpConnectorFactory@19b70fbd], adminMaxThreads=64, adminMinThreads=1, applicationContextPath=/, adminContextPath=/}, logging=DefaultLoggingFactory{level=INFO, loggers={}, appenders=[io.dropwizard.logging.ConsoleAppenderFactory@543f81c9]}}
==> null

现在我的问题是在MyService.class中的MyConfiguration类的DI或依赖项注入期间。尽管对象MyConfiguration在我的服务中似乎不为空，但我无法获得ProductionServer的值。请给我一些解决方案？thnx。

Answer 1

问题是，使用此配置

bind(MyConfiguration.class).to(MyConfiguration.class);

HK2将创建一个新实例MyConfiguration。它不会与DW填充的实例相同。但是，您 可以 做的是使用DW创建的实例，只需在HK2配置中绑定该
实例 即可

public class MyApplication extends Application<MyConfiguration> {

    @Override
    public void run(final MyConfiguration config, Environment env) {
        env.jersey().register(new AbstractBinder() {
            @Override
            protected void configure() {
                bind(config).to(MyConfiguration.class);
            }
        });
    }
}