AWS EventBridge Java SDK 2 默认行为是将没有总线名称的事件投放到默认总线上。可以使用PutEventsRequestEntry的source字段来指定事件的总线名称。

代码示例：

import software.amazon.awssdk.services.eventbridge.EventBridgeClient;
import software.amazon.awssdk.services.eventbridge.model.PutEventsRequest;
import software.amazon.awssdk.services.eventbridge.model.PutEventsRequestEntry;
import software.amazon.awssdk.services.eventbridge.model.PutEventsResponse;

public class Main {
    public static void main(String[] args) {
        // 创建EventBridge客户端对象
        EventBridgeClient eventBridgeClient = EventBridgeClient.create();

        // 创建事件请求对象
        PutEventsRequest putEventsRequest = PutEventsRequest.builder()
                .entries(PutEventsRequestEntry.builder()
                        .source("my-bus") // 设置事件的总线名称
                        .detail("{ \"key\": \"value\" }") // 设置事件的详细信息
                        .detailType("my-detail-type") // 设置事件的详细类型
                        .build())
                .build();

        // 投放事件
        PutEventsResponse putEventsResponse = eventBridgeClient.putEvents(putEventsRequest);
        System.out.println("Put events response: " + putEventsResponse);
    }
}