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[英]How to connect a J2me Midlet installed on a mobile device to a java application?
[英]How to clear the IOExceptionE error in j2me midlet when connect http and send sms vias?
我正在研究j2me移動應用程序部分。 我必須使用http連接和短信格式發送消息(使用短信網關)。
當我嘗試這樣做時, java.io.IOException: Resource limit exceeded for file handles
的java.io.IOException: Resource limit exceeded for file handles
我的控制台。
怎么避免這個? 這是我的連接代碼:
public boolean sendViaHTTP(String message)
{
System.out.println("enter HTTP Via");
HttpConnection httpConn = null;
String url = "http://xxx.com/test.php";
System.out.println("URL="+url);
InputStream is = null;
OutputStream os = null;
try
{
// Open an HTTP Connection object
httpConn = (HttpConnection)Connector.open(url);
// Setup HTTP Request to POST
httpConn.setRequestMethod(HttpConnection.POST);
httpConn.setRequestProperty("User-Agent",
"Profile/MIDP-2.0 Confirguration/CLDC-2.0");
httpConn.setRequestProperty("Accept_Language","en-US");
//Content-Type is must to pass parameters in POST Request
httpConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
String value = System.getProperty("com.nokia.network.access");
os = httpConn.openOutputStream();
String params;
params = "message=" + message;
os.write(params.getBytes());// input writes in server side
// Read Response from the Server
StringBuffer sb = new StringBuffer();
is = httpConn.openDataInputStream();
int chr;
while ((chr = is.read()) != -1)
sb.append((char) chr);
Response = sb.toString();
//switchDisplayable("", getForm());
//System.out.println("REsponse="+Response);
}
catch(IOException ex)
{
System.out.println(ex);
return false;
}
catch (Exception ex)
{
System.out.println(ex);
return false;
}
finally
{
try
{
if(is!= null)
is.close();
if(os != null)
os.close();
if(httpConn != null)
httpConn.close();
}
catch (Exception ex)
{
System.out.println(ex);
}
}
return true;
}
該異常(很可能)正在發生,因為在您完成讀取/寫入它們之后,您的應用程序中的某個位置並未關閉流。
為了說明,如果這個說法
if (is != null) is.close();
拋出異常(例如IOException
),然后finally
塊中的其余語句將不會被執行。 這可能會泄漏文件描述符。
問題也可能完全在代碼的另一部分,但異常消息明確指出您的應用程序使用太多文件描述符的問題,最可能的原因是資源泄漏。
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