Java发送http请求接口-RestTemplate

Spring-发送Http请求-RestTemplate

RestTemplate是由Spring用于同步client端的核心类，简化了与http服务的通信，统一了RESTFul的标准，封装了http连接，我们只需要传入url及其返回值类型即可。相较于之前常用的HttpClient，RestTemplate是一种更为优雅的调用RESTFul服务的方式。

1.Maven引入

pom.xml配置项

<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-web</artifactId>
	<version>5.3.22</version>
</dependency>

2.代码展示

发送请求工具类

import com.alibaba.fastjson.JSONObject;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;

import javax.annotation.PostConstruct;

public class HttpUtil {
    
    
    RestTemplate restTemplate = null;

    @PostConstruct
    public void before() {
    
    
        HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
        //设置连接超时时间
        requestFactory.setConnectTimeout(10000);
        //设置读取超时时间
        requestFactory.setReadTimeout(10000);
        restTemplate = new RestTemplate(requestFactory);
    }


 	//post请求
    public JSONObject doPostForm(String urlPath, Map<String,String> body) {
    
    
        //  一定要设置header
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);
        HttpEntity<?> request = new HttpEntity<Object>(bodyObject, headers);
        ResponseEntity<String> entity = restTemplate.postForEntity(urlPath, request, String.class);
        return JSONObject.parseObject(entity.getBody());
    }
    
	//Get请求
    public String doGetString(String urlPath) {
    
    
        HttpHeaders headers = new HttpHeaders();
        HttpEntity<String> entity = new HttpEntity<>(headers);
        ResponseEntity<String> exchange = restTemplate.exchange(urlPath, HttpMethod.GET, entity, String.class);
        return exchange.getBody();
    }

}