Android 提交数据到服务器

2019-11-08 01:34:29

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前几篇博客都是说怎么从服务器里拿数据，今天就讲讲怎么提交数据到服务器上。大致有两种方式，一种是底层做法，GETPOST方法；还有一种是第三方asynchttpclient框架

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:orientation="vertical"> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/et_main_uname" android:hint="请输入用户名：" /> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/et_main_upass" android:hint="请输入密码：" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="登录(GET)" android:onClick="loginGET" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="登录(POST)" android:onClick="loginPOST" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="登录(AsyncHttpClient)" android:onClick="loginAsyncHttpClient" /></LinearLayout>

一、底层做法： 1、get方法和post方法

public void loginGET(View view){ String uname=et_main_uname.getText().toString(); String upass=et_main_upass.getText().toString(); new MyTask().execute(uname,upass,"GET"); } public void loginPOST(View view){ String uname=et_main_uname.getText().toString(); String upass=et_main_upass.getText().toString(); new MyTask().execute(uname,upass,"POST"); }

因为这是一个耗时操作，所以必须写在子线程内：

class MyTask extends AsyncTask{ PRivate URL url; private HttpURLConnection connection; @Override protected Object doInBackground(Object[] objects) { String uname=objects[0].toString(); String upass=objects[1].toString(); String type=objects[2].toString(); try { if("GET".equals(type)){ //用GET方式请求 url = new URL("http://193.168.3.134:8080/datatoclient/loginActionlogin.action?uname="+uname+"&upass="+upass); Log.i("test","get方式"); }else if("POST".equals(type)){ Log.i("test","post方式"); //用POST方式请求 url = new URL("http://193.168.3.134:8080/datatoclient/loginActionlogin.action"); } connection = (HttpURLConnection) url.openConnection(); connection.setRequestMethod(type); connection.setConnectTimeout(5000); if("POST".equals(type)){ //设置可以允许对外输出数据 connection.setDoOutput(true); String str="uname="+uname+"&upass="+upass; //添加请求头 //Content-Length:24 connection.setRequestProperty("Content-Length",""+str.length()); //Content-Type:application/x-www-form-urlencoded connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded"); //将内容提交到服务器 connection.getOutputStream().write(str.getBytes()); } if(connection.getResponseCode()==200){ InputStream is= connection.getInputStream(); BufferedReader br=new BufferedReader(new InputStreamReader(is)); String str=br.readLine(); return str; // } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; } @Override protected void onPreExecute() { super.onPreExecute(); } //更新UI @Override protected void onPostExecute(Object o) { super.onPostExecute(o); String s= (String) o; if("success".equals(s.trim())){ Toast.makeText(MainActivity.this, "跳转到主界面", Toast.LENGTH_SHORT).show(); }else{ Toast.makeText(MainActivity.this, "用户名或密码错误", Toast.LENGTH_SHORT).show(); } //创建时间修改时间 }}

get和post方法都可以提交数据到服务器，那么到底它们有什么区别呢？ a、get方式提交，参数直接带入路径中 b、post不用带入路径，而且有两个特殊的属性：

//添加请求头 //Content-Length:24 connection.setRequestProperty("Content-Length",""+str.length()); //Content-Type:application/x-www-form-urlencoded connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");

c、而且还要设置可以允许对外输出数据：connection.setDoOutput(true); 二、第三方asynchttpclient

public void loginAsyncHttpClient(View view){ String uname=et_main_uname.getText().toString(); String upass=et_main_upass.getText().toString(); AsyncHttpClient asyncHttpClient=new AsyncHttpClient(); RequestParams params=new RequestParams(); params.put("uname",uname); params.put("upass",upass);// Ctrl+H// ResponseHandlerInterface asyncHttpClient.post("http://193.168.3.134:8080/G150725_S2SH/loginActionlogin.action",params,new TextHttpResponseHandler(){ @Override public void onSuccess(int statusCode, org.apache.http.Header[] headers, String responseBody) { super.onSuccess(statusCode, headers, responseBody); Toast.makeText(MainActivity.this, ""+responseBody, Toast.LENGTH_SHORT).show(); } @Override public void onFailure(int statusCode, org.apache.http.Header[] headers, String responseBody, Throwable error) { super.onFailure(statusCode, headers, responseBody, error); } }); }

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