今天實現了簡易的登陸介面，通過與伺服器的簡單互動實現了登入的功能。

介面佈局使用相對佈局，不做過多講解，實現介面如下

居中的實現時將使用者名稱的標籤新增  android:layout_centerVertical="true"屬性

、

1、首先搭建伺服器

建立servlet檔案，方法的實現都放在doGet()中。

將客戶端輸入的使用者名稱和密碼傳入伺服器。

當用戶名和密碼都匹配時顯示登陸成功，否則失敗。

通過login.jsp測試

LoginServlet實現原始碼如下：

	request.setCharacterEncoding("UTF-8");
	String username = request.getParameter("userName");
	String password = request.getParameter("userpass");
	System.out.println(username+"***"+password);
		
	if(name.equals(username)&&"123".equals(password)){
		response.getOutputStream().write("成功".getBytes());
	}else {
		response.getOutputStream().write("失敗".getBytes());
	}
 

2、根據不同的傳輸方式將使用者名稱和密碼傳入伺服器

首先監聽登入按鈕

確定輸入的 使用者名稱和密碼不為空。

如果是通過get方法傳送資料，則需要將傳送的路徑定義為String spec = "http://172.16.237.145:8080/video/login.do?userName="
+ userName + "&userpass=" + userPass;

建立客戶端和伺服器的連線

判斷是否正確連線，並將結果通過裝入Message，通過 handler方法在客戶端上顯示是否成功登陸。

具體getOper()方法如下

public void getOper(String userName, String userPass) {

		try {
			String spec = "http://172.16.237.145:8080/video/login.do?userName="
					+ userName + "&userpass=" + userPass;
			URL url = new URL(spec);
			HttpURLConnection urlConnection = (HttpURLConnection) url
					.openConnection();
			urlConnection.setRequestMethod("GET");
			urlConnection.setReadTimeout(5000);
			urlConnection
					.setRequestProperty(
							"User-Agent",
							"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.154 Safari/537.36");

			if (urlConnection.getResponseCode() == 200) {
				InputStream is = urlConnection.getInputStream();
				String result = StreamTools.streamToStr(is);
				System.out.println("返回結果"+result);
				Message msg = new Message();
				msg.what = CHANGETEXTVIEW;
				msg.obj = result;
				handler.sendMessage(msg);
				System.out.println(userName+"==="+userPass);

			} else {
				System.out.println("連線失敗");
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}
 

不同有以下幾點：

spec路徑為String spec = "http://172.16.237.145:8080/video/login.do";

在傳輸使用者名稱和密碼時使用data，與路徑分開String data = "userName=" + userName + "&userpass="
+ userPass;

具體post方法如下：

public void postOper(String userName, String userPass){
		try {
			String spec = "http://172.16.237.145:8080/video/login.do";
			URL url = new URL(spec);
			HttpURLConnection urlConnection = (HttpURLConnection) url
					.openConnection();
			urlConnection.setRequestMethod("POST");
			String data = "userName=" + userName + "&userpass="
					+ userPass;
			//System.out.println(data);
			urlConnection.setReadTimeout(5000);
			urlConnection.setConnectTimeout(5000);

			urlConnection.setRequestProperty("Connection",
					"keep-alive");
			urlConnection.setRequestProperty("Content-Length",
					String.valueOf(data.getBytes().length));
			;
			urlConnection.setRequestProperty("Content-Type",
					"application/x-www-form-urlencoded");

			urlConnection
					.setRequestProperty(
							"User-Agent",
							"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.154 Safari/537.36");

			urlConnection.setDoInput(true);
			urlConnection.setDoOutput(true);

			OutputStream os = urlConnection.getOutputStream();

			os.write(data.getBytes());
			os.flush();
			if (urlConnection.getResponseCode() == 200) {
				InputStream is = urlConnection.getInputStream();
				String result = StreamTools.streamToStr(is);
				System.out.println("返回結果" + result);
				/*
				 * te_result.setText(result);
				 */
				Message msg = new Message();
				msg.what = CHANGETEXTVIEW;
				msg.obj = result;
				handler.sendMessage(msg);

			} else {
				System.out.println("連線失敗");
			}

		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

返回結果方法Handle使用內部類建立

具體程式碼如下：

private Handler handler = new Handler() {
		public void handleMessage(Message msg) {
			int what = msg.what;
			switch (what) {
			case CHANGETEXTVIEW:
				String result = (String) msg.obj;
				te_result.setText(result);
				System.out.println("---------------");
				break;
			default:
				break;
			}
		};
	};

public void login(View v) throws UnsupportedEncodingException {
		// TODO Auto-generated method stub
		int id = v.getId();
		switch (id) {
		case R.id.logInBtn:
			final String userName = URLEncoder.encode(et_username.getText().toString(),"UTF-8");
			final String userPass = et_pass.getText().toString();
			if (TextUtils.isEmpty(userName) || TextUtils.isEmpty(userPass)) {
				Toast.makeText(this, "使用者名稱或密碼不能為空", Toast.LENGTH_LONG).show();
			} else {
				Toast.makeText(this, "send", Toast.LENGTH_LONG).show();
				new Thread() {
					public void run() {
						getOper(userName, userPass);
						//postOper(userName, userPass);
					};
				}.start();

			}
			break;

		default:
			break;
		}
	}

總體來說專案不是很難，但是需要很仔細，我在碼的時候在post方法傳入時總是傳入空值，檢查後得知為String data = "userName=" + userName + "&userpass="
+ userPass;重uerName和userpass少了兩個“=”，這搞的我那個叫鬱悶。