Question

Java如何通过URL调用远程接口并读取返回信

Answer 1

下面代码可供你参考：
String ticket = "";//登录凭证
String url_str = "http://www.sina.com.cn?ticket=";//获取用户认证的帐号URL
String ticket_url = url_str + ticket;
URL url = new URL(ticket_url);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();

connection.connect();
int code = connection.getResponseCode();
if (code == 404) {

throw new Exception("认证无效，找不到此次认证的会话信息！");
}
if (code == 500) {
throw new Exception("认证服务器发生内部错误！");
}
if (code != 200) {
throw new Exception("发生其它错误，认证服务器返回 " + code);
}
InputStream is = connection.getInputStream();
byte[] response = new byte[is.available()];
is.read(response);
is.close();
if (response == null || response.length == 0) {
throw new Exception("认证无效，找不到此次认证的会话信息！");
}
String userId = new String(response, "GBK");
System.out.println(userId);