spring bean三种创建方式
空参构造
<bean name="user" class="leitao.zhang.entities.User"></bean>
静态工厂
<bean name="staticuser" class="leitao.zhang.spring.UserFactory" factory-method="createUser"></bean>
public class UserFactory {
public static User createUser()
{
System.out.println("静态工厂");
return new User();
}
}
实例工厂
<bean name="UserFactory" class="leitao.zhang.spring.UserFactory"></bean>
<bean name="insuser" factory-bean="UserFactory" factory-method="createUser2"></bean>
public class UserFactory {
public User createUser2()
{
System.out.println("实例工厂");
return new User();
}
}
bean 之 scope
<bean name="user" class="leitao.zhang.entities.User" scope="singleton"></bean>
singleton 单利模式(默认) 容器中只会存在一个 绝大多数要用默认
prototype 多例 每次都new 整合struts2时要配置为改值 ActionContext 每次访问都要创建
request:web环境下，对象和request生命周期一直
session:web环境下，对像与session周期一样
bean之生命周期
<bean name="user" class="leitao.zhang.entities.User" init-method="init" destroy-method="destory"></bean>
init-method=”init”:配置一个方法作为生命周期的初始化方法，spring会在对象创建之后立即调用
destory-method=”destory” :配置一个方法作为生命周期销毁方法，spring容器会在关闭并销毁所有中期中的对象时调用
分模块配置
导入其它配置文件
<beans>
<import resource="leitao/zhang/entities/springBean.xml"/>
</beans>
spring属性注入
set方式注入
<bean name="order" class="leitao.zhang.entities.Order"> <!-- 值类型 --> <property name="id" value="d123456"></property> <property name="price" value="123"></property> <!-- 引用类型 --> <property name="user" ref="user"></property> </bean> <bean name="user" class="leitao.zhang.entities.User"> <property name="name" value="张三"></property> <property name="age" value="12"></property> </bean>
构造注入
index 指定参数索引位置
type 指定参数类型（完全限定类名）
value 值类型的值
ref引用类型bean
<bean name="order1" class="leitao.zhang.entities.Order"> <constructor-arg name="id" index="0" type="java.lang.String" value="d456987"></constructor-arg> <constructor-arg name="price" index="1" type="java.lang.Double" value="65423"></constructor-arg> <constructor-arg name="user" index="2" type="leitao.zhang.entities.User" ref="user"></constructor-arg> </bean>
p命名空间注入
在跟元素引入 命名空间 xmlns:p=”http://www.springframework.org/schema/p”
<bean name="order2" class="leitao.zhang.entities.Order" p:id="d65478" p:price="365.65" p:user-ref="user"></bean>
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns="http://www.springframework.org/schema/beans" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd " > <bean name="order" class="leitao.zhang.entities.Order"> <!-- 八大基本数据类型 --> <property name="id" value="d123456"></property> <property name="price" value="123"></property> <!-- 引用类型 --> <property name="user" ref="user"></property> </bean> <bean name="user" class="leitao.zhang.entities.User"> <property name="name" value="张三"></property> <property name="age" value="12"></property> </bean> <bean name="order1" class="leitao.zhang.entities.Order"> <constructor-arg name="id" index="0" type="java.lang.String" value="d456987"></constructor-arg> <constructor-arg name="price" index="1" type="java.lang.Double" value="65423"></constructor-arg> <constructor-arg name="user" index="2" type="leitao.zhang.entities.User" ref="user"></constructor-arg> </bean> <bean name="order2" class="leitao.zhang.entities.Order" p:id="d65478" p:price="365.65" p:user-ref="user"></bean> </beans>
spel注入 spring express language
格式：#{beanName.beanProperty}
<bean name="order3" class="leitao.zhang.entities.Order">
<property name="id" value="#{order.id}"></property>
<property name="price" value="456"></property>
<!-- 引用类型 -->
<property name="user" ref="user"></property>
</bean>
属性复杂类型注入
bean:
package leitao.zhang.entities;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
public class CollectionBean {
private Object[] arr;
private Object[] arr2;
private List list;
private Map map;
private Set set;
private Properties properties;
public CollectionBean() {
super();
}
public Object[] getArr() {
return arr;
}
public void setArr(Object[] arr) {
this.arr = arr;
}
public Object[] getArr2() {
return arr2;
}
public void setArr2(Object[] arr2) {
this.arr2 = arr2;
}
public Set getSet() {
return set;
}
public void setSet(Set set) {
this.set = set;
}
public List getList() {
return list;
}
public void setList(List list) {
this.list = list;
}
public Map getMap() {
return map;
}
public void setMap(Map map) {
this.map = map;
}
public Properties getProperties() {
return properties;
}
public void setProperties(Properties properties) {
this.properties = properties;
}
@Override
public String toString() {
return "CollectionBean [arr=" + Arrays.toString(arr) + ", arr2=" + Arrays.toString(arr2) + ", list=" + list
+ ", map=" + map + ", set=" + set + ", properties=" + properties + "]";
}
}
xml:
<bean name="cb" class="leitao.zhang.entities.CollectionBean">
<!-- 数组只有一个值 -->
<property name="arr" value="4568"></property>
<!-- 数组多个值 -->
<property name="arr2">
<array>
<value>6589</value>
<value>#{order2}</value>
<ref bean="order3"/>
</array>
</property>
<!-- list和数组一样 -->
<property name="list">
<list>
<value>6584</value>
<ref bean="user"/>
<value>#{user.name}</value>
</list>
</property>
<!-- map -->
<property name="map">
<map>
<entry key="#{user.name}" value="战斗"></entry>
<entry key="ade" value-ref="order"></entry>
<entry key-ref="user" value-ref="order"></entry>
</map>
</property>
<property name="set">
<set>
<value>#{order}</value>
<value>#{user.name}</value>
<ref bean="order1"/>
<array>
<value>98</value>
</array>
</set>
</property>
<!-- Properties -->
<property name="properties">
<props>
<prop key="driverClass">com.jdbc.mysql.Driver</prop>
<prop key="userName">root</prop>
<prop key="password">root</prop>
</props>
</property>
</bean>
java:
package leitao.zhang.spring;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import leitao.zhang.entities.CollectionBean;
import leitao.zhang.entities.Order;
import leitao.zhang.entities.User;
public class Demo1 {
// /**
// * bean entitis 空参构造
// */
// @Test
// public void fun1()
// {
//
// ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
// User bean = (User) ac.getBean("user");
// System.out.println(bean);
// }
// /**
// * 静态工厂
// */
// @Test
// public void fun2()
// {
// ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
// User bean = (User) ac.getBean("staticuser");
// System.out.println(bean);
//
// }
// /**
// * 实例工厂
// */
// @Test
// public void fun3()
// {
// ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
// User bean = (User) ac.getBean("insuser");
// System.out.println(bean);
//
// }
//
//
//
// /**
// * 生命周期==初始化销毁方法
// */
// @Test
// public void fun4()
// {
// ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
// User bean = (User) ac.getBean("user");
// ac.close();
// System.out.println(bean);
//
// }
/**
* set注入
*/
@Test
public void fun5()
{
ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
Order bean = (Order) ac.getBean("order");
ac.close();
System.out.println(bean);
}
/**
* 构造注入
*/
@Test
public void fun6()
{
ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
Order bean = (Order) ac.getBean("order1");
ac.close();
System.out.println(bean);
}
/**
* p命名空间注入
*/
@Test
public void fun7()
{
ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
Order bean = (Order) ac.getBean("order2");
ac.close();
System.out.println(bean);
}
/**
* spel spring expresess language 注入
*/
@Test
public void fun8()
{
ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
Order bean = (Order) ac.getBean("order3");
ac.close();
System.out.println(bean);
}
/**
* 属性复杂类型注入
*/
@Test
public void fun9()
{
ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
CollectionBean bean = (CollectionBean) ac.getBean("cb");
ac.close();
System.out.println(bean);
}
}
Spring,struts2整合到web
<listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
在 struts2 Action中获取ApplicationContext对象
WebApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(ServletActionContext.getServletContext());
Order bean = (Order) context.getBean("order1");
ActionContext.getContext().put("order", bean);
未经允许不得转载：开心乐窝-乐在其中 » spring 对象创建 bean
