无法使用RestTemplate使用Rest API
[英]Unable to consume a rest api using resttemplate
问题描述
I have this api i am trying to consume and this is the link https://www.live-rates.com/api/price?key=123456&rate=EUR_USD 
我有我要使用的这个api，这是链接https://www.live-rates.com/api/price?key=123456&rate=EUR_USD
I have tried this in my controller 我已经在控制器中尝试过
@ResponseBody
@RequestMapping(value = { "/start" }, method = RequestMethod.GET)
public String start() {
RestTemplate restTemplate = new RestTemplate();
String quote = restTemplate.getForObject("https://www.live-rates.com/api/price?key=123456&rate=EUR_USD", String.class);
return quote.toString();
}
and this in my scheduling program 这在我的计划程序中
package com.boilerplate.components;
import java.util.Date;
import org.slf4j.Logger;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Async;
import com.boilerplate.services.MessageListenerService;
import java.util.Random;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.query.Query;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.client.RestTemplate;
@Repository
@Transactional
@Configuration
@EnableAsync
@EnableScheduling
public class Scheduler {
//Database read and update and delete
@Autowired
private RabbitTemplate rabbitTemplate;
private static final Logger LOGGER = org.slf4j.LoggerFactory.getLogger(MessageListenerService.class);
@Autowired
private SessionFactory sessionFactory;
@Async
@Scheduled(cron="*/60 * * * * *")
public void doSomething(){
RestTemplate restTemplate = new RestTemplate();
String quote = restTemplate.getForObject("https://www.live-rates.com/api/price?key=123456&rate=EUR_USD", String.class);
LOGGER.info(quote.toString());
}
}
and they all fail to get the exchange rate. 他们都无法获得汇率。
I get this error when using the scheduler 使用调度程序时出现此错误
SEVERE: Unexpected error occurred invoking async method 'public void com.boilerplate.components.Scheduler.doSomething()'.
and this when using the controller 这在使用控制器时
HTTP ERROR 500
Problem accessing /boilerplate/start.
Server ErrorCaused by:
org.springframework.web.util.NestedServletException: Request processing failed;
I have tried consuming other json apis like https://jsonplaceholder.typicode.com/posts/1 and i can get the json without any problem. 我已经尝试使用其他json API，例如https://jsonplaceholder.typicode.com/posts/1并且我可以毫无问题地获取json。
Why cant i get the exchange rate using the rest template. 为什么我无法使用其余模板获取汇率。
3 个解决方案
解决方案1
4 已采纳 2018-11-05 14:39:36
Did you try adding below code. 您是否尝试添加以下代码。 You are trying to invoke with HTTPS. 您正在尝试使用HTTPS进行调用。
CloseableHttpClient httpClient = HttpClients.custom().setSSLHostnameVerifier(new NoopHostnameVerifier()) .build(); HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory(); requestFactory.setHttpClient(httpClient); RestTemplate restTemplate = new RestTemplate(requestFactory); String quote = restTemplate.getForObject("https://www.live-rates.com/api/price?key=123456&rate=EUR_USD", String.class);
解决方案2
1 2018-11-05 14:19:04
You don't need to use @Async with your @Scheduled annotation. 您不需要将@Async与@Scheduled批注一起使用。 The scheduler will run on it's own thread anyways. 无论如何，调度程序将在其自己的线程上运行。 Of course, one or more running scheduler will run sequentially, but that can be change. 当然，一个或多个正在运行的调度程序将按顺序运行，但是可以更改。 For your case though, regarding the documentation, it seems that, you might have to provide your restTemplate via dependency injection. 但是对于您的情况，关于文档，似乎您可能必须通过依赖注入来提供restTemplate。 So, @Autowire could do the trick. 因此，@ @Autowire可以解决问题。 Documentation, section 27.4.2 . 文档，第27.4.2节 。
Notice that the methods to be scheduled must have void returns and must not expect any arguments.
So, removing the @Async and adding the dependency injection of restTemplate could do the trick. 因此，删除@Async并添加@Async的依赖项注入restTemplate可以解决问题。
In case you need to know how to run multiple schedulers in different threads, you could check this answer . 如果您需要了解如何在不同的线程中运行多个调度程序，可以检查此答案 。
解决方案3
0 2018-11-05 16:21:28
与原始问题无关，但是如果变量'quote'已经是'String'类型的，为什么需要在其上调用方法'toString（）'？
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