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();