android的两种网络请求方式关键代码详解

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第一种，通过httpclient方式的异步加载过程

new AsyncTask<Void, Void, String>(){        @Override        protected String doInBackground(Void... params) {            try {                //创建一个网络连接                HttpClient client=new DefaultHttpClient();                //设置端口                HttpPost post=new HttpPost("http://172.88.134.132:8080/ems/addEmp");                post.setHeader("Content-Type", "appliction/x-www-form-urlencoded");                //获得而一个解析实体类(在这一步开始的异常)                List<NameValuePair> parameters=new ArrayList<NameValuePair>();                parameters.add(new BasicNameValuePair("name", emp.getName()));                parameters.add(new BasicNameValuePair("Salary", String.valueOf(emp.getSalary())));                parameters.add(new BasicNameValuePair("age", String.valueOf(emp.getAge())));                parameters.add(new BasicNameValuePair("gender", emp.getGender()));                HttpEntity entity=new UrlEncodedFormEntity(parameters);                //终于到了我们的请求响应                HttpResponse resp = client.execute(post);                //两种方法去解析我们的结果                //第一种

/* //获得返回的实体
HttpEntity respEntity = resp.getEntity();
//通过流的方式获得所有的
InputStream is=respEntity.getContent();
//自定义缓冲流按行去读
BufferedReader br=new BufferedReader(new InputStreamReader(is));
String line=br.readLine();
br.close();
*/ //第二种
String result=EntityUtils.toString(resp.getEntity());
return result;
} catch (Exception e) {
e.printStackTrace();
}

            return null;        }        @Override        protected void onPostExecute(String result) {            listener.onAddFinish(result);        }    }.execute();

第二种通过另启动一个线程，HttpURLConnection的连接

new Thread(){
@Override
public void run() {
try {
URL url=new URL(“http://172.88.134.132:8080/ems/regist.do“);
HttpURLConnection connection=(HttpURLConnection) url.openConnection();
//请求方式
connection.setRequestMethod(“POST”);
//接受服务器的响应
connection.setDoInput(true);
//向服务器提供数据
connection.setDoOutput(true);
//在请求头中为，请求的内容说明，设置请求n参数
connection.setRequestProperty(“Content-Type”, “application/x-www-form-urlencoded”);
connection.connect();
//客户端提交数据
OutputStream out = connection.getOutputStream();
PrintWriter pw=new PrintWriter(out,true);
// String params=”log”+user.getName()+”“+user.getPassword()+”“+user.getRealname()+”“+user.getEmail();
String params=getParams(user);
pw.print(params);
pw.close();
//从客户端获取服务器响应
InputStream in =connection.getInputStream();
BufferedReader br=new BufferedReader(new InputStreamReader(in));
final String result=br.readLine();
br.close();
//在主线程执行
new Handler(Looper.getMainLooper()).post(new Runnable() {
@Override
public void run() {
listener.onregistFinishlistener(result);
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
}.start();

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