http工具类

@Slf4j
public class HttpUtil {

    public static String sendGet(String url, String param, Map<String, String> header) {
        StringBuilder result = new StringBuilder();
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            //设置超时时间
            connection.setConnectTimeout(5000);
            connection.setReadTimeout(15000);
            // 设置通用的请求属性
            if (header != null) {
                Iterator<Entry<String, String>> it = header.entrySet().iterator();
                while (it.hasNext()) {
                    Entry<String, String> entry = it.next();
                    connection.setRequestProperty(entry.getKey(), entry.getValue());
                }
            }
            // 建立实际的连接
            connection.connect();
            // 定义 BufferedReader输入流来读取URL的响应，设置utf8防止中文乱码
            in = new BufferedReader(new InputStreamReader(connection.getInputStream(), StandardCharsets.UTF_8));
            String line;
            while ((line = in.readLine()) != null) {
                result.append(line);
            }
        } catch (Exception e) {
            log.error("{} GET请求调用发生异常：{}", url, e.getMessage(), e);
        } finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        log.info("{} 请求返回值为：{}", url, result.toString());
        return result.toString();
    }

    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        StringBuilder result = new StringBuilder();
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            //设置超时时间
            conn.setConnectTimeout(5000);
            conn.setReadTimeout(15000);
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(), StandardCharsets.UTF_8));
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8));
            String line;
            while ((line = in.readLine()) != null) {
                result.append(line);
            }
        } catch (Exception e) {
            log.error("{} POST请求调用发生异常：{}", url, e.getMessage(), e);
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        log.info("{} 请求返回值为：{}", url, result.toString());
        return result.toString();
    }

}