Spring Boot项目无法触发RestTemplate调用问题求助

Hey there! Let's break down what might be going on here and get your REST calls working. Since you're new to Spring Boot and REST, I'll walk you through the most common checks first:

Your Spring Boot app is running on port 8080, so you need to send requests to your local app's endpoints, not directly to the Mock server. That means:

• Visit http://localhost:8080/myapp or http://localhost:8080/newApp in your browser/Postman, not the Mock URL.
• This is a super common mix-up for new devs—your controller methods are supposed to act as a middleman that calls the Mock server, so you have to trigger them first.

Double-check these key annotations in MyRestController:

• The class must have @RestController (not just @Controller) so Spring recognizes it as an HTTP request handler.
• Each endpoint method needs a mapping annotation like @GetMapping("/myapp") to tie the URL to your code.

Example of a correctly structured controller:

@RestController
public class MyRestController {
    private final RestTemplate restTemplate;

    // Use constructor injection (best practice instead of @Autowired on fields)
    public MyRestController(RestTemplate restTemplate) {
        this.restTemplate = restTemplate;
    }

    @GetMapping("/myapp")
    public String triggerMockCalls() {
        System.out.println("WOWOWOW"); // This should print first if the endpoint is hit
        // Your loop to call the Mock server
        for (int i = 0; i < 3; i++) {
            String mockResponse = restTemplate.getForObject(
                "https://c3f837c7-3088-4165-a4f3-ad11b24c41f1.mock.pstmn.io/myapp",
                String.class
            );
            System.out.println("Mock response #" + i + ": " + mockResponse);
        }
        return "Calls completed!";
    }
}

In Lab3Application, make sure you've declared the RestTemplate as a Spring-managed Bean with the @Bean annotation:

@SpringBootApplication
public class Lab3Application {
    public static void main(String[] args) {
        SpringApplication.run(Lab3Application.class, args);
    }

    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

If this Bean is missing, Spring won't be able to inject it into your controller, and you'd see an error in the console. But since your app started, double-check this anyway to be safe.

If you're using MyCallable for async logic:

• Make sure the class has @Component so Spring picks it up as a Bean.
• Ensure you're actually calling its call() method from your controller (it won't run automatically).
• If you want async execution, add @EnableAsync to your Lab3Application class.

Example of a working MyCallable setup:

@Component
public class MyCallable implements Callable<String> {
    private final RestTemplate restTemplate;

    public MyCallable(RestTemplate restTemplate) {
        this.restTemplate = restTemplate;
    }

    @Override
    public String call() throws Exception {
        System.out.println("Inside MyCallable's call method");
        return restTemplate.getForObject(
            "https://c3f837c7-3088-4165-a4f3-ad11b24c41f1.mock.pstmn.io/myapp",
            String.class
        );
    }
}

// In your controller
@GetMapping("/newApp")
public String useCallable() throws Exception {
    System.out.println("Triggering MyCallable...");
    String result = myCallable.call();
    return "Callable result: " + result;
}

Sometimes requests fail silently because exceptions are caught by Spring. Enable debug logging to see what's happening:
Add these lines to src/main/resources/application.properties:

logging.level.org.springframework.web=DEBUG
logging.level.your.package.name=DEBUG # Replace with your actual project package

This will show you if Spring is mapping your endpoints correctly, if requests are reaching your controller, and if there are any errors with the RestTemplate call.

First, test the Mock URL directly in your browser/Postman to confirm it returns {"status": "ok"}. If the Mock server is down or unresponsive, your RestTemplate call will throw an exception (which might skip your System.out if it happens before the print statement).

Start with these checks—9 times out of 10, the issue is a missing annotation, hitting the wrong URL, or a misconfigured Bean. Let me know what you find!

内容的提问来源于stack exchange，提问作者quikq