1. package sheng.java.language;
   
2. 
   
3. class Person {
   
4.         private String name;
   
5.         private int age;
   
6. 
   
7.         public String getName() {
   
8.                 return name;
   
9.         }
   
10. 
    
11.         public void setName(String name) {
    
12.                 this.name = name;
    
13.         }
    
14. 
    
15.         public int getAge() {
    
16.                 return age;
    
17.         }
    
18. 
    
19.         public void setAge(int age) {
    
20.                 this.age = age;
    
21.         }
    
22. 
    
23.         public Person(String name, int age) {
    
24.                 super();
    
25.                 this.name = name;
    
26.                 this.age = age;
    
27.         }
    
28. 
    
29.         public Person() {
    
30.                 // TODO Auto-generated constructor stub
    
31.         }
    
32. 
    
33. }

复制代码

1. package sheng.java.language;
   
2. 
   
3. import java.lang.reflect.InvocationTargetException;
   
4. 
   
5. import org.apache.commons.beanutils.BeanUtils;
   
6. 
   
7. public class BeanUtilsDemo {
   
8. 
   
9.         /**
   
10.          * @param args
    
11.          * @throws NoSuchMethodException
    
12.          * @throws InvocationTargetException
    
13.          * @throws IllegalAccessException
    
14.          */
    
15.         public static void main(String[] args) throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
    
16.                 // TODO Auto-generated method stub
    
17.                 Person p = new Person("zhansan", 23);
    
18.                 String name = "age";
    
19.                
    
20.                 System.out.println(BeanUtils.getProperty(p, name));
    
21. 
    
22.         }
    
23. 
    
24. }
    

复制代码

Exception in thread "main" java.lang.NoSuchMethodException: Property 'age' has no getter method in class 'class sheng.java.language.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 sheng.java.language.BeanUtilsDemo.main(BeanUtilsDemo.java:20)


查明原因后发现Person类必须是public.

1. package sheng.java.language;
   
2. 
   
3. class Person {
   
4.         private String name;
   
5.         private int age;
   
6. 
   
7.         public String getName() {
   
8.                 return name;
   
9.         }
   
10. 
    
11.         public void setName(String name) {
    
12.                 this.name = name;
    
13.         }
    
14. 
    
15.         public int getAge() {
    
16.                 return age;
    
17.         }
    
18. 
    
19.         public void setAge(int age) {
    
20.                 this.age = age;
    
21.         }
    
22. 
    
23.         public Person(String name, int age) {
    
24.                 super();
    
25.                 this.name = name;
    
26.                 this.age = age;
    
27.         }
    
28. 
    
29.         public Person() {
    
30.                 // TODO Auto-generated constructor stub
    
31.         }
    
32. 
    
33. }

复制代码

1. package sheng.java.language;
   
2. 
   
3. import java.lang.reflect.InvocationTargetException;
   
4. 
   
5. import org.apache.commons.beanutils.BeanUtils;
   
6. 
   
7. public class BeanUtilsDemo {
   
8. 
   
9.         /**
   
10.          * @param args
    
11.          * @throws NoSuchMethodException
    
12.          * @throws InvocationTargetException
    
13.          * @throws IllegalAccessException
    
14.          */
    
15.         public static void main(String[] args) throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
    
16.                 // TODO Auto-generated method stub
    
17.                 Person p = new Person("zhansan", 23);
    
18.                 String name = "age";
    
19.                
    
20.                 System.out.println(BeanUtils.getProperty(p, name));
    
21. 
    
22.         }
    
23. 
    
24. }
    

复制代码

Exception in thread "main" java.lang.NoSuchMethodException: Property 'age' has no getter method in class 'class sheng.java.language.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 sheng.java.language.BeanUtilsDemo.main(BeanUtilsDemo.java:20)


查明原因后发现Person类必须是public.