import javax.microedition.midlet.*;
            import javax.microedition.lcdui.*;
            import javax.microedition.io.*;
            import java.io.*;
            public class ClientApp extends
            MIDlet implements CommandListener
            {
            Display display; TextField tf1,
            tf2; String tf1Str,tf2Str;
            Form inputForm,returnForm;
            Command cmdSend,cmdBack;
            final static String defaultURL =
            "http://localhost:8080/examples
            /servlet/ServletApp";
            public ClientApp()
            {
            display = Display.getDisplay(this);
            tf1 = new TextField("input first param:",
            "卢东方",20,TextField.ANY);
            tf2 = new TextField("input second param:",
            "王桃群",20,TextField.ANY);
            cmdSend = new Command("Send",Command.SCREEN,1);
            cmdBack = new Command("Back",Command.SCREEN,1);
            inputForm = new Form("pls input the param:");
            inputForm.append(tf1); inputForm.append(tf2);
            inputForm.addCommand(cmdSend);
            inputForm.setCommandListener(this);
            }
            public void startApp()
            throws MIDletStateChangeException
            {
            display.setCurrent(inputForm);
            }
            public void invokeServlet(String url)
            throws IOException
            {
            HttpConnection hc = null;
            DataOutputStream dos = null;
            DataInputStream dis = null;
            try{
            hc = (HttpConnection)Connector.open
            (url,Connector.READ_WRITE);
            //设置请求属性
            hc.setRequestMethod(HttpConnection.POST);
            //设置为POST请求方式,默认的请求方式是GET
            hc.setRequestProperty
            ("IF-Modified-Since","15 Oct
            2003 08:47:14 GMT");
            hc.setRequestProperty("User-Agent",
            "Profile/MIDP-1.0 Configuration/CLDC-1.0");
            hc.setRequestProperty
            ("Content-Language","en-CA");
            hc.setRequestProperty
            ("Content-Type","application
            /x-www-form-urlencoded");
            hc.setRequestProperty
            ("Connection","Keep-Alive");
            //Connection头可以控制MIDlet
            和Web服务器之间保持"keep alive"特色。
            "keep alive"特色是指在MIDlet
            和Web服务器间始终使用同一个HTTP连接来多次传递数据
            （在通常情况下，HTTP是无连接的协议，
            每次数据传输完毕后都将断开连接，
            而下次传递数据之前将重新建立连接）
            //发送请求参数到servlet
            dos = hc.openDataOutputStream();
            dos.writeUTF(tf1Str);
            dos.writeUTF(tf2Str);
            //用于发送请求参数给servlet
            System.out.println
            ("手机传递给servlet的第一个参数为:"+ tf1Str);
            //主要起调试的作用，
            调试的结果将显示在WTK的控制台中
            System.out.println
            ("手机传递给servlet的第一个参数为:"+ tf2Str);
            dos.flush(); dos.close();
            //接收servlet响应数据
            ds = new DataInputStream
            (hc.openInputStream());
            String return1Str = dis.readUTF();
            String return2Str = dis.readUTF();
            System.out.println
            ("手机接收到servlet端传来的第一个参数为:"
            + return1Str);
            //主要起调试的作用，
            调试的结果将显示在WTK的控制台中
            System.out.println
            ("手机接收到servlet端传来的第二个参数为:
            " + return2Str);
            returnForm = new Form("返回的结果");
            returnForm.append(return1Str);
            returnForm.append("\n");
            //将返回的结果append到resultForm中
            returnForm.append(return2Str);
            returnForm.addCommand(cmdBack);
            returnForm.setCommandListener(this);
            }finally{
            if (dis != null) {dis.close();
            }
            if (dos != null) {dos.close();
            }
            if (hc != null) {hc.close();
            }
            }
            display.setCurrent(returnForm);
            }
            public void pauseApp()
            {
            }
            public void destroyApp
            (boolean unconditional)
            {
            }
            public void commandAction
            (Command c,Displayable d)
            {
            if(c == cmdBack){display.setCurrent(inputForm);
            }
            if(c == cmdSend){tf1Str =
            tf1.getString(); tf2Str =
            tf2.getString();
            try{ invokeServlet(defaultURL);
            }catch(Exception e)
            {
            System.out.println(e.getMessage());
            }
            }
            }
            }

import java.io.*;
            import java.sql.*;
            import javax.servlet.*;
            import javax.servlet.http.*;
            public class ServletApp extends HttpServlet
            {
            public void doGet
            (HttpServletRequest request,
            HttpServletResponse response)
            throws IOException,ServletException
            {
            response.setContentType
            ("text/html; charset=GBK");
            //设置响应属性
            //接收客户端的请求
            InputStream is =
            request.getInputStream();
            DataInputStream dis =
            new DataInputStream(is);
            String tf1Str = dis.readUTF();
            String tf2Str = dis.readUTF();
            System.out.println
            ("servlet端接收到手机传来的第一个参数为：
            " + tf1Str);
            // 主要起调试的作用，
            调试的结果显示在tomcat的启动DOS窗口中
            System.out.println
            ("servlet端接收到手机传来的第二个参数为：
            " + tf2Str);
            //对接收的参数进行处理
            String return1Str =
            tf1Str.concat(":早上好!");
            //在接收到的参数后连接字符串
            String return2Str =
            tf2Str.concat(":晚上好!");
            //发送处理后的参数给手机
            DataOutputStream dos =
            new DataOutputStream
            (response.getOutputStream());
            dos.writeUTF(return1Str);
            dos.writeUTF(return2Str);
            System.out.println
            ("servlet传递给手机的第一个参数为:"
            + return1Str);
            System.out.println
            ("servlet传递给手机的第二个参数为:"
            + return2Str);
            }
            public void doPost
            (HttpServletRequest request,
            HttpServletResponse response)
            throws
            ServletException,IOException
            {
            doGet(request,response);
            }
            public void destroy()
            {
            }
            //清除资源
            }