Android擷取網頁資料的方法總結

來源:互聯網
上載者:User

本文總結了三種擷取網頁資料的代碼,是自己在用的時候隨手整理出來的。此處僅貼出函數段,不貼出import了,用的時候可以用eclipse自動import一下就行了。函數的詳細用途描述請看代碼中注釋。調用的時候請對應函數需要的參數。

//第一種/**擷取參數(ArrayList<NameValuePair> nameValuePairs,String url)後post給遠程伺服器 * 將獲得的返回結果(String)返回給調用者 * 本函數適用於查詢數量較少的時候 * Chen.Zhidong * 2011-02-15*/public String posturl(ArrayList<NameValuePair> nameValuePairs,String url){    String result = "";    String tmp= "";    InputStream is = null;    try{        HttpClient httpclient = new DefaultHttpClient();        HttpPost httppost = new HttpPost(url);        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));        HttpResponse response = httpclient.execute(httppost);        HttpEntity entity = response.getEntity();        is = entity.getContent();    }catch(Exception e){        return "Fail to establish http connection!";    }    try{        BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf-8"));        StringBuilder sb = new StringBuilder();        String line = null;        while ((line = reader.readLine()) != null) {            sb.append(line + "\n");        }        is.close();        tmp=sb.toString();    }catch(Exception e){        return "Fail to convert net stream!";    }    try{        JSONArray jArray = new JSONArray(tmp);        for(int i=0;i<jArray.length();i++){            JSONObject json_data = jArray.getJSONObject(i);            Iterator<?> keys=json_data.keys();            while(keys.hasNext()){                result += json_data.getString(keys.next().toString());            }        }    }catch(JSONException e){        return "The URL you post is wrong!";    }    return result;}//第二種/**擷取參數指定的網頁代碼,將其返回給調用者,由調用者對其解析 * 返回String * Chen.Zhidong * 2011-02-15*/public String posturl(String url){    InputStream is = null;    String result = "";    try{        HttpClient httpclient = new DefaultHttpClient();        HttpPost httppost = new HttpPost(url);        HttpResponse response = httpclient.execute(httppost);        HttpEntity entity = response.getEntity();        is = entity.getContent();    }catch(Exception e){        return "Fail to establish http connection!"+e.toString();    }    try{        BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf-8"));        StringBuilder sb = new StringBuilder();        String line = null;        while ((line = reader.readLine()) != null) {            sb.append(line + "\n");        }        is.close();        result=sb.toString();    }catch(Exception e){        return "Fail to convert net stream!";    }    return result;}//第三種/**擷取指定地址的網頁資料 * 返回資料流 * Chen.Zhidong * 2011-02-18*/public InputStream streampost(String remote_addr){    URL infoUrl = null;    InputStream inStream = null;    try {        infoUrl = new URL(remote_addr);        URLConnection connection = infoUrl.openConnection();        HttpURLConnection httpConnection = (HttpURLConnection)connection;        int responseCode = httpConnection.getResponseCode();        if(responseCode == HttpURLConnection.HTTP_OK){            inStream = httpConnection.getInputStream();        }    } catch (MalformedURLException e) {        // TODO Auto-generated catch block        e.printStackTrace();    } catch (IOException e) {        // TODO Auto-generated catch block        e.printStackTrace();    }    return inStream;}
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