黑马程序员---内省JavaBean

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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());

}

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