我是Spring的新手。我有下面的Person bean,名称,地址和年龄作为属性。现在我想在我的自定义BeanFactoryPostProcessor中向Person bean添加一个名为gender的新属性。我的人bean实现了AttributeAccessor。
XML配置文件
<bean id="PersonBean" class="com.mkyong.common.Person">
<property name="name" value="mkyong"></property>
<property name="address" value="address ABC"></property>
<property name="age" value="29"></property>
</bean>
<bean class="com.mkyong.common.CustomBeanFactory"></bean>
自定义BeanFactoryPostProcessor
public class CustomBeanFactory implements BeanFactoryPostProcessor {
@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory arg0) throws BeansException {
BeanDefinition beanDefinition = arg0.getBeanDefinition("PersonBean");
beanDefinition.setAttribute("gender", "Male");
}
}
人员班
enter code here
public class Person implements AttributeAccessor{
private String name;
private String address;
private int age;
public Person(){
System.out.println("Creating bean Person "+this);
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String[] attributeNames() {
// TODO Auto-generated method stub
return null;
}
@Override
public Object getAttribute(String arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public boolean hasAttribute(String arg0) {
// TODO Auto-generated method stub
return false;
}
@Override
public Object removeAttribute(String arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public void setAttribute(String arg0, Object arg1) {
// TODO Auto-generated method stub
}
}
客户端程序
public static void main(String [] arg){
ApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"Spring-Autoscan.xml"});
Person personObj = (Person)context.getBean("PersonBean");
System.out.println("Value of gender attribute "+personObj.getAttribute("gender"));
}
如果我访问性别,我将无效
请让我知道如何动态设置和获取属性。
答案 0 :(得分:0)
您的setAttribute()方法为空。它不存储值。
public void setAttribute(String arg0, Object arg1) {
// TODO Auto-generated method stub
}
在里面创建一个Map
,您可以在其中存储值并将其取回。喜欢这个
private Map<String, Object> map = new HashMap<>();
public void setAttribute(String arg0, Object arg1) {
map.put(arg0, arg1);
}
public Object getAttribute(String arg0) {
return map.get(arg0);
}