Android平臺有三種網絡接口可以使用，他們分別是：java.net.*(標準Java接口)、Org.apache接口和Android.net.*(Android網絡接口)。下面分別介紹這些接口的功能和作用。
1.標準Java接口
java.net.*提供與聯網有關的類，包括流、數據包套接字(socket)、Internet協議、常見Http處理等。比如：創建URL，以及URLConnection/HttpURLConnection對象、設置鏈接參數、鏈接到服務器、向服務器寫數據、從服務器讀取數據等通信。這些在Java網絡編程中均有涉及，我們看一個簡單的socket編程，實現服務器回發客戶端信息。
服務端：

[java]?view plaincopy

public?class?Server?implements?Runnable{??

????@Override??

????public?void?run()?{??

????????Socket?socket?=?null;??

????????try?{??

????????????ServerSocket?server?=?new?ServerSocket(18888);??

????????????//循環監聽客戶端鏈接請求??

????????????while(true){??

????????????????System.out.println("start...");??

????????????????//接收請求??

????????????????socket?=?server.accept();??

????????????????System.out.println("accept...");??

????????????????//接收客戶端消息??

????????????????BufferedReader?in?=?new?BufferedReader(new?InputStreamReader(socket.getInputStream()));??

????????????????String?message?=?in.readLine();??

????????????????//發送消息，向客戶端??

????????????????PrintWriter?out?=?new?PrintWriter(new?BufferedWriter(new?OutputStreamWriter(socket.getOutputStream())),true);??

????????????????out.println("Server:"?+?message);??

????????????????//關閉流??

????????????????in.close();??

????????????????out.close();??

????????????}??

????????}?catch?(IOException?e)?{??

????????????e.printStackTrace();??

????????}finally{??

????????????if?(null?!=?socket){??

????????????????try?{??

????????????????????socket.close();??

????????????????}?catch?(IOException?e)?{??

????????????????????e.printStackTrace();??

????????????????}??

????????????}??

????????}??

??????????

????}??

????//啟動服務器??

????public?static?void?main(String[]?args){??

????????Thread?server?=?new?Thread(new?Server());??

????????server.start();??

????}??

}??

客戶端，MainActivity

[java]?view plaincopy

public?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()+?"\r\n"?;??

????????????????try?{??

????????????????????//創建客戶端socket,注意:不能用localhost或127.0.0.1，Android模擬器把自己作為localhost??

????????????????????socket?=?new?Socket("<span?style="font-weight:?bold;">10.0.2.2</span>",18888);??

????????????????????PrintWriter?out?=?new?PrintWriter(new?BufferedWriter(new?OutputStreamWriter??

????????????????????????????(socket.getOutputStream())),true);??

????????????????????//發送數據??

????????????????????out.println(message);??

??????????????????????

????????????????????//接收數據??

????????????????????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：

[java]?view plaincopy

<?xml?version="1.0"?encoding="utf-8"?>??

<LinearLayout?xmlns:android="http://schemas.android.com/apk/res/android"??

????android:orientation="vertical"?android:layout_width="fill_parent"??

????android:layout_height="fill_parent">??

????<TextView?android:layout_width="fill_parent"??

????????android:layout_height="wrap_content"?android:text="@string/hello"?/>??

????<EditText?android:layout_width="match_parent"?android:id="@+id/editText1"??

????????android:layout_height="wrap_content"??

????????android:hint="input?the?message?and?click?the?send?button"??

????????></EditText>??

????<Button?android:text="send"?android:id="@+id/button1"??

????????android:layout_width="fill_parent"?android:layout_height="wrap_content"></Button>??

</LinearLayout>??

啟動服務器：

[java]?view plaincopy

javac?com/test/socket/Server.java??

java?com.test.socket.Server??

運行客戶端程序：

結果如圖：

注意：服務器與客戶端無法鏈接的可能原因有：
沒有加訪問網絡的權限：<uses-permission android:name="android.permission.INTERNET"></uses-permission>
IP地址要使用：10.0.2.2
模擬器不能配置代理。

2。Apache接口
對于大部分應用程序而言JDK本身提供的網絡功能已遠遠不夠，這時就需要Android提供的Apache HttpClient了。它是一個開源項目，功能更加完善，為客戶端的Http編程提供高效、最新、功能豐富的工具包支持。
下面我們以一個簡單例子來看看如何使用HttpClient在Android客戶端訪問Web。
首先，要在你的機器上搭建一個web應用myapp，只有很簡單的一個http.jsp
內容如下：

[java]?view plaincopy

<%@page?language="java"?import="java.util.*"?pageEncoding="utf-8"%>??

<html>??

<head>??

<title>??

Http?Test??

</title>??

</head>??

<body>??

<%??

String?type?=?request.getParameter("parameter");??

String?result?=?new?String(type.getBytes("iso-8859-1"),"utf-8");??

out.println("<h1>"?+?result?+?"</h1>");??

%>??

</body>??

</html>??

然后實現Android客戶端，分別以post、get方式去訪問myapp,代碼如下：
布局文件：

[java]?view plaincopy

<?xml?version="1.0"?encoding="utf-8"?>??

<LinearLayout?xmlns:android="http://schemas.android.com/apk/res/android"??

????android:orientation="vertical"??

????android:layout_width="fill_parent"??

????android:layout_height="fill_parent"??

????>??

<TextView??

????android:gravity="center"??

????android:id="@+id/textView"????

????android:layout_width="fill_parent"??

????android:layout_height="wrap_content"??

????android:text="@string/hello"??

????/>??

<Button?android:text="get"?android:id="@+id/get"?android:layout_width="match_parent"?android:layout_height="wrap_content"></Button>??

<Button?android:text="post"?android:id="@+id/post"?android:layout_width="match_parent"?android:layout_height="wrap_content"></Button>??

</LinearLayout>??

資源文件：
strings.xml

[java]?view plaincopy

<?xml?version="1.0"?encoding="utf-8"?>??

<resources>??

????<string?name="hello">通過按鈕選擇不同方式訪問網頁</string>??

????<string?name="app_name">Http?Get</string>??

</resources>??

主Activity:

[java]?view plaincopy

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);??

??????????

????????//綁定按鈕監聽器??

????????get.setOnClickListener(new?OnClickListener()?{??

????????????@Override??

????????????public?void?onClick(View?v)?{??

????????????????//注意：此處ip不能用127.0.0.1或localhost,Android模擬器已將它自己作為了localhost??

????????????????String?uri?=?"http://192.168.22.28:8080/myapp/http.jsp?parameter=以Get方式發送請求";??

????????????????textView.setText(get(uri));??

????????????}??

????????});??

????????//綁定按鈕監聽器??

????????post.setOnClickListener(new?OnClickListener()?{??

????????????@Override??

????????????public?void?onClick(View?v)?{??

????????????????String?uri?=?"http://192.168.22.28:8080/myapp/http.jsp";??

????????????????textView.setText(post(uri));??

????????????}??

????????});??

????}??

????/**?

?????*?以get方式發送請求，訪問web?

?????*?@param?uri?web地址?

?????*?@return?響應數據?

?????*/??

????private?static?String?get(String?uri){??

????????BufferedReader?reader?=?null;??

????????StringBuffer?sb?=?null;??

????????String?result?=?"";??

????????HttpClient?client?=?new?DefaultHttpClient();??

????????HttpGet?request?=?new?HttpGet(uri);??

????????try?{??

????????????//發送請求，得到響應??

????????????HttpResponse?response?=?client.execute(request);??

??????????????

????????????//請求成功??

????????????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方式發送請求，訪問web?

?????*?@param?uri?web地址?

?????*?@return?響應數據?

?????*/??

????private?static?String?post(String?uri){??

????????BufferedReader?reader?=?null;??

????????StringBuffer?sb?=?null;??

????????String?result?=?"";??

????????HttpClient?client?=?new?DefaultHttpClient();??

????????HttpPost?request?=?new?HttpPost(uri);??

??????????

????????//保存要傳遞的參數??

????????List<NameValuePair>?params?=?new?ArrayList<NameValuePair>();??

????????//添加參數??

????????params.add(new?BasicNameValuePair("parameter","以Post方式發送請求"));??

??????????

????????try?{??

????????????//設置字符集??

????????????HttpEntity?entity?=?new?UrlEncodedFormEntity(params,"utf-8");??

????????????//請求對象??

????????????request.setEntity(entity);??

????????????//發送請求??

????????????HttpResponse?response?=?client.execute(request);??

??????????????

????????????//請求成功??

????????????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){??

????????????????????sb.append(line);??

????????????????}??

????????????}??

????????}?catch?(ClientProtocolException?e)?{??

????????????e.printStackTrace();??

????????}?catch?(IOException?e)?{??

????????????e.printStackTrace();??

????????}??

????????finally{??

????????????try?{??

????????????????//關閉流??

????????????????if?(null?!=?reader){??

????????????????????reader.close();??

????????????????????reader?=?null;??

????????????????}??

????????????}?catch?(IOException?e)?{??

????????????????e.printStackTrace();??

????????????}??

????????}??

????????if?(null?!=?sb){??

????????????result?=??sb.toString();??

????????}??

????????return?result;??

????}??

}??

運行結果如下：

3.android.net編程：
常常使用此包下的類進行Android特有的網絡編程，如：訪問WiFi，訪問Android聯網信息，郵件等功能。這里不詳細講。

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