android 向服务器提交数据(get-post-AsyncHttpClient)

在Android中，提供了标准Java接口HttpURLConnection和Apache接口HttpClient，为客户端HTTP编程提供了丰富的支持。

　　在HTTP通信中使用最多的就是GET和POST了，GET请求可以获取静态页面，也可以把参数放在URL字符串的后面，传递给服务器。POST与GET的不同之处在于POST的参数不是放在URL字符串里面，而是放在HTTP请求数据中。

清单文件里面要加入网络权限

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

下面代码实例:

public class MainActivity extends AppCompatActivity {

private EditText et_main_uname;
private EditText et_main_upass;
private URL url;
private HttpURLConnection httpURLConnection;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

et_main_uname = (EditText) findViewById(R.id.et_main_uname);
et_main_upass = (EditText) findViewById(R.id.et_main_upass);
}

//使用get提交
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");
}

//使用post提交
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");
}

//使用第三方AsyncHttpClient提交
//HttpClient导致不可以问题,在Gradle android{}里面加入一个内库useLibrary 'org.apache.http.legacy'(复制进去即可)

public void loginAsyncHttpClient(View view){
String uname=et_main_uname.getText().toString();
String upass=et_main_upass.getText().toString();

AsyncHttpClient asyncHttpClient=new AsyncHttpClient();
RequestParams requestParames=new RequestParams();
requestParames.put("uname",uname);
requestParames.put("upass",upass);
asyncHttpClient.post("http://192.168.10.101:8080/androidData/doIndex.do",requestParames,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);
}
});

}

class MyTask extends AsyncTask{

@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://192.168.10.101:8080/androidData/doIndex.do?uname="+uname+"&upass="+upass);
Log.i("test","GET方式");
}else if("POST".equals(type)){
url=new URL("http://192.168.10.101:8080/androidData/doIndex.do");
Log.i("test","POST方式");
}
httpURLConnection = (HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod(type);
httpURLConnection.setConnectTimeout(5000);

if ("POST".equals(type)){
//设置可以允许对外输出数据
httpURLConnection.setDoOutput(true);
String str="uname="+uname+"&upass="+upass;
//添加请求头
//Content-Length:
httpURLConnection.setRequestProperty("Content-Length",""+str.length());
//Content-Type:application/x-www-form-urlencoded
httpURLConnection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
//将内容提交到服务器
httpURLConnection.getOutputStream().write(str.getBytes());

}
if (httpURLConnection.getResponseCode()==200){
InputStream inputStream=httpURLConnection.getInputStream();
BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(inputStream));
String str=bufferedReader.readLine();
return str;
}

} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

return null;
}

//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, "登录成功，正在跳转", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(MainActivity.this, "用户名或密码错误", Toast.LENGTH_SHORT).show();
}

}
}

}

xm代码:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main"
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"
tools:context="ghq.zking.com.ghq_android_31.MainActivity">
<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>

服务端准备:

public class SendDataServlet implements Servlet{

public void destroy() {
// TODO Auto-generated method stub

}

public ServletConfig getServletConfig() {
// TODO Auto-generated method stub
return null;
}

public String getServletInfo() {
// TODO Auto-generated method stub
return null;
}

public void init(ServletConfig arg0) throws ServletException {
// TODO Auto-generated method stub

}

public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub

String uname=request.getParameter("uname").trim();
String upass=request.getParameter("upass").trim();

String str=null;

if("admin".equals(uname)&&"upass".equals(upass)){
str="success";

}else{
str="failure";
}

System.out.println("用户名:"+uname+"密码:"+upass);

request.setAttribute("result", str);
request.getRequestDispatcher("result.jsp").forward(request, response);

}

}