Android學習（49） -- 使用get方式提交數據

get方式提交的數據是直接拼接在url的末尾

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

發送get請求，代碼和之前一樣

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

}

浏覽器在發送請求攜帶數據時會對數據進行URL編碼，我們寫代碼時也需要為中文進行URL編碼

URLEncoder.encode(name)，過時了，編碼是utf-8，這個比較方便，
URLEncoder.encode(name, “utf-8”)，這個是不過時的，如果編碼不是utf-8需要使用這個。

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

核心代碼

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() {
				//提交的數據需要經過url編碼，英文和數字編碼後不變
				@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;
		//創建字節數組輸出流，讀取輸入流的文本數據時，同步把數據寫入數組輸出流
		ByteArrayOutputStream bos = new ByteArrayOutputStream( );
		try {
			while((len = is.read(b)) != -1){
				bos.write(b, 0, len);
			}
			//把字節數組輸出流裡的數據轉換成字節數組
			String text = new String(bos.toByteArray( ));
			return text;
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}