Android学习（49） -- 使用get方式提交数据

get方式提交的数据是直接拼接在url的末尾

final String path = "http://192.168.1.103/Web/servlet/CheckLogin?name=" + name + "&pass=" + pass;

发送get请求，代码和之前一样

URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setReadTimeout(5000);
conn.setConnectTimeout(5000);
if(conn.getResponseCode() == 200){

}

浏览器在发送请求携带数据时会对数据进行URL编码，我们写代码时也需要为中文进行URL编码

URLEncoder.encode(name)，过时了，编码是utf-8，这个比较方便，

URLEncoder.encode(name, “utf-8”)，这个是不过时的，如果编码不是utf-8需要使用这个。

String path = "http://192.168.1.103/Web/servlet/CheckLogin?name=" + URLEncoder.encode(name) + "&pass=" + pass;

核心代码

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?name=" + URLEncoder.encode(name) + "&pass=" + pass;

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

					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();

	}

}

getTextFromStream

	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) {
			e.printStackTrace();
		}
		return null;
	}