本文所述实例源自一个项目开发中的登录验证功能,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,具体的实现方法如下:
服务器端:ManageServlet.java代码如下:
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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页面代码如下:
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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:
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< 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):
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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://<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 ; } /** * 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 ; } } |
因为需要连接网络,一定要在AndroidManifest.xml进行网络权限配置:
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< uses-permission android:name = "android.permission.INTERNET" /> |
至此基本已经完成Android向服务器端发送数据,希望本文实例对大家的Android程序设计有所帮助。