转载 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。

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001    //第一种
002    /**获取参数(ArrayList<NameValuePair> nameValuePairs,String url)后post给远程服务器
003     * 将获得的返回结果(String)返回给调用者
004     * 本函数适用于查询数量较少的时候
005     * Chen.Zhidong
006     * 2011-02-15*/
007    public String posturl(ArrayList<NameValuePair> nameValuePairs,String url){
008        String result = "";
009        String tmp= "";
010        InputStream is = null;
011        try{
012            HttpClient httpclient = new DefaultHttpClient();
013            HttpPost httppost = new HttpPost(url);
014            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
015            HttpResponse response = httpclient.execute(httppost);
016            HttpEntity entity = response.getEntity();
017            is = entity.getContent();
018        }catch(Exception e){
019            return "Fail to establish http connection!";
020        }
021     
022        try{
023            BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf-8"));
024            StringBuilder sb = new StringBuilder();
025            String line = null;
026            while ((line = reader.readLine()) != null) {
027                sb.append(line + "\n");
028            }
029            is.close();
030     
031            tmp=sb.toString();
032        }catch(Exception e){
033            return "Fail to convert net stream!";
034        }
035     
036        try{
037            JSONArray jArray = new JSONArray(tmp);
038            for(int i=0;i<jArray.length();i++){
039                JSONObject json_data = jArray.getJSONObject(i);
040                Iterator<?> keys=json_data.keys();
041                while(keys.hasNext()){
042                    result += json_data.getString(keys.next().toString());
043                }
044            }
045        }catch(JSONException e){
046            return "The URL you post is wrong!";
047        }
048     
049        return result;
050    }
051     
052    //第二种
053    /**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
054     * 返回String
055     * Chen.Zhidong
056     * 2011-02-15*/
057    public String posturl(String url){
058        InputStream is = null;
059        String result = "";
060     
061        try{
062            HttpClient httpclient = new DefaultHttpClient();
063            HttpPost httppost = new HttpPost(url);
064            HttpResponse response = httpclient.execute(httppost);
065            HttpEntity entity = response.getEntity();
066            is = entity.getContent();
067        }catch(Exception e){
068            return "Fail to establish http connection!"+e.toString();
069        }
070     
071        try{
072            BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf-8"));
073            StringBuilder sb = new StringBuilder();
074            String line = null;
075            while ((line = reader.readLine()) != null) {
076                sb.append(line + "\n");
077            }
078            is.close();
079     
080            result=sb.toString();
081        }catch(Exception e){
082            return "Fail to convert net stream!";
083        }
084     
085        return result;
086    }
087     
088    //第三种
089    /**获取指定地址的网页数据
090     * 返回数据流
091     * Chen.Zhidong
092     * 2011-02-18*/
093    public InputStream streampost(String remote_addr){
094        URL infoUrl = null;
095        InputStream inStream = null;
096        try {
097            infoUrl = new URL(remote_addr);
098            URLConnection connection = infoUrl.openConnection();
099            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    }