public class HttpUtils {    public static String getContent(String url, Map
     
       heads, String charset, String method) throws Exception {        URL httpUrl = new URL(url);        HttpURLConnection httpURLConnection = (HttpURLConnection) httpUrl.openConnection(); ;        // 设置报头        if (heads != null) {            for (Map.Entry entry : heads.entrySet()) {                httpURLConnection.setRequestProperty((String) entry.getKey(), (String) entry.getValue());            }        }        httpURLConnection.setRequestMethod(method);        httpURLConnection.setDoInput(true);        httpURLConnection.setInstanceFollowRedirects(true);        httpURLConnection.connect();// 握手        String result = "";        BufferedReader in = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream(), charset));        String line;        while ((line = in.readLine()) != null) {            result += line;        }        return result;    }    public static void main(String[] args) throws Exception {        String url = "";        String ret = HttpUtils.getContent(url, null, "utf-8", "POST");        System.out.println(ret);    }}