代码如下在下面的语句中写入System.out.println();也无法从后台打印出内容,请高手帮忙解答。try
{
URL myUrl =new URL ("http://"+host+"/servlet/httkprint");               ///:8080
URLConnection myUrlConn=(URLConnection)(myUrl.openConnection());
myUrlConn.setDoInput(true);
myUrlConn.setDoOutput(true);
PrintStream  myOutStream =new PrintStream( myUrlConn.getOutputStream() );
int count = result3.size();
int i=0;
for (i=0;i<count;i++ )
{
String tempStr = (String)result3.elementAt(i);
myOutStream.println(tempStr);
}
//保存完要清除result3
result3.removeAllElements();
myOutStream.close();
DataInputStream datainputstream = new DataInputStream(myUrlConn.getInputStream());
datainputstream.close();
  getAppletContext().showDocument(myUrl,"_blank");
}
catch(MalformedURLException mfURLe)
{
System.out.println("error url"+mfURLe);
}
catch (IOException ioe)
{
System.out.println("error io"+ioe);
}