黑莓中的 Http 连接问题

Question

我正在开发一个应用程序，在该应用程序中我需要通过 POST 方法传递参数，所以我尝试使用 HTTPConnection 来实现，但它让我出错。没有建立连接。在这段代码中，我使用URLEncodedPostData 传递参数，但它不能

这是我的代码::

URLEncodedPostData postData = new URLEncodedPostData(URLEncodedPostData.DEFAULT_CHARSET, false);
                    //passing q’s value and ie’s value
                    postData.append("q", "remoQte");
                    postData.append("ie", "UTF-8");

                    ConnectionFactory conFactory = new ConnectionFactory();
                    ConnectionDescriptor conDesc = null;
                    try{
                        conDesc = conFactory.getConnection("http://www.google.co.in/search");
                    }catch(Exception e){
                        System.out.println(e.toString()+":"+e.getMessage());
                    }
                    String response = ""; // this variable used for the server response
                    // if we can get the connection descriptor from ConnectionFactory
                    if(null != conDesc){
                        try{
                            HttpConnection connection = (HttpConnection)conDesc.getConnection();
                            //set the header property
                            connection.setRequestMethod(HttpConnection.POST);
                            connection.setRequestProperty("Content-Length", Integer.toString(postData.size())); //body content of post data
                            connection.setRequestProperty("Connection", "close"); // close the connection after success sending request and receiving response from the server
                            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); // we set the content of this request as application/x-www-form-urlencoded, because the post data is encoded as form-urlencoded(if you print the post data string, it will be like this -> q=remoQte&ie=UTF-8).

                            //now it is time to write the post data into OutputStream
                            OutputStream out = connection.openOutputStream();
                            out.write(postData.getBytes());
                            out.flush();
                            out.close();

                            int responseCode = connection.getResponseCode(); //when this code is called, the post data request will be send to server, and after that we can read the response from the server if the response code is 200 (HTTP OK).
                            if(responseCode == HttpConnection.HTTP_OK){
                                //read the response from the server, if the response is ascii character, you can use this following code, otherwise, you must use array of byte instead of String
                                InputStream in = connection.openInputStream();
                                StringBuffer buf = new StringBuffer();
                                int read = -1;
                                while((read = in.read())!= -1)
                                    buf.append((char)read);
                                response = buf.toString();
                            }
                            Dialog.alert("response"+  response);

                            //don’t forget to close the connection
                            connection.close();

                        }catch(Exception e){
                            System.out.println(e.toString()+":"+e.getMessage());
                        }
                    }

更新::

import java.io.IOException;

import javax.microedition.io.HttpConnection;

import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.container.MainScreen;

import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapPrimitive;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransport;
import org.xmlpull.v1.XmlPullParserException;

public class UiMainscreen extends MainScreen {
    ButtonField loginButton;
     private static final String TAG_CONTACTS = "contacts";
     private static final String TAG_ID = "id";
     private static final String TAG_NAME = "name";
     private static final String TAG_EMAIL = "email";
     private static final String TAG_ADDRESS = "address";
     private static final String TAG_GENDER = "gender";
     private static final String TAG_PHONE = "phone";
     private static final String TAG_PHONE_MOBILE = "mobile";
     private static final String TAG_PHONE_HOME = "home";
     private static final String TAG_PHONE_OFFICE = "office";
    public UiMainscreen() {


        final ButtonField b=new ButtonField("JSON");
        add(b);

        FieldChangeListener listener=new FieldChangeListener() {
            public void fieldChanged(Field field, int context) {
                if(field==b){

                    try{    
                    String URL = "http://www.google.co.in/";
                    String METHOD_NAME = "search";
                    String NAMESPACE = "http://tempuri.org/";
                    String SOAP_ACTION = NAMESPACE+METHOD_NAME;

                   SoapObject resultRequestSOAP = null;
                   HttpConnection httpConn = null;
                   HttpTransport httpt;
                   SoapPrimitive response = null;
                   SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
                   request.addProperty("q", "remoQte");
                   request.addProperty("ie", "UTF-8");
                   System.out.println("The request is=======" + request.toString());
                   SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
                   envelope.dotNet = true;
                   envelope.setOutputSoapObject(request);

                   httpt = new HttpTransport(URL);
                   httpt.debug = true;
                   try
                   {
                       httpt.call(SOAP_ACTION, envelope);
                       response = (SoapPrimitive) envelope.getResponse();
                       String result =  response.toString();
                       resultRequestSOAP = (SoapObject) envelope.bodyIn;
}
                   catch (IOException e) {
                       // TODO Auto-generated catch block
                       System.out.println("The exception is IO==" + e.getMessage());
                   } catch (XmlPullParserException e) {

                       // TODO Auto-generated catch block
                       System.out.println("The exception xml parser example==="
                               + e.getMessage());
                   }
                   System.out.println( resultRequestSOAP);
                   Dialog.alert("resultRequestSOAP"+resultRequestSOAP);
                    }catch (Exception e) {
                         System.out.println("Problem==="
                                   + e.getMessage());
                    }
            }}
        };
        b.setChangeListener(listener);



    }

Answer 1

由于您想在连接中发布一些参数，也许以下内容可能会有所帮助。

String URL = "http://xxx.xxx.com/xxx/xxx.asmx";
String METHOD_NAME = yourMethodName;
String NAMESPACE = "http://tempuri.org/";
String SOAP_ACTION = NAMESPACE+METHOD_NAME;
SoapObject resultRequestSOAP = null;
HttpConnection httpConn = null;
HttpTransport httpt;
SoapPrimitive response = null;
SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
request.addProperty("username", user_id);
request.addProperty("password", password);
System.out.println("The request is=======" + request.toString());
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.dotNet = true;
envelope.setOutputSoapObject(request);
httpt = new HttpTransport(URL+C0NNECTION_EXTENSION);
httpt.debug = true;
try
{
    httpt.call(SOAP_ACTION, envelope);
    response = (SoapPrimitive) envelope.getResponse();
    String result =  response.toString();
    resultRequestSOAP = (SoapObject) envelope.bodyIn;
}
catch (IOException e) 
{
    System.out.println("The exception is IO==" + e.getMessage());
} 
catch (XmlPullParserException e) 
{
    System.out.println("The exception xml parser example==="
    + e.getMessage());
}
System.out.println( resultRequestSOAP);
return response + "";

这是向网络服务传递两个参数；用户名和密码。您可以进行相应的修改。连接扩展是您指定连接类型的部分； BES，WIFI等。如果是模拟器，您可以将其添加为connectionString = ";deviceside=true"。这利用了 Ksoap2 库，您可以通过 Properties -> Java Build Path -> Library 在项目中添加该库。

Answer 2

“未建立连接”表示设备无法使用选定的传输连接到服务器。请查看此答案：Unable to connect to internet in Blackberry device?

建立连接后，Sarah 关于传递参数和数据交换的帖子应该会有所帮助。