客户端开发平台：Android studio（ sdk版本26 ，模拟器 Android7.0）
服务器开发平台：eclipse+tomcat*
服务端
1.新建名为login_server的动态web项目（注意勾选自动添加web.xml配置文件）
2.在项目Java目录中新建包：main
3.在包main下新建名为Login的servlet
4.然后写添加代码：
public class Login extends HttpServlet {
private static final long serialVersionUID = 1L;
public Login() {
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
String loginName = request.getParameter("name");
String loginPwd = request.getParameter("pwd");
if(loginName.equals("1")&&loginPwd.equals("1")) {
System.out.println("success in Server ");
out.print(true);
// request.getRequestDispatcher("success.html").forward(request, response);
}else {
out.print(false);
}
}
}
在web.xml配置文件中写上如下代码：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>fleaMarket</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>Login</servlet-name>
<servlet-class>main.Login</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Login</servlet-name>
<url-pattern>/Login</url-pattern>
</servlet-mapping>
</web-app>
5.再webContent目录下添加名为index的html文件，添加如下代码
<body>
<form action="Login" method="post">
<table align="center">
<tr>
<td>user:</td>
<td><input type="text" name="name"></td>
</tr>
<tr>
<td>password:</td>
<td><input type="text" name="pwd"></td>
</tr>
<tr>
<tr>
<td>submit</td>
<td><input type="submit"></td>
</tr>
</table>
1.在android studio上新建一个名为fleaMarket项目
2.新建Java类LoginServer，代码如下：
public class LoginToServer {
private String result;
private Boolean isConnect = false;
private String url = "http://192.168.43.3:8080/fleaMarket/Login";//连接服务器的地址，千万别弄错了
private OkHttpClient okHttpClient = new OkHttpClient();
public String doPost(String name,String pwd) throws IOException{
RequestBody formBody = new FormBody.Builder()
.add("name",name)
.add("pwd",pwd)
.build();
final Request request = new Request.Builder()
.url(url)
.post(formBody)
.build();
Response response;
try{
response = okHttpClient.newCall(request).execute();
Log.d("loginToServer",String.valueOf(response.isSuccessful()));
if (response.isSuccessful()){
isConnect = true;
}
if(isConnect){
result = response.body().string();
}
}catch (IOException e){
e.printStackTrace();
}
return result;
}
}
3.在主活动MainActivity的代码如下：
public class MainActivity extends AppCompatActivity {
private EditText name;
private EditText pwd;
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initail();
button.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
final Handler myHandler = new Handler(){
public void handleMessage(Message msg){
String responseResult = (String)msg.obj;
if(responseResult.equals("true")){
Toast.makeText(MainActivity.this,"登录成功",Toast.LENGTH_SHORT).show();
}else {
Toast.makeText(MainActivity.this,"登录失败",Toast.LENGTH_SHORT).show();
}
}
};
new Thread(new Runnable() {
@Override
public void run() {
LoginToServer loginToServer = new LoginToServer();
try{
String result = loginToServer.doPost(name.getText().toString().trim(),pwd.getText().toString().trim());
Message message = new Message();
message.obj = result;
Log.d("Main result",result);
myHandler.sendMessage(message);
}catch(IOException e){
e.printStackTrace();
}
}
}).start();
}
});
}
public void initail(){
name = (EditText)findViewById(R.id.name);
pwd = (EditText)findViewById(R.id.password);
button = (Button)findViewById(R.id.login);
}
}
5.主活动的布局文件代码：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="@+id/name"
android:layout_width="match_parent"
android:layout_height="50dp"
android:hint="姓名"/>
<EditText
android:id="@+id/password"
android:layout_width="match_parent"
android:layout_height="50dp"
android:hint="密码"
android:inputType="textPassword"/>
<Button
android:id="@+id/login"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="登录"
android:textSize="26sp"
android:textColor="#000"/>
<uses-permission android:name="android.permission.INTERNET"/>
补充：
1.先在tomcat上启动index.html
2.然后在客户端启动Android项目后就可以连接服务器了！
3.在eclipse下的console中可以看到来自客户端的请求