关于BeanUtils中的问题... - 黑马程序员技术交流社区

package com.itheima.day1;
import java.util.Date;
public class ReflectPoint {
private Date birthday = new Date();
public Date getBrithday() {
return birthday;
}
public void setBrithday(Date brithday) {
this.birthday = brithday;
}
private int x;
public int y;
public String str1 = "ball";
public String str2 = "basketball";
public String str3 = "itcast";
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;
}
public ReflectPoint(int x, int y) {
super();
this.x = x;
this.y = y;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + x;
result = prime * result + y;
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
ReflectPoint other = (ReflectPoint) obj;
if (x != other.x)
return false;
if (y != other.y)
return false;
return true;
}
@Override
public String toString() {
return "ReflectPoint [str1=" + str1 + ", str2=" + str2 + ", str3="
+ str3 + "]";
}
}

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package com.itheima.day1;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.apache.commons.beanutils.BeanUtils;
public class IntroSpectorTest1 {
public static void main(String[] args)throws Exception {
// TODO Auto-generated method stub
ReflectPoint pt1 = new ReflectPoint(3,5);
String propertyName = "x";
Object retVal = getProperty(pt1, propertyName);
System.out.println(retVal);
Object value = 7;
//通过BeanUtils工具包可以直接对相应对象进行getProperty()和setProperty()操作
setProperty(pt1, propertyName, value);
System.out.println(BeanUtils.getArrayProperty(pt1, "x").getClass().getName());
BeanUtils.setProperty(pt1,"x","9");
System.out.println(pt1.getX());//setProperty设置某个对象的哪个属性，并将其设置成某个值
BeanUtils.setProperty(pt1, "birthday.time", "111");
System.out.println(BeanUtils.getProperty(pt1, "birthday.time"));
}
//设置value的值
private static void setProperty(Object pt1, String propertyName,
Object value) throws IntrospectionException,
IllegalAccessException, InvocationTargetException {
PropertyDescriptor pd2 = new PropertyDescriptor(propertyName,pt1.getClass());
Method methodSetX = pd2.getWriteMethod();
methodSetX.invoke(pt1, value);
}
//获取methodGetX的值
private static Object getProperty(Object pt1, String propertyName)
throws IntrospectionException, IllegalAccessException,
InvocationTargetException {
PropertyDescriptor pd = new PropertyDescriptor(propertyName,pt1.getClass());
Method methodGetX = pd.getReadMethod();
Object retVal = methodGetX.invoke(pt1);
return retVal;
}
}

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