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刚刚尝试过这一点，但它失败了。我使用蓝牙将我的midlet上传到手机，并尝试连接到运行在PC上的我的servlet，但失败了。我的想象力是使用调制解调器将我的电脑连接到互联网，然后获取其IP地址，并用该IP地址替换midlet中的url，并将其构建并放置在手机中。它不起作用。可以做什么？请帮助如何让手机上的midlet访问电脑上的servlet
这是我的代码：Midlet：`import javax.microedition.midlet。 ; // MIDlet类包导入 import javax.microedition.lcdui。; //用于UI和命令的包 import javax.microedition.io。 ; // import java.io.;
/** * @author k'owino */// 定义MIDlet类 公共类MMM延伸的MIDlet实现的CommandListener {
private boolean midletPaused = false;//variable for paused state of midlet
//defining variables
private Display display;// Reference to Display object
private Form welForm;//welcome form
private Form welForm2;//welcome form
private Form welForm3;//welcome form
private List mainMenu;//vote code
private List voteCats;//vote cats
private List voteCats2;//vote cats
private StringItem welStr;
private StringItem welStr1;
private TextField codeField;
private StringItem codeError;
private Command quitCmd;
private Command contCmd;
private Command quitCmd1;
private Command contCmd1;
private Command quitCmd3;
private Command contCmd3;
private Command okCmd;
private Command quCmd;
private Command bkCmd;
private Command ok2Cmd;
String codefield;
public static String[] list_wrd = new String[100];
public static String[] list_wrd1 = new String[100];
public static String track = "";
int l;
int g;
String selected, postn_scted;
String cnfrm, cnfrm2;
String st2;
//constructor of the midlet
public mmm() {
display = Display.getDisplay(this);//creating the display object
welForm = new Form("THE MVS");//instantiating welForm object
welStr = new StringItem("", "Welcome to the MVS, Busitema's mobile voter."
+ "Please enter your voting code below");//instantiating welStr string item
codeError = new StringItem("", "");//intantiating phone error string item
codeField = new TextField("Voting code", "", 10, TextField.PASSWORD);//phone number field object
quitCmd = new Command("Quit", Command.EXIT, 0);//creating quit command object
contCmd = new Command("Continue", Command.OK, 0);//creating continue command object
welForm.append(welStr);//adding welcome string item to form
welForm.append(codeField);//adding phone field to form
welForm.append(codeError);//adding phone error string item to form
welForm.addCommand(contCmd);//adding continue command
welForm.addCommand(quitCmd);//adding quit command
welForm.setCommandListener(this);
display.setCurrent(welForm);
}
//start application method definition
public void startApp() {
}
//pause application method definition
public void pauseApp() {
}
//destroy application method definition
public void destroyApp(boolean unconditional) {
}
//Command action method definition
public void commandAction(Command c, Displayable d) {
if (d == welForm) {
if (c == quitCmd) {
exitMidlet();//call to exit midlet
} else {//if the command is contCmd
//place a waiting activity indicator
System.out.println("ken de man");
Thread t = new Thread() {
public void run() {
try {
//method to connect to server
sendPhone();
} catch (Exception e) {
}//end of catch
}//end of ru()
};//end of thread
t.start();//starting the thread
}//end of else
}//end of first if
} //命令动作的结束
//defining sendPhone method
public void sendPhone() throws IOException {
System.out.println("ken de man");//check
HttpConnection http = null;//HttpConnection variable
OutputStream oStrm = null;//OutputStream variable
InputStream iStrm = null;//InputStream variable
//String url = "http://10.100.29.15:8080/www/serv" + "?" + "code=" + codeField.getString();//server url and parameters
String url = "http://localhost:8080/www/serv" + "?" + "code=" + codeField.getString();//server url and parameters
try {
http = (HttpConnection) Connector.open(url);//opening connection
System.out.println("connection made");//checking code
//oStrm = http.openOutputStream();//opening output stream
http.setRequestMethod(HttpConnection.GET);//setting request type
//http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");//setting content type
//byte data[] = ("phone=" + phoneField.getString()).getBytes();
//oStrm.write(data);
iStrm = http.openInputStream();//openning input stream
if (http.getResponseCode() == HttpConnection.HTTP_OK) {//if the connection is ok
int length = (int) http.getLength();
String str;
if (length != -1) {
byte servletData[] = new byte[length];
iStrm.read(servletData);
str = new String(servletData);
} else // Length not available...
{
ByteArrayOutputStream bStrm = new ByteArrayOutputStream();
int ch;
while ((ch = iStrm.read()) != -1) {
bStrm.write(ch);
}
str = new String(bStrm.toByteArray());
bStrm.close();
}
System.out.println("de man");
System.out.println(str);
int x = str.length();
System.out.println(x);
if (str.equals("ok")) {
track = codeField.getString();
codeField.setString("");//emptying textfield
mainMenu = new List("", Choice.IMPLICIT);//creating a list object
mainMenu.append("Vote", null);
mainMenu.append("Results", null);
quCmd = new Command("Quit", Command.EXIT, 0);//creating a quit command on the list
okCmd = new Command("Ok", Command.OK, 0);//creating an ok command on the list
mainMenu.addCommand(okCmd);//adding ok command
mainMenu.addCommand(quCmd);//adding quit command
mainMenu.setSelectCommand(okCmd);//setting the default select command
mainMenu.setCommandListener(this);//setting the command listener
display.setCurrent(mainMenu);
} else {
//add error message to phone_error stingItem
codeField.setString("");//emptying textfield
codeError.setText("Wrong code, please enter right code");
display.setCurrent(welForm);
}
}
} catch (Exception e) {
} finally {
if (iStrm != null) {
iStrm.close();
}
if (http != null) {
http.close();
}
}
}
} //结束课 servlet: import java.io. ; //用于io类的包 import javax.servlet.ServletException; //用于servlet异常类的包 import javax.servlet.http。; 进口java.sql中。*; //包的SQL类
/** * * @author k'owino */ 公共类SERV延伸的HttpServlet {
@Override
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
//declaring variables
PrintWriter pw;//PrintWriter object
String vcode;//code parameter sent from client
Connection con = null;//connection variable
String dbDriver = "com.mysql.jdbc.Driver";//the database driver
String dbUrl = "jdbc:mysql://localhost/mvs_db";//the database url
String dbUser = "root";//database user
String dbPwd = "";//database password
PreparedStatement pstmt = null;//Prepared statement variable
String query = "select * from student where vote_code = ?;";//the query to select code from db
ResultSet rs = null;//resultset variable
String dbCode = null;//code from database
//getting the "phone" parameter sent from client
vcode = req.getParameter("code");//getting the "code" parameter sent from voter
//vcode = "345qwert";
//setting the content type of the response
res.setContentType("text/plain");
//creating a PrintWriter object
pw = res.getWriter();//getting a writer
//pw.println("ken");
try {//trying to load the database driver and establish a connection to the database
Class.forName(dbDriver);//loading the database driver
con = DriverManager.getConnection(dbUrl, dbUser, dbPwd);//establishing a connection to the database
//pw.println("connection established");//output if connection is established
} catch (Exception e) {
e.printStackTrace(pw);//printing the exception error trace to the writer
}
//trying to query the database
try {
pstmt = con.prepareStatement(query);//preparing a statement
pstmt.setString(1, vcode);//setting the input parameter
rs = pstmt.executeQuery();//executing the query assigning to the resultset object
//pw.println("ken");
//extracring data from the resultset
while (rs.next()) {
dbCode = rs.getString("vote_code");//getting the code from database
//pw.println(dbPhone);
}//end of while
if (vcode.equals(dbCode)) {
pw.print("ok");//printing ok if code mataches
} else {
pw.print("error");//printing error if code doesn't match
}
//pw.println("yeah");
} catch (Exception e) {
e.printStackTrace(pw);//sending the error
}
finally{
if(pw !=null){
pw.close();
}
}
}
}`。没有错误。在模拟器中正常工作，但在手机上无法连接到servlet。
我们需要看到一些代码能够帮助你，到目前为止你尝试过了什么？你得到什么样的错误？ – 2011-05-26 22:32:53
这是我的代码： – ken 2011-05-26 22:44:38