If this is client side code, you can't use java.net as the code gets compiled to JavaScript - I'd suggest you read the documentation for GWT to get a feel of what you can and can't do, in particular what is included in the JRE Emulation for GWT: http://code.google.com/intl/sv-SE/webtoolkit/doc/1.6/RefJreEmulation.html
You should also check you the RequestBuilder class which allows you to make calls to a server from your code, BUT, as this will be from a browser you will need to be aware of the Single Origin Policy - i.e. your code can only make a call back to the server from which it came. So in your case, if your GWT application is served from hellworld.appspot.com your would be ok, if not, then you can't. //Adam On 24 Apr, 04:41, satish <satish...@gmail.com> wrote: > I am using GWT plugin for eclipse and trying to build an test > application to be deployed on app engine. I am relatively new to Java > and App Engine. I have import java.net.* statement declared but when I > run the program in hosted browser mode, I get the error - Line 5: The > import java.net cannot be resolved. I don't get any error for java.io > or java.util.ArrayList imports. What am i doing wrong? Thank you. > > Here is the program. getJoke() method needs classes from java.net. > > package com.google.gwt.sample.stockwatcher.client; > > import java.io.*; > import java.net.*; > import java.util.ArrayList; > > import com.google.gwt.core.client.EntryPoint; > import com.google.gwt.event.dom.client.ClickEvent; > import com.google.gwt.event.dom.client.ClickHandler; > import com.google.gwt.event.dom.client.KeyCodes; > import com.google.gwt.event.dom.client.KeyPressEvent; > import com.google.gwt.event.dom.client.KeyPressHandler; > import com.google.gwt.user.client.Window; > import com.google.gwt.user.client.ui.Button; > import com.google.gwt.user.client.ui.FlexTable; > import com.google.gwt.user.client.ui.HorizontalPanel; > import com.google.gwt.user.client.ui.Label; > import com.google.gwt.user.client.ui.RootPanel; > import com.google.gwt.user.client.ui.TextBox; > import com.google.gwt.user.client.ui.VerticalPanel; > > public class StockWatcher implements EntryPoint { > > private VerticalPanel mainPanel = new VerticalPanel(); > private FlexTable stocksFlexTable = new FlexTable(); > private HorizontalPanel addPanel = new HorizontalPanel(); > private TextBox newSymbolTextBox = new TextBox(); > private Button addStockButton = new Button("Add"); > private Label lastUpdatedLabel = new Label(); > private ArrayList<String> stocks = new ArrayList<String>(); > private TextBox jokeTextBox = new TextBox(); > private Button getJokeButton = new Button("Get Joke"); > private HorizontalPanel jokePanel = new HorizontalPanel(); > > /** > * Entry point method. > */ > public void onModuleLoad() { > // Create table for stock data. > stocksFlexTable.setText(0, 0, "Symbol"); > stocksFlexTable.setText(0, 1, "Price"); > stocksFlexTable.setText(0, 2, "Change"); > stocksFlexTable.setText(0, 3, "Remove"); > > // Assemble Add Stock panel. > addPanel.add(newSymbolTextBox); > addPanel.add(addStockButton); > > //Assmeble Joke Panel > addPanel.add(getJokeButton); > addPanel.add(jokeTextBox); > > // Assemble Main panel. > mainPanel.add(stocksFlexTable); > mainPanel.add(addPanel); > mainPanel.add(jokePanel); > mainPanel.add(lastUpdatedLabel); > > // Associate the Main panel with the HTML host page. > RootPanel.get("stockList").add(mainPanel); > > // Move cursor focus to the input box. > newSymbolTextBox.setFocus(true); > // Listen for mouse events on the Add button. > addStockButton.addClickHandler(new ClickHandler() { > public void onClick(ClickEvent event) { > addStock(); > } > }); > > // Listen for keyboard events in the input box. > newSymbolTextBox.addKeyPressHandler(new KeyPressHandler() { > public void onKeyPress(KeyPressEvent event) { > if (event.getCharCode() == KeyCodes.KEY_ENTER) { > addStock(); > } > } > }); > > // Listen for mouse events on the getJoke button. > getJokeButton.addClickHandler(new ClickHandler() { > public void onClick(ClickEvent event) { > getJoke(); > } > }); > > } > > /** > * Add stock to FlexTable. Executed when the user clicks the > addStockButton or > * presses enter in the newSymbolTextBox. > */ > private void addStock() { > final String symbol = > newSymbolTextBox.getText().toUpperCase > ().trim(); > newSymbolTextBox.setFocus(true); > > // Stock code must be between 1 and 10 chars that are > numbers, > letters, or dots. > if (!symbol.matches("^[0-9a-zA-Z\\.]{1,10}$")) { > Window.alert("'" + symbol + "' is not a valid symbol."); > newSymbolTextBox.selectAll(); > return; > } > > newSymbolTextBox.setText(""); > > // Don't add the stock if it's already in the table. > if (stocks.contains(symbol)) > return; > > // Add the stock to the table. > int row = stocksFlexTable.getRowCount(); > stocks.add(symbol); > stocksFlexTable.setText(row, 0, symbol); > > // Add a button to remove this stock from the table. > Button removeStockButton = new Button("x"); > removeStockButton.addClickHandler(new ClickHandler() { > public void onClick(ClickEvent event) { > int removedIndex = stocks.indexOf(symbol); > stocks.remove(removedIndex); > stocksFlexTable.removeRow(removedIndex + 1); > } > }); > stocksFlexTable.setWidget(row, 3, removeStockButton); > > // TODO Get the stock price. > > } > > private void getJoke() { > //jokeTextBox.setText("Joke Button Clicked"); > > try { > String message = URLEncoder.encode("joke", "UTF-8"); > URL url = new URL("http://hellworld.appspot.com"); > HttpURLConnection connection = (HttpURLConnection) > url.openConnection(); > connection.setDoOutput(true); > connection.setRequestMethod("POST"); > > OutputStreamWriter writer = new OutputStreamWriter > (connection.getOutputStream()); > writer.write("request=" + message); > writer.close(); > > if (connection.getResponseCode() == > HttpURLConnection.HTTP_OK) { > // OK > jokeTextBox.setText(connection.getResponseMessage()); > } else { > // Server returned HTTP error code. > jokeTextBox.setText("Error"); > } > } catch (MalformedURLException e) { > // ... > jokeTextBox.setText("Error"); > } catch (IOException e) { > // ... > jokeTextBox.setText("Error"); > } > > } > > } --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. 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