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();
}
}