httpClientUtil的post請求

post請求的寫法，帶請求頭和請求體：

代碼：

import org.apache.http.HttpEntity;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.springframework.stereotype.Component;

import java.io.IOException;
import java.util.Map;

@Component
public class HttpRequestPostServiceImpl implements HttpRequestPostService {
    CloseableHttpClient httpClient = HttpClients.createDefault();

    @Override
    public String doPostHttpRequest(String url, Map<String, String> headerMap, String requestBody) {
        String entityStr = null;
        CloseableHttpResponse response = null;
        try {
            HttpPost post = new HttpPost(url);
            //添加頭部信息
            for (Map.Entry<String, String> header : headerMap.entrySet()) {
                post.addHeader(header.getKey(), header.getValue());
            }
            HttpEntity entity = new StringEntity(requestBody, "Utf-8");
            System.out.println("請求體是：" + requestBody);
            post.setEntity(entity);
            response = httpClient.execute(post);
            // 獲得響應的實體對象
            HttpEntity httpEntity = response.getEntity();
            // 使用Apache提供的工具類進行轉換成字符串
            entityStr = EntityUtils.toString(httpEntity, "UTF-8");
            System.out.println("POST請求路徑：" + post);
            System.out.println("POST請求結果：" + entityStr);
        } catch (ClientProtocolException e) {
            System.err.println("Http協議出現問題");
            e.printStackTrace();
        } catch (ParseException e) {
            System.err.println("解析錯誤");
            e.printStackTrace();
        } catch (IOException e) {
            System.err.println("IO異常");
            e.printStackTrace();
        }
        return entityStr;
    }
}