我写过这样的话：
package mypackage;
import java.io.InputStream;
import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.io.StreamConnection;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.component.RichTextField;
import net.rim.device.api.ui.container.MainScreen;
/**
* A class extending the MainScreen class, which provides default standard
* behavior for BlackBerry GUI applications.
*/
public final class MyScreen extends MainScreen implements FieldChangeListener
{
private static String HEADER_CONTENTTYPE = "content-type";
private static String CONTENTTYPE_TEXTHTML = "text/html";
String content = "";
private static final int STATE_0 = 0;
private static final int STATE_1 = 1;
private static final int STATE_2 = 2;
private static final int STATE_3 = 3;
private static final int STATE_4 = 4;
private static final int STATE_5 = 5;
private static final char HTML_TAG_OPEN = '<';
private static final char HTML_TAG_CLOSE = '>';
private static final char CR = 0x000D;
private static final char LF = 0x000A;
private static final char TAB = 0x0009;
/**
* Creates a new MyScreen object
*/
public MyScreen()
{
// Set the displayed title of the screen
setTitle("MyTitle");
final ButtonField bf = new ButtonField("New");
FieldChangeListener listener = new FieldChangeListener()
{
public void fieldChanged(Field field, int context) //respond
to button events
{
if(context != PROGRAMMATIC)
{
if(field==bf)
{
//System.out.println("==============================");
fun1();
}
}
}
};
RichTextField rtf = new RichTextField("hello");
bf.setChangeListener(listener);
add(bf);
}
void fun1()
{
try
{
System.out.println("asd");
//Dialog.alert("asd");
String str =
fun_dwn_txt("www.google.co.in");
Dialog.alert(str);
}
catch(Exception e)
{ Dialog.alert("Sorry");
System.out.println("asd");
}
}
String fun_dwn_txt(String str_url) throws Exception
{
StreamConnection s = null;
s = (StreamConnection)Connector.open(str_url);
HttpConnection httpConn = (HttpConnection)s;
int status = httpConn.getResponseCode();
if (status == HttpConnection.HTTP_OK)
{
// Is this html?
String contentType = httpConn.getHeaderField(HEADER_CONTENTTYPE);
boolean htmlContent = (contentType != null &&
contentType.startsWith(CONTENTTYPE_TEXTHTML));
InputStream input = s.openInputStream();
byte[] data = new byte[256];
int len = 0;
int size = 0;
StringBuffer raw = new StringBuffer();
while ( -1 != (len = input.read(data)) )
{
// Exit condition for the thread. An IOException is
// thrown because of the call to httpConn.close(),
// causing the thread to terminate.
// if ( _stop )
// {
// httpConn.close();
// s.close();
// input.close();
// }
raw.append(new String(data, 0, len));
size += len;
}
raw.insert(0, "bytes received]\n");
raw.insert(0, size);
raw.insert(0, '[');
content = raw.toString();
if ( htmlContent )
{
content = prepareData(raw.toString());
}
input.close();
}
else
{
content = "No";
}
s.close();
return content;
}
private String prepareData(String text)
{
final int text_length = text.length();
StringBuffer data = new StringBuffer(text_length);
int state = STATE_0;
int count = 0;
int writeIndex = -1;
char c = (char)0;
for ( int i = 0; i < text_length; ++i)
{
c = text.charAt(i);
switch ( state )
{
case STATE_0:
if ( c == HTML_TAG_OPEN )
{
++count;
state = STATE_1;
}
else if ( c == ' ' )
{
data.insert(++writeIndex, c);
state = STATE_5;
}
else if ( !specialChar(c) )
{
data.insert(++writeIndex, c);
}
break;
case STATE_1:
if ( c == '!' && text.charAt(i + 1) == '-' &&
text.charAt(i + 2) == '-' )
{
System.out.println("Entering Comment state");
i += 2;
state = STATE_3;
}
else if ( Character.toLowerCase(c) == 'p' )
{
state = STATE_4;
}
else if ( c == HTML_TAG_CLOSE )
{
--count;
state = STATE_0;
}
else
{
state = STATE_2;
}
break;
case STATE_2:
if ( c == HTML_TAG_OPEN )
{
++count;
}
else if ( c == HTML_TAG_CLOSE )
{
if( --count == 0 )
{
state = STATE_0;
}
}
break;
case STATE_3:
if ( c == '-' && text.charAt(i+1) == '-' &&
text.charAt(i + 2) == HTML_TAG_CLOSE )
{
--count;
i += 2;
state = STATE_0;
System.out.println("Exiting comment state");
}
break;
case STATE_4:
if ( c == HTML_TAG_CLOSE )
{
--count;
data.insert(++writeIndex, '\n');
state = STATE_0;
}
else
{
state = STATE_1;
}
break;
case STATE_5:
if ( c == HTML_TAG_OPEN )
{
++count;
state = STATE_1;
}
else if ( c != ' ' )
{
state = STATE_0;
if ( !specialChar(c) )
{
data.insert(++writeIndex, c);
}
}
break;
}
}
return data.toString().substring(0, writeIndex + 1);
}
private boolean specialChar(char c)
{
return c == LF || c == CR || c == TAB;
}
public void fieldChanged(Field field, int context) {
// TODO Auto-generated method stub
}
}
但是在按钮上单击没有任何事情发生..甚至HttpConnection.HTTP_OK没有响应..
我缺少一些细节，我必须在xml中提及互联网连接...
请提出建议......
答案 0 :(得分：2)
www.google.co.in不是网址。您需要使用http://www.google.co.in或https://www.google.co.in
您没有指定连接方法（BES，BIS-B，WiFi等）。虽然这可能有用，但它并不总是有效。你在使用WLAN吗？然后在连接字符串中使用;interface=wifi后缀。 BES？使用;deviceside=false等。
有关详细信息，请参阅this article。在BlackBerry中使用Connector API并不容易。如果您有更新的BlackBerry（设备软件版本5.0+），那么使用Network API
可能会更容易