SpringBoot发送http请求

HttpUtils工具类如下

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestTemplate;

import java.util.Map;


@Component
public class HttpUtils {

    @Autowired
    private RestTemplate restTemplate;

    public HttpEntity> generatePostJson(Map jsonMap) {

        HttpHeaders httpHeaders = new HttpHeaders();

        MediaType type = MediaType.parseMediaType("application/json;charset=UTF-8");

        httpHeaders.setContentType(type);

        HttpEntity> httpEntity = new HttpEntity<>(jsonMap, httpHeaders);

        return httpEntity;
    }


    public String generateRequestParameters(String protocol, String uri, Map params) {
        StringBuilder sb = new StringBuilder(protocol).append("://").append(uri);
        sb.append("?");
        for (Map.Entry map : params.entrySet()) {
            sb.append(map.getKey())
                    .append("=")
                    .append(map.getValue())
                    .append("&");
        }
        uri = sb.substring(0, sb.length() - 1);
        return uri;
    }

    /**
     * get请求、请求参数为?拼接形式的
     * 

     * 最终请求的URI如下：
     * 

     * http://127.0.0.1:80/?name=张三&age=20
     *
     * @return
     */
    public String get(String url, Map map) {

        ResponseEntity responseEntity = restTemplate.getForEntity
                (
                        generateRequestParameters("http", url, map),
                        String.class
                );
        return (String) responseEntity.getBody();
    }
    
    public String post(String url, Map jsonMap) {
        ResponseEntity apiResponse = restTemplate.postForEntity
                (
                        url,
                        jsonMap,
                        String.class
                );
        return apiResponse.getBody();
    }

}

此外，需要定义一个RestTemplate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;

@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);
		factory.setConnectTimeout(15000);
		return factory;
	}

}

测试Controller

    @GetMapping("test")
    public String test(){
        String url = "192.168.52.117:8081/books/1/10";
        HashMap param = new HashMap();
        param.put("type","测试");
        String books = httpUtils.get(url,param);
        System.out.println(books);
        return books;
    }

    @GetMapping("testPost")
    public String testPost(){
        String url = "http://192.168.52.117:8081/books/save";
        HashMap param = new HashMap();
        param.put("type","测试2");
        param.put("name","软件测试");
        String books = httpUtils.post(url,param);
        System.out.println(books);
        return books;
    }