我尝试使用 Felix/OSGi 从 bundle jar 中获取文件作为资源。 我已阅读No access to Bundle Resource/File (OSGi)和 How to reference an included file in OSGi bundle when performing java.io.File or FileInputStream但我不明白如何获取资源。
现在我有了加载器应用程序和一个 bundle ( bundle is here )。
在 bundle 中我有激活者，他注册了服务:
public void start(BundleContext context) throws Exception {
Hashtable<String, String> props = new Hashtable<String, String>();
props.put("Funct", "MainForm");
context.registerService(MainFormInterface.class.getName(), new MainForm(), props);
ServiceReference[] refs = context.getServiceReferences(
MainFormInterface.class.getName(), "(Funct=MainForm)");
if (refs == null) {
System.out.println("Not Found MainForm on start");
} else {
MainFormInterface MainForm = (MainFormInterface) context.getService(refs[0]);
MainForm.sendContext(context);
MainForm.showWindow();
}
}
服务等级为
package ihtika2.mainform;
import ihtika2.mainform.service.MainFormInterface;
import javax.swing.SwingUtilities;
import org.osgi.framework.BundleContext;
/**
*
* @author Arthur
*/
public class MainForm implements MainFormInterface {
BundleContext context;
@Override
public void sendContext(BundleContext context) {
this.context = context;
}
IC_MainForm MainForm;
@Override
public void showWindow() {
SwingUtilities.invokeLater(new Runnable() {
// This creates of the application window.
@Override
public void run() {
MainForm = new IC_MainForm();
// MainForm.main();
MainForm.main(context);
}
});
}
表单的代码是
package ihtika2.mainform;
import com.google.code.ihtika.Vars.Ini;
import ihtika2.i_aboutform.service.AboutFormInterface;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Properties;
import javax.swing.JFrame;
import org.apache.log4j.*;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
/**
*
* @author Arthur Khusnutdinov
*/
public class IC_MainForm extends JFrame {
private static IC_MainForm localFrame;
BundleContext context;
/**
* Creates new form IC_MainForm
*/
public IC_MainForm(BundleContext context) {
initComponents();
PropertyConfigurator.configure(props());
Ini.logger = Logger.getRootLogger();
this.context = context;
}
public IC_MainForm() {
// if (Ini.goUpdate) {
// JDialog updateDialog = null;
// if (updateDialog == null) {
// updateDialog = new UpdateIhtikaClient(null);
// }
// IhtikaClientApp.getApplication().show(updateDialog);
//
// } else {
//// JOptionPane.showMessageDialog(null, "Ваша копия программы устарела"
//// + "На http://ihtik.lib.ru/ ...", "LectorInstaller", 1);
//// System.exit(0);
// show(new IhtikaClientView(this));
// }
try {
URL configURL = context.getBundle().getEntry("ihtika2/mainform/favicon_1.jpg");
System.out.println("sdfsdfsdf");
if (configURL != null) {
InputStream input = configURL.openStream();
try {
// process your input here or in separate method
} finally {
input.close();
}
}
// InputStream www = getClass().getResourceAsStream("/ihtika2/mainform/service/favicon_1.jpg");
// InputStream www = getClass().getResourceAsStream("/com/google/code/ihtika/resources/favicon_1.jpg");
// BufferedImage qqq;
// qqq = javax.imageio.ImageIO.read(www);
// this.setIconImage(qqq); // NOI18N
} catch (IOException ex) {
ex.printStackTrace();
}
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
menuBar = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
jMenuItem2 = new javax.swing.JMenuItem();
jMenuItem1 = new javax.swing.JMenuItem();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setIconImages(null);
jMenu1.setText("Главное меню");
jMenuItem2.setText("О программе");
jMenuItem2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jMenuItem2ActionPerformed(evt);
}
});
jMenu1.add(jMenuItem2);
jMenuItem1.setText("Выход");
jMenuItem1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jMenuItem1ActionPerformed(evt);
}
});
jMenu1.add(jMenuItem1);
menuBar.add(jMenu1);
setJMenuBar(menuBar);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 800, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 598, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
System.exit(0);
}
private void jMenuItem2ActionPerformed(java.awt.event.ActionEvent evt) {
try {
ServiceReference[] refs = context.getServiceReferences(
AboutFormInterface.class.getName(), "(Funct=*)");
if (refs == null) {
System.out.println("Not Found AboutForm on show");
} else {
AboutFormInterface AboutForm = (AboutFormInterface) context.getService(refs[0]);
AboutForm.showWindow();
}
} catch (Exception ex) {
Ini.logger.fatal("Error on showing AboutForm", ex);
}
}
// public void main() {
public void main(final BundleContext context) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Windows".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (Exception ex) {
Ini.logger.fatal("Error in MainForm: ", ex);
}
//</editor-fold>
// if (args.length>0 && (args[0].equals("update") || args[0].equals("updatesvn"))) {
// Ini.updateType = args[0];
// Ini.goUpdate = true;
// }
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
localFrame = new IC_MainForm(context);
localFrame.setVisible(true);
}
});
}
public static void stop() {
localFrame.setVisible(false);
localFrame.dispose();
localFrame = null;
}
private static Properties props() {
Properties props = new Properties();
props.put("log4j.rootLogger", "INFO, R");
props.put("log4j.appender.R",
"org.apache.log4j.DailyRollingFileAppender");
props.put("log4j.appender.R.File", "logs/IhtikaClient.log");
props.put("log4j.appender.R.Append", "true");
props.put("log4j.appender.R.Threshold", "INFO");
props.put("log4j.appender.R.DatePattern", "'.'yyyy-MM-dd");
props.put("log4j.appender.R.layout", "org.apache.log4j.PatternLayout");
props.put("log4j.appender.R.layout.ConversionPattern",
//"%d{HH:mm:ss,SSS} %c - %m%n");
//"[%5p] %d{yyyy-MM-dd mm:ss} (%F:%M:%L)%n%m%n%n");
"[%5p] %d{yyyy-MM-dd mm:ss} %c (%F:%M:%L)%n%m%n");
return props;
}
// Variables declaration - do not modify
private javax.swing.JMenu jMenu1;
private javax.swing.JMenuItem jMenuItem1;
private javax.swing.JMenuItem jMenuItem2;
private javax.swing.JMenuBar menuBar;
// End of variables declaration
}
现在 jpg 图像位于路径 ihtika2\mainform\favicon_1.jpg 的 bundle 中
但现在启动时显示错误
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at ihtika2.mainform.IC_MainForm.<init>(IC_MainForm.java:54)
at ihtika2.mainform.MainForm$1.run(MainForm.java:32)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:701)
at java.awt.EventQueue.access$000(EventQueue.java:102)
at java.awt.EventQueue$3.run(EventQueue.java:662)
at java.awt.EventQueue$3.run(EventQueue.java:660)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:671)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)
哪里出错了？ 谢谢，抱歉我的英语不好。
最佳答案
我认为IC_MainForm中的context为空；您没有在 IC_MainForm() 中设置它。
关于osgi - 从 OSGi 包获取资源，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11757793/