使用BeanUtils操作属性的一个小坑

import java.lang.reflect.InvocationTargetException; import org.apache.commons.beanutils.BeanUtils; public class Test { public static void main(String[] args) { try { String echoVal = ""; // //InsidePack insidePack = new InsidePack(); //BeanUtils.setProperty(insidePack, "x", 12);//异常 //echoVal = BeanUtils.getProperty(insidePack, "x");//异常 //System.out.println("InsidePack" + echoVal); // //PriSubClass priSubClass = new PriSubClass(); //BeanUtils.setProperty(priSubClass, "x", 24);//异常 //echoVal = BeanUtils.getProperty(priSubClass, "x");//异常 //System.out.println("PriSubClass" + echoVal); // //ProSubClass proSubClass = new ProSubClass(); //BeanUtils.setProperty(proSubClass, "x", 36);//异常 //echoVal = BeanUtils.getProperty(proSubClass, "x");//异常 //System.out.println("ProSubClass" + echoVal); // PubSubClass pubSubClass = new PubSubClass(); BeanUtils.setProperty(pubSubClass, "x", 48); echoVal = BeanUtils.getProperty(pubSubClass, "x"); System.out.println("PubSubClass" + echoVal); // Outer outer = new Outer(); BeanUtils.setProperty(outer, "x", 60); echoVal = BeanUtils.getProperty(outer, "x"); System.out.println("Outer" + echoVal); // //OutPack outPack = new OutPack(); //BeanUtils.setProperty(outPack, "x", 72);//异常 //echoVal = BeanUtils.getProperty(outPack, "x");//异常 //System.out.println("OutPack" + echoVal); } catch(IllegalAccessException e) { e.printStackTrace(); } catch(InvocationTargetException e) { e.printStackTrace(); } catch(NoSuchMethodException e) { e.printStackTrace(); } } private static class PriSubClass { private int x; public int getX() { return x; } public void setX(int x) { this.x = x; } } protected static class ProSubClass { private int x; public int getX() { return x; } public void setX(int x) { this.x = x; } } public static class PubSubClass { private int x; public int getX() { return x; } public void setX(int x) { this.x = x; } } } class InsidePack { private int x; public int getX() { return x; } public void setX(int x) { this.x = x; } }