android與server端servlet交互

一個關于android與server端servlet交互的demo,比項目中的例子要簡單很多。

入門的朋友可以參考下。

核心代碼：

/**
 * 
 * 項目名稱 JSONDemo
 * 包   名 servlet
 * 文   件  名 CustomerServlet.java
 * 開   發  人 Administrator
 * 描述信息 客戶端驗證用戶登陸Servlet
 * 發布日期 2012-4-6下午03:28:47
 * 修改日期 
 * 修   改  人        
 * 版本信息 V1.0
 *
 */
public class CustomerServlet extends HttpServlet {

    private static final long serialVersionUID = 314719472293387358L;

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        //登陸成功標志
        String LOGIN_FLAG="";
        //獲得客戶端提交用戶名密碼
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        //調用UserDAO中isLogin方法判斷數據中用戶名密碼是否正確
        boolean flag=UserDAO.isLogin(username, password);
        try {
            DataOutputStream output=new DataOutputStream(resp.getOutputStream());
            if (flag) {
                LOGIN_FLAG="success";
                output.writeUTF("服務器端數據:"+LOGIN_FLAG);
                System.out.println(LOGIN_FLAG);
                output.writeInt(1);
                  output.close(); 
            }else{
                 //登錄失敗  
                LOGIN_FLAG="failure";
                System.out.println(LOGIN_FLAG);
                output.writeUTF("服務器端數據:"+LOGIN_FLAG);
                output.close(); 
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

ClientDemo 核心代碼：

public class MainActivity extends Activity {
    //private static final int REQUEST_CODE = 2;  
     HttpPost httpRequest=new HttpPost(UriAPI.HTTPCustomer);  
     EditText et_name;
     EditText et_pwd;
     TextView show_login;
    Button btn_login;
    Button btn_cancle;
    ProgressDialog progressDialog;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //初始化登陸界面
        btn_login=(Button) findViewById(R.id.btn_login);
        btn_cancle=(Button) findViewById(R.id.btn_cancle);
        et_name=(EditText) findViewById(R.id.et_name);
        et_pwd = (EditText) findViewById(R.id.et_pwd);
        show_login=(TextView) findViewById(R.id.show_login);

        progressDialog = new ProgressDialog(this);
        btn_login.setOnClickListener(new OnClickListener() {

            @SuppressWarnings("unchecked")
            @Override
            public void onClick(View v) {
                //通過AsyncTask類提交數據 異步顯示
                new AT().execute(et_name.getText().toString(),et_pwd.getText().toString());
            }
        });

    }
    public class UriAPI {  
        /** 定義一個Uri **/  
        public static final String HTTPCustomer ="http://10.0.1.9:8026/JSONDemo/servlet/CustomerServlet";
    }
    @SuppressWarnings("rawtypes")
    class AT extends AsyncTask{

        String result="";
        @Override
        protected void onPreExecute() {
            //加載progressDialog
            progressDialog.show();
        }

        @Override
        protected Object doInBackground(Object... params_obj) {
            CharSequence username="";
            CharSequence password="";

            username=et_name.getText();

            password =et_pwd.getText();
            if(!username.equals("")&&!password.equals("")){
                //請求數據
                HttpPost httpRequest  = new HttpPost(UriAPI.HTTPCustomer);
                //創建參數  
                 List<NameValuePair> params=new ArrayList<NameValuePair>(); 
                 params.add(new BasicNameValuePair("username", username.toString()));
                 params.add(new BasicNameValuePair("password", password.toString()));
                 //params.add(new BasicNameValuePair("flag","0"));
                 try {
                     //對提交數據進行編碼
                    httpRequest.setEntity(new UrlEncodedFormEntity(params,HTTP.UTF_8));
                    HttpResponse httpResponse=new DefaultHttpClient().execute(httpRequest);
                    //獲取響應服務器的數據
                    if (httpResponse.getStatusLine().getStatusCode()==200) {
                        //利用字節數組流和包裝的綁定數據
                        byte[] data =new byte[2048];
                        //先把從服務端來的數據轉化成字節數組
                        data =EntityUtils. toByteArray((HttpEntity)httpResponse.getEntity());  
                        //再創建字節數組輸入流對象   
                        ByteArrayInputStream bais = new ByteArrayInputStream(data);  
                         //綁定字節流和數據包裝流   
                        DataInputStream dis = new DataInputStream(bais);  
                          //將字節數組中的數據還原成原來的各種數據類型，代碼如下：  
                        result=new String(dis.readUTF());
                           Log.i("服務器返回信息:", result);
                    }
                } catch(ClientProtocolException e){  
                    e.printStackTrace();  
                }catch(UnsupportedEncodingException e){  
                    e.printStackTrace();  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  

            }
            return result;
        }

      @Override
    protected void onPostExecute(Object result) {

          //獲得服務器返回信息成功后
          show_login.setText(result.toString());
          //取消進度條
          progressDialog.cancel();
      }

    } 
}

1.未登錄

2.登陸中

3.登陸成功

4.登陸失敗

源代碼下載