java如何从引导中获取值。来自静态实例的yml文件

Question

• 我有一个类宇宙连接和供应商响应速度
• 我从供应商响应Feed中调用了宇宙连接的方法
• 我调用的SupplierGetResponseFeed方法是静态的
• 例如：public static SupplierResponseDataEntity prepareSupplierAzureData(Map<String, Object> row, String[] columnNames) {
• 因此，当我在SupplierGetResponseFeed中创建宇宙连接的对象时，我不能使用@Autowired作为无法从引导中选取值的原因。宇宙连接中的yml文件

• 虽然我在SupplierGetResponseFeed中使用@Autowired创建对象，但我无法从引导中选择值

  @自动连线 静态宇宙连接宇宙

以下是供应商响应Feed的代码

public class SupplierGetResponseFeed {
static CosmosConnection cosmos= new CosmosConnection(); //creating object 
public static SupplierResponseDataEntity prepareSupplierAzureData(Map<String, Object> row, String[] columnNames) {
//Some code 
cosmos.connectToDB(); //calling the method of CosmosConnection class
} 

宇宙连接的代码是CosmosConnection

@Configuration
@ComponentScan
public class CosmosConnection {
    @Value("${cosmos.connectionuri}") private String uri;
    @Value("${cosmos.primarykey}") private String primarykey;

public String connectToDB() throws DocumentClientException, IOException, ParseException {
    System.out.println("URI is " + uri); //getting this as null

我需要做哪些更改来从引导中选取值。yml

Answer 1

javax包中名为PostConstruct的注释。使用spring框架的注释可以解决这个问题。如源代码中所述：

The PostConstruct annotation is used on a method that needs to be executed
 after dependency injection is done to perform any initialization

下面的代码就是一个例子：

@Configuration
public class ComosConfig {
  @Value("${cosmos.connectionuri}") private String uri;
  @Value("${cosmos.primarykey}") private String primarykey;

  //get and set methods here
}

public class CosmosConnection {
  private String uri;
  private String primaryKey;

  public CosmosConnection(String uri, String primaryKey) {
    this.uri = uri;
    this.primaryKey = primaryKey;
  } 

  public String connectToDB() {
    //do something here
  }
}

@Component
public class SupplierGetResponseFeed {
  private static CosmosConnection cosmos;
  private CosmosConfig config;

  public SupplierGetResponseFeed(CosmosConfig config) {
    this.config = config;
  }

  @PostConstruct
  public void init() {
    String uri = config.getUri();
    String primaryKey = config.getprimaryKey(); 
    cosmos = new cosmos(uri, primaryKey);
  }

  public static SupplierResponseDataEntity prepareSupplierAzureData() {
    cosmos.connectToDB(); //calling the method of CosmosConnection class
  }
} 

毕竟，考虑到代码分析UTIL，不建议从实例方法写入静态，因此您可能需要抑制与init方法一起使用的警告注释来消除警告