Spring中的属性命名的小问题有什么？
Spring中的属性命名的小问题有什么？
近日，用Spring做了一个很简单的小练习，从配置文件中产生一个对象，然后打印这个对象的内容。
发现在Spring中，属性命名的第2个字母必须小写，大写就出错，但第3,4,5…个字母大写都正常。不知是怎么回事？
代码如下：
文件MainClass
package cn.itcast;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
public class MainClass
{
public static void main(String[] args)
{
BeanFactory factory = new XmlBeanFactory(new ClassPathResource("/applicationContext.xml"));
Object student = factory.getBean("student");
System.out.printf( "%s /n",student );
}
}
文件Student.java
package cn.itcast;
public class Student
{
private String strName = null;
public String toString()
{
return "姓名：" + strName;
}
public String getStrName() {
return strName;
}
public void setStrName(String strName) {
this.strName = strName;
}
}
文件applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="student" class="cn.itcast.Student">
<property name="strName">
<value>唐老鸭</value>
</property>
</bean>
</beans>
运行是正常的，输出：
姓名：唐老鸭
但若将strName 的第2个字母改为大写sTrName，运行就出错了，不知是怎么回事？？？
文件Student.java
package cn.itcast;
public class Student
{
private String sTrName = null;
public String toString()
{
return "姓名：" + sTrName;
}
public String getSTrName() {
return sTrName;
}
public void setSTrName(String trName) {
sTrName = trName;
}
}
文件applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="student" class="cn.itcast.Student">
<property name="sTrName">
<value>唐老鸭</value>
</property>
</bean>
</beans>
错误信息：
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'student' defined in class path resource [applicationContext.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'sTrName' of bean class [cn.itcast.Student]: Bean property 'sTrName' is not writable or has an invalid setter method: Does the parameter type of the setter match the return type of the getter?
org.springframework.beans.NotWritablePropertyException: Invalid property 'sTrName' of bean class [cn.itcast.Student]: Bean property 'sTrName' is not writable or has an invalid setter method: Does the parameter type of the setter match the return type of the getter?
at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:567)
at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:469)
at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:626)
at org.springframework.beans.BeanWrapperImpl.setPropertyValues(BeanWrapperImpl.java:653)
at org.springframework.beans.BeanWrapperImpl.setPropertyValues(BeanWrapperImpl.java:642)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1027)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:824)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:345)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:226)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:147)
at cn.itcast.MainClass.main(MainClass.java:12)
在Eclipse和控制台下的运行结果都是一样。