get、post、httpclient-get、httpclient-post

网络请求：get、post、httpclient-get、httpclient-post

安卓客户端通过各种网络请求方式将用户名和密码提交到自己编写的本地Java后台，后台通过Servlet获取网络提交的数据，判断是否跟原先设置好的用户名和密码一致。

以下是安卓客户端的Demo显示界面：

布局文件：

<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:orientation="vertical"    tools:context="com.csh.form.MainActivity" >    <EditText         android:id="@+id/et_name"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:hint="用户名"/>        <EditText         android:id="@+id/et_pass"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:hint="密码"/>        <Button         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="get请求登录"        android:onClick="login"/>    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="post请求登录"         android:onClick="postLogin"/>    <Button        android:id="@+id/button2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="HttpClient--Get"        android:onClick="HttpClientGet" />    <Button        android:id="@+id/button3"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="HttpClient--Post"        android:onClick="HttpClientPost" /></LinearLayout>

Android实现各种网络请求代码：

/*** get请求* @param v*/public void login(View v) {name = et_name.getText().toString();pass = et_pass.getText().toString();Thread thread = new Thread() {@Overridepublic void run() {super.run();String path = "http://192.168.0.103:8099/RegesterServlet/RegesterServlet?username=" + URLEncoder.encode(name) + "&password=" + pass;try {URL url = new URL(path);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("GET");conn.setConnectTimeout(8 * 1000);conn.setReadTimeout(8 * 1000);System.out.println("测试--1");conn.connect();System.out.println("测试--2");if (conn.getResponseCode() == 200) { //请求成功InputStream is = conn.getInputStream();String text = HttpTools.getText(is);System.out.println(text);Message msg = handler.obtainMessage();msg.obj = text;msg.what = 1;handler.sendMessage(msg);} else { //请求失败System.out.println("请求失败");}} catch (Exception e) {e.printStackTrace();System.out.println(e);}}};thread.start();}/** * post请求 * @param v */public void postLogin(View v) {name = et_name.getText().toString();pass = et_pass.getText().toString();Thread thread = new Thread() {@Overridepublic void run() {super.run();String path = "http://192.168.0.103:8099/RegesterServlet/RegesterServlet";try {URL url = new URL(path);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("POST");conn.setConnectTimeout(8 * 1000);conn.setReadTimeout(8 * 1000);//添加post请求头中自动添加的属性//流里的数据的mimetypeconn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");String content = "username=" + URLEncoder.encode(name) + "&password=" + pass;//流里数据的长度conn.setRequestProperty("Content-Length", content.length() + "");//打开连接对象的输出流conn.setDoOutput(true);//获取连接对象的输出流OutputStream os = conn.getOutputStream();//把数据写入到输出流中os.write(content.getBytes());if (conn.getResponseCode() == 200) {InputStream is = conn.getInputStream();String text = HttpTools.getText(is);Message msg = handler.obtainMessage();msg.obj = text;msg.what = 1;handler.sendMessage(msg);}} catch (Exception e) {e.printStackTrace();}}};thread.start();}/** * httpClient -- get请求 * @param v */public void HttpClientGet(View v) {name = et_name.getText().toString();pass = et_pass.getText().toString();Thread thread = new Thread() {@Overridepublic void run() {super.run();String path = "http://192.168.0.103:8099/RegesterServlet/RegesterServlet?username=" + URLEncoder.encode(name) + "&password=" + pass;try {//1、创建client对象HttpClient client = new DefaultHttpClient();//2、创建get请求对象HttpGet get = new HttpGet(path);//3、使用client发送get请求HttpResponse response = client.execute(get);//4、获取状态行StatusLine line = response.getStatusLine();//5、获取状态码int statusCode = line.getStatusCode();if (statusCode == 200) {//6、获取实体HttpEntity entity = response.getEntity();InputStream is = entity.getContent();String text = HttpTools.getText(is);Message msg = handler.obtainMessage();msg.obj = text;msg.what = 1;handler.sendMessage(msg);}} catch (Exception e) {e.printStackTrace();}}};thread.start();}/** * httpClient -- post请求 * @param v */public void HttpClientPost(View v) {name = et_name.getText().toString();pass = et_pass.getText().toString();Thread thread = new Thread() {@Overridepublic void run() {super.run();String path = "http://192.168.0.103:8099/RegesterServlet/RegesterServlet";//1、创建client对象HttpClient client = new DefaultHttpClient();//2、创建post请求对象HttpPost post = new HttpPost(path);//3、把要提交的数据封装至post中----创建实体对象List<NameValuePair> parameters = new ArrayList<NameValuePair>();BasicNameValuePair bnvp1 = new BasicNameValuePair("username", name);BasicNameValuePair bnvp2 = new BasicNameValuePair("password", pass);parameters.add(bnvp1);parameters.add(bnvp2);try {UrlEncodedFormEntity entity = new UrlEncodedFormEntity(parameters, "utf-8");//4、把实体对象封装至post对象中post.setEntity(entity);} catch (UnsupportedEncodingException e1) {e1.printStackTrace();}try {//5、使用client发送post请求HttpResponse response = client.execute(post);//6、获取状态行StatusLine line = response.getStatusLine();//7、获取状态码int code = line.getStatusCode();if (code == 200) {//8、获取实体HttpEntity entity = response.getEntity();//获取输入流InputStream is = entity.getContent();String text = HttpTools.getText(is);Message msg = handler.obtainMessage();msg.obj = text;msg.what = 1;handler.sendMessage(msg);}} catch (Exception e) {e.printStackTrace();}}};thread.start();}

Java实现的后台Servlet代码如下：

@WebServlet("/RegesterServlet")public class RegesterServlet extends HttpServlet {private static final long serialVersionUID = 1L;           /**     * @see HttpServlet#HttpServlet()     */    public RegesterServlet() {        super();        // TODO Auto-generated constructor stub    }/** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stub//response.getWriter().append("Served at: ").append(request.getContextPath());String username = request.getParameter("username");String password = request.getParameter("password");System.out.println(username + " : " + password);System.out.println("-----------------------------------");ServletOutputStream os = response.getOutputStream();if (username.equals("qwe") && password.equals("123")) {os.write("登录成功".getBytes());System.out.println("---------------登陆成功----------------");} else {os.write("登录失败！！！".getBytes());System.out.println("---------------登陆失败----------------");}}/** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoGet(request, response);}}

Android客户端中网络请求的链接可以现在网页中测试，写一个form表单，实现get和post请求，然后在地址栏copy链接，进而在Android中实现相对应的网络请求，以下是表单的代码：

<body>    <form action="RegesterServlet" method="post">Username: <input type="text" name="username"> <br>Password: <input type="password" name="password"> <br><input type="submit" value="Login"></form><br>  </body>

表单中的post请求只需要将上面method改成post即可。