Android網路編程使用HttpClient訪問web網站

Android網路編程使用HttpClient訪問web網站

HttpClientDemo.java介面就是兩個按鈕和一個文字框

/* * 用HttpClientlai 來訪問提交請求，接收響應 * A,發送GET請求 * 1,建立HttpClient對象；HttpClient httpclient=new DefaultHttpClient(); * 2,發送GET請求,建立HttpGet對象：HttpGet httpget=new HttpGet("http://www.baidu.com"); * 3，用HttpClient對象實行HttpGet對象會得到伺服器響應對象HttpResponse的對象，響應就封裝在HttpResponse中： *  HttpResponse httpresponse=httpclient.execute(httpget); * 4,從httpresponse響應中獲得Http執行個體HttpEntity entity=httpresponse.getEntity();  * */public class HttpClientDemo extends Activity {   TextView response;   //聲明HttpClient對象   HttpClient httpclient;   Handler handler=new Handler(){  public void handleMessage(Message msg){  if(msg.what==0x123){//  使用response顯示伺服器的響應  response.append(msg.obj.toString()+"\n");  }  }   };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_http_client);        //1,建立DefaultHttpClient對象，介面回調HttpClient是個介面        httpclient=new DefaultHttpClient();        response=(TextView) findViewById(R.id.response);    }    /*     * 向服務發送GET請求流程     *      * */    public void accessSecret(View v){    response.setText("");    //點擊按鈕，開啟線程，線上程中發送Get請求    new Thread(){    public void run(){    //2,建立一個HttpGet對象    HttpGet httpget=new HttpGet("http://localhost:8080/foo/secret.jsp");//jsp部署在To嗎cat伺服器上    try {        //3，用HttpClient對象實行HttpGet對象會得到伺服器響應對象HttpResponse的對象，響應就封裝在HttpResponse中    HttpResponse httpresponse=httpclient.execute(httpget);    //4,從httpresponse響應中獲得Http執行個體    HttpEntity entity=httpresponse.getEntity();    if(entity!=null){    //5,entity執行個體中獲得內容，建立輸入資料流，讀取伺服器內容    BufferedReader br=new BufferedReader(new InputStreamReader(entity.getContent()));    String line=null;    while((line=br.readLine())!=null){//迴圈從輸入資料流中讀取內容    Message msg=new Message();    msg.what=0x123;    msg.obj=line;        handler.sendMessage(msg);//發給UI線程更新UI組件    }    }    } catch (ClientProtocolException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}            }    }.start();    }    /*     * 發送Post請求流程     *      *      * */   public void showLogin(View v){   final View loginDialog=getLayoutInflater().inflate(R.layout.login, null);   new AlertDialog.Builder(HttpClientDemo.this)       .setTitle("登入系統")       .setView(loginDialog)       .setPositiveButton("確定", new DialogInterface.OnClickListener(){@Overridepublic void onClick(DialogInterface dialog, int which) {// 擷取對話方塊的使用者名稱和密碼final String name=((EditText)loginDialog.findViewById(R.id.name)).getText().toString();final String pass=((EditText)loginDialog.findViewById(R.id.pass)).getText().toString();//點擊確定，開啟線程，線上程中發送Post請求new Thread(){public void run(){try {//2,建立HttpPost對象HttpPost httppost=new HttpPost("http://localhost:8080/foo/login.jsp");//jsp部署在To嗎cat伺服器上//3,對傳遞的參數進行封裝，NameValuePair是簡單名稱值對節點類型List params=new ArrayList();params.add(new BasicNameValuePair("name",name));//添加參數params.add(new BasicNameValuePair("pass",pass));//3,設定編碼httppost.setEntity(new UrlEncodedFormEntity(params,HTTP.UTF_8));//4,HttpClient對象執行HttpPost請求，獲得相應HttpResponse httpresponse=httpclient.execute(httppost);//5,如果狀態代碼是200就表示伺服器成功相應if(httpresponse.getStatusLine().getStatusCode()==200){//200：響應成功，301/302：重新導向，404：not found未找到資源 ，501伺服器遇到錯誤，使其無法對請求提供服務String msg = EntityUtils.toString(httpresponse.getEntity());Looper.prepare();//提示登入成功Toast.makeText(HttpClientDemo.this, msg, Toast.LENGTH_LONG).show();Looper.loop();}} catch (ParseException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}.start();}       }).setNegativeButton("取消", null).show();    }