以HttpGet方法获取URL数据并转换成指定编码格式的字符串

	/***
	 * 
	 * 以HttpGet方法获取URL数据并转换成指定编码格式的字符串
	 * @param url			url
	 * @param charset		字符编码,默认为UTF-8编码
	 * @return
	 * @throws ParseException
	 * @throws ClientProtocolException
	 * @throws IOException
	 */
	public String getStringContent(String url, String charset) throws ParseException, ClientProtocolException, IOException{
		
		if( charset == null || charset.equals("") ){
			return EntityUtils.toString( getHttpEntity( url ), HTTP.UTF_8 );
		} else {
			return EntityUtils.toString( getHttpEntity( url ), charset);
		}
	}
	
	public static HttpEntity getHttpEntity(String url) throws ClientProtocolException, IOException {
		HttpParams params = new BasicHttpParams();
		HttpConnectionParams.setSoTimeout(params, 3000);
		HttpConnectionParams.setConnectionTimeout(params, 3000);
		HttpClient client = new DefaultHttpClient(params);
		HttpGet get = new HttpGet(url);
		HttpResponse httpResponse = client.execute(get);
		
		if(httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
			return httpResponse.getEntity();
		}
		return null;
	}