Android平台有三种网络接口可以使用.doc

Android平台有三种网络接口可以使用，他们分别是：.*(标准Java接口)、Org.apache接口和A.*(Android网络接口)。下面分别介绍这些接口的功能和作用。1.标准Java接口.*提供与联网有关的类，包括流、数据包套接字(socket)、Internet协议、常见Http处理等。比如：创建URL，以及URLConnection/HttpURLConnection对象、设置链接参数、链接到服务器、向服务器写数据、从服务器读取数据等通信。这些在Java网络编程中均有涉及，我们看一个简单的socket编程，实现服务器回发客户端信息。服务端：public class Server implements Runnable Override public void run() Socket socket = null; try ServerSocket server = new ServerSocket(18888); /循环监听客户端链接请求 while(true) System.out.println(start.); /接收请求 socket = server.accept(); System.out.println(accept.); /接收客户端消息 BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream(); String message = in.readLine(); /发送消息，向客户端 PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),true); out.println(Server: + message); /关闭流 in.close(); out.close(); catch (IOException e) e.printStackTrace(); finally if (null != socket) try socket.close(); catch (IOException e) e.printStackTrace(); /启动服务器 public static void main(String args) Thread server = new Thread(new Server(); server.start(); 客户端，MainActivitypublic class MainActivity extends Activity private EditText editText; private Button button; /* Called when the activity is first created. */ Override public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.main); editText = (EditText)findViewById(R.id.editText1); button = (Button)findViewById(R.id.button1); button.setOnClickListener(new OnClickListener() Override public void onClick(View v) Socket socket = null; String message = editText.getText().toString()+ rn ; try /创建客户端socket,注意:不能用localhost或，Android模拟器把自己作为localhost socket = new Socket(,18888); PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter (socket.getOutputStream(),true); /发送数据 out.println(message); /接收数据 BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream(); String msg = in.readLine(); if (null != msg) editText.setText(msg); System.out.println(msg); else editText.setText(data error); out.close(); in.close(); catch (UnknownHostException e) e.printStackTrace(); catch (IOException e) e.printStackTrace(); finally try if (null != socket) socket.close(); catch (IOException e) e.printStackTrace(); ); 布局文件： 启动服务器：javac com/test/socket/Server.javajava com.test.socket.Server运行客户端程序：结果如图：注意：服务器与客户端无法链接的可能原因有：没有加访问网络的权限：IP地址要使用：模拟器不能配置代理。2。Apache接口对于大部分应用程序而言JDK本身提供的网络功能已远远不够，这时就需要Android提供的Apache HttpClient了。它是一个开源项目，功能更加完善，为客户端的Http编程提供高效、最新、功能丰富的工具包支持。下面我们以一个简单例子来看看如何使用HttpClient在Android客户端访问Web。首先，要在你的机器上搭建一个web应用myapp，只有很简单的一个http.jsp内容如下：Http Test%String type = request.getParameter(parameter);String result = new String(type.getBytes(iso-8859-1),utf-8);out.println( + result + );%然后实现Android客户端，分别以post、get方式去访问myapp,代码如下：布局文件：资源文件：strings.xml 通过按钮选择不同方式访问网页 Http Get主Activity:public class MainActivity extends Activity private TextView textView; private Button get,post; /* Called when the activity is first created. */ Override public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.main); textView = (TextView)findViewById(R.id.textView); get = (Button)findViewById(R.id.get); post = (Button)findViewById(R.id.post); /绑定按钮监听器 get.setOnClickListener(new OnClickListener() Override public void onClick(View v) /注意：此处ip不能用或localhost,Android模拟器已将它自己作为了localhost String uri = 8:8080/myapp/http.jsp?parameter=以Get方式发送请求; textView.setText(get(uri); ); /绑定按钮监听器 post.setOnClickListener(new OnClickListener() Override public void onClick(View v) String uri = 8:8080/myapp/http.jsp; textView.setText(post(uri); ); /* * 以get方式发送请求，访问web * param uri web地址 * return 响应数据 */ private static String get(String uri) BufferedReader reader = null; StringBuffer sb = null; String result = ; HttpClient client = new DefaultHttpClient(); HttpGet request = new HttpGet(uri); try /发送请求，得到响应 HttpResponse response = client.execute(request); /请求成功 if (response.getStatusLine().getStatusCode() = HttpStatus.SC_OK) reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(); sb = new StringBuffer(); String line = ; String NL = System.getProperty(line.separator); while(line = reader.readLine() != null) sb.append(line); catch (ClientProtocolException e) e.printStackTrace(); catch (IOException e) e.printStackTrace(); finally try if (null != reader) reader.close(); reader = null; catch (IOException e) e.printStackTrace(); if (null != sb) result =sb.toString(); return result; /* * 以post方式发送请求，访问web * param uri web地址 * return 响应数据 */ private static String post(String uri) BufferedReader reader = null; StringBuffer sb = null; String result = ; HttpClient client = new DefaultHttpClient(); HttpPost request = new HttpPost(uri); /保存要传递的参数 List params = new ArrayList(); /添加参数 params.add(new BasicNameValuePair(parameter,以Post方式发送请求); try /设置字符集 HttpEntity entity = new UrlEncodedFormEntity(params,utf-8); /请求对象 request.setEntity(entity); /发送请求 HttpResponse response = client.execute(request); /请求成功 if (response.getStatusLine().getStatusCode() = HttpStatus.SC_OK) System.out.println(post success); reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(); sb = new StringBuffer(); String line = ; String NL = System.getProperty(line.separator); while(line = reader.readLine() != null) s