java 发送http消息 带参数 HttpURLConnection

代码

public static void main(String[] args) throws IOException {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = URLNAME + "?param1=123&param2=abc";
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的衔接
            HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
            // 设置通用的要求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 树立实际的衔接
            connection.connect();
            connection.setRequestMethod("POST");
            // 获得所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET要求涌现异常！" + e);
            e.printStackTrace();
        }
        // 应用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
       
        System.out.println("result:" + result);
    }public static void main(String[] args) throw