Spring 6.0官方文档示例（23): singleton类型的bean和prototype类型的bean协同工作的方法（二）

使用lookup-method:
一、实体类：

package cn.edu.tju.domain2;import java.time.LocalDateTime;
import java.util.Map;public class Command {private Map<String, Object> state;public Map<String, Object> getState() {return state;}public void setState(Map<String, Object> state) {this.state = state;}public Object execute(){System.out.println(LocalDateTime.now().toLocalTime());return null;}}

package cn.edu.tju.domain2;import java.util.HashMap;public abstract class CommandManager {public Object process(Object commandState) {// grab a new instance of the appropriate Command interfaceCommand command = createCommand();System.out.println("hash: " + command.hashCode());// set the state on the (hopefully brand new) Command instancecommand.setState(new HashMap<String, Object>());return command.execute();}// okay... but where is the implementation of this method?protected abstract Command createCommand();}

二、配置文件：

<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsd"><bean class="cn.edu.tju.domain2.CommandManager" id="commandManager"  ><lookup-method bean="command" name="createCommand"/></bean><bean class="cn.edu.tju.domain2.Command" id="command" scope="prototype" ></bean></beans>

三、主类：

package cn.edu.tju;import cn.edu.tju.domain2.CommandManager;
import org.springframework.context.support.ClassPathXmlApplicationContext;import java.util.HashMap;public class TestDiffScope2 {public static void main(String[] args) {ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("test8.xml","test2.xml");CommandManager commandManager = context.getBean("commandManager", CommandManager.class);commandManager.process(new HashMap<String, Object>());CommandManager commandManager2 = context.getBean("commandManager", CommandManager.class);commandManager2.process(new HashMap<>());}
}