[英]How can I pass properties placeholder to annotations from YAML config file?
I want to pass my config properties from YAML file to annotations value like this: @SendTo(value = "${config.ws.topic}")
, but get an error 我想将配置属性从YAML文件传递给注释值,例如:
@SendTo(value = "${config.ws.topic}")
,但出现错误
Could not resolve placeholder config.ws.topic etc ..
无法解析占位符config.ws.topic等。
My Code: 我的代码:
@MessageMapping("/chat.register")
@SendTo("${config.websocket.topic}")
public Message addUser(@Payload Message message,
SimpMessageHeaderAccessor headerAccessor) {
headerAccessor.getSessionAttributes().put("username", message.getSender());
return message;
}
Prop-es file: 道具文件:
server:
address: 127.0.0.1
port: 8080
config:
websocket:
endpoint: /ns/ws/endpoint
appPrefix: /ns/ws
topic: /ns/ws/ns-topic
Props config class: 道具配置类:
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
@Configuration
@ConfigurationProperties(value = "config.websocket")
public class WebSocketConfigurationProperties {
private String endpoint;
private String appPrefix;
private String topic;
public String getEndpoint() {
return endpoint;
}
public void setEndpoint(String endpoint) {
this.endpoint = endpoint;
}
public String getAppPrefix() {
return appPrefix;
}
public void setAppPrefix(String appPrefix) {
this.appPrefix = appPrefix;
}
public String getTopic() {
return topic;
}
public void setTopic(String topic) {
this.topic = topic;
}
}
Could you please advise me on how to pass the config properties to annotations @SendTo
? 您能建议我如何将配置属性传递给注释
@SendTo
吗?
If you are trying to map values from application.yml to your configuration class you can simply make use of @Value
for this purpose. 如果您尝试将值从application.yml映射到配置类,则可以简单地使用
@Value
来实现此目的。
In your controller simply create variables which will hold the information from application.yml
like as specified below 在您的控制器中,只需创建变量即可保存来自
application.yml
的信息,如下所示
@Value("${config.ws.topic}")
String topic;
and your controller will look as below 您的控制器将如下所示
@MessageMapping("/chat.register")
@SendTo(topic)
public Message addUser(@Payload Message message,
SimpMessageHeaderAccessor headerAccessor) {
headerAccessor.getSessionAttributes().put("username", message.getSender());
return message;
}
Edit 1: Due to the following error Attribute value must be constant , there is a work around to solve the issue. 编辑1:由于以下错误, 属性值必须恒定 ,可以解决此问题。
@Value("${config.ws.topic}")
String topic;
public static final String TOPIC_VALUE = "" + topic;
and your controller will look as below 您的控制器将如下所示
@MessageMapping("/chat.register")
@SendTo(TOPIC_VALUE)
public Message addUser(@Payload Message message,
SimpMessageHeaderAccessor headerAccessor) {
headerAccessor.getSessionAttributes().put("username", message.getSender());
return message;
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