Hi,
I want to invoke a servlet from an applet.I'll do some modifications(say
increment a variable) in the servlet and send it back to
applet for display.I'm getting IOException.Can anyone help me out.
Thanks in advance.
public class STrack implements Serializable
{
String count = new String(""); String str = new String(""); public String
getCount()
{ return count; }
public void setCount(String c)
{ count = c; }
public void setOrder(String ss)
{ str = ss; }
public String getOrder()
{ return str; }
}
public class CountServletApplet1 extends java.applet.Applet
{
private TextField SessionField,tf;
private Button SessionCount;
private Button GlobalCount;
private Button FileCount;
boolean isStandalone = false;
private URLConnection connect;
private URL u1;
String sum = "0";
public CountServletApplet1()
{
setLayout(new FlowLayout());
add(new Label("Count"));
SessionCount = new Button("Session Count");
FileCount = new Button("File Count");
GlobalCount = new Button("GlobalCount");
SessionField = new TextField("1");
tf = new TextField("");
add(SessionCount);
add(GlobalCount);
add(FileCount);
add(SessionField);
add(tf);
setVisible(true);
}
public static void main(String str[])
{
Frame frm = new Frame();
CountServletApplet app = new CountServletApplet();
frm.add(app); app.init(); app.start();
frm.show();
}
public String getParameter(String key,String def)
{
showStatus("I'm in parameter");
return isStandalone?System.getProperty(key,def):
(getParameter(key)!=null?getParameter(key):def);
}
public STrack readTrack(URLConnection con)
{
STrack track = null;
try
{
ObjectInputStream is = new ObjectInputStream(con.getInputStream());
System.err.println("Waiting for the response now");
track = (STrack)is.readObject();
is.close();
}
catch(Throwable x){x.printStackTrace();}
return track;
}
public void writeTrack(URLConnection con,STrack tt)
{
try
{
con.setUseCaches(false);
con.setRequestProperty("CONTENT_TYPE","application/octet-stream");
con.setDoInput(true);
con.setDoOutput(true);
ObjectOutputStream os = new ObjectOutputStream(con.getOutputStream());
System.err.println("Writing sessiontrack Object");
os.writeObject(tt);
os.flush();
os.close();
}
catch(Throwable x){x.printStackTrace();}
}
public boolean action(Event ae, Object arg)
{ if(ae.target == SessionCount)
{
try
{
showStatus("Clicked the local session track button");
System.out.println("Resetting Count..");
STrack track = new STrack();
track.setOrder(tf.getText());
u1 = new URL("http://localhost:8080" + "/servlet/CountServlet1");
System.err.println("Resetting Count..");
URLConnection con = u1.openConnection();
writeTrack(con,track);
STrack tt = readTrack(con);
if(tt!=null)
{
showStatus("U r in text field");
SessionField.setText(tt.getCount());
}
else
{
showStatus("U r in text field");
System.err.println("ReadObject failed");
return false;
}
}
catch(Throwable x){x.printStackTrace();return false;}
return true;
}
}
public class CountServlet1 extends HttpServlet
{ int count;
public void init(ServletConfig conf) throws ServletException
{
super.init(conf); count = 1;
}
public void service(HttpServletRequest req, HttpServletResponse res)
{
try
{
ObjectInputStream ois = new ObjectInputStream(req.getInputStream());
STrack track = (STrack)ois.readObject();
getTrackStatus(track);
res.setContentType("application/octet.stream");
ObjectOutputStream oos = new ObjectOutputStream(res.getOutputStream());
oos.writeObject(track);
oos.flush();
oos.close();
}
catch(Throwable e)
{ e.printStackTrace(); }
}
private void getTrackStatus(STrack track)
{ Integer c = new Integer(count + 1);
String str = c.toString();
track.setCount(str);
}
}
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