android如何获取网页数据

1、首先在AndroidManifest中加入Internet权限: 1.<!-- 访问网络的权限 -->   2. <uses-permission Android:name="android.permission.INTERNET"/>     Activity中得代码如下 1.public class GetHtmlCodeActivity extends Activity {   2.    @Override   3.    public void onCreate(Bundle savedInstanceState) {  4.        super.onCreate(savedInstanceState);   5.        setContentView(R.layout.main);   6.           7.        TextView textView = (TextView)this.findViewById(R.id.picture_textview);   8.        try {   9.            textView.setText(getPictureData("http://www.facebook4covers.com"));   10.        } catch (Exception e) {   11.            Log.e("GetHtmlCodeActivity", e.toString());   12.            Toast.makeText(GetHtmlCodeActivity.this, "网络连接失败", 1).show();   13.        }   14.    }   15.    //得到图片的二进制数据    16.    public String getPictureData(String path) throws Exception{   17.        // 类 URL 代表一个统一资源定位符，它是指向互联网“资源”的指针。    18.        URL url = new URL("http://www.lewfree.com/");   19.        // 每个 HttpURLConnection 实例都可用于生成单个请求，    20.        //但是其他实例可以透明地共享连接到 HTTP 服务器的基础网络    21.        HttpURLConnection conn = (HttpURLConnection) url.openConnection();   22.        //设置 URL 请求的方法    23.        conn.setRequestMethod("GET");   24.        //设置一个指定的超时值（以毫秒为单位），    25.        //该值将在打开到此 URLConnection 引用的资源的通信链接时使用。    26.        conn.setConnectTimeout(5 * 1000);   27.        // conn.getInputStream()返回从此打开的连接读取的输入流    28.        InputStream inStream = conn.getInputStream();// 通过输入流获取html数据    29.        byte[] data = readInputStream(inStream);// 得到html的二进制数据    30.        String html = new String(data);   31.        return html;   32.           33.    }   34.    //读取输入流中的数据，返回字节数组byte[]    35.    public byte[] readInputStream(InputStream inStream) throws Exception{   36.        //此类实现了一个输出流，其中的数据被写入一个 byte 数组    37.        ByteArrayOutputStream outStream = new ByteArrayOutputStream();   38.        // 字节数组    39.        byte[] buffer = new byte[1024];   40.        int len = 0;   41.        //从输入流中读取一定数量的字节，并将其存储在缓冲区数组buffer 中    42.        while ((len = inStream.read(buffer)) != -1) {   43.            // 将指定 byte 数组中从偏移量 off 开始的 len 个字节写入此输出流   44.            outStream.write(buffer, 0, len);   45.        }   46.        inStream.close();   47.        //toByteArray()创建一个新分配的 byte 数组。    48.        return outStream.toByteArray();   49.    }   50.}  

01.//第一种    02./**获取参数(ArrayList<NameValuePair> nameValuePairs,String url)后post给远程服务器  03. * 将获得的返回结果(String)返回给调用者  04. * 本函数适用于查询数量较少的时候  05. * Chen.Zhidong  06. * 2011-02-15*/  07.public String posturl(ArrayList<NameValuePair> nameValuePairs,String url){   08.    String result = "";   09.    String tmp= "";   10.    InputStream is = null;   11.    try{   12.        HttpClient httpclient = new DefaultHttpClient();   13.        HttpPost httppost = new HttpPost(url);   14.        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));   15.        HttpResponse response = httpclient.execute(httppost);   16.        HttpEntity entity = response.getEntity();   17.        is = entity.getContent();   18.    }catch(Exception e){   19.        return "Fail to establish http connection!";   20.    }   21.   22.    try{   23.        BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf-8"));   24.        StringBuilder sb = new StringBuilder();   25.        String line = null;   26.        while ((line = reader.readLine()) != null) {   27.            sb.append(line + "\n");   28.        }   29.        is.close();   30.   31.        tmp=sb.toString();   32.    }catch(Exception e){   33.        return "Fail to convert net stream!";   34.    }   35.   36.    try{   37.        JSONArray jArray = new JSONArray(tmp);   38.        for(int i=0;i<jArray.length();i++){   39.            JSONObject json_data = jArray.getJSONObject(i);   40.            Iterator<?> keys=json_data.keys();   41.            while(keys.hasNext()){   42.                result += json_data.getString(keys.next().toString());   43.            }   44.        }   45.    }catch(JSONException e){   46.        return "The URL you post is wrong!";   47.    }   48.   49.    return result;   50.}   51.   52.//第二种    53./**获取参数指定的网页代码，将其返回给调用者，由调用者对其解析  54. * 返回String  55. * Chen.Zhidong  56. * 2011-02-15*/  57.public String posturl(String url){   58.    InputStream is = null;   59.    String result = "";   60.   61.    try{   62.        HttpClient httpclient = new DefaultHttpClient();   63.        HttpPost httppost = new HttpPost(url);   64.        HttpResponse response = httpclient.execute(httppost);   65.        HttpEntity entity = response.getEntity();   66.        is = entity.getContent();   67.    }catch(Exception e){   68.        return "Fail to establish http connection!"+e.toString();   69.    }   70.   71.    try{   72.        BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf-8"));   73.        StringBuilder sb = new StringBuilder();   74.        String line = null;   75.        while ((line = reader.readLine()) != null) {   76.            sb.append(line + "\n");   77.        }   78.        is.close();   79.   80.        result=sb.toString();   81.    }catch(Exception e){   82.        return "Fail to convert net stream!";   83.    }   84.   85.    return result;   86.}   87.   88.//第三种    89./**获取指定地址的网页数据  90. * 返回数据流  91. * Chen.Zhidong  92. * 2011-02-18*/  93.public InputStream streampost(String remote_addr){   94.    URL infoUrl = null;   95.    InputStream inStream = null;   96.    try {   97.        infoUrl = new URL(remote_addr);   98.        URLConnection connection = infoUrl.openConnection();   99.        HttpURLConnection httpConnection = (HttpURLConnection)connection;   100.        int responseCode = httpConnection.getResponseCode();   101.        if(responseCode == HttpURLConnection.HTTP_OK){   102.            inStream = httpConnection.getInputStream();   103.        }   104.    } catch (MalformedURLException e) {   105.        // TODO Auto-generated catch block    106.        e.printStackTrace();   107.    } catch (IOException e) {   108.        // TODO Auto-generated catch block    109.        e.printStackTrace();   110.    }   111.    return inStream;   112.}