spring消费RESTfull服务

使用RestTemplate做这件事非常简单

package hello;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
public class Application implements CommandLineRunner {

    private static final Logger log = LoggerFactory.getLogger(Application.class);

    public static void main(String args[]) {
        SpringApplication.run(Application.class);
    }

    @Override
    public void run(String... args) throws Exception {
        RestTemplate restTemplate = new RestTemplate();
        Quote quote = restTemplate.getForObject("http://gturnquist-quoters.cfapps.io/api/random", Quote.class);
        log.info(quote.toString());
    }
}

在日常的工作中我们返回的结果通常是一个Wrapper，含有一个泛型属性来表示真正的业务对象。这就要用到ParameterizedTypeReference

代码就成了这样了

@Override
    public void run(String... args) throws Exception {
        RestTemplate restTemplate = new RestTemplate();
        ResponseWrapper<Quote> quote = restTemplate.exchange("http://gturnquist-quoters.cfapps.io/api/random", HttpMethod.GET, null, new ParameterizedTypeReference<ResponseWrapper<Quote>>() {});
        log.info(quote.toString());
    }