android与server端servlet交互

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

2.登陆中

3.登陆成功

4.登陆失败