1. import org.apache.commons.beanutils.BeanUtils;
   
2. 
   
3. public class BeanUtilsDemo1
   
4. {
   
5. public static void main(String[] args) throws Exception
   
6. {
   
7. Person p1 = new Person("Ansen", 24);
   
8. BeanUtils.setProperty(p1,"age","23");
   
9. }
   
10. 
    
11. }
    
12. 
    
13. class Person
    
14. {
    
15. private String name ;
    
16. private int age;
    
17. 
    
18. public Person(String name , int age)
    
19. {
    
20. this.name = name ;
    
21. this.age = age;
    
22. }
    
23. public String getName()
    
24. {
    
25. return name;
    
26. }
    
27. public void setName(String name)
    
28. {
    
29. this.name = name;
    
30. }
    
31. public int getAge()
    
32. {
    
33. return age;
    
34. }
    
35. public void setAge(int age)
    
36. {
    
37. this.age = age;
    
38. }
    
39. 
    
40. }

复制代码

Exception in thread "main" java.lang.reflect.InvocationTargetException: Cannot set age
at org.apache.commons.beanutils.BeanUtilsBean.setProperty(BeanUtilsBean.java:1019)
at org.apache.commons.beanutils.BeanUtils.setProperty(BeanUtils.java:456)
at com.JavaBean.BeanUtilsDemo1.main(BeanUtilsDemo1.java:11)
Caused by: java.lang.NoSuchMethodException: Property 'age' has no setter method in class 'class com.JavaBean.Person'
at org.apache.commons.beanutils.PropertyUtilsBean.setSimpleProperty(PropertyUtilsBean.java:2138)
at org.apache.commons.beanutils.PropertyUtilsBean.setNestedProperty(PropertyUtilsBean.java:1957)
at org.apache.commons.beanutils.PropertyUtilsBean.setProperty(PropertyUtilsBean.java:2064)
at org.apache.commons.beanutils.BeanUtilsBean.setProperty(BeanUtilsBean.java:1017)
... 2 more
以上想set age属性，却抱错了，实在搞不懂哪里错了？

接下来试试get 属性的值，发现还是抱错，抱错信息如下，请大侠帮忙分析一下。。
Exception in thread "main" java.lang.NoSuchMethodException: Property 'name' has no getter method in class 'class com.JavaBean.Person'
at org.apache.commons.beanutils.PropertyUtilsBean.getSimpleProperty(PropertyUtilsBean.java:1327)
at org.apache.commons.beanutils.PropertyUtilsBean.getNestedProperty(PropertyUtilsBean.java:770)
at org.apache.commons.beanutils.BeanUtilsBean.getNestedProperty(BeanUtilsBean.java:715)
at org.apache.commons.beanutils.BeanUtilsBean.getProperty(BeanUtilsBean.java:741)
at org.apache.commons.beanutils.BeanUtils.getProperty(BeanUtils.java:382)
at com.JavaBean.BeanUtilsDemo1.main(BeanUtilsDemo1.java:10)


我使用BeanUtils的Jar包为:commons-beanutils-1.8.3.jar，今天从网上download的
日志jar为:commons-logging-1.1.3.jar

Class Perosn类 改为“public class Person”，你需要给Peron类加上修饰符就没问题了，少年，再运行试试..

lonely_zb 发表于 2013-9-6 02:05
Class Perosn类 改为“public class Person”，你需要给Peron类加上修饰符就没问题了，少年，再运行试试.. ...

改为Public 可以了，可是为什么会是这样呢？操作JavaBean一定要写成public吗？