网络编程（一）

get 方法实例：

    String url="http://202.194.14.215/iactivity/mobile/msg.php?act=1";
			String tixingfanhuizhi=null;

			DefaultHttpClient client=new DefaultHttpClient();//新建client
			HttpGet get=new HttpGet(url); //新建httpget

			HttpResponse response=null;

			get.setHeader("Cookie",getCookie());//setcookie，有的时候可能用不到
			response=client.execute(get);

			tixingfanhuizhi = EntityUtils.toString(response.getEntity(), "UTF-8");
			Document doc=Jsoup.parse(tixingfanhuizhi);//将string返回值生成document文件，然后就可以用Jsoup解析Html文件了
			Elements pinglun=doc.select("div");
			int a=pinglun.size();

post方法实例		DefaultHttpClient httpclient = new DefaultHttpClient();//创建httpclient

		List<NameValuePair> params = new ArrayList<NameValuePair>();
		params.add(new BasicNameValuePair("user", username));
		params.add(new BasicNameValuePair("key", key));
		UrlEncodedFormEntity entity = null;
		try {
			entity = new UrlEncodedFormEntity(params, "UTF-8");
			HttpPost httppost = new HttpPost(url);
			httppost.setEntity(entity); //用post方法，里面放置参数
			try {
				response = httpclient.execute(httppost);//获得httpresponse
				Header header = response.getFirstHeader("Set-Cookie");
				if (header != null) {
					    httpcookie = header.getValue();

				}
				try {
					fanhuishuzhi = EntityUtils.toString(response.getEntity(),
							HTTP.UTF_8); //获得其中的内容

					code = Integer.parseInt(fanhuishuzhi);//转换为数据值
				} catch (ParseException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
					Toast.makeText(getApplicationContext(),getResources()
							.getString(R.string.login_no), Toast.LENGTH_SHORT).show();
					dialog.dismiss();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
					Toast.makeText(getApplicationContext(),getResources()
							.getString(R.string.login_no), Toast.LENGTH_SHORT).show();
					dialog.dismiss();
				}
			} catch (ClientProtocolException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
				Toast.makeText(getApplicationContext(),getResources()
						.getString(R.string.login_no), Toast.LENGTH_SHORT).show();
				dialog.dismiss();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();

			}

		} catch (UnsupportedEncodingException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();

		}