建设网站商城,建设一个货架网站,外贸客户如何开发,做网站的步骤的文本本文主要包括三方面内容
Httpurlconnection中doGet与doPost方法实现提交数据到服务器HttpClient中doGet与doPost方法实现提交数据到服务器android-async-http开源库方法实现提交数据到服务器
首先是服务器端的实现
public class LoginServlet extends HttpServlet {/*** Th…本文主要包括三方面内容
Httpurlconnection中doGet与doPost方法实现提交数据到服务器HttpClient中doGet与doPost方法实现提交数据到服务器android-async-http开源库方法实现提交数据到服务器
首先是服务器端的实现
public class LoginServlet extends HttpServlet {/*** The doGet method of the servlet. br** This method is called when a form has its tag value method equals to get.* * param request the request send by the client to the server* param response the response send by the server to the client* throws ServletException if an error occurred* throws IOException if an error occurred*/public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String username request.getParameter(username); // 采用的编码是: iso-8859-1String password request.getParameter(password);// 采用iso8859-1的编码对姓名进行逆转, 转换成字节数组, 再使用utf-8编码对数据进行转换, 字符串username new String(username.getBytes(iso8859-1), utf-8);password new String(password.getBytes(iso8859-1), utf-8);System.out.println(姓名: username);System.out.println(密码: password);if(lisi.equals(username) 123.equals(password)) {/** getBytes 默认情况下, 使用的iso8859-1的编码, 但如果发现码表中没有当前字符, * 会使用当前系统下的默认编码: GBK*/ response.getOutputStream().write(登录成功.getBytes(utf-8));} else {response.getOutputStream().write(登录失败.getBytes(utf-8));}}/*** The doPost method of the servlet. br** This method is called when a form has its tag value method equals to post.* * param request the request send by the client to the server* param response the response send by the server to the client* throws ServletException if an error occurred* throws IOException if an error occurred*/public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {System.out.println(doPost);doGet(request, response);}}
Httpurlconnection实现提交数据到服务器
public class NetUtils {private static final String TAG NetUtils;/*** 使用post的方式登录* param userName* param password* return*/public static String loginOfPost(String userName, String password) {HttpURLConnection conn null;try {URL url new URL(http://10.0.2.2:8080/ServerItheima28/servlet/LoginServlet);conn (HttpURLConnection) url.openConnection();conn.setRequestMethod(POST);conn.setConnectTimeout(10000); // 连接的超时时间conn.setReadTimeout(5000); // 读数据的超时时间conn.setDoOutput(true); // 必须设置此方法, 允许输出
// conn.setRequestProperty(Content-Length, 234); // 设置请求头消息, 可以设置多个// post请求的参数String data username userName password password;// 获得一个输出流, 用于向服务器写数据, 默认情况下, 系统不允许向服务器输出内容OutputStream out conn.getOutputStream(); out.write(data.getBytes());out.flush();out.close();int responseCode conn.getResponseCode();if(responseCode 200) {InputStream is conn.getInputStream();String state getStringFromInputStream(is);return state;} else {Log.i(TAG, 访问失败: responseCode);}} catch (Exception e) {e.printStackTrace();} finally {if(conn ! null) {conn.disconnect();}}return null;}/*** 使用get的方式登录* param userName* param password* return 登录的状态*/public static String loginOfGet(String userName, String password) {HttpURLConnection conn null;try {String data username URLEncoder.encode(userName) password URLEncoder.encode(password);URL url new URL(http://10.0.2.2:8080/ServerItheima28/servlet/LoginServlet? data);conn (HttpURLConnection) url.openConnection();conn.setRequestMethod(GET); // get或者post必须得全大写conn.setConnectTimeout(10000); // 连接的超时时间conn.setReadTimeout(5000); // 读数据的超时时间int responseCode conn.getResponseCode();if(responseCode 200) {InputStream is conn.getInputStream();String state getStringFromInputStream(is);return state;} else {Log.i(TAG, 访问失败: responseCode);}} catch (Exception e) {e.printStackTrace();} finally {if(conn ! null) {conn.disconnect(); // 关闭连接}}return null;}/*** 根据流返回一个字符串信息* param is* return* throws IOException */private static String getStringFromInputStream(InputStream is) throws IOException {ByteArrayOutputStream baos new ByteArrayOutputStream();byte[] buffer new byte[1024];int len -1;while((len is.read(buffer)) ! -1) {baos.write(buffer, 0, len);}is.close();String html baos.toString(); // 把流中的数据转换成字符串, 采用的编码是: utf-8// String html new String(baos.toByteArray(), GBK);baos.close();return html;}
}
HttpClient实现提交数据到服务器
public class NetUtils2 {private static final String TAG NetUtils;/*** 使用post的方式登录* param userName* param password* return*/public static String loginOfPost(String userName, String password) {HttpClient client null;try {// 定义一个客户端client new DefaultHttpClient();// 定义post方法HttpPost post new HttpPost(http://10.0.2.2:8080/ServerItheima28/servlet/LoginServlet);// 定义post请求的参数ListNameValuePair parameters new ArrayListNameValuePair();parameters.add(new BasicNameValuePair(username, userName));parameters.add(new BasicNameValuePair(password, password));// 把post请求的参数包装了一层.// 不写编码名称服务器收数据时乱码. 需要指定字符集为utf-8UrlEncodedFormEntity entity new UrlEncodedFormEntity(parameters, utf-8);// 设置参数.post.setEntity(entity);// 设置请求头消息
// post.addHeader(Content-Length, 20);// 使用客户端执行post方法HttpResponse response client.execute(post); // 开始执行post请求, 会返回给我们一个HttpResponse对象// 使用响应对象, 获得状态码, 处理内容int statusCode response.getStatusLine().getStatusCode(); // 获得状态码if(statusCode 200) {// 使用响应对象获得实体, 获得输入流InputStream is response.getEntity().getContent();String text getStringFromInputStream(is);return text;} else {Log.i(TAG, 请求失败: statusCode);}} catch (Exception e) {e.printStackTrace();} finally {if(client ! null) {client.getConnectionManager().shutdown(); // 关闭连接和释放资源}}return null;}/*** 使用get的方式登录* param userName* param password* return 登录的状态*/public static String loginOfGet(String userName, String password) {HttpClient client null;try {// 定义一个客户端client new DefaultHttpClient();// 定义一个get请求方法String data username userName password password;HttpGet get new HttpGet(http://10.0.2.2:8080/ServerItheima28/servlet/LoginServlet? data);// response 服务器相应对象, 其中包含了状态信息和服务器返回的数据HttpResponse response client.execute(get); // 开始执行get方法, 请求网络// 获得响应码int statusCode response.getStatusLine().getStatusCode();if(statusCode 200) {InputStream is response.getEntity().getContent();String text getStringFromInputStream(is);return text;} else {Log.i(TAG, 请求失败: statusCode);}} catch (Exception e) {e.printStackTrace();} finally {if(client ! null) {client.getConnectionManager().shutdown(); // 关闭连接, 和释放资源}}return null;}/*** 根据流返回一个字符串信息* param is* return* throws IOException */private static String getStringFromInputStream(InputStream is) throws IOException {ByteArrayOutputStream baos new ByteArrayOutputStream();byte[] buffer new byte[1024];int len -1;while((len is.read(buffer)) ! -1) {baos.write(buffer, 0, len);}is.close();String html baos.toString(); // 把流中的数据转换成字符串, 采用的编码是: utf-8// String html new String(baos.toByteArray(), GBK);baos.close();return html;}
}
在onCreate方法中的调用
public class MainActivity extends Activity {private EditText etUserName;private EditText etPassword;Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);etUserName (EditText) findViewById(R.id.et_username);etPassword (EditText) findViewById(R.id.et_password);}public void doGet(View v) {final String userName etUserName.getText().toString();final String password etPassword.getText().toString();new Thread(new Runnable() {Overridepublic void run() {// 使用get方式抓去数据final String state NetUtils.loginOfGet(userName, password);// 执行任务在主线程中runOnUiThread(new Runnable() {Overridepublic void run() {// 就是在主线程中操作Toast.makeText(MainActivity.this, state, 0).show();}});}}).start();}public void doPost(View v) {final String userName etUserName.getText().toString();final String password etPassword.getText().toString();new Thread(new Runnable() {Overridepublic void run() {final String state NetUtils.loginOfPost(userName, password);// 执行任务在主线程中runOnUiThread(new Runnable() {Overridepublic void run() {// 就是在主线程中操作Toast.makeText(MainActivity.this, state, 0).show();}});}}).start();}
}
使用runOnUiThread方法可以在子线程中实现对主线程的操作
使用android-async-http开源库方法实现提交数据到服务器 ,使用方法也是将src文件夹中的内容复制到程序中即可
public class MainActivity2 extends Activity {protected static final String TAG MainActivity2;private EditText etUserName;private EditText etPassword;Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);etUserName (EditText) findViewById(R.id.et_username);etPassword (EditText) findViewById(R.id.et_password);}public void doGet(View v) {final String userName etUserName.getText().toString();final String password etPassword.getText().toString();AsyncHttpClient client new AsyncHttpClient();String data username URLEncoder.encode(userName) password URLEncoder.encode(password);client.get(http://10.0.2.2:8080/ServerItheima28/servlet/LoginServlet? data, new MyResponseHandler());}public void doPost(View v) {final String userName etUserName.getText().toString();final String password etPassword.getText().toString();AsyncHttpClient client new AsyncHttpClient();RequestParams params new RequestParams();params.put(username, userName);params.put(password, password);client.post(http://10.0.2.2:8080/ServerItheima28/servlet/LoginServlet, params, new MyResponseHandler());}class MyResponseHandler extends AsyncHttpResponseHandler {Overridepublic void onSuccess(int statusCode, Header[] headers,byte[] responseBody) {
// Log.i(TAG, statusCode: statusCode);Toast.makeText(MainActivity2.this, 成功: statusCode: statusCode , body: new String(responseBody), 0).show();}Overridepublic void onFailure(int statusCode, Header[] headers,byte[] responseBody, Throwable error) {Toast.makeText(MainActivity2.this, 失败: statusCode: statusCode, 0).show();}}
}
可以看到使用开源框架可以更加简单高效安全的实现相同的效果.
完成
