http通信,以xml或者json为载体,相互通信数据。
Android对于http的网络通信,提供了标准的java接口——httpURLConnection接口,以及apache的接口——httpclient接口。其中我自己用的比较多的而是httpclient这个接口,因为它的功能更为丰富很有效。
同时http通信也分为post方式和get的方式,两个相比较的话,post传送的数据量比较大,安全性也比较高。因此在做数据查询时,我会用get方式;而在做数据添加、修改或删除时,我就用Post方式
以下是基于httpclient接口,用get和post的方式通信的代码。
(get方式)
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.login); TextView text = (TextView) this.findViewById(R.id.text_http); String httpurl = “http://10.0.2.2:8080/SIM_SERVER/org/Org-list”; //①httpget连接对象 HttpGet httpRequest = new HttpGet(httpurl); //②取得httpclient的对象 HttpClient httpclient = new DefaultHttpClient(); try { //③请求httpclient,取得httpResponse HttpResponse httpResponse = httpclient.execute(httpRequest); //④判断请求是否成功 if(httpResponse.getStatusLine().getStatusCode()==HttpStatus.SC_OK){ //⑤取得返回的字符串 String strResult = EntityUtils.toString(httpResponse.getEntity()); text.setText(strResult); }else{ text.setText(“请求失败”); } } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } (post方式) protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.setContentView(R.layout.login); TextView text = (TextView) this.findViewById(R.id.text_http); //①http连接地址 String url = “http://10.0.2.2:8080/SIM_SERVER/and/Android-test”; //②取得httppost连接对象 HttpPost httpPost = new HttpPost(url); //③使用NameValuePair来保存要传递的Post参数 List<NameValuePair> params = new ArrayList<NameValuePair>(); //④添加要传递的参数 params.add(new BasicNameValuePair(“parentId”, “0″)); HttpEntity httpentity; try { //⑤设置字符集 httpentity = new UrlEncodedFormEntity(params, “utf-8″); //⑥把字符集设置在请求request里面 httpPost.setEntity(httpentity); //⑦取得httpclient HttpClient httpClient = new DefaultHttpClient(); //⑧请求发送,并获得response HttpResponse httpResponse = httpClient.execute(httpPost); //⑨判断请求是否成功 if(httpResponse.getStatusLine().getStatusCode()==HttpStatus.SC_OK){ //⑩取得返回字符串 String strResult = EntityUtils.toString(httpResponse.getEntity()); text.setText(strResult); }else{ text.setText(“请求失败”); } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }