import org.apache.logging.log4j.LogManager;

import org.apache.logging.log4j.Logger;

import org.springframework.http.HttpEntity;

import org.springframework.http.HttpHeaders;

import org.springframework.http.MediaType;

import org.springframework.http.client.SimpleClientHttpRequestFactory;

import org.springframework.web.client.RestTemplate;

import java.io.UnsupportedEncodingException;

public class RestTemplateUtil {

    private static Logger logger = LogManager.getLogger(RestTemplateUtil.class);

    public String post(String reqParam, String url) {

        // 核心返回结果报文字符串

        String returnJson = "";

        try {

            //复杂构造函数的使用

            SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();

            requestFactory.setConnectTimeout(1000);// 设置超时

            requestFactory.setReadTimeout(1000);

            //利用复杂构造器可以实现超时设置，内部实际实现为 HttpClient

            RestTemplate restTemplate = new RestTemplate(requestFactory);

            //设置HTTP请求头信息，实现编码等

            HttpHeaders headers = new HttpHeaders();

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

            headers.setContentType(type);

            headers.add("Accept", MediaType.APPLICATION_JSON.toString());

            //利用容器实现数据封装，发送

            HttpEntity<String> entity = new HttpEntity<String>(reqParam, headers);

            returnJson = restTemplate.postForObject(url, entity, String.class);

            // 转码原因：RestTemplate默认是使用org.springframework.http.converter.StringHttpMessageConverter来解析

            // StringHttpMessageConverter 默认用的 ISO-8859-1来编码的

            returnJson = new String(returnJson.getBytes("ISO-8859-1"), "utf-8");

        } catch (UnsupportedEncodingException e) {

            e.printStackTrace();

            logger.info("----------------------------------------");

            logger.info(returnJson);

            logger.info("----------------------------------------");

        }return returnJson;

    }

}