Java如何基于反射获取对象属性信息

先建立一个类，有四种属性：

private int id;
private String name;
private byte by;
private short st;

以下方法，创建一个对象，然后打印该对象的属性名字，属性值，和属性的类型：

public class T {
	public static void main(String[] args) throws Exception {
		User u = new User();
		u.setId(1);
		u.setName("cc");
		u.setBy((byte)1);
		u.setSt((short)2);
		getProperty(u);
	}
	
	@SuppressWarnings("unchecked")
	public static void getProperty(Object entityName) throws Exception {
		Class c = entityName.getClass();
		Field field[] = c.getDeclaredFields();
		for (Field f : field) {
			Object v = invokeMethod(entityName, f.getName(), null);
			System.out.println(f.getName() + "t" + v + "t" + f.getType());
		}
	}
	
	@SuppressWarnings("unchecked")
	private static Object invokeMethod(Object owner, String methodName,
			Object[] args) throws Exception {
		Class ownerClass = owner.getClass();
		methodName = methodName.substring(0, 1).toUpperCase()
				+ methodName.substring(1);
		Method method = null;
		try {
			method = ownerClass.getMethod("get" + methodName);
		} catch (SecurityException e) {
		} catch (NoSuchMethodException e) {
			return " can't find 'get" + methodName + "' method";
		}
		return method.invoke(owner);
	}
}

打印结果如下：

id 1 int
name cc class java.lang.String
by 1 byte
st 2 short

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