使用post方式提交数据

post提交代码

 public class MainActivity extends Activity {

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

     Handler handler = new Handler(){
         public void handleMessage(android.os.Message msg) {
             Toast.makeText(MainActivity.this, (String)msg.obj, 0).show();
         }
     };

     public void click(View v){
         EditText et_name = (EditText) findViewById(R.id.et_name);
         EditText et_pass = (EditText) findViewById(R.id.et_pass);

         final String name = et_name.getText().toString();
         final String pass = et_pass.getText().toString();

         Thread t = new Thread(){
             @Override
             public void run() {
                 //提交的数据需要经过url编码，英文和数字编码后不变
                 @SuppressWarnings("deprecation")
                 String path = "http://192.168.13.13/Web2/servlet/LoginServlet";

                 try {
                     URL url = new URL(path);
                     HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                     conn.setRequestMethod("POST");
                     conn.setConnectTimeout(5000);
                     conn.setReadTimeout(5000);

                     //拼接出要提交的数据的字符串
                     String data = "name=" + URLEncoder.encode(name) + "&pass=" + pass;
                     //添加post请求的两行属性
                     conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
                     conn.setRequestProperty("Content-Length", data.length() + "");

                     //设置打开输出流
                     conn.setDoOutput(true);
                     //拿到输出流
                     OutputStream os = conn.getOutputStream();
                     //使用输出流往服务器提交数据
                     os.write(data.getBytes());
                     if(conn.getResponseCode() == 200){
                         InputStream is = conn.getInputStream();
                         String text = Utils.getTextFromStream(is);

                         Message msg = handler.obtainMessage();
                         msg.obj = text;
                         handler.sendMessage(msg);
                     }
                 } catch (Exception e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
                 }
             }
         };
         t.start();

     }

 }

utils

 public class Utils {

     public static String getTextFromStream(InputStream is){

         byte[] b = new byte[1024];
         int len = 0;
         //创建字节数组输出流，读取输入流的文本数据时，同步把数据写入数组输出流
         ByteArrayOutputStream bos = new ByteArrayOutputStream();
         try {
             while((len = is.read(b)) != -1){
                 bos.write(b, 0, len);
             }
             //把字节数组输出流里的数据转换成字节数组
             String text = new String(bos.toByteArray());
             return text;
         } catch (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return null;
     }
 }