解析格式 - 解析例外
题
我正在使用ICAL4J来解析Android上的ICal格式。
我的输入是:
BEGIN:VCALENDAR
BEGIN:VEVENT
SEQUENCE:5
DTSTART;TZID=US/Pacific:20021028T140000
DTSTAMP:20021028T011706Z
SUMMARY:Coffee with Jason
UID:EC9439B1-FF65-11D6-9973-003065F99D04
DTEND;TZID=US/Pacific:20021028T150000
END:VEVENT
END:VCALENDAR
但是,当我尝试解析这个问题时,我会得到例外:
Error at line 1: Expected [VCALENDAR], read [VCALENDARBEGIN]
相关代码是:
HttpHelper httpHelper = new HttpHelper(
"http://10.0.2.2/getcalendar.php", params);
StringBuilder response = httpHelper.postData();
StringReader sin = new StringReader(response.toString());
CalendarBuilder builder = new CalendarBuilder();
Calendar cal = null;
try {
cal = builder.build(sin);
} catch (IOException e) {
Log.d("calendar", "io exception" + e.getLocalizedMessage());
} catch (ParserException e) {
Log.d("calendar", "parser exception" + e.getLocalizedMessage());
}
public class HttpHelper {
final HttpClient client;
final HttpPost post;
final List<NameValuePair> data;
public HttpHelper(String address, List<NameValuePair> data) {
client = new DefaultHttpClient();
post = new HttpPost(address);
this.data = data;
}
private class GetResponseTask extends AsyncTask<Void, Void, StringBuilder> {
protected StringBuilder doInBackground(Void... arg0) {
try {
HttpResponse response = client.execute(post);
return inputStreamToString(response.getEntity().getContent());
} catch (ClientProtocolException e) {
} catch (IOException e) {
}
return null;
}
}
public StringBuilder postData() {
try {
post.setEntity(new UrlEncodedFormEntity(data));
return (new GetResponseTask().execute()).get();
} catch (UnsupportedEncodingException e) {
} catch (InterruptedException e) {
} catch (ExecutionException e) {
}
return null;
}
private StringBuilder inputStreamToString(InputStream is)
throws IOException {
String line = "";
StringBuilder total = new StringBuilder();
// Wrap a BufferedReader around the InputStream
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
// Read response until the end
while ((line = rd.readLine()) != null) {
total.append(line);
Log.v("debug", "Line: " + line);
}
// Return full string
return total;
}
}
解决方案
我的猜测是响应字符串中的线结尾与ICAL4J的期望不同。
标准指定您应使用CRLF(aka' r n')。
其他提示
输入文件是有效的,问题在于您的方法InputStreamToString(),该输入文件在输入(剥离newlines)上执行readline()并附加到字符串,而无需重新添加Newlines。
我建议要使用替代方案来readline()(如果要从原始文件中保存新线),或者在循环中附加您自己的newlines,例如:
while ((line = rd.readLine()) != null) {
total.append(line);
total.append("\r\n");
Log.v("debug", "Line: " + line);
}
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