spring实例化javabean的三种方式分享

<bean id="sayhello" class="test.service.impl.HelloBean"/>

package springdao;
public class personDao {
 private String name;
 private String dep;
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public String getDep() {
  return dep;
 }
 public void setDep(String dep) {
  this.dep = dep;
 }

 public void Test(){  
  System.out.println("hello,spring");
 }
}
springtest.java

 public static void main(String[] args) {
  // TODO Auto-generated method stub
  ApplicationContext ctx = new ClassPathXmlApplicationContext(new String[]{"beans.xml"});
  personDao pe=(personDao)ctx.getBean("persondao");//通过配置javabean    
 }

<bean id="productCreator" class="serviceImpl.productCreator" factory-method="createPersonDao"></bean>

package serviceImpl;
import springdao.personDao;
public class productCreator {
  public static personDao createPersonDao(){
   return new personDao();
  }

  public personDao productAcreate(){
   return new personDao();
  }
}
 

springtest.java

personDao pe=(personDao)ctx.getBean("productCreator");

pe.test();

<bean id="productCreator" class="serviceImpl.productCreator"/>
<bean id="productAcreate" factory-bean="productCreator" factory-method="productAcreate"/>

personDao pe=(personDao)ctx.getBean("productAcreate");//通过配置实例工厂方法来实例化bean文件
pe.test();