spring使用RestTemplate来调用其他接口

在开发中，有的时候我们得调用别人提供的接口API，在这里介绍使用RestTemplate的方式来调用别人的API，简单方便

为了方便将数据转化为json 格式，在这里我引入了fastjson

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.28</version>
</dependency>

好了，准备工作做好了，现在就开始吧

附上相关代码

1、先编写RestTemlateConfig，配置好相关信息

/**
 * Created by hongzhenyue on 18/3/1.
 */
@Configuration
public class RestTemplateConfig {
    @Bean
    public RestTemplate restTemplate(ClientHttpRequestFactory factory){
        return new RestTemplate(factory);
    }

    @Bean
    public ClientHttpRequestFactory simpleClientHttpRequestFactory(){
        SimpleClientHttpRequestFactory factory=new SimpleClientHttpRequestFactory();
        factory.setConnectTimeout(15000);
        factory.setReadTimeout(5000);
        return factory;
    }
}

2、然后就可以编写controller了，写了testGetAction 和 testPostAction 这两天API来模拟第三方的API

import com.alibaba.fastjson.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;

/**
 * call API
 * Created by hongzhenyue on 18/3/1.
 */
@RestController
public class SpringRestTemplateController {
    @Autowired
    private RestTemplate restTemplate;

    /***********HTTP GET method*************/
    @GetMapping("/testGetAction")
    public Object getJson() {
        JSONObject json = new JSONObject();
        json.put("username", "tester");
        json.put("pwd", "123456748");
        return json;
    }

    @GetMapping("/getApi")
    public String testGet() {
        String url = "http://localhost:8088/demo/testGetAction";
        JSONObject json = restTemplate.getForEntity(url, JSONObject.class).getBody();
        return json.toJSONString();
    }

    /**********HTTP POST method**************/
    @PostMapping(value = "/testPostAction")
    public Object postJson(@RequestBody JSONObject param) {
        System.out.println(param.toJSONString());
        param.put("action", "post");
        param.put("username", "tester");
        param.put("pwd", "123456748");
        return param;
    }

    @PostMapping(value = "/postApi")
    public Object testPost() {
        String url = "http://localhost:8088/demo/testPostAction";
        JSONObject postData = new JSONObject();
        postData.put("descp", "request for post");
        JSONObject json = restTemplate.postForEntity(url, postData, JSONObject.class).getBody();
        return json.toJSONString();
    }
}

然后在postman上调用getApi，然后查看结果

{"pwd":"123456748","username":"tester"}

在postman上post 请求 postApi，查看结果

{"action":"post","pwd":"123456748","descp":"request for post","username":"tester"}

由此可见，我们已经成功得调用到了其他的API