Android HttpClient example

AndroidMenifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.ojtit.android.test.http"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".HttpConActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
    <uses-sdk android:minSdkVersion="7" />
 <uses-permission android:name="android.permission.INTERNET"/>
</manifest>

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView
    android:id="@+id/text"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"
    />
</LinearLayout>

HttpConActivity.java

package com.ojtit.android.test.http;
import java.io.*;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class HttpConActivity extends Activity {
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.main);
     TextView text =   (TextView)this.findViewById(R.id.text);
     try{
     //text.setText(getStringFromUrl("http://naver.com"));
     text.setText(getStringFromUrl(http://172.16.70.44/WebApp/index.jsp);
     }catch(Exception e){
      e.printStackTrace();
     }
     /* 웹서버에서 이미지를 수신하여 이미지뷰에 출력한다 */
     ImageView img = (ImageView)findViewById(R.id.img);
     Bitmap bitmap =
         DownloadImage("http://www.android.com/images/developers.gif");
     img = (ImageView) findViewById(R.id.img);
     img.setImageBitmap(bitmap);

     /* 웹서버에서 XML문서를 다운로드하여 Toast에 출력한다 */
     DownloadXML("http://172.16.70.44/WebApp/index.jsp");
 }
   
    public static InputStream getInputStreamFromUrl(String url){
       InputStream contentStream = null;
   
       try{
         HttpClient httpclient = new DefaultHttpClient();
         HttpResponse response = httpclient.execute(new HttpGet(url));
         contentStream = response.getEntity().getContent();
       } catch(Exception e){
          e.printStackTrace();
       }
       return contentStream;
    }
   
    public static String getStringFromUrl(String url) throws UnsupportedEncodingException{
    BufferedReader br = new BufferedReader(new InputStreamReader(getInputStreamFromUrl(url),"euc-kr"));
     
    StringBuffer sb = new StringBuffer();
   
    try{
     String line = null;
    
     while ((line = br.readLine())!=null){
      sb.append(line);
     }
    }catch (IOException e){
     e.printStackTrace();
    }
    return sb.toString();
 }

    private Bitmap DownloadImage(String URL)
    {       
        Bitmap bitmap = null;
        InputStream in = null;       
        try {
            in = getInputStreamFromUrl(URL);
            bitmap = BitmapFactory.decodeStream(in);
            /* 위에서 리턴된 bitmap은 ImageView에 출력할 수 있다 */
            in.close();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        return bitmap;               
    }
   
    private void DownloadXML(String URL)
    {
        InputStream in = null;
        try {
            in = getInputStreamFromUrl(URL);
            Document doc = null;
            DocumentBuilderFactory dbf =
                DocumentBuilderFactory.newInstance();
            DocumentBuilder db;
           
            try {
                db = dbf.newDocumentBuilder();
                doc = db.parse(in);
            } catch (ParserConfigurationException e) {
                e.printStackTrace();
            } catch (SAXException e) {
                e.printStackTrace();
            }       
           
            doc.getDocumentElement().normalize();
           
            NodeList itemNodes = doc.getElementsByTagName("student");
           
            String strName = null;
            for (int i = 0; i < itemNodes.getLength(); i++) {
                Node itemNode = itemNodes.item(i);
                if (itemNode.getNodeType() == Node.ELEMENT_NODE)
                {           
                    Element itemElement = (Element) itemNode;
                   
                    NodeList nameNodes =  itemElement.getElementsByTagName("name");
                   
                    Element nameElement = (Element) nameNodes.item(0);
                   
                    Node node = nameElement.getFirstChild();
                    strName = node.getNodeValue();

                    Toast.makeText(getBaseContext(),strName,
                        Toast.LENGTH_SHORT).show();
                }
            }
        } catch (IOException e1) {
            e1.printStackTrace();           
        }
    }

}

http://172.16.70.44/WebApp/index.jsp
<%@ page language="java" contentType="text/html; charset=EUC-KR"
    pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>환영합니다</title>
</head>
<body>
<%="index.jsp에 접속되었습니다" %>
</body>
</html>

JSP에서 Android단말기에 XML 포맷으로 응답하는 경우

<%@ page language="java" contentType="text/xml;charset=utf-8" %>
<students>
 <student>
  <name>홍길동</name>
  <num>100</num>
  <phone>234-6534-2345</phone>
 </student>
 <student>
  <name>박지성</name>
  <num>200</num>
  <phone>324-7546-8678</phone>
 </student>
</students>