HttpUrlcon与HttpClinet(输入网络地址返回字符串,只实现Get方法)

最新推荐文章于 2024-07-31 18:23:27 发布

Justice-Lai

最新推荐文章于 2024-07-31 18:23:27 发布

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分类专栏：网络请求与Json

本文链接：https://blog.youkuaiyun.com/s611533106/article/details/40744779

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这篇博客介绍了如何在Android中使用HttpUrlConnection和HttpClient进行网络请求。通过创建线程执行GET请求，从指定URL获取数据并将其转换为字符串。代码示例展示了如何处理网络连接、输入流转换以及在主线程中更新UI。

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public class MainActivity extends Activity {

	protected static final int GET_JSON_STRING_OK = 0;
	protected static final int GET_JSON_STRING_OK2 = 1;
	private Context context;
	private Handler hanlder = new Handler() {
		public void handleMessage(Message msg) {
			switch (msg.what) {
				case GET_JSON_STRING_OK :
					Toast.makeText(context, (String) msg.obj, 0).show();
					break;
				case GET_JSON_STRING_OK2 :
					Toast.makeText(context, (String) msg.obj, 0).show();
					break;
			}
		};
	};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		context = this;
		HttpClientGet("http://www.baidu.com", "UTF-8");
		// HttpUrlConnGet("http://www.baidu.com","UTF-8");
	}

	private void HttpUrlConnGet(final String strurl, final String charset) {// 2.1HttpUrlConnGet
		new Thread() {
			public void run() {
				try {
					URL url = new URL(strurl);
					HttpURLConnection conn = (HttpURLConnection) url.openConnection();
					conn.setConnectTimeout(6000);
					InputStream is = conn.getInputStream();
					String string = inputStream2String(is, charset);// 2.0传入输入流,和编码,转换长字符串
					Message msg = new Message();
					msg.what = GET_JSON_STRING_OK2;
					msg.obj = string;
					hanlder.sendMessage(msg);
				} catch (MalformedURLException e) {
					e.printStackTrace();
				} catch (IOException e) {
					e.printStackTrace();
				}

			};
		}.start();

	}
	public static String inputStream2String(InputStream is, String charset) {// 2.0传入输入流,和编码,转换长字符串
		ByteArrayOutputStream baos = null;
		try {
			baos = new ByteArrayOutputStream();
			int i = -1;
			while ((i = is.read()) != -1) {
				baos.write(i);
			}
			return baos.toString(charset);
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (null != baos) {
				try {
					baos.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
				baos = null;
			}
		}
		return null;
	}

	private void HttpClientGet(final String strUrl, final String charset) {// 1.0HttpClient
		new Thread() {
			public void run() {

				try {
					HttpClient httpClient = new DefaultHttpClient(); // 1.0HttpClient对象
					HttpGet request = new HttpGet(strUrl); // 1.1HttpGet对象
					HttpResponse response = httpClient.execute(request); // 1.2获得HttpResponse对象
					if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {// 1.3请求200
						String string = EntityUtils.toString(response.getEntity(), charset);// 1.4响应成字符串,设置编码
						Message msg = new Message();// 1.5发送数据到UI线程更新
						msg.what = GET_JSON_STRING_OK;
						msg.obj = string;
						hanlder.sendMessage(msg);
					}
				} catch (Exception e) {
					e.printStackTrace();
				}
			};
		}.start();
	}
	//2秒按2次退出程序
	private long first;
	public void onBackPressed() {
		long now = System.currentTimeMillis();
		if (now - first >= 2000) {
			first = now;
			Toast.makeText(context, "再按一次退出程序", 0).show();
		} else {
			super.onBackPressed();
		}
	}
}