在Spring Boot中接收到两个响应后，如何并行调用2个外部API并执行合并

@RestController
public class ApiController {

    @GetMapping("/merge")
    public ResponseEntity<String> mergeResponses() {
        CompletableFuture<String> response1 = CompletableFuture.supplyAsync(() -> callExternalApi1());
        CompletableFuture<String> response2 = CompletableFuture.supplyAsync(() -> callExternalApi2());

        CompletableFuture<Void> allFutures = CompletableFuture.allOf(response1, response2);

        try {
            allFutures.get(); // 等待所有CompletableFuture完成
        } catch (InterruptedException | ExecutionException e) {
            // 处理异常
        }

        String mergedResponse = mergeResponses(response1.join(), response2.join());

        return ResponseEntity.ok(mergedResponse);
    }

    private String callExternalApi1() {
        // 调用外部API1的逻辑
        return "Response from API 1";
    }

    private String callExternalApi2() {
        // 调用外部API2的逻辑
        return "Response from API 2";
    }

    private String mergeResponses(String response1, String response2) {
        // 合并两个API的响应
        return response1 + " " + response2;
    }
}