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Spring核心思想：
IOC: Inversion Of Control (控制反转) / DI: Dependency Injection (依赖注入)
AOP: Aspect Oriented Programming (面向切面编程)
Model
package com.wangj.spring.model;
public class User {
private String username;
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
Dao
package com.wangj.spring.dao; import com.wangj.spring.model.User; public interface UserDao { void save(User user); }
DaoImpl
package com.wangj.spring.dao.impl; import com.wangj.spring.dao.UserDao; import com.wangj.spring.model.User; public class UserDaoImpl implements UserDao { @Override public void save(User user) { System.out.println(String.format("user(%s) saved!", user.getUsername())); } }
Service
package com.wangj.spring.service; import com.wangj.spring.dao.UserDao; import com.wangj.spring.model.User; public class UserService { private UserDao userDao; public void add(User user) { userDao.save(user); } public UserDao getUserDao() { return userDao; } public void setUserDao(UserDao userDao) { this.userDao = userDao; } }
jar
applicationContext.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" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd"> <bean id="userDao" class="com.wangj.spring.dao.impl.UserDaoImpl"> </bean> <bean id="userService" class="com.wangj.spring.service.UserService"> <property name="userDao" ref="userDao"></property> </bean> </beans>
test
package com.wangj.spring; import org.springframework.context.ApplicationContext; import org.springframework.context.support.FileSystemXmlApplicationContext; import com.wangj.spring.model.User; import com.wangj.spring.service.UserService; public class SpringDemo { public static void main(String[] args) { ApplicationContext applicationContext = new FileSystemXmlApplicationContext("config/applicationContext.xml"); UserService service = (UserService) applicationContext.getBean("userService"); User user = new User(); user.setUsername("wangj"); user.setPassword("wangj1130"); service.add(user); } }
1. set方法注入
<bean id="userService" class="com.wangj.spring.service.UserService">
<property name="userDao" ref="userDao"></property>
</bean>
2. 构造方法注入
<bean id="userService" class="com.wangj.spring.service.UserService">
<constructor-arg>
<ref bean="userDao"/>
<!-- <bean class="com.wangj.test.spring.dao.impl.UserDaoImpl"/> --> <!-- 重新new对象 -->
</constructor-arg>
</bean>
当构造方法里含有多个参数时：
1）根据类型
<bean id="exampleBean" class="examples.ExampleBean">
<constructor-arg type="int" value="7500000"/>
<constructor-arg type="java.lang.String" value="42"/>
</bean>
2）根据顺序
<bean id="exampleBean" class="examples.ExampleBean">
<constructor-arg index="0" value="7500000"/>
<constructor-arg index="1" value="42"/>
</bean>
scope="singleton" //(默认)每次使用同一个对象
="prototype" //每次都new一个新的（Struts Action）
=request、session、global session（不重要）
<bean name="userDAO" class="com.wangj.dao.impl.UserDAOImpl">
<property name="sets">
<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>
autowire="byName" // 根据名称自动装配，该名称为setXxx()方法中xxx(set后的字符串首字母小写)，与变量名无关
="byType" // 根据类型自动装配
="default" // 跟<beans 节点中 default-autowire属性一致，如果<beans节点中未配置default-autowire属性，则报异常
lazy-init="true" // 什么时用到什么时候初始化（sping初始化默认将所有bean加载到内存）
init-method="init" // 容器初始化时调用
destroy-method="destroy" // 容器销毁时调用
(init-method、destroy-method 一般不和prototype一起用)
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原文地址：http://www.cnblogs.com/wangj1130/p/4899392.html
