android与server端servlet交互

openkk 7年前

一个关于android与server端servlet交互的demo,比项目中的例子要简单很多。

入门的朋友可以参考下。

核心代码:

/**   *    * 项目名称 JSONDemo   * 包   名 servlet   * 文   件  名 CustomerServlet.java   * 开   发  人 Administrator   * 描述信息 客户端验证用户登陆Servlet   * 发布日期 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 {    //登陆成功标志    String LOGIN_FLAG="";    //获得客户端提交用户名密码    String username = req.getParameter("username");    String password = req.getParameter("password");    //调用UserDAO中isLogin方法判断数据中用户名密码是否正确    boolean flag=UserDAO.isLogin(username, password);    try {     DataOutputStream output=new DataOutputStream(resp.getOutputStream());     if (flag) {      LOGIN_FLAG="success";      output.writeUTF("服务器端数据:"+LOGIN_FLAG);         System.out.println(LOGIN_FLAG);      output.writeInt(1);        output.close();      }else{       //登录失败        LOGIN_FLAG="failure";      System.out.println(LOGIN_FLAG);      output.writeUTF("服务器端数据:"+LOGIN_FLAG);      output.close();      }    } catch (Exception e) {     e.printStackTrace();    }       }  }

ClientDemo 核心代码:

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);          //初始化登陆界面          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) {      //通过AsyncTask类提交数据 异步显示      new AT().execute(et_name.getText().toString(),et_pwd.getText().toString());     }    });                }      public class UriAPI {            /** 定义一个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() {        //加载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("")){      //请求数据      HttpPost httpRequest  = new HttpPost(UriAPI.HTTPCustomer);      //创建参数         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 {        //对提交数据进行编码       httpRequest.setEntity(new UrlEncodedFormEntity(params,HTTP.UTF_8));       HttpResponse httpResponse=new DefaultHttpClient().execute(httpRequest);       //获取响应服务器的数据       if (httpResponse.getStatusLine().getStatusCode()==200) {        //利用字节数组流和包装的绑定数据        byte[] data =new byte[2048];        //先把从服务端来的数据转化成字节数组        data =EntityUtils. toByteArray((HttpEntity)httpResponse.getEntity());          //再创建字节数组输入流对象           ByteArrayInputStream bais = new ByteArrayInputStream(data);           //绑定字节流和数据包装流           DataInputStream dis = new DataInputStream(bais);            //将字节数组中的数据还原成原来的各种数据类型,代码如下:          result=new String(dis.readUTF());           Log.i("服务器返回信息:", result);       }      } catch(ClientProtocolException e){                        e.printStackTrace();                    }catch(UnsupportedEncodingException e){                        e.printStackTrace();                    } catch (IOException e) {                        e.printStackTrace();                    }             }     return result;    }               @Override      protected void onPostExecute(Object result) {                //获得服务器返回信息成功后         show_login.setText(result.toString());         //取消进度条         progressDialog.cancel();        }            }   }

界面截图

1.未登录

未登录

2.登陆中

登陆中

3.登陆成功

登陆成功

4.登陆失败

登陆失败

源代码下载