本文所述實例源自一個項目開發中的登錄驗證功能，具體的要求就是，在Android端輸入用戶名和密碼，在服務器端驗證MySQL數據庫中是否有此用戶，實現之前當然首要的是，如何使Android端的數據發送到服務器端，具體的實現方法如下：
服務器端：ManageServlet.java代碼如下：
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("用戶名："+name+" 密碼："+password); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { }}在這里實現的僅僅是把用戶端的數據在控制臺打印出來，相信學過jsp開發的大神，剩下的數據驗證應該不在話下，在此不再贅述。
接下來就是Android端了：
主activity：MainActivity.java頁面代碼如下：
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(); } } }}布局文件如下：
<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>用于向服務器端發送數據的service（NewsService）：
public class NewsService { /** * 登錄驗證 * @param name 姓名 * @param password 密碼 * @return */ public static boolean save(String name, String password){ String path = "http://<span style="color: #ff0000;"><strong>192.168.1.104</strong></span>: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; } /** * 發送GET請求 * @param path 請求路徑 * @param student 請求參數 * @return 請求是否成功 * @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; }}因為需要連接網絡，一定要在AndroidManifest.xml進行網絡權限配置：
<uses-permission android:name="android.permission.INTERNET"/>
至此基本已經完成Android向服務器端發送數據，希望本文實例對大家的Android程序設計有所幫助。
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