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spring web 项目提供的RestTemplate,使java访问url更方便,更优雅。
它是spring提供的异步的客户端http访问的核心class,它提供非常简单的RESTful方式与http server端进行数据交互,根据所提动的URLs进行http访问,并处理返回结果。它是基于JDK HTTP connection建立的。因此他可以使用不同的HTTP库(apache,netty and OkHttp)来setRequestFactory。
它实现了以下6个主要的HTTP meshod:
HTTP method | RestTemplate methods |
---|---|
DELETE | delete |
GET | getForObject,getForEntity |
HEAD | headForHeaders |
OPTIONS | optionsForAllow |
PUT | put |
any | exchange,execute |
现简单介绍在Springboot中使用RestTemplate
首先在代码中加入RestTemplate的配置类
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;
/**
* Created by liuxu on 2017/12/22.
* RestTemplate配置类
*/
@Configuration
public class RestTemplateConfig {
@Bean
public RestTemplate restTemplate(ClientHttpRequestFactory factory){
return new RestTemplate(factory);
}
@Bean
public ClientHttpRequestFactory simpleClientHttpRequestFactory(){
SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
factory.setReadTimeout(5000);//单位为ms
factory.setConnectTimeout(5000);//单位为ms
return factory;
}
}
然后在需要访问url的类中注入RestTemplate
@Autowired
private RestTemplate restTemplate;
使用RestTemplate发送get请求
//get json数据
JSONObject json = restTemplate.getForEntity(url, JSONObject.class).getBody();
使用RestTemplate发送post请求
//post json数据 JSONObject postData = new JSONObject(); postData.put("data", "request for post"); JSONObject json = restTemplate.postForEntity(url, postData, JSONObject.class).getBody(); //对基本类型的解析 JSONObject obj =
json
;
System.out.println("name:" + obj.getString("name")); System.out.println("sex:" + obj.getString("sex")); System.out.println("age" + obj.getInt("age")); System.out.println("is_student" + obj.getBoolean("is_student")); //对数组的解析 JSONArray hobbies = obj.getJSONArray("hobbies"); System.out.println("hobbies:"); for (int i = 0; i < hobbies.length(); i++) { String s = (String) hobbies.get(i); System.out.println(s); }
设置请求头
//post json string data
//return string
HttpHeaders headers = new HttpHeaders();
MediaType type = MediaType.parseMediaType("application/json; charset=UTF-8");
headers.setContentType(type);
headers.add("Accept", MediaType.APPLICATION_JSON.toString());
JSONObject jsonObj = JSONObject.parseObject(paras);
HttpEntity<String> formEntity = new HttpEntity<String>(jsonObj.toString(), headers);
String result = restTemplate.postForObject(url, formEntity, String.class);
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原文地址:https://www.cnblogs.com/scode2/p/8776387.html
时间: 2024-10-19 13:02:52