SpringBoot-RestTemplate实现调用第三方API

1. RestTemplate的方式来调用别人的API，将数据转化为json 格式，引入了fastjson

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

2. 编写RestTemlateConfig，配置好相关信息

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;
 
@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;
    }
}

3.编写controller，调用第三方的API，浏览器模拟get请求，postman模拟post请求

import com.alibaba.fastjson.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.*;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
 
import java.util.Map;
 
@RestController
public class SpringRestTemplateController {
    @Autowired
    private RestTemplate restTemplate;
    /***********HTTP GET method*************/
    @GetMapping("/testGetApi")
    public String getJson(){
        String url="http://localhost:8089/o2o/getshopbyid?shopId=19";
        //String json =restTemplate.getForObject(url,Object.class);
        ResponseEntity<String> results = restTemplate.exchange(url, HttpMethod.GET, null, String.class);
        String json = results.getBody();
        return json;
    }
 
    /**********HTTP POST method**************/
    @PostMapping(value = "/testPost")
    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 = "/testPostApi")
    public Object testPost() {
        String url = "http://localhost:8081/girl/testPost";
        JSONObject postData = new JSONObject();
        postData.put("descp", "request for post");
        JSONObject json = restTemplate.postForEntity(url, postData, JSONObject.class).getBody();
        return json;
    }
}

4、另一个项目接收json代码

/**
 * 接收传递的json参数解析*/
@RequestMapping("/getJson")
public String getJson(HttpServletRequest request,
        HttpServletResponse response) {
    StringBuffer json = new StringBuffer();
    String line = null;
    try {
        BufferedReader reader = request.getReader();
        while ((line = reader.readLine()) != null) {
            System.out.println("line:" + line);
            json.append(line);
        }
    } catch (Exception e) {
        System.out.println(e.toString());
 
    }
    System.out.println(json.toString());
    return json.toString();
}

参考：https://blog.csdn.net/a1032818891/article/details/81172478 

https://blog.csdn.net/Smilelfq/article/details/99977318