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JavaBean简单来说是具有setter和getter方法的特殊类，该类将属性隐藏，并对外提供setter和getter方法。
示例：
packagecn.itcast.day1;
importjava.util.Date;
public class ReflectPoint {
private Date birthday=new Date();
private int x;
public int y;
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String str1="ball";
public String str2="basketball";
public String str3="itcast";
public ReflectPoint(int x, int y) {
super();
this.x = x;
this.y = y;
}
@Override
public String toString(){
return str1+":"+str2+":"+str3;
}
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
public int getY() {
return y;
}
public void setY(int y) {
this.y = y;
}
}
2、package cn.itcast.day1;
mportjava.beans.IntrospectionException;
importjava.beans.PropertyDescriptor;
importjava.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
importorg.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.PropertyUtils;
public class IntroSpectorTest {
publicstatic void main(String[] args) throws Exception{
ReflectPointpt1=new ReflectPoint(3,5);
//实用方法1，调用BeanUtils提供的工具，需要导入BeanUtils.jar包
System.out.println(BeanUtils.getProperty(pt1,"x").getClass().getName());
BeanUtils.setProperty(pt1,"x", "9");
System.out.println(pt1.getX());
BeanUtils.setProperty(pt1, "birthday.time","11");
System.out.println(BeanUtils.getProperty(pt1,"birthday.time"));
//实用方法2：PropertyUtils，也需要导入PropertyUtils.jar包
PropertyUtils.setProperty(pt1,"x", 9);//PropertyUtils与BeanUtils有所不同，参数与源参数保持一致
System.out.println(PropertyUtils.getProperty(pt1,"x").getClass());
}