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;
    }
}