Android 获取网页上数据的三种方式

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; 
 }