[英]BufferedReader UTF-8 BOM
我在Java中有一个方法,尝试通过POST json请求获取一个整数(用户ID),这是该方法:
public static Integer getUserIdOwnerOfMsg(Message msg) {
Integer idUser = null;
try {
JSONObject jsonObject = new JSONObject();
jsonObject.put("textMsg", msg.getTextMsg());
jsonObject.put("hourMsg", msg.getHourMsg());
List list = new LinkedList();
list.addAll(Arrays.asList(jsonObject));
String jsonString = list.toString();
String urlStr = SERVER_PATH + "getUserIdOwnerOfMsgJSON.php";
URL url = new URL(urlStr);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("POST");
con.setRequestProperty("User-Agent", "your user agent");
con.setRequestProperty("Accept-Language", "sp,SP;q=0.5");
//con.setRequestProperty("Content-Type", "text/html; charset=UTF-8");
String urlParameters = "json=" + jsonString;
con.setDoOutput(true);
DataOutputStream wr = new DataOutputStream(con.getOutputStream());
wr.writeBytes(urlParameters);
wr.flush();
wr.close();
InputStream instream;
int status = con.getResponseCode();
if (status != HttpURLConnection.HTTP_OK)
instream = con.getErrorStream();
else
instream = con.getInputStream();
BufferedReader in = new BufferedReader(new InputStreamReader(instream, "UTF-8")); // ISO-8859-1
in.mark(1);
if(in.read() != 0xFEFF)
in.reset();
String inputLine;
StringBuilder response = new StringBuilder();
while((inputLine = in.readLine()) != null)
response.append(inputLine);
in.close();
JSONObject object = new JSONObject(response.toString());
Boolean correct = object.getBoolean("correct");
if (correct) {
idUser = object.getInt("id");
}
} catch (Exception e) {
e.printStackTrace();
}
return idUser;
}
问题是响应包含一个UTF-8 BOM字符,邮递员的结果还可以,我可以看到id:( {"id":"7","correct":true}
)
但是在android studio上调试时, idUser
的值为""
或null
,我不知道为什么,我尝试了很多方法来解决此问题而没有成功。
同样在php
服务器端,我执行了echo mb_detect_encoding($idUsuario);
并且我得到了ASCII
编码,以防可能找到解决方案。
任何帮助将不胜感激,谢谢!
所以最后我得到了解决方案,我把它发布在这里,以防有人和我有同样的问题,问题出在JSON的参数上,因为它们包括UTF-8
字符(例如€
,所以不要读取这样的参数:
wr.writeBytes (urlParameters);
我必须这样做:
byte[] buf = urlParameters.getBytes("UTF-8");
wr.write(buf, 0, buf.length);
如果有人需要,我还会发布完整的功能:
public static Integer getUserIdOwnerOfMsg(Message msg) {
Integer idUser = null;
try {
JSONObject jsonObject = new JSONObject();
jsonObject.put("textMsg", msg.getTextMsg());
jsonObject.put("hourMsg", msg.getHourMsg());
List list = new LinkedList();
list.addAll(Arrays.asList(jsonObject));
String jsonString = list.toString();
String urlStr = SERVER_PATH + "getUserIdOwnerOfMsgJSON.php";
URL url = new URL(urlStr);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("POST");
con.setRequestProperty("User-Agent", "your user agent");
con.setRequestProperty("Accept-Language", "sp,SP;q=0.5");
String urlParameters = "json=" + jsonString;
con.setDoOutput(true);
DataOutputStream wr = new DataOutputStream (con.getOutputStream());
byte[] buf = urlParameters.getBytes("UTF-8");
wr.write(buf, 0, buf.length);
wr.flush();
wr.close();
InputStream instream;
int status = con.getResponseCode();
if (status != HttpURLConnection.HTTP_OK)
instream = con.getErrorStream();
else
instream = con.getInputStream();
BufferedReader in = new BufferedReader(new InputStreamReader(instream, Charset.forName("UTF-8")),8192);
String inputLine;
StringBuilder response = new StringBuilder();
while((inputLine = in.readLine()) != null)
response.append(inputLine);
JSONObject object = new JSONObject(response.toString());
Boolean correct = object.getBoolean("correct");
if (correct) {
try {
String idUserText = object.getString("id");
idUser = Integer.valueOf(idUserText);
} catch (NumberFormatException e) {
e.printStackTrace();
}
}
in.close();
} catch (Exception e) {
e.printStackTrace();
}
return idUser;
}
仅此而已,祝您编程愉快!
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