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:","盧東方",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);
//設置請求屬性
hc.setRequestMethod(HttpConnection.POST);
//設置為POST請求方式,默認的請求方式是GET
hc.setRequesthc.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頭可以控制MIDlet和Web服務器之間保持"keep alive"特色。
"keep alive"特色是指在MIDlet和Web服務器間始終使用同一個HTTP連接來多次傳遞數據
（在通常情況下，HTTP是無連接的協議，每次數據傳輸完畢后都將斷開連接，
而下次傳遞數據之前將重新建立連接）
//發送請求參數到servlet
dos = hc.openDataOutputStream();
dos.writeUTF(tf1Str); dos.writeUTF(tf2Str);
//用于發送請求參數給servlet
System.out.println("手機傳遞給servlet的第一個參數為:"+ tf1Str);
//主要起調試的作用，調試的結果將顯示在WTK的控制臺中
System.out.println("手機傳遞給servlet的第一個參數為:"+ tf2Str);
dos.flush(); dos.close();
//接收servlet響應數據
ds = new DataInputStream(hc.openInputStream());
String return1Str = dis.readUTF(); String return2Str = dis.readUTF();
System.out.println("手機接收到servlet端傳來的第一個參數為:" + return1Str);
//主要起調試的作用，調試的結果將顯示在WTK的控制臺中
System.out.println("手機接收到servlet端傳來的第二個參數為:" + return2Str);
returnform = new form("返回的結果");
returnform.append(return1Str); returnform.append(" ");
//將返回的結果append到resultform中
returnform.append(return2Str); returnform.addCommand(cmdBack);
returnform.setCommandListener(this);
}finally{
if (dis !
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