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Thread: servlet applet communication

  1. #1
    Junior Member
    Join Date
    May 2009
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    Default servlet applet communication

    Hello...

    Iam stucked with an exception while trying to communicate between applet and servlet.
    the exception is
    java.io.StreamCorruptedException:..
    here are my files.. please give me a solution for this

    applet is:
    import java.awt.BorderLayout;
    import java.awt.Container;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.awt.event.MouseAdapter;
    import java.awt.event.MouseEvent;
    import java.io.*;
    import javax.servlet.*;
    import javax.servlet.http.*;
    import java.util.ArrayList;
    import java.util.Vector;
    import java.net.URL;
    import java.net.URLConnection;
     
    import javax.swing.JApplet;
    import javax.swing.JComboBox;
    import javax.swing.JLabel;
    import javax.swing.JList;
    import javax.swing.JPanel;
     
    public class SampleApplet extends JApplet implements ActionListener,Serializable {
     
        private static final long serialVersionUID = 1L;
     
        //String[] table_names = { "one", "two", "three", "four" };
        String[] table_names;
        String[] col1_names = { "one1", "two1", "three1", "four1" };
        String[] col2_names = { "one2", "two2", "three2", "four2" };
        ArrayList tnamelist;
     
        private JComboBox box;
     
        private Container contentPane;
        private JPanel panel = null;
        private JList list;
     
     
        //@Override
        public void init() {
            send();
            recieve();
        }
        public void send()
        {
        try
            {
                URL url = new URL(getCodeBase(), "http://localhost:8086/prashanthi/DBServlet");
            // open a connection to the servlet
            URLConnection servletConnection = url.openConnection();
            // prepare for both input and output
            servletConnection.setDoInput(true);
            servletConnection.setDoOutput(true);
            // don't use a cached version of URL connection
            servletConnection.setUseCaches (false);
            servletConnection.setDefaultUseCaches (false);
            // set the content type to indicate that we're sending binary data
            servletConnection.setRequestProperty ("Content-Type", "application/octet-stream");
            servletConnection.connect();
            ObjectOutputStream outputToServlet = new ObjectOutputStream(servletConnection.getOutputStream());
            Vector v=new Vector();
            v.addElement("First string from Applet to Servlet");
            v.addElement("Second string from Applet to Servlet");
            outputToServlet.writeObject(v);
            outputToServlet.flush();
            outputToServlet.close();
            }
            catch (Exception ex)
            {
                System.out.println(ex);
            }
     
        }
        public void recieve()
    {
    try
    {
    URL servletURL = new URL("http://localhost:8086/prashanthi/DBServlet");
    URLConnection servletConnection = servletURL.openConnection();
    servletConnection.setDoInput(true);
    servletConnection.setDoOutput(false);
    servletConnection.setUseCaches (false);
    servletConnection.setRequestProperty("Content-Type","application/octet-stream");
    servletConnection.connect();
    ObjectInputStream inputFromServlet=new ObjectInputStream(servletConnection.getInputStream());
    ArrayList a=(ArrayList)inputFromServlet.readObject();
    table_names=(String[])a.toArray(new String[tnamelist.size()]);
    box = new JComboBox(table_names);
            box.addActionListener(this);
            contentPane = getContentPane();
            contentPane.setLayout(new BorderLayout());
            contentPane.add(box, BorderLayout.NORTH);
    //textField.setText(v.elementAt(0).toString());
    }
    catch(Exception e)
    {
    e.printStackTrace();
    }
    }
     
        public void actionPerformed(ActionEvent e) {
            if(list!=null)
            {
                contentPane.remove(list);
            }
            String item = (String) box.getSelectedItem();
            if (item.equals("one")) {
                list = new JList(col1_names);
            } else if (item.equals("two")) {
                list = new JList(col2_names);
            }
            list.addMouseListener(new MouseAdapter() {
     
                @Override
                public void mousePressed(MouseEvent e) {
                    if (panel != null)
                        contentPane.remove(panel);
                    panel = new JPanel();
                    String value = (String) list.getSelectedValue();
                    JLabel lvalue=new JLabel(value);
                    if(lvalue!=null)
                    {
                        panel.remove(lvalue);
                    }
                    panel.add(lvalue);
     
                    //if (value.contains("one"))
                        //panel.add(new JLabel("Clicked One"));
                    //else
                        //panel.add(new JLabel("Clicked Second One"));
     
     
                    contentPane.add(panel, BorderLayout.SOUTH);
                    contentPane.validate();
                }
            });
            System.out.println("SampleApplet.actionPerformed() " + item);
            contentPane.add(list, BorderLayout.CENTER);
            contentPane.validate();
        }
    }
     
     
    and my servlet is:
     
    import javax.servlet.*;
    import javax.servlet.http.*;
    import java.io.*;
    import java.util.ArrayList;
    import java.util.Vector;
    import java.sql.*;
    public class DBServlet extends HttpServlet implements Serializable
    {
        Connection con=null;
        Statement st=null;
        ResultSet rs=null;
        ArrayList tnlist;
        String s=null;
        public void doGet(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException
        {
            doPost(req,res);
        }
        public void doPost(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException
        {
            tnlist=new ArrayList();
            res.setContentType("text/html");
            PrintWriter out=res.getWriter();
            out.println("hello");
            try
            {
                out.println("hello1");
            Class.forName("oracle.jdbc.OracleDriver");
            out.println("loading driver");
            con=DriverManager.getConnection("jdbc:oracle:thin:@10.2.152.251:1533:VIS","edms45","edms45");
     
            st=con.createStatement();
     
            rs=st.executeQuery("select distinct VIEW_NAME from AJ_REPORT_COLUMNS_TMP");
     
            while(rs.next())
                {
                    s=rs.getString(1);
                    tnlist.add(rs.getString(1));
                    out.println(s);
                }
     
     
            try
    {
    ObjectInputStream inputFromApplet = new ObjectInputStream(req.getInputStream());// <-
    System.out.println("Obtained Input Stream");
    Vector v=(Vector)inputFromApplet.readObject();
    out.println("After readObject()");
    inputFromApplet.close();
    out.println("First String Obtained from applet is "+v.elementAt(0));
    out.println("Second String Obtained from applet is "+v.elementAt(1));
    ObjectOutputStream outputToApplet=new ObjectOutputStream(res.getOutputStream());
    out.println("Obtained output Stream");
    outputToApplet.writeObject(tnlist);
    outputToApplet.flush();
    outputToApplet.close();
    out.println("Stream closed");// LAST LINE
    }
    catch(Exception e)
    {
    e.printStackTrace();
    }
            }
            catch (SQLException e)
            {
                out.println(e);
            } catch (ClassNotFoundException ce) {
                // TODO Auto-generated catch block
                out.println(ce);
            }
     
     
        }
     
     
     
    }

    please let me know the solution for this..
    thanks in advance
    Last edited by JavaPF; May 21st, 2009 at 03:04 AM. Reason: Please use [code] [/code] tags


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