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<html><head><title>Display page for BeanDumper at www.BruceEckel.com</title></head><FONT FACE="Verdana,Tahoma,Arial,Helvetica,Sans"><H2>BeanDumper.java</H2><hr></FONT>
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width="600" height="500" align="baseline"
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<EMBED type="application/x-java-applet;version=1.2.2"
width="600" height="500" align="baseline"
code="BeanDumper.class"
codebase="."
pluginspage="http://java.sun.com/products/plugin/1.2/plugin-install.html">
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No Java 2 support for APPLET!!
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<FONT SIZE="+3"><PRE><B>
//: c13:BeanDumper.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Introspecting a Bean.
// <applet code=BeanDumper width=600 height=500>
// </applet>
import java.beans.*;
import java.lang.reflect.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import com.bruceeckel.swing.*;
public class BeanDumper extends JApplet {
JTextField query =
new JTextField(20);
JTextArea results = new JTextArea();
public void prt(String s) {
results.append(s + "\n");
}
public void dump(Class bean){
results.setText("");
BeanInfo bi = null;
try {
bi = Introspector.getBeanInfo(
bean, java.lang.Object.class);
} catch(IntrospectionException e) {
prt("Couldn't introspect " +
bean.getName());
return;
}
PropertyDescriptor[] properties =
bi.getPropertyDescriptors();
for(int i = 0; i < properties.length; i++) {
Class p = properties[i].getPropertyType();
prt("Property type:\n " + p.getName() +
"Property name:\n " +
properties[i].getName());
Method readMethod =
properties[i].getReadMethod();
if(readMethod != null)
prt("Read method:\n " + readMethod);
Method writeMethod =
properties[i].getWriteMethod();
if(writeMethod != null)
prt("Write method:\n " + writeMethod);
prt("====================");
}
prt("Public methods:");
MethodDescriptor[] methods =
bi.getMethodDescriptors();
for(int i = 0; i < methods.length; i++)
prt(methods[i].getMethod().toString());
prt("======================");
prt("Event support:");
EventSetDescriptor[] events =
bi.getEventSetDescriptors();
for(int i = 0; i < events.length; i++) {
prt("Listener type:\n " +
events[i].getListenerType().getName());
Method[] lm =
events[i].getListenerMethods();
for(int j = 0; j < lm.length; j++)
prt("Listener method:\n " +
lm[j].getName());
MethodDescriptor[] lmd =
events[i].getListenerMethodDescriptors();
for(int j = 0; j < lmd.length; j++)
prt("Method descriptor:\n " +
lmd[j].getMethod());
Method addListener =
events[i].getAddListenerMethod();
prt("Add Listener Method:\n " +
addListener);
Method removeListener =
events[i].getRemoveListenerMethod();
prt("Remove Listener Method:\n " +
removeListener);
prt("====================");
}
}
class Dumper implements ActionListener {
public void actionPerformed(ActionEvent e) {
String name = query.getText();
Class c = null;
try {
c = Class.forName(name);
} catch(ClassNotFoundException ex) {
results.setText("Couldn't find " + name);
return;
}
dump(c);
}
}
public void init() {
Container cp = getContentPane();
JPanel p = new JPanel();
p.setLayout(new FlowLayout());
p.add(new JLabel("Qualified bean name:"));
p.add(query);
cp.add(BorderLayout.NORTH, p);
cp.add(new JScrollPane(results));
Dumper dmpr = new Dumper();
query.addActionListener(dmpr);
query.setText("frogbean.Frog");
// Force evaluation
dmpr.actionPerformed(
new ActionEvent(dmpr, 0, ""));
}
public static void main(String[] args) {
Console.run(new BeanDumper(), 600, 500);
}
} ///:~
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