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:
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:
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>
用于向服务器端发送数据的service(NewsService):
public class NewsService {
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;
}
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:
<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。
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