我在 J2ME 中创建了一个应用程序，它使用以下方法连接到服务器。php 在服务器端用于处理请求。该应用程序在诺基亚 asha 303 等手机上运行良好，但在其他手机上抛出 IOException，这可能是此代码的问题。此方法在不同的线程上调用。我还想问你是否在 j2me 中使用 post 并设置
httpConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
您是否必须在发送前对数据进行 urlencode 或由 j2me 自动处理
public String sendData(String serverUrl, String dataToSend) {
String strResponse = "0"; //string to hold serverResponse
StringBuffer sb = new StringBuffer("");
HttpConnection httpConn = null;
InputStream inputStream = null;
OutputStream outStream = null;
try {
//convert the dataToSend to bytes
String strData = dataToSend; // get the data to Send and store it in a variable.
byte[] dataToSendBytes = strData.getBytes();
//open the Connection to the server.
httpConn = (HttpConnection) Connector.open(serverUrl, Connector.READ_WRITE, true);
if (httpConn != null) {
httpConn.setRequestMethod(HttpConnection.POST); // method used to send the data.
httpConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
httpConn.setRequestProperty("User-Agent", "Profile/MIDP-2.0 Configuration/CLDC-1.1");
//httpConn.setRequestProperty("Content-Language", "en-US"); //language to use.
//setRequestProperty("Connection", "close") ===> could generate or Solve IOExceptions on different mobile Phones.
//httpConn.setRequestProperty("Connection", "close");
//setting the Content-length could have issues with some Servers===>
//if the dataToSend is Empty String => contentLen = 0 , else get length of the dataBytes.
String contentLen = ((dataToSend.length() > 0) ? Integer.toString(dataToSendBytes.length) : Integer.toString(0));
//httpConn.setRequestProperty("Content-length", contentLen); //not working on Emulator ....enable on shipping application.
//open the output Stream to send data to the Server.
outStream = httpConn.openOutputStream();
// send the bytes of data to the Server.===>
//outStream.write(dataToSendBytes);
//send the data bytes to the Server.
int byteLen = dataToSendBytes.length; //length of byteToSend.
for (int k = 0; k < byteLen; k++) {
//send all the databytes to the Server.
outStream.write(dataToSendBytes[k]);
}
//close the outputStream ===immediately after sending the data bytes to the Server===>eliminates the IOExceptions.
closeOutStream(outStream);
//get response code on Sending Data===> getting response code automatically flushes the output data.
ntworkResponseCode = httpConn.getResponseCode();
if (ntworkResponseCode == HttpConnection.HTTP_OK) {
//connection to the Server was okay.
if (httpConn != null) {
//read the Response From the Server-----------
inputStream = httpConn.openInputStream(); // open the inputStream.
//get server Response Content length.
int contLen = (int) httpConn.getLength();
byte[] serverResponseBytes; //byte array to store the serverResponse.
if (contLen != -1) {
//store the serverResponse to a byte array.===> using a byte buffer could be faster.
serverResponseBytes = new byte[contLen];
inputStream.read(serverResponseBytes);
//convert the bytes to String and store them to the StringBuffer.
sb.append(new String(serverResponseBytes));
} else {
//serverResponse Length not available===> read character by character could be slower.
int read;
while ((read = inputStream.read()) != -1) {
sb.append((char) read);
}
}
//store the server response in a String.
strResponse = sb.toString();
}
} else {
//connection problem occured.
//throw new IOException("Http Response Code [" + ntworkResponseCode + "]");
}
}// the httpConnection Not null.--end.
} catch (IllegalArgumentException arge) {
strResponse = CONNECTION_EXCEPTION;
} catch (ConnectionNotFoundException cone) {
//a string to show we got an exception
strResponse = CONNECTION_EXCEPTION;
} catch (IOException ioe) {
//a string to show we got an exception
strResponse = CONNECTION_EXCEPTION;
} catch (SecurityException se) {
//user cancelled the Connection Request.
strResponse = CONNECTION_EXCEPTION;
} finally {
//close all the connection streams
try {
if (inputStream != null) {
//close the inputStream
inputStream.close();
inputStream = null;
}
if (outStream != null) {
//close the outStream.
outStream.close();
outStream = null;
}
if (httpConn != null) {
//close the connection object.
httpConn.close();
httpConn = null;
}
} catch (IOException ie) {
//show exception occured.
}
}
//return server Response to the Client.
return strResponse;
}