Android获取网页数据的方法总结

本文总结了三种获取网页数据的代码。

/**************** 第一种
 ****************/
/* 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
*/
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(newUrlEncodedFormEntity(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(newInputStreamReader(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(inti=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;
}
 
/***********************   第二种   *********************/
/*  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
*/
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(newInputStreamReader(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;
}
 
/*************** 第三种 *****************/
/** 获取指定地址的网页数据
 *  返回数据流 
*/
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;
        intresponseCode = 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();
    }
    returninStream;
}
摘自 虚怀若谷