I'm trying to run a Perl script when I push a button on a JFrame. I read around and realize that I need to use Runtime.exec() to run a command, and this works in the following code:
import java.io.IOException;
public class Charts {
public static void main(String args[]) {
try {
Runtime.getRuntime().exec("perl C:/Users/ryanm/Documents/updateCharts.pl");
} catch (IOException e) {
System.out.println (e.toString());
}
}
}
However, if I place this code in the ActionEvent for a button on a jframe it doesn't work:
import java.io.IOException;
...
...
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
try {
Runtime.getRuntime().exec("perl C:/Users/ryanm/Documents/updateCharts.pl");
System.out.println ("Execute");
} catch (IOException e) {
System.out.println (e.toString());
}
}
...
...
The print statement in the try block prints out when I click the button, so I'm not sure what's wrong here.
Thanks for any help!
Related
How to detect every mouse event in system using java?
I have tried using Point class to catch mouse motion but that thing was not so convenient.
import org.jnativehook.GlobalScreen;
import org.jnativehook.NativeHookException;
import org.jnativehook.keyboard.NativeKeyEvent;
import org.jnativehook.keyboard.NativeKeyListener;
class GlobalKeyListenerExample implements NativeKeyListener {
public void nativeKeyPressed(NativeKeyEvent e) {
System.out.println("Key Pressed: " + NativeKeyEvent.getKeyText(e.getKeyCode()));
if (e.getKeyCode() == NativeKeyEvent.VK_ESCAPE) {
}
}
public void nativeKeyReleased(NativeKeyEvent e) {
System.out.println("Key Released: " + NativeKeyEvent.getKeyText(e.getKeyCode()));
}
public void nativeKeyTyped(NativeKeyEvent e) {
System.out.println("Key Typed: " + e.getKeyText(e.getKeyCode()));
}
public GlobalKeyListenerExample()
{
try {
GlobalScreen.registerNativeHook();
}
catch (NativeHookException ex) {
System.err.println("There was a problem registering the native hook.");
System.err.println(ex.getMessage());
System.exit(1);
}
GlobalScreen.getInstance().addNativeKeyListener(this);
}
public static void main(String[] args) {
try {
GlobalScreen.registerNativeHook();
}
catch (NativeHookException ex) {
System.err.println("There was a problem registering the native hook.");
System.err.println(ex.getMessage());
System.exit(1);
}
//Construct the example object and initialze native hook.
GlobalScreen.getInstance().addNativeKeyListener(new GlobalKeyListenerExample());
}
}
I am unable to catch the STException thrown by the STGroupFile. This is a problem. I need to abort if the template is bad. To reproduce this problem, I have this incorrect template file called tmp.stg:
temp1(param1)::=<<
%if(param1)%
%param1:{%temp2(p)%}; separator"\n"%
%endif%
>>
And this groovy code to process it:
#!/usr/bin/env groovy
#Grab(group="org.antlr", module="ST4", version="4.0.8")
import org.stringtemplate.v4.STGroupFile;
import org.stringtemplate.v4.NumberRenderer;
public class Gex {
public static void main(String [] args) {
System.out.println("Processing...")
File fn = new File("tmp.stg")
STGroupFile group;
try {
group = new STGroupFile(fn.toString());
} catch (Throwable e) {
throw new Exception("Caught first exception");
}
try {
group.registerRenderer(Integer.class, new NumberRenderer());
} catch (Throwable e) {
throw new Exception("Caught second exception");
}
throw new Exception("You should not see this");
}
}
Gex.main()
When I run that script, I get an error message but I cannot catch the exception:
can't load group file file:tmp.stg
The error message comes from STGroupFile.java:
throw new STException("can't load group file "+fileName, e);
But I am unable to catch this exception. How can I catch this exception and abort?
Following the advice of The ANTLR Guy, I extended the STErrorListener to throw an exception instead of printing a message to stderr. It looks like this:
File: lib/GexListener.groovy
import org.stringtemplate.v4.STErrorListener;
import org.stringtemplate.v4.misc.STMessage;
import org.stringtemplate.v4.misc.ErrorType;
class GexListener implements STErrorListener {
#Override
public void compileTimeError(STMessage msg) {
throw new Exception(msg.toString());
}
#Override
public void runTimeError(STMessage msg) {
if ( msg.error != ErrorType.NO_SUCH_PROPERTY ) { // ignore these
throw new Exception(msg.toString());
}
}
#Override
public void IOError(STMessage msg) {
throw new Exception(msg.toString());
}
#Override
public void internalError(STMessage msg) {
throw new Exception(msg.toString());
}
public void error(String s) { error(s, null); }
public void error(String s, Throwable e) {
System.err.println(s);
if ( e!=null ) {
throw new Exception(msg.toString());
}
}
}
Then the master script bin/gex.groovy looks like this:
#!/bin/bash
//usr/bin/env groovy -cp ${0%/*}/../lib "$0" "$#"; exit $?
#Grab(group="org.antlr", module="ST4", version="4.0.8")
import org.stringtemplate.v4.STGroupFile;
import org.stringtemplate.v4.NumberRenderer;
import GexListener
public class Gex {
public static void main(String [] args) {
System.out.println("Processing...")
File fn = new File("tmp.stg")
STGroupFile group;
GexListener listener = new GexListener();
group = new STGroupFile(fn.toString());
group.setListener(listener);
group.registerRenderer(Integer.class, new NumberRenderer());
System.out.println("You should not see this line")
}
}
Gex.main()
When it executes, there is a nasty side effect where the stacktrace is printed twice, but the program aborts before printing the last sentence "You should not see this line", which is the desired behaviour.
As you pointed out in a separate email: "I discovered that the exception is actually caught and not re-thrown. This happens inside STGroup.java:"
catch (Exception e) {
errMgr.IOError(null, ErrorType.CANT_LOAD_GROUP_FILE, e, fileName);
}
Why not override the IOError function (or a function in the listener that it calls?) to just re-throw e?
I have the follow code:
import org.eclipse.swt.widgets.Display;
public class ProvaShow {
public static void main(String[] args) {
try {
ProvaShow window = new ProvaShow();
window.open();
} catch (Exception e) {
e.printStackTrace();
}
}
public void open() throws InterruptedException {
Display display = Display.getDefault();
Shell shell = new Shell();
shell.setSize(450, 300);
shell.setText("SWT Application");
Thread.sleep(3000);
shell.open();
shell.layout();
shell.forceActive();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
}
}
If is open another application (es. browser web), how do I can force to show to the window that I running?
If you want to show the window for 3 seconds and then close it, then replace Thread.sleep(3000); with
display.timerExec(3000, new Runnable() {
#Override
public void run() {
shell.dispose();
}
});
and make the shell final...
I have the same problem as described in the question Call getPage from htmlunit WebClient with JavaScript disabled and setTimeout set to 10000 waits forever.
There is only one relevant (complicated) possible answer there (by theytoo). So I was wondering if:
Does someone have a simpler answer?
Can someone verify the solution works?
Code I used:
package main;
import java.io.IOException;
import java.net.MalformedURLException;
import com.gargoylesoftware.htmlunit.FailingHttpStatusCodeException;
import com.gargoylesoftware.htmlunit.WebClient;
public class Test {
public static void main(final String[] args) {
final WebClient webClient = new WebClient();
webClient.setTimeout(1000);
try {
System.out.println("Querying");
webClient.getPage("http://www.google.com");
System.out.println("Success");
} catch (final FailingHttpStatusCodeException e) {
System.out.println("One");
e.printStackTrace();
} catch (final MalformedURLException e) {
System.out.println("Two");
e.printStackTrace();
} catch (final IOException e) {
System.out.println("Three");
e.printStackTrace();
} catch (final Exception e) {
System.out.println("Four");
e.printStackTrace();
}
System.out.println("Finished");
}
}
Output (removed all CSS and JS warnings):
Querying
Success
Finished
After changing timeout from 1000 to 1 (I won't hit google in less than 1 ms):
Querying
Three
org.apache.http.conn.ConnectTimeoutException: Connect to www.google.com:80 timed out
at com.gargoylesoftware.htmlunit.SocksSocketFactory.connectSocket(SocksSocketFactory.java:92)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:148)
at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:149)
at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:121)
at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:573)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:425)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:776)
at com.gargoylesoftware.htmlunit.HttpWebConnection.getResponse(HttpWebConnection.java:152)
at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseFromWebConnection(WebClient.java:1439)
at com.gargoylesoftware.htmlunit.WebClient.loadWebResponse(WebClient.java:1358)
at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:307)
at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:373)
at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:358)
at main.Test.main(Test.java:17)
Finished
Conclusion: I can't reproduce it and it works as expected
I try to use get result from a api called j-calais, and then out put the result on a web page, i write all the code in client, but it cant compile right, dont know why??? please help. the source code like below:
there is no obvious error arise, but it cant be compile successfully..... thanks a lot:
public void onModuleLoad() {
// Create table for stock data.
stocksFlexTable.setText(0, 0, "Type");
stocksFlexTable.setText(0, 1, "Name");
// Assemble Add Stock panel.
addPanel.add(newSymbolTextBox);
addPanel.add(addStockButton);
// Assemble Main panel.
mainPanel.add(stocksFlexTable);
mainPanel.add(addPanel);
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) {
try {
addStock();
} catch (Exception e) {
e.printStackTrace();
}
}
});
// Listen for keyboard events in the input box.
newSymbolTextBox.addKeyPressHandler(new KeyPressHandler() {
public void onKeyPress(KeyPressEvent event) {
if (event.getCharCode() == KeyCodes.KEY_ENTER) {
try {
addStock();
} catch (Exception e) {
e.printStackTrace();
}
}
}
});
}
private void addStock() throws Exception {
final String url_s = newSymbolTextBox.getText().toUpperCase().trim();
newSymbolTextBox.setFocus(true);
newSymbolTextBox.setText("");
int row = stocksFlexTable.getRowCount();
CalaisClient client = new CalaisRestClient("ysw5rx69jkvdnzqf6sgjduqj");
System.out.print("read success...\n");
URL url = new URL(url_s);
CalaisResponse response = client.analyze(url);
for (CalaisObject entity : response.getEntities()) {
System.out.println(entity.getField("_type") + ":"
+ entity.getField("name"));
stocks.add(entity.getField("_type"));
stocksFlexTable.setText(row, 0, entity.getField("_type"));
stocksFlexTable.setText(row, 1, entity.getField("name"));
}
for (CalaisObject topic : response.getTopics()) {
System.out.println(topic.getField("categoryName"));
}
}
}
GWT only handles unchecked exceptions so you can throw Runtime Exceptions
or write your own Exception that extends from Runtime Exception then it will not cause any compile time problem
void f() throws NullPointerException // will not cause any problem because it is Runtime exception so unchecked
void f() throws IllegalAccessException // it is checked exception so there will be problem at compile time