Android 三种获取页面数据方法

 

 

/**获取参数(ArrayList<NameValuePair> nameValuePairs,String url)后
 *  post给远程服务器 
 *  将获得的返回结果(String)返回给调用者 
 *  本函数适用于查询数量较少的时候 
 *  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; 
} 

 

/**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 
 *  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; 
} 

 

/**获取指定地址的网页数据 
 *  返回数据流 
 *  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; 
}