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");
}
}
}
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