java如何调用对方http接口 新手虚心求教

/**
* 程序中访问http数据接口
*/
public static String getURLContent(String urlStr) {
/** 网络的url地址 */
URL url = null;
/** http连接 */
HttpURLConnection httpConn = null;
/**//** 输入流 */
BufferedReader in = null;
StringBuffer sb = new StringBuffer();
try {
url = new URL(urlStr);
in = new BufferedReader(new InputStreamReader(url.openStream(), "GBK"));
String str = null;
while ((str = in.readLine()) != null) {
sb.append(str);
}
} catch (Exception ex) {

} finally {
try {
if (in != null) {
in.close();
}
} catch (IOException ex) {
}
}
String result = sb.toString();
System.out.println(result);
return result;
}