如何从静态实例的 bootstrap.yml 文件中获取值

Question

• 我有一个类CosmosConnection和SupplierGetResponseFeed
• 我正在从SupplierGetResponseFeed调用CosmosConnection的方法
• 我从中调用CosmosConnection方法的SupplierGetResponseFeed方法是静态的
• 例 ：public static SupplierResponseDataEntity prepareSupplierAzureData(Map<String, Object> row, String[] columnNames) {
• 因此，当我在SupplierGetResponseFeed中创建CosmosConnection的对象时，我不能使用@Autowired作为我无法从CosmosConnection中的bootstrap.yml文件中选择值的原因

• 虽然我在SupplierGetResponseFeed中使用@Autowired创建对象，但我无法从引导程序中选取值

  @Autowired 静态宇宙连接宇宙;

以下是SupplierGetResponseFeed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
} 

的代码是宇宙连接

@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

我需要做哪些更改才能从 bootstrap.yml 中选择值？

Answer 1

带有spring 框架的 javax.annotation 包中名为 PostConstruct 的注解可用于解决问题。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

下面的代码是一个示例：

@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，鉴于代码分析实用程序，不建议从实例方法写入静态方法，因此您可能需要与 init 方法一起使用抑制警告注释来消除警告。