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[Java] Spring 3.0 /id.vs.name/简单属性的注入/bean中的scope属性/集合注入/自动装配/生命周期/

3, id vs. name
a), Spring_0400_IOC_Id_Name
b), name可以用特殊字符 beans.xml 中 <bean id/name="u" class="com.bjsxt.dao.impl.UserDAOImpl">
4, 简单属性的注入
a), Spring_0500_IOC_SimpleProperty
b), <property name=… value=….>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">

	<bean name="userDAO" class="com.bjsxt.dao.impl.UserDAOImpl">
		<property name="daoId" value="8"></property>
		<property name="daoStatus" value="good"></property>
		<!-- collaborators and configuration for this bean go here -->
	</bean>
	
	<bean id="userService" class="com.bjsxt.service.UserService">
		<!--   <property name="userDAO" ref="u"/>  -->
		<constructor-arg>
			<ref bean="userDAO"/>
		</constructor-arg>
	</bean>

	<!-- more bean definitions go here -->

</beans>

(因为是基础数据类型，其实我们自己写很少遇到这样的, 但Spring整合自己时，可以用到)
5, <bean 中的 scope 属性, 生命范围
a), Spring_0600_IOC_Bean_Scope
b), singleton 单例
c), proptotype 每次创建新的对象 <bean id="userService" class="com.bjsxt.service.UserService" scope="prototype">
6, 集合注入
a), Spring_0700_IOC_Collections (留下待定-现没有源码)

b), 很少用，不重要！参考程序

UserDAOImpl

package com.bjsxt.dao.impl;

import java.util.List;
import java.util.Map;
import java.util.Set;

import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;

public class UserDAOImpl implements UserDAO {
	/*
	 * (non-Javadoc)
	 * 
	 * @see com.bjsxt.dao.UserDAO#save(com.bjsxt.model.User)
	 */
	private Set<String> sets;
	private List<String> lists;
	private Map<String, String> maps;

	public Set<String> getSets() {
		return sets;
	}

	public void setSets(Set<String> sets) {
		this.sets = sets;
	}

	public List<String> getLists() {
		return lists;
	}

	public void setLists(List<String> lists) {
		this.lists = lists;
	}

	public Map<String, String> getMaps() {
		return maps;
	}

	public void setMaps(Map<String, String> maps) {
		this.maps = maps;
	}

	public UserDAOImpl() {
	}

	public void save(User user) {
		System.out.println("user saved!");
	}

	@Override
	public String toString() {
		return "sets size:" + sets.size() + "| lists size:" + lists.size()
				+ "| maps size:" + maps.size();
	}

}

beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

  <bean name="userDAO" class="com.bjsxt.dao.impl.UserDAOImpl">
  	<property name="sets"> <!--  setSets  -->
  		<set>
  			<value>1</value>
  			<value>2</value>
  		</set>
  	</property>
  	<property name="lists">
  		<list>
  			<value>1</value>
  			<value>2</value>
  			<value>3</value>
  		</list>
  	</property>
  	<property name="maps">
  		<map>
  			<entry key="1" value="1"></entry>
  			<entry key="2" value="2"></entry>
  			<entry key="3" value="3"></entry>
  			<entry key="4" value="4"></entry>
  		</map>
  	</property>
  </bean>

  <bean id="userService" class="com.bjsxt.service.UserService">
  <!-- 
  	<property name="userDAO">
  		<ref bean="userDAO"/>
  	</property>
  	 -->
  	 <constructor-arg>
  	 	<ref bean="userDAO"/>
  	 </constructor-arg>
  </bean>


</beans>

UserService

package com.bjsxt.service;

import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;

public class UserService {
	private UserDAO userDAO;
	
	private UserService(UserDAO userDAO) {
		this.userDAO = userDAO;
	}
	
	/*public UserDAO getUserDAO() {
		return userDAO;
	}
	public void setUserDAO(UserDAO userDAO) {
		System.out.println("set");
		this.userDAO = userDAO;
	}*/
	public void add(User user) {
		System.out.println(this.userDAO);
		this.userDAO.save(user);
	}
}

UserServiceTest

package com.bjsxt.service;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bjsxt.dao.UserDAO;

public class UserServiceTest {

	@Test
	public void testAdd() throws Exception {
		ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
		UserDAO u1 = (UserDAO)ctx.getBean("userDAO");
		System.out.println(u1);
	}
}

7, 自动装配
a), Spring_0800_IOC_AutoWire
b), byName
c), byType
d), 如果所有的bean都用同一种，可以使用 beans 的属性：default-autowire

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">
 
    <bean id="userDAO2" class="com.bjsxt.dao.impl.UserDAOImpl">
         <property name="daoId" value="2"></property>
    </bean>
<!-- 
    <bean id="userDAO2" class="com.bjsxt.dao.impl.UserDAOImpl">
        <property name="daoId" value="2"></property>
    </bean>autowire="byName"
-->
    <bean id="userService" class="com.bjsxt.service.UserService" scope="prototype" autowire="byType">
    </bean>

</beans>

package com.bjsxt.service;

import static org.junit.Assert.*;

import org.junit.Test;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;

public class UserServiceTest {

    @Test
    public void testAdd() throws Exception {

        ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");

        UserService service = (UserService) ctx.getBean("userService"); // new UserService();

        System.out.println(service.getUserDAO());
    }
}

8, 生命周期
a), Spring_0900_IOC_Life_Cycle
b), lazy-init (不重要) 我感觉不错。用到再实例化，不直接全初始化

c), init-method destroy-methd 不要和 prototype 一起用（了解）

beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">

	<bean name="u" class="com.bjsxt.dao.impl.UserDAOImpl">
	</bean>
	
	<bean id="userService" class="com.bjsxt.service.UserService" init-method="init" destroy-method="destroy">
		<!--   <property name="userDAO" ref="u"/>  -->
		<constructor-arg>
			<ref bean="u"/>
		</constructor-arg>
	</bean>
</beans>

UserService.java

package com.bjsxt.service;

import com.bjsxt.dao.UserDAO; // 抽象出的数据库管理层 
import com.bjsxt.dao.impl.UserDAOImpl;
import com.bjsxt.model.User;

public class UserService { // 业务逻辑， 还可以设计权限, 抽象出一层 ： 用户服务层, 用户管理层
    private UserDAO userDAO;

    public void  init() { /* service 初始化之前执行的方法  */
        System.out.println("init");
    }
    public UserDAO getUserDAO() {
        return userDAO;
    }

    public void setUserDAO(UserDAO userDAO) {
        this.userDAO = userDAO;
    }

    public void add(User u) {
        this.userDAO.save(u); // 添加用户会将用户添加到 DB 中。
    }

    public UserService(UserDAO userDAO) {
        super();
        this.userDAO = userDAO;
    }
    
    public void  destroy() { /* service 结束，容器关闭后执行的方法 */
        System.out.println("destroy");
    }

}

UserServiceTest.java

package com.bjsxt.service;

import static org.junit.Assert.*;

import org.junit.Test;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;

public class UserServiceTest {

    @Test
    public void testAdd() throws Exception {
        
        ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
        
        UserService service = (UserService) ctx.getBean("userService"); // new UserService();
        
        ctx.destroy();
    }
}

Spring 3.0 是 IOC 的容器。 IOC 小总结笔记

3, id vs. name
a), Spring_0400_IOC_Id_Name
b), name可以用特殊字符 <bean id/name="u" class="com.bjsxt.dao.impl.UserDAOImpl">
4, 简单属性的注入
a), Spring_0500_IOC_SimpleProperty
b), <property name=… value=….>
(因为是基础数据类型，其实我们自己写很少遇到这样的, 但Spring整合自己时，可以用到)
5, <bean 中的 scope 属性, 生命范围
a), Spring_0600_IOC_Bean_Scope
b), singleton 单例
c), proptotype 每次创建新的对象
6, 集合注入
a), Spring_0700_IOC_Collections
b), 很少用，不重要！参考程序
7, 自动装配
a), Spring_0800_IOC_AutoWire
b), byName
c), byType
d), 如果所有的bean都用同一种，可以使用 beans 的属性：default-autowire
8, 生命周期
a), Spring_0900_IOC_Life_Cycle
b), lazy-init (不重要) 我感觉不错。用到再实例化，不直接全初始化
c), init-method destroy-methd 不要和 prototype 一起用（了解）

3, id vs. name
    a), Spring_0400_IOC_Id_Name
    b), name可以用特殊字符  <bean id/name="u" class="com.bjsxt.dao.impl.UserDAOImpl">
4, 简单属性的注入
    a), Spring_0500_IOC_SimpleProperty
    b), <property name=… value=….> 
        (因为是基础数据类型，其实我们自己写很少遇到这样的, 但Spring整合自己时，可以用到)        
5, <bean 中的 scope 属性, 生命范围
    a), Spring_0600_IOC_Bean_Scope
    b), singleton 单例
    c), proptotype 每次创建新的对象
6, 集合注入
    a), Spring_0700_IOC_Collections
    b), 很少用，不重要！参考程序
7, 自动装配
   a), Spring_0800_IOC_AutoWire
   b), byName
   c), byType
   d), 如果所有的bean都用同一种，可以使用 beans 的属性：default-autowire
8, 生命周期
   a), Spring_0900_IOC_Life_Cycle
   b), lazy-init (不重要) 我感觉不错。用到再实例化，不直接全初始化
   c), init-method destroy-methd 不要和 prototype 一起用（了解）

Spring 3.0 是 IOC 的容器。 IOC 差不多讲解完了。重点是下面的AOP。

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原文地址：https://www.cnblogs.com/robbychan/p/3786831.html