beandumper.java

来自「翁剀JAVA语言那门课程的教案 很多人都看多他的视频教程可惜没有ppt的教案」· Java 代码 · 共 96 行

//: 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);
	}
} ///:~