restTemplate工具類

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) {
        // 核心返回結果報文字符串
        String returnJson = "";

        try {
            //復雜構造函數的使用
            SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
            requestFactory.setConnectTimeout(1000);// 設置超時
            requestFactory.setReadTimeout(1000);

            //利用復雜構造器可以實現超時設置，內部實際實現為 HttpClient
            RestTemplate restTemplate = new RestTemplate(requestFactory);

            //設置HTTP請求頭信息，實現編碼等
            HttpHeaders headers = new HttpHeaders();
            MediaType type = MediaType.parseMediaType("application/json; charset=UTF-8");
            headers.setContentType(type);
            headers.add("Accept", MediaType.APPLICATION_JSON.toString());

            //利用容器實現數據封裝，發送
            HttpEntity<String> entity = new HttpEntity<String>(reqParam, headers);
            returnJson = restTemplate.postForObject(url, entity, String.class);

            // 轉碼原因：RestTemplate默認是使用org.springframework.http.converter.StringHttpMessageConverter來解析
            // StringHttpMessageConverter 默認用的 ISO-8859-1來編碼的
            returnJson = new String(returnJson.getBytes("ISO-8859-1"), "utf-8");

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            logger.info("----------------------------------------");
            logger.info(returnJson);
            logger.info("----------------------------------------");
        }return returnJson;
    }
}