HttpURLConnection 发送请求

public class HttpURLConnectionUtil {

        public static String sendHttpRequest(String httpUrl, Map<String, String> params) throws IOException {

            //1.建立URL连接对象
            URL url = new URL(httpUrl);
            //2.创建连接
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            //3.设置请求方式
            conn.setRequestMethod("POST");
            //是否需要输出
            conn.setDoOutput(true);
            if(!CollectionUtils.isEmpty(params)){
                //拼接参数
                StringBuilder sb = new StringBuilder();
                for(Map.Entry<String, String> param  : params.entrySet()){
                    sb.append("&").append(param.getKey()).append("=").append(param.getValue());
                }
                conn.getOutputStream().write(sb.substring(1).toString().getBytes("UTF-8"));
            }

            conn.connect();
            String responseStr = StreamUtils.copyToString(conn.getInputStream(), Charset.forName("UTF-8"));
            return responseStr;
        }

    public static void main(String[] args) throws IOException {

            Map<String, String> params = new HashMap<>();

        String str = HttpURLConnectionUtil.sendHttpRequest("",params);
        System.out.println(str);
    }

}

本文地址：https://blog.csdn.net/xiaoxiamiqianqian/article/details/110282861