Java Tutorial/J2ME/Connector
Содержание
Call asp page from J2ME
<source lang="java">
import java.io.IOException; import java.io.InputStream; import javax.microedition.io.Connector; import javax.microedition.io.HttpConnection; import javax.microedition.lcdui.Alert; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Form; import javax.microedition.midlet.MIDlet; public class CookieMIDlet extends MIDlet {
private Display mDisplay;
private Form mForm;
private String mSession;
public void startApp() {
mDisplay = Display.getDisplay(this);
mForm = new Form("CookieMIDlet");
mForm.addCommand(new Command("Exit", Command.EXIT, 0));
mForm.addCommand(new Command("Send", Command.SCREEN, 0));
mForm.setCommandListener(new CommandListener() {
public void commandAction(Command c, Displayable s) {
if (c.getCommandType() == Command.EXIT)
notifyDestroyed();
else
send();
}
});
mDisplay.setCurrent(mForm);
}
private void send() {
String url = "http://localhost/http.asp";
try {
HttpConnection hc = (HttpConnection) Connector.open(url);
if (mSession != null)
hc.setRequestProperty("cookie", mSession);
InputStream in = hc.openInputStream();
String cookie = hc.getHeaderField("Set-cookie");
if (cookie != null) {
int semicolon = cookie.indexOf(";");
mSession = cookie.substring(0, semicolon);
}
int length = (int) hc.getLength();
byte[] raw = new byte[length];
in.read(raw);
String s = new String(raw);
Alert a = new Alert("Response", s, null, null);
a.setTimeout(Alert.FOREVER);
mDisplay.setCurrent(a, mForm);
in.close();
hc.close();
} catch (IOException ioe) {
Alert a = new Alert("Exception", ioe.toString(), null, null);
a.setTimeout(Alert.FOREVER);
mDisplay.setCurrent(a, mForm);
}
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
}</source>
Check Http connection returning code
<source lang="java">
import java.io.IOException; import javax.microedition.io.Connector; import javax.microedition.io.HttpConnection; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.StringItem; import javax.microedition.lcdui.TextField; import javax.microedition.midlet.MIDlet; public class HttpOKMIDlet extends MIDlet implements CommandListener {
private Command exitCommand = new Command("Exit", Command.EXIT, 1);
private Command sendCommand = new Command("Send", Command.OK, 1);
private Command backCommand= new Command("Upload", Command.OK, 1);
private Display display;
private String defaultURL = "http://localhost/";
private Form mainForm, resultForm;
private TextField URL= new TextField(null, defaultURL, 250, TextField.URL);
private StringItem resultItem;
public HttpOKMIDlet() {
display = Display.getDisplay(this);
}
public void startApp() {
mainForm = new Form("Test");
mainForm.append(URL);
mainForm.addCommand(sendCommand);
mainForm.addCommand(exitCommand);
mainForm.setCommandListener(this);
display.setCurrent(mainForm);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
if (c == sendCommand) {
String result = "";
resultItem = new StringItem(null, result);
resultForm = new Form("Result");
String URLString = URL.getString();
try {
result = requestUsingGET(URLString);
} catch (IOException e) {
result = "Falied";
}
resultItem.setText(result);
resultForm.append(resultItem);
resultForm.addCommand(backCommand);
resultForm.setCommandListener(this);
display.setCurrent(resultForm);
} else if (c == backCommand) {
URL.setString(defaultURL);
display.setCurrent(mainForm);
} else {
destroyApp(false);
notifyDestroyed();
}
}
private String requestUsingGET(String URLString) throws IOException {
HttpConnection hpc = null;
String content = "";
try {
hpc = (HttpConnection) Connector.open(URLString);
int status = hpc.getResponseCode();
if (status != HttpConnection.HTTP_OK)
content = "failed";
else
content = "connected";
if (hpc != null)
hpc.close();
} catch (IOException e2) {
}
return content;
}
}</source>
Http Get with J2ME
<source lang="java">
import java.io.DataInputStream; import java.io.IOException; import javax.microedition.io.Connector; import javax.microedition.io.HttpConnection; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.StringItem; import javax.microedition.lcdui.TextField; import javax.microedition.midlet.MIDlet; public class HttpGETMIDlet extends MIDlet implements CommandListener {
private Command exitCommand = new Command("Exit", Command.EXIT, 1);
private Command sendCommand = new Command("Send", Command.OK, 1);
private Command backCommand = new Command("Upload", Command.OK, 1);
private Display display;
private String defaultURL = "http://localhost/JIDCA/hello.asp?name=JIDCA";
private Form mainForm, resultForm;
private TextField URL = new TextField(null, defaultURL, 250, TextField.URL);
private StringItem resultItem;
public HttpGETMIDlet() {
display = Display.getDisplay(this);
}
public void startApp() {
mainForm = new Form("Address");
mainForm.append(URL);
mainForm.addCommand(sendCommand);
mainForm.addCommand(exitCommand);
mainForm.setCommandListener(this);
display.setCurrent(mainForm);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
if (c == sendCommand) {
String result = "";
resultItem = new StringItem(null, result);
resultForm = new Form("Result");
String URLString = URL.getString();
try {
result = requestUsingGET(URLString);
} catch (IOException e) {
result = "Falied";
}
resultItem.setText(result);
resultForm.append(resultItem);
resultForm.addCommand(backCommand);
resultForm.setCommandListener(this);
display.setCurrent(resultForm);
} else if (c == backCommand) {
URL.setString(defaultURL);
display.setCurrent(mainForm);
} else {
destroyApp(false);
notifyDestroyed();
}
}
private String requestUsingGET(String URLString) throws IOException {
HttpConnection hpc = null;
DataInputStream dis = null;
boolean newline = false;
String content = "";
try {
hpc = (HttpConnection) Connector.open(URLString);
dis = new DataInputStream(hpc.openInputStream());
int character;
while ((character = dis.read()) != -1) {
if ((char) character == "\\") {
newline = true;
continue;
} else {
if ((char) character == "n" && newline) {
content += "\n";
newline = false;
} else if (newline) {
content += "\\" + (char) character;
newline = false;
} else {
content += (char) character;
newline = false;
}
}
}
if (hpc != null)
hpc.close();
if (dis != null)
dis.close();
} catch (IOException e2) {
}
return content;
}
}</source>
Http header
<source lang="java">
import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import javax.microedition.io.Connector; import javax.microedition.io.HttpConnection; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.StringItem; import javax.microedition.lcdui.TextField; import javax.microedition.midlet.MIDlet; public class HttpHEADMIDlet extends MIDlet implements CommandListener {
private Command exitCommand = new Command("Exit", Command.EXIT, 1);
private Command sendCommand= new Command("Send", Command.OK, 1);
private Command backCommand = new Command("Upload", Command.OK, 1);
private Display display;
private String defaultURL = "http://localhost/";
private Form mainForm, resultForm;
private TextField URL= new TextField(null, defaultURL, 250, TextField.URL);
private StringItem resultItem;
public HttpHEADMIDlet() {
display = Display.getDisplay(this);
}
public void startApp() {
mainForm = new Form("HEDA Method");
mainForm.append(URL);
mainForm.addCommand(sendCommand);
mainForm.addCommand(exitCommand);
mainForm.setCommandListener(this);
display.setCurrent(mainForm);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
if (c == sendCommand) {
String result = "";
resultItem = new StringItem(null, result);
resultForm = new Form("Result");
String URLString = URL.getString();
try {
result = requestUsingGET(URLString);
} catch (IOException e) {
result = "Falied";
}
resultItem.setText(result);
resultForm.append(resultItem);
resultForm.addCommand(backCommand);
resultForm.setCommandListener(this);
display.setCurrent(resultForm);
} else if (c == backCommand) {
URL.setString(defaultURL);
display.setCurrent(mainForm);
} else {
destroyApp(false);
notifyDestroyed();
}
}
private String requestUsingGET(String URLString) throws IOException {
HttpConnection hpc = null;
DataInputStream dis = null;
String content = "";
try {
hpc = (HttpConnection) Connector.open(URLString);
hpc.setRequestMethod(HttpConnection.HEAD);
dis = new DataInputStream(hpc.openInputStream());
int i = 1;
String key = "";
String value = "";
while ((value = hpc.getHeaderField(i)) != null) {
key = hpc.getHeaderFieldKey(i++);
content += key + ":" + value + "\n";
}
if (hpc != null)
hpc.close();
if (dis != null)
dis.close();
} catch (IOException e2) {
}
return content;
}
}</source>
Http post
<source lang="java">
import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.io.InputStreamReader; import javax.microedition.io.Connector; import javax.microedition.io.HttpConnection; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.StringItem; import javax.microedition.lcdui.TextField; import javax.microedition.midlet.MIDlet; public class HttpPOSTMIDlet extends MIDlet implements CommandListener {
private Command exitCommand= new Command("Exit", Command.EXIT, 1);
private Command sendCommand = new Command("Send", Command.OK, 1);
private Command backCommand= new Command("Upload", Command.OK, 1);
private Display display;
private String defaultURL = "http://localhost/fetchNews.asp";
private Form mainForm, resultForm;
private TextField URL = new TextField(null, null, 250, TextField.URL);
private StringItem resultItem;
public HttpPOSTMIDlet() {
display = Display.getDisplay(this);
}
public void startApp() {
mainForm = new Form("Name");
mainForm.append(URL);
mainForm.addCommand(sendCommand);
mainForm.addCommand(exitCommand);
mainForm.setCommandListener(this);
display.setCurrent(mainForm);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
if (c == sendCommand) {
String result = "";
resultItem = new StringItem(null, result);
resultForm = new Form("Result");
String URLString = "name=" + URL.getString();
try {
result = requestUsingGET(URLString);
} catch (IOException e) {
result = "Falied";
}
resultItem.setText(result);
resultForm.append(resultItem);
resultForm.addCommand(backCommand);
resultForm.setCommandListener(this);
display.setCurrent(resultForm);
} else if (c == backCommand) {
URL.setString(defaultURL);
display.setCurrent(mainForm);
} else {
destroyApp(false);
notifyDestroyed();
}
}
private String requestUsingGET(String URLString) throws IOException {
HttpConnection hpc = null;
DataInputStream dis = null;
DataOutputStream dos = null;
boolean newline = false;
String content = "";
try {
hpc = (HttpConnection) Connector.open(defaultURL);
hpc.setRequestMethod(HttpConnection.POST);
hpc.setRequestProperty("User-Agent", "Profile/MIDP-1.0 Configuration/CLDC-1.0");
hpc.setRequestProperty("Content-Language", "zh-tw");
hpc.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
hpc.setRequestProperty("Content-Length", String.valueOf(URLString.length()));
dos = new DataOutputStream(hpc.openOutputStream());
dos.write(URLString.getBytes());
dos.flush();
InputStreamReader xdis = new InputStreamReader(hpc.openInputStream());
int character;
while ((character = xdis.read()) != -1) {
if ((char) character == "\\") {
newline = true;
continue;
} else {
if ((char) character == "n" && newline) {
content += "\n";
newline = false;
} else if (newline) {
content += "\\" + (char) character;
newline = false;
} else {
content += (char) character;
newline = false;
}
}
}
if (hpc != null)
hpc.close();
if (dis != null)
dis.close();
} catch (IOException e2) {
}
return content;
}
}</source>
Image Loader
<source lang="java">
import java.io.DataInputStream; import java.io.IOException; import javax.microedition.io.Connector; import javax.microedition.io.HttpConnection; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.Image; import javax.microedition.lcdui.ImageItem; import javax.microedition.midlet.MIDlet; public class J2MEImageLoader extends MIDlet implements CommandListener, Runnable {
private Display mDisplay;
private Form mForm = new Form("Connecting...");
public J2MEImageLoader() {
mForm.addCommand(new Command("Exit", Command.EXIT, 0));
mForm.setCommandListener(this);
}
public void startApp() {
mDisplay = Display.getDisplay(this);
mDisplay.setCurrent(mForm);
Thread t = new Thread(this);
t.start();
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
if (c.getCommandType() == Command.EXIT)
notifyDestroyed();
}
public void run() {
HttpConnection hc = null;
DataInputStream in = null;
try {
hc = (HttpConnection) Connector.open("http://www.y.ru/image.gif");
int length = (int) hc.getLength();
byte[] data = null;
if (length != -1) {
data = new byte[length];
in = new DataInputStream(hc.openInputStream());
in.readFully(data);
} else {
int chunkSize = 512;
int index = 0;
int readLength = 0;
in = new DataInputStream(hc.openInputStream());
data = new byte[chunkSize];
do {
if (data.length < index + chunkSize) {
byte[] newData = new byte[index + chunkSize];
System.arraycopy(data, 0, newData, 0, data.length);
data = newData;
}
readLength = in.read(data, index, chunkSize);
index += readLength;
} while (readLength == chunkSize);
length = index;
}
Image image = Image.createImage(data, 0, length);
ImageItem imageItem = new ImageItem(null, image, 0, null);
mForm.append(imageItem);
mForm.setTitle("Done.");
} catch (IOException ioe) {
mForm.setTitle("Error.");
}
}
}</source>
Load image from a URL
<source lang="java">
import java.io.DataInputStream; import java.io.IOException; import javax.microedition.io.Connector; import javax.microedition.io.HttpConnection; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.Image; import javax.microedition.lcdui.ImageItem; import javax.microedition.lcdui.Item; import javax.microedition.lcdui.StringItem; import javax.microedition.lcdui.TextField; import javax.microedition.midlet.MIDlet; public class HttpMIDlet extends MIDlet implements CommandListener {
private Command exitCommand = new Command("Exit", Command.EXIT, 1);
private Command sendCommand = new Command("Send", Command.OK, 1);
private Command backCommand = new Command("Upload", Command.OK, 1);
private Display display;
private String URL = "http://localhost/Java.png";
private Form mainForm, resultForm;
private Item mItem;
private TextField URLField = new TextField(null, URL, 250, TextField.URL);
public HttpMIDlet() {
display = Display.getDisplay(this);
}
public void startApp() {
mainForm = new Form("Address");
mainForm.append(URLField);
mainForm.addCommand(sendCommand);
mainForm.addCommand(exitCommand);
mainForm.setCommandListener(this);
display.setCurrent(mainForm);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
if (c == sendCommand) {
resultForm = new Form("Image");
String URLString = URLField.getString();
try {
Image image = loadImage(URLString);
mItem = new ImageItem(null, image, 0, null);
} catch (IOException ioe) {
mItem = new StringItem(null, ioe.toString());
}
resultForm.append(mItem);
resultForm.addCommand(backCommand);
resultForm.setCommandListener(this);
display.setCurrent(resultForm);
} else if (c == backCommand) {
URLField.setString(URL);
display.setCurrent(mainForm);
} else {
destroyApp(false);
notifyDestroyed();
}
}
public Image loadImage(String url) throws IOException {
HttpConnection hpc = null;
DataInputStream dis = null;
try {
hpc = (HttpConnection) Connector.open(url);
int length = (int) hpc.getLength();
byte[] data = new byte[length];
dis = new DataInputStream(hpc.openInputStream());
dis.readFully(data);
return Image.createImage(data, 0, data.length);
} finally {
if (hpc != null)
hpc.close();
if (dis != null)
dis.close();
}
}
}</source>
URL query
<source lang="java">
import java.io.IOException; import javax.microedition.io.Connector; import javax.microedition.io.HttpConnection; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.StringItem; import javax.microedition.lcdui.TextField; import javax.microedition.midlet.MIDlet; public class ConnectHttpMIDlet extends MIDlet implements CommandListener {
private Command exitCommand = new Command("Exit", Command.EXIT, 1);
private Command sendCommand= new Command("Send", Command.OK, 1);
private Command backCommand = new Command("Upload", Command.OK, 1);
private Display display;
private String defaultURL = "http://www.g.ru/p=MDIP&u=b&y=y&hc=0&hs=0";
private Form mainForm, resultForm;
private TextField URL = new TextField(null, defaultURL, 250, TextField.URL);
private StringItem resultItem;
public ConnectHttpMIDlet() {
display = Display.getDisplay(this);
}
public void startApp() {
mainForm = new Form("Data");
mainForm.append(URL);
mainForm.addCommand(sendCommand);
mainForm.addCommand(exitCommand);
mainForm.setCommandListener(this);
display.setCurrent(mainForm);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
if (c == sendCommand) {
String result = "";
resultItem = new StringItem(null, result);
resultForm = new Form("Result");
String URLString = URL.getString();
try {
result = requestUsingGET(URLString);
} catch (IOException e) {
result = "failed";
}
resultItem.setText(result);
resultForm.append(resultItem);
resultForm.addCommand(backCommand);
resultForm.setCommandListener(this);
display.setCurrent(resultForm);
} else if (c == backCommand) {
URL.setString(defaultURL);
display.setCurrent(mainForm);
} else {
destroyApp(false);
notifyDestroyed();
}
}
private String requestUsingGET(String URLString) throws IOException {
HttpConnection hpc = null;
String content = "";
try {
hpc = (HttpConnection) Connector.open(URLString);
content += "URL: " + hpc.getURL() + "\n";
content += "Protocol: " + hpc.getProtocol() + "\n";
content += "Host: " + hpc.getHost() + "\n";
content += "Port: " + hpc.getPort() + "\n";
content += "File: " + hpc.getFile() + "\n";
content += "Query: " + hpc.getQuery() + "\n";
content += "reference: " + hpc.getRef() + "\n";
content += "request method: " + hpc.getRequestMethod();
if (hpc != null)
hpc.close();
} catch (IOException e2) {
}
return content;
}
}</source>
