//: BeanDumper.java // A method to introspect a bean import java.beans.*; import java.lang.reflect.*; public class BeanDumper { public static void dump(Class bean){ BeanInfo bi = null; try { bi = Introspector.getBeanInfo( bean, java.lang.Object.class); } catch(IntrospectionException ex) { System.out.println("Couldn't introspect " + bean.getName()); System.exit(1); } PropertyDescriptor properties[] = bi.getPropertyDescriptors(); for(int i = 0; i < properties.length; i++) { Class p = properties[i].getPropertyType(); System.out.println( "Property type:\n " + p.getName()); System.out.println( "Property name:\n " + properties[i].getName()); Method readMethod = properties[i].getReadMethod(); if(readMethod != null) System.out.println( "Read method:\n " + readMethod.toString()); Method writeMethod = properties[i].getWriteMethod(); if(writeMethod != null) System.out.println( "Write method:\n " + writeMethod.toString()); System.out.println("===================="); } System.out.println("Public methods:"); MethodDescriptor methods[] = bi.getMethodDescriptors(); for(int i = 0; i < methods.length; i++) System.out.println( methods[i].getMethod().toString()); System.out.println("======================"); System.out.println("Event support:"); EventSetDescriptor events[] = bi.getEventSetDescriptors(); for(int i = 0; i < events.length; i++) { System.out.println("Listener type:\n " + events[i].getListenerType().getName()); Method lm[] = events[i].getListenerMethods(); for(int j = 0; j < lm.length; j++) System.out.println( "Listener method:\n " + lm[j].getName()); MethodDescriptor lmd[] = events[i].getListenerMethodDescriptors(); for(int j = 0; j < lmd.length; j++) System.out.println( "Method descriptor:\n " + lmd[j].getMethod().toString()); Method addListener = events[i].getAddListenerMethod(); System.out.println( "Add Listener Method:\n " + addListener.toString()); Method removeListener = events[i].getRemoveListenerMethod(); System.out.println( "Remove Listener Method:\n " + removeListener.toString()); System.out.println("===================="); } } // Dump the class of your choice: public static void main(String args[]) { if(args.length < 1) { System.err.println("usage: \n" + "BeanDumper fully.qualified.class"); System.exit(0); } Class c = null; try { c = Class.forName(args[0]); } catch(ClassNotFoundException ex) \{ System.err.println( "Couldn't find " + args[0]); System.exit(0); } dump(c); }
Java Alley | JavaBeans from Square One (Web Techniques, Sep 1997)
Related Reading
More Insights
INFO-LINK
To upload an avatar photo, first complete your Disqus profile. | View the list of supported HTML tags you can use to style comments. | Please read our commenting policy. | |