android基础--通过http协议提交数据到web应用

通过get方式和post方式

1.建立web应用并部署在服务器上

package cn.com.servlet;

public class ManageServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

String title = request.getParameter("title");

String timelength = request.getParameter("timelength");

System.out.println("视频标题:"+title);

System.out.println("视频时长:"+timelength);

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

doGet(request, response);

}

}

package cn.com.service.impl;

public class VideoNewServiceImpl implements VideoNewService {

public List<News> getLastNews(){

List<News> news= new ArrayList<News>();

news.add(new News(3,"哈利波特",100));

news.add(new News(4,"music of voice",110));

news.add(new News(5,"飞跃疯人院",120));

return news;

}

}

package cn.com.request;

public class EncodeRequestWrapper extends HttpServletRequestWrapper {

private HttpServletRequest request;

public EncodeRequestWrapper(HttpServletRequest request) {

super(request);

this.request=request;

}

@Override

public String getParameter(String name) {

String value = request.getParameter(name);

try{

if(value!=null)

return new String(value.getBytes("ISO8859-1"), "UTF-8");

}catch (Exception e) {

}

return super.getParameter(name);

}

}

package cn.com.filter;

public class EncodeFilter implements Filter {

public EncodeFilter() {

}

public void destroy() {

}

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

HttpServletRequest req = (HttpServletRequest)request;

if("GET".equals(req.getMethod())){//get

EncodeRequestWrapper wrapper = new EncodeRequestWrapper(req);

chain.doFilter(wrapper, response);

}else{//post

req.setCharacterEncoding("UTF-8");

chain.doFilter(req, response);

}

}

public void init(FilterConfig fConfig) throws ServletException {

}

}

2.android项目:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/title"
/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/title"
/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/timelength"
/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:numeric="integer"
android:id="@+id/timelength"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button"
android:id="@+id/button"
/>
</LinearLayout>
package cn.com.service;

public class NewsManageService {

/**

* 保存数据

* @param title

* @param timelength

*/

public static boolean save(String title, String timelength) throws Exception{

String path = "http://192.168.1.131:8080/videonews/ManageServlet";

Map<String, String> params = new HashMap<String, String>();

params.put("title", title);

params.put("timelength", timelength);

return sendHttpClientRequest(path,params,"UTF-8");

}

/**

* 采用HttpClient发送POST请求

* 操作https和cookie时候代码量比较多，可以用httpclient框架，其他情况不建议用

* @param path请求路径

* @param params请求参数

* @throws IOException

* @throws ClientProtocolException

*/

private static boolean sendHttpClientRequest(String path,Map<String, String> params, String encoding) throws ClientProtocolException, IOException {

List<NameValuePair> param = new ArrayList<NameValuePair>();

if(param!=null&&!param.isEmpty()){

for(Map.Entry<String, String> entry : params.entrySet()){

param.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));

}

}

UrlEncodedFormEntity encodedFormEntity = new UrlEncodedFormEntity(param);

HttpPost post = new HttpPost(path);

post.setEntity(encodedFormEntity);

DefaultHttpClient client = new DefaultHttpClient();

HttpResponse response = client.execute(post);

if(response.getStatusLine().getStatusCode()==200){

return true;

}

return false;

}

/**

* 发送POST请求

* @param path请求路径

* @param params请求参数

*/

private static boolean sendPOSTRequest(String path,Map<String, String> params, String string)throws Exception {

StringBuilder sb = new StringBuilder();

//title=jjj&timelength=77

if(params!=null && !params.isEmpty()){

for(Map.Entry<String, String> entry : params.entrySet()){

sb.append(entry.getKey()).append('=').append(URLEncoder.encode(entry.getValue(), string)).append('&');

}

sb.deleteCharAt(sb.length()-1);

}

byte [] entity = sb.toString().getBytes();

HttpURLConnection connection = (HttpURLConnection) new URL(path).openConnection();

connection.setConnectTimeout(5000);

connection.setRequestMethod("POST");

connection.setDoOutput(true);//允许对外输出数据

connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

connection.setRequestProperty("Content-Length", String.valueOf(entity.length));

OutputStream outputStream = connection.getOutputStream();

outputStream.write(entity);

if(connection.getResponseCode()==200){

return true;

}

return false;

}

/**

* 发送GET请求

* @param path请求路径

* @param params请求参数

*/

private static boolean sendGETRequest(String path, Map<String, String> params,String encoding) throws Exception{

StringBuilder sb = new StringBuilder(path);

sb.append('?');

for(Map.Entry<String, String>entry:params.entrySet()){

sb.append(entry.getKey())

.append('=')

.append(URLEncoder.encode(entry.getValue(),encoding))

.append('&');

}

sb.deleteCharAt(sb.length()-1);

HttpURLConnection connection = (HttpURLConnection) new URL(sb.toString()).openConnection();

connection.setConnectTimeout(5000);

connection.setRequestMethod("GET");

if(connection.getResponseCode()==200){

return true;

}

return false;

}

}package cn.com.newsmanage;

public class MainActivity extends Activity {

private EditText titleText;

private EditText timelengthText;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

titleText=(EditText) this.findViewById(R.id.title);

timelengthText=(EditText) this.findViewById(R.id.timelength);

Button button = (Button) this.findViewById(R.id.button);

button.setOnClickListener(new ButtonClickListener());

}

private final class ButtonClickListener implements View.OnClickListener{

public void onClick(View v) {

String title = titleText.getText().toString();

String timelength = timelengthText.getText().toString();

try {

//写一个业务类传到WEB

NewsManageService.save(title,timelength);

Toast.makeText(getApplicationContext(), R.string.success, 1).show();

} catch (Exception e) {

Toast.makeText(getApplicationContext(), R.string.error, 1).show();

e.printStackTrace();

}

}

}

}