spring IOC 建立bean的三種方式

使用預設建構函式建立（預設建構函式建立bean物件，如果沒有建構函式，則物件無法建立）

package com.ay.service;

public
inte***ce
accountservice

package com.ay.service.impl;

import com.ay.service.accountservice;
public
class
accountserviceimpl
implements
accountservice
public
accountserviceimpl()
}

<

?xml version=
"1.0" encoding=
"utf-8"
?>
""xmlns:xsi=
""xsi:schemalocation=
" /spring-beans.xsd"
>
"accountservice"
class
="com.ay.service.impl.accountserviceimpl"
>
<
/bean>
<
/beans>

package com.ay.ui;

import com.ay.service.accountservice;
public
class
client
}

package com.ay.service;

public
inte***ce
accountservice

<

?xml version=
"1.0" encoding=
"utf-8"
?>
""xmlns:xsi=
""xsi:schemalocation=
" /spring-beans.xsd"
>
"instancefactory"
class
="com.ay.factory.instancefactory"
>
<
/bean>
"accountservice" factory-bean=
"instancefactory" factory-method=
"getaccountservice"
>
<
/bean>
<
/beans>

package com.ay.factory;

import com.ay.service.accountservice;
import com.ay.service.impl.accountserviceimpl;
public
class
instancefactory
}

package com.ay.service.impl;

import com.ay.service.accountservice;
public
class
accountserviceimpl
implements
accountservice
public
accountserviceimpl()
}

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