String框架搭建的基本步骤,及从 IOC & DI 容器中获取 Bean(spring框架bean的配置)--有实现数据库连接池的链接
Spring框架的插件springsource-tool-suite-3.4.0.RELEASE-e4.3.1-updatesite(是一个压缩包)导入步骤:
eclipse->help->Instal New Software->点击add,找到该压缩包->选择 Name下面选择带有 /Spring IDC 的多选框->取消最下边的选框 contact all...->next...->finish;
建立一个java project,在工程目录下(day-1)建立Folder的lib文件夹,放入Spring的五个jar架包放在里面,并且解压:
commons-logging-1.1.1.jar
spring-beans-4.0.0.RELEASE.jar
spring-context-4.0.0.RELEASE.jar
spring-core-4.0.0.RELEASE.jar
spring-expression-4.0.0.RELEASE.jar
上述步骤完毕后,就建立Spring的配置文件,一个典型的Spring项目,需要建立一个或多个bean的配置文件,建立Spring配置文件的步骤如下:
该工程下的src->other->spring->Spring Bean Configuration File;该文件的后缀为.xml;然后就建立包,java类...
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以下是在Spring的IOC容器中配置Bean,ApplicationContext 是面向使用 Spring 框架的开发者,几乎所有的应用场合都直接使用ApplicationContext;
ApplicationContext 的主要实现类,ClassPathXmlApplicationContext:从 类路径下加载配置文件;ApplicationContext 在初始化上下文时就实例化所有单例的 Bean。
Spring的命名空间的使用(在该配置文件中,类似于标签)如下:
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1.applicationContext.xml的配置文件:基本命名空间bean的使用 及 含有特殊标签<>的使用<![CDATA[<pnapan^-^>]]>
<bean id="helloWorld" class="com.atguigu.spring.beans.Hello"> <property name="name" value="spring"></property> </bean> <bean id="car" class="com.atguigu.spring.beans.Car">
//此处<constructor-arg value=" "后可添加 类型和索引 type="double" 或 index=”2“> <constructor-arg value="4234534.21"></constructor-arg> <constructor-arg value="red"></constructor-arg> <constructor-arg value="baoma"></constructor-arg> </bean> <bean id="person" class="com.atguigu.spring.beans.Person"> <property name="name"> <value><![CDATA[<pnapan^-^>]]></value> </property> <property name="age" value="24"></property> <property name="car" ref="car"></property>
</bean>
src 目录下的bean方法主要是set方法,有Person类,Car类,Hello类他们都雷同,写一个就行了;
package com.atguigu.spring.beans; public class Car { private double price; private String color; private String name; public Car(double price, String color, String name) { super(); this.price = price; this.color = color; this.name = name; } @Override public String toString() { return "Car [price=" + price + ", color=" + color + ", name=" + name + "]"; } }
在src目录下建立的main方法
package com.atguigu.spring.beans; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Main { public static void main(String[] args) { ApplicationContext cxt=new ClassPathXmlApplicationContext("applicationContext.xml"); Hello hello=(Hello) cxt.getBean("helloWorld"); hello.hello(); Car car=(Car) cxt.getBean("car"); System.out.println(car); Person person=(Person) cxt.getBean("person"); System.out.println(person); } }
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2.在配置文件中插入list和map集合,utli和 p 命名空间的使用,util适用于list集合,p简化代码;
其中person类中private list<Car> car; car属性是list集合泛型是Car;
person2类中private Map<Strng , Car> car;
DataSource类中只有private Properties properties;属性为文件类型,再设置get,set ,toStrong这类bean方法
<bean id="car" class="com.atguigu.spring.beans2.Car"> <property name="name" value="changan"></property> <property name="color" value="red"></property> <property name="price" value="2312321"></property> </bean> <bean id="car2" class="com.atguigu.spring.beans2.Car"> <property name="name" value="baoma"></property> <property name="color" value="green"></property> <property name="price" value="890"></property> </bean> <bean id="person" class="com.atguigu.spring.beans2.Person"> <property name="name" value="panpan"></property> <property name="age" value="21"></property> <property name="car"> <list> <ref bean="car"/> <ref bean="car2"/> </list> </property> </bean> <bean id="person2" class="com.atguigu.spring.beans2.Person"> <property name="name" value="jiajia"></property> <property name="age" value="22"></property> <property name="car"> <map> <entry key="AAA" value-ref="car"></entry> <entry key="BBB" value-ref="car2"></entry> </map> </property> </bean> <bean id="properties" class="com.atguigu.spring.beans2.DataSource"> <property name="properties"> <props> <prop key="username">oraclejava</prop> <prop key="password">lxn123</prop> <prop key="jdbcUrl">oracle</prop> <prop key="driverClass">drivaer</prop> </props> </property> </bean> <util:list id="cars"> <ref bean="car"/> <ref bean="car2"/> </util:list> <bean id="person3" class="com.atguigu.spring.beans2.Person"> <property name="name" value="panpan"></property> <property name="age" value="12"></property> <property name="car"> <ref bean="cars"/> </property> </bean> <bean id="person4" class="com.atguigu.spring.beans2.Person" p:name="quanquan" p:age="23" p:car-ref="cars">
</bean>
Main类中的测试方法:
ApplicationContext app=new ClassPathXmlApplicationContext("applicationContext2.xml");
Person person=(Person) app.getBean("person");
System.out.println(person);
// Person person2=(Person) app.getBean("person2");
// System.out.println(person2);
DataSource dataSource=app.getBean(DataSource.class);
System.out.println(dataSource);
person=(Person) app.getBean("person3");
System.out.println(person);
person=(Person) app.getBean("person4");
System.out.println(person);
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bean的自动装配:使用时必须保证全类名下的i d名和 type具有唯一性;
通过类型:autowire="byType";
通过id名:autowire="byName"
<bean id="person" class="com.atguigu.spring.beans3.Person"
p:name="panpan" p:car-ref="car" p:address-ref="address">
</bean>
<bean id="person2" class="com.atguigu.spring.beans3.Person"
p:name="jiajia" autowire="byName">
</bean>
<bean id="person3" class="com.atguigu.spring.beans3.Person"
p:name="sjkdls" autowire="byType">
</bean>
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bean之间的关系:依赖和继承
继承:父类:abstract 必须设为 true,子类:有parent=”“;
依赖:通过depends-on 属性设定....
<bean id="address"
p:city="nanjing" p:street="jianjian" abstract="true">
</bean>
<bean id="address2" class="com.atguigu.spring.beans3.Address"
p:street="panpan" parent="address" >
</bean>
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通过bean的配置读取文件中数据,实现c3p0数据库连接池的链接
src目录下建立file文件jdbc.properties
user=root password=lxn123 driverclass=com.mysql.jdbc.Driver jdbcurl=jdbc:mysql:///test
spring 的bean文件applicationContext4.xml中进行配置;这里使用到了context命名空间
<!-- 使用外部的配置文件 --> <context:property-placeholder location="classpath:jdbc.properties"/> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="user" value="${user}"></property> <property name="password" value="${password}"></property> <property name="driverClass" value="${driverclass}"></property> <property name="jdbcUrl" value="${jdbcurl}"></property>
</bean>
Main类中测试:
ApplicationContext cx=new ClassPathXmlApplicationContext("applicationContext4.xml"); DataSource dataSource=(DataSource) cx.getBean("dataSource"); System.out.println(dataSource.getConnection());