私たちはブラックベリーでウェブサービスを利用しようとしています。ブラックベリーでアプリを開発するのは非常に新しいです。ウェブを検索した後、org.json.mejarを使用してブラックベリーでjsonウェブサービスを利用できることがわかりました。 BBでxmlベースのWebサービスを利用できますが、データを取得してWebサービスに送信する方法がわかりません。
xml応答を提供するために取得したWebサービスのURLは次のとおりです。
http://somedomainname.com/wcfservice/RestServiceImpl.svc/XML/log
BBでjson/xml /ksoapWebサービスを利用する方法をガイドまたは提案してください。
どんな助けでも大歓迎です
BBでjsonを取得して解析する方法の例を次に示します。
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;
}
}
そして、BBでXMLを取得して解析する方法について：
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