Android 网络编程

最新推荐文章于 2024-09-09 06:15:00 发布

Sunday_Vssupermadman

最新推荐文章于 2024-09-09 06:15:00 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/hsstc/article/details/8956230

一，Tcp

Server端

		ServerSocket serverSocket = new ServerSocket(9999);
		//这时候堵塞在accept，知道客户端发出连接请求
		Socket clientSocket = serverSocket.accept();
		//网路上传送的数据流，所以得到stream
		InputStream inStream  = clientSocket.getInputStream();
		BufferedReader br = new BufferedReader(new InputStreamReader(inStream));
		//readLine()也堵塞住，直到有数据可以读出
		String message = br.readLine();

client端

		//执行下行代码，请求连接服务器。
		Socket clientSocket = new Socket("127.0.0.1",9999);
		//得到输出流，发送数据
		PrintWriter output = new PrintWriter(new BufferedWriter(  
                new OutputStreamWriter(clientSocket.getOutputStream())),true);
		output.println("csdn");

二,Udp

Server端

		//msg用于存放数据
		private byte[] msg = new byte[1024];
		DatagramPacket dPacket = new DatagramPacket(msg, msg.length);
		//没有连接过程，世界接收信息，放入dacket中，即msg中
		DatagramSocket udpSocket = new DatagramSocket(9999);
		udpSocket.receive(dPacket);
		String str = new String(dPacket.getData());

client端

		String msg ="csdn";
		DatagramSocket dSocket = new DatagramSocket(); 
		InetAddress local = InetAddress.getByName("localhost");
		DatagramPacket dPacket = new DatagramPacket(msg.getBytes(),msg.length(),
				local, 9999);
		dSocket.send(dPacket);

三，Http

Android中提供的HttpURLConnection和HttpClient接口可以用来开发HTTP程序。无需像C#那样关心通信协议，直接使用给定的步骤，按部就班就可一了。

1. HttpURLConnection接口

首先需要明确的是，Http通信中的POST和GET请求方式的不同。GET可以获得静态页面，也可以把参数放在URL字符串后面，传递给服务器。而POST方法的参数是放在Http请求中。因此，在编程之前，应当首先明确使用的请求方法，然后再根据所使用的方式选择相应的编程方式。
HttpURLConnection是继承于URLConnection类，二者都是抽象类。其对象主要通过URL的openConnection方法获得。创建方法如下代码所示：

URL url=new URL("https://ajax.googleapis.com/ajax/services/search/news?v=1.0&q=csdn");
HttpURLConnection urlConn=(HttpURLConnection)url.openConnection(); 
//设置输入和输出流  
urlConn.setDoInput(true);  
urlConn.connect();
//得到读取的内容(流)  
InputStreamReader in = new InputStreamReader(urlConn.getInputStream());  
// 为输出创建BufferedReader  
BufferedReader buffer = new BufferedReader(in);  

//使用循环来读取获得的数据  
String inputLine = null;
while (((inputLine = buffer.readLine()) != null))  
{  
    resultData.append(inputLine);
}           
//关闭InputStreamReader  
in.close();  
//关闭http连接  
urlConn.disconnect();

2.HttpClient接口

GET方法

// http地址  
String httpUrl = "http://192.168.1.110:8080/httpget.jsp?par=HttpClient_android_Get";  
//HttpGet连接对象  
HttpGet httpRequest = new HttpGet(httpUrl);  
 //取得HttpClient对象  
    HttpClient httpclient = new DefaultHttpClient();  
    //请求HttpClient，取得HttpResponse  
    HttpResponse httpResponse = httpclient.execute(httpRequest);  
    //请求成功  
    if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK)  
    {  
        //取得返回的字符串  
        String strResult = EntityUtils.toString(httpResponse.getEntity());  
        mTextView.setText(strResult);  
    }  
    else 
    {  
        mTextView.setText("请求错误!");  
    }

POST方法

//http地址  
String httpUrl = "http://192.168.1.110:8080/httpget.jsp";  
//HttpPost连接对象  
HttpPost httpRequest = new HttpPost(httpUrl);  
//使用NameValuePair来保存要传递的Post参数  
List<NameValuePair> params = new ArrayList<NameValuePair>();  
//添加要传递的参数  
params.add(new BasicNameValuePair("par", "HttpClient_android_Post"));  
//设置字符集  
HttpEntity httpentity = new UrlEncodedFormEntity(params, "gb2312");  
//请求httpRequest  
httpRequest.setEntity(httpentity);  
//取得默认的HttpClient  
HttpClient httpclient = new DefaultHttpClient();  
//取得HttpResponse  
HttpResponse httpResponse = httpclient.execute(httpRequest);  
//HttpStatus.SC_OK表示连接成功  
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK)  
{  
    //取得返回的字符串  
    String strResult = EntityUtils.toString(httpResponse.getEntity());  
    mTextView.setText(strResult);  
}  
else 
{  
    mTextView.setText("请求错误!");  
}