json接口远程调用

String content="";
try {
URL url = new URL(urlStr);
HttpURLConnection httpURLConnection = (HttpURLConnection) url
.openConnection(); //获取连接
httpURLConnection.setRequestMethod("GET"); //设置请求方法为POST, 也可以为GET
httpURLConnection.setDoOutput(true);
InputStream is = httpURLConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
while (br.read() != -1) {
sb.append(br.readLine());
}
content = new String(sb);
content = new String(content.getBytes("GB2312"), "ISO-8859-1");
br.close();
} catch (Exception e) {
throw new Exception("付款接口调用失败！");
}

// 以上为调用的远程接口，数据传输格式为JSON


JSONObject jsonObject = JSONObject.fromObject("{" + content);
String expenseCode = jsonObject.getString("expense_code");