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，是自己在用的时候随手整理出来的。此处仅贴出函数段，不贴出import了，用的时候可以用eclipse自动import一下就行了。函数的详细用途描述请看代码中注释。调用的时候请对应函数需要的参数。

    //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
     * 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
     * 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;
    }

    //第三种
    /**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;
    }