Question

我们试图在黑莓消费网络服务。我们在开发关于黑莓的书目方面非常新。在搜索网络之后,我们发现,我们可以使用org.json.me jar在黑莓消费json网络服务,但But,它只用了,我们发现我们可以消费B的xml网络服务。但我们不知道如何获得并向网络服务发送数据。

网络服务网吧,我们提供xml反应:

。

Please guide or suggest a way to consume json / xml /ksoap web service in BB.

Any help is appreciated

Answer 1

The example of how to rec and parse json in BB:

import net.rim.device.api.io.URI;
import net.rim.device.api.io.messaging.*;
import net.rim.device.api.ui.*
import net.rim.device.api.ui.component.*;
import net.rim.device.api.ui.container.*;
import java.io.*;
import org.json.me.*;

public class NetworkSample extends UiApplication 
{
    public static void main(String[] args) 
    {
        NetworkSample app = new NetworkSample();
        app.enterEventDispatcher();
    }
    public NetworkSample() 
    {
        pushScreen(new ParseJSONSample());
    }
}

class ParseJSONSample extends MainScreen implements FieldChangeListener
{

    ButtonField _btnJSON = new ButtonField(Field.FIELD_HCENTER);

    private static UiApplication _app = UiApplication.getUiApplication();

    public ParseJSONSample()
    {
        _btnJSON.setChangeListener(this);
        _btnJSON.setLabel("Fetch page");

        add(_btnJSON);
    }

    public void fieldChanged(Field button, int unused)
    {

        if(button == _btnJSON)
        {

            Thread t = new Thread(new Runnable() 
            {
                public void run()
                {
                    Message response = null;
                    String uriStr = "http://docs.blackberry.com/sampledata.json"; 
                    BlockingSenderDestination bsd = null;
                    try
                    {
                        bsd = (BlockingSenderDestination)
                                    DestinationFactory.getSenderDestination
                                        ("CommAPISample", URI.create(uriStr));
                        if(bsd == null)
                        {
                            bsd =
                              DestinationFactory.createBlockingSenderDestination
                                  (new Context("CommAPISample"),
                                   URI.create(uriStr), new JSONMessageProcessor()
                                   );
                        }

                        // Send message and wait for response
                        response = bsd.sendReceive();
                        _json = response.getObjectPayload();

                        if(_json != null)
                        {
                            _app.invokeLater(new Runnable() 
                            {

                                public void run() 
                                {
                                    _app.pushScreen(new JSONOutputScreen(_json));
                                }

                            });
                        }
                    }
                    catch(Exception e)
                    {
                        System.out.println(e.toString());
                    }
                    finally
                    {
                        if(bsd != null)
                        {
                            bsd.release();
                        }
                    }
                }


            });
            t.start();

        }

}

class JSONOutputScreen extends MainScreen implements TreeFieldCallback 
{

    private TreeField _treeField;

    public JSONOutputScreen(Object JSONData)
    {
        _treeField = new TreeField(this, Field.FOCUSABLE);
        add(_treeField);
        setTree(JSONData);
    }

    void setTree(Object obj)
    {
        int parentNode = 0;

        _treeField.deleteAll();

        try
        {
            if(obj instanceof JSONArray)
            {
                parentNode = populateTreeArray
                                  (_treeField, (JSONArray) obj, parentNode);
            }
            else if(obj instanceof JSONObject)
            {
                parentNode = populateTreeObject
                                 (_treeField, (JSONObject) obj, parentNode);
            }
        }
        catch(JSONException e)
        {
            System.out.println(e.toString());
        }

        _treeField.setCurrentNode(parentNode);
    }


    // Populate the trees with JSON arrays
    int populateTreeArray(TreeField tree, JSONArray o, int p) throws JSONException
    {
        Object temp;
        int newParent;

        newParent = tree.addChildNode(p, "Array " + p);

        for(int i = 0; i < o.length(); ++i)
        {
            temp = o.get(i);

            if(temp == null || temp.toString().equalsIgnoreCase("null"))
            {
                continue;
            }

            if(temp instanceof JSONArray)
            {
                 // Array of arrays
                populateTreeArray(tree, (JSONArray) temp, newParent);
            }
            else if(temp instanceof JSONObject)
            {
                // Array of objects
                populateTreeObject(tree, (JSONObject) temp, newParent);
            }
            else
            { // other values
                newParent = tree.addSiblingNode(newParent, temp.toString());
            }
        }

        return newParent;
    }


    // Populate the tree with JSON objects
    int populateTreeObject(TreeField tree, JSONObject o, int p) throws JSONException
    {
        Object temp;

        int newParent = tree.addChildNode(p, "Object" + p);

        JSONArray a = o.names();

        for(int i = 0; i < a.length(); ++i)
        {
            temp = o.get(a.getString(i));

            if(temp == null || temp.toString().equalsIgnoreCase("null"))
            {
                continue;
            }
            if(temp instanceof JSONArray)
            {
                populateTreeArray(tree, (JSONArray) temp, newParent);
            }
            else if(temp instanceof JSONObject)
            {
                populateTreeObject(tree, (JSONObject) temp, newParent);
            }
            else
            {
                tree.addSiblingNode
                        (newParent, a.getString(i) + ": " + temp.toString());
            }
        }

        return newParent;
    }


    public void drawTreeItem(TreeField treeField, Graphics graphics, int node,
            int y, int width, int indent) 
    {
        if(treeField == _treeField)
        {
            Object cookie = _treeField.getCookie(node);
            if(cookie instanceof String)
            {
                String text = (String) cookie;
                graphics.drawText(text, indent, y, Graphics.ELLIPSIS, width);
            }
        }

    }

    public boolean onSavePrompt()
    {
        // Suppress the save dialog
        return true;
    }

}

资料来源:

And about how to retrieve and parse XML in BB:

import javax.microedition.io.*;
import net.rim.device.api.ui.*;
import net.rim.device.api.ui.component.*;
import net.rim.device.api.ui.container.*;
import net.rim.device.api.system.*;
import net.rim.device.api.xml.parsers.*;
import org.w3c.dom.*;
import org.xml.sax.*;

class XML_Parsing_Sample extends UiApplication{
    //creating a member variable for the MainScreen
    MainScreen _screen= new MainScreen();
    //string variables to store the values of the XML document
    String _node,_element;
    Connection _connectionthread;

    public static void main(String arg[]){
        XML_Parsing_Sample application = new XML_Parsing_Sample();
        //create a new instance of the application
        //and start the application on the event thread
        application.enterEventDispatcher();
    }

    public XML_Parsing_Sample() {
        _screen.setTitle("XML Parsing");//setting title
        _screen.add(new RichTextField("Requesting....."));
        _screen.add(new SeparatorField());
        pushScreen(_screen); // creating a screen
        //creating a connection thread to run in the background
        _connectionthread = new Connection();
        _connectionthread.start();//starting the thread operation
    }

    public void updateField(String node, String element){
        //receiving the parsed node and its value from the thread
        //and updating it here
        //so it can be displayed on the screen
        String title="Title";
        _screen.add(new RichTextField(node+" : "+element));

        if(node.equals(title)){
            _screen.add(new SeparatorField());
        }
    }

    private class Connection extends Thread{
        public Connection(){
            super();
        }

        public void run(){
            // define variables later used for parsing
            Document doc;
            StreamConnection conn;

            try{
                //providing the location of the XML file,
                //your address might be different
                conn=(StreamConnection)Connector.open
                  ("http://localhost:8000/content/test.xml");
                //next few lines creates variables to open a
                //stream, parse it, collect XML data and
                //extract the data which is required.
                //In this case they are elements,
                //node and the values of an element
                DocumentBuilderFactory docBuilderFactory
                  = DocumentBuilderFactory. newInstance(); 
                DocumentBuilder docBuilder
                  = docBuilderFactory.newDocumentBuilder();
                docBuilder.isValidating();
                doc = docBuilder.parse(conn.openInputStream());
                doc.getDocumentElement ().normalize ();
                NodeList list=doc.getElementsByTagName("*");
                _node=new String();
                _element = new String();
                //this "for" loop is used to parse through the
                //XML document and extract all elements and their
                //value, so they can be displayed on the device

                for (int i=0;i<list.getLength();i++){
                    Node value=list.item(i).
                      getChildNodes().item(0);
                    _node=list.item(i).getNodeName();
                    _element=value.getNodeValue();
                    updateField(_node,_element);
                }//end for
            }//end try
            //will catch any exception thrown by the XML parser
            catch (Exception e){
                System.out.println(e.toString());
            }
        }//end connection function
    }// end connection class
}//end XML_Parsing_Sample

资料来源:

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