RestTemplate简介
Spring RestTemplate 是 Spring 提供的用于访问 Rest 服务的客户端，RestTemplate 提供了多种便捷访问远程Http服务的方法，能够大大提高客户端的编写效率，所以很多客户端比如 Android或者第三方服务商都是使用 RestTemplate 请求 restful 服务。
下面通过代码讲解下SpringBoot-RestTemplate实现调用第三方API的方法，内容如下所示：
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;
@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;
}
@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;
}
}
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