Spring学习-创建Bean的三种方式

MyTestInstance类

package com.app.impl;

public class MyTestInstance {

  private String testMessage;

  public MyTestInstance(){
    System.out.println("初始化我的MyTestInstance类.");
  }
  public void info(){
    System.out.println(this.getTestMessage());
  }

  public String getTestMessage() {
    return testMessage;
  }

  public void setTestMessage(String testMessage) {
    this.testMessage = testMessage;
  }


}

TestCreateInstance 类

package com.app.impl;

import com.app.ICreateInstance;

public class TestCreateInstance implements ICreateInstance {

  private String message;

  public TestCreateInstance(){
    System.out.println("使用构造器创建Bean实例");
  }
  public static MyTestInstance staticCreateInstance(){
    MyTestInstance instance = new MyTestInstance();
    System.out.println("使用静态工厂方法创建Bean");
    return instance;
  }
  public MyTestInstance createInstance(){
    MyTestInstance instance = new MyTestInstance();
    System.out.println("调用实例工厂方法创建Bean");
    return instance;
  }

  public void testService() {
    System.out.println("testService--------------");
  }

  public void setMessage(String message) {
    this.message = message;
  }
  public String getMessage() {
    return message;
  }




}

Hibernate.cfg.xml配置

<bean id="testCreateInstance1" class="com.app.impl.TestCreateInstance" p:message="我的哈哈">
  </bean> 
  <bean id="testCreateInstance2" class="com.app.impl.TestCreateInstance" 
    p:testMessage="不是哈哈1"
    factory-method="staticCreateInstance">
  </bean>
  <bean id="testCreateInstance3" factory-bean="testCreateInstance1"
    p:testMessage="不是哈哈2"
    factory-method="createInstance">
  </bean>

测试

public void testCreate(){
    ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");

    TestCreateInstance instance1 = ctx.getBean("testCreateInstance1",TestCreateInstance.class);
    instance1.testService();

    MyTestInstance instance2 = ctx.getBean("testCreateInstance2",MyTestInstance.class);
    instance2.info();

    MyTestInstance instance3 = ctx.getBean("testCreateInstance3",MyTestInstance.class);
    instance3.info();
  }

、

输出:

---------------------------------------------------

使用构造器创建Bean实例

初始化我的MyTestInstance类.

使用静态工厂方法创建Bean

初始化我的MyTestInstance类.

调用实例工厂方法创建Bean

testService--------------

不是哈哈1

不是哈哈2