Android开发之登录验证

最近在做一个小项目，项目开发中需要实现一个登录验证功能，具体的要求就是，在Android端输入用户名和密码，在服务器端验证MySQL数据库中是否有此用户，实现之前当然首要的是，如何使Android端的数据发送到服务器端，具体的实现方法：

服务器端：ManageServlet.java

public class ManageServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		response.setCharacterEncoding("utf-8");
		String name = request.getParameter("name");
		String password = request.getParameter("password");
		System.out.println("用户名："+name+"  密码："+password);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

	}

}

　在这里实现的仅仅是把用户端的数据在控制台打印出来，相信学过jsp开发的大神，剩下的数据验证应该不在话下，在此不再赘述。

接下来就是Android端了：

主activity：MainActivity.java

public class MainActivity extends Activity {

	private  EditText textname = null;
	private  EditText textpassword = null;
	private  Button button = null;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		textname = (EditText)findViewById(R.id.name);
		textpassword = (EditText)findViewById(R.id.password);
		button = (Button)findViewById(R.id.button);

		button.setOnClickListener(new mybuttonlistener());

	}

	class mybuttonlistener implements OnClickListener{

		boolean result=false;
		String name;
		String password;

		public void onClick(View v) {

			try {
				name = textname.getText().toString();
				name = new String(name.getBytes("ISO8859-1"), "UTF-8");
				password = textpassword.getText().toString();
				password = new String(password.getBytes("ISO8859-1"), "UTF-8");
			} catch (UnsupportedEncodingException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}

			try {
				result = NewsService.save(name,password);
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

			if(result){
				Toast.makeText(MainActivity.this, R.string.ok, Toast.LENGTH_SHORT).show();
			}else{
				Toast.makeText(MainActivity.this, R.string.error, Toast.LENGTH_SHORT).show();
			}

		}

	}

}

　布局文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="${relativePackage}.${activityClass}"
    >
	<LinearLayout
	    android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical"
	    >
	    <TextView
	        android:layout_width="wrap_content"
	        android:layout_height="wrap_content"
	        android:text="@string/name" />
	   	<EditText
	   	    android:id="@+id/name"
	   	    android:layout_width="fill_parent"
	   	    android:layout_height="wrap_content"
	   	    android:hint="@string/playname"
	   	    android:singleLine="true"
	   	    />
	   	<TextView
	        android:layout_width="wrap_content"
	        android:layout_height="wrap_content"
	        android:text="@string/password" />
	   	<EditText
	   	    android:id="@+id/password"
	   	    android:layout_width="fill_parent"
	   	    android:layout_height="wrap_content"
	   	    android:password="true"
	   	    android:hint="@string/playpass"
	   	    android:singleLine="true"
	   	    />
	   	<Button
	   	    android:id="@+id/button"
	   	    android:layout_width="fill_parent"
	        android:layout_height="wrap_content"
	        android:onClick=""
	        android:text="@string/submit"
	   	    />
   	</LinearLayout>
</RelativeLayout>

　用于向服务器端发送数据的service（NewsService）：

public class NewsService {

	/**
	 * 登录验证
	 * @param name  姓名
	 * @param password  密码
	 * @return
	 */

	public static boolean save(String name, String password){

		String path = "http://192.168.1.104:8080/Register/ManageServlet";  

		Map<String, String> student = new HashMap<String, String>();
		student.put("name", name);
		student.put("password", password);

		try {
			return SendGETRequest(path, student, "UTF-8");
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return false;

	}

	/**
	 * 发送GET请求
	 * @param path   请求路径
	 * @param student   请求参数
	 * @return  请求是否成功
	 * @throws Exception
	 */

	private static boolean SendGETRequest(String path, Map<String, String> student, String ecoding) throws Exception{

		// http://127.0.0.1:8080/Register/ManageServlet?name=1233&password=abc

		StringBuilder url = new StringBuilder(path);
		url.append("?");
		for(Map.Entry<String, String> map : student.entrySet()){
			url.append(map.getKey()).append("=");
			url.append(URLEncoder.encode(map.getValue(), ecoding));
			url.append("&");
		}

		url.deleteCharAt(url.length()-1);
		System.out.println(url);
		HttpsURLConnection conn = (HttpsURLConnection)new URL(url.toString()).openConnection();
		conn.setConnectTimeout(100000);
		conn.setRequestMethod("GET");
		if(conn.getResponseCode() == 200){
			return true;
		}
		return false;
	}

}

　　红色的为自己电脑的IP地址。　

　因为需要连接网络，一定要在AndroidManifest.xml进行网络权限配置：

 <uses-permission android:name="android.permission.INTERNET"/>

　　写到这里基本已经把Android向服务器端发送数据，给大家分享完毕，如有不对的地方还望指正。