spring5（介绍spring5和基于xml的IOC管理bean开发）

public class Book {  
//创建属性 
 private String bname;  
private String bauthor; 
 //创建属性对应的set方法 
 public void setBname(String bname)
 {  this.bname = bname;  } 
 public void setBauthor(String bauthor)
 {  this.bauthor = bauthor;  } 
} 

<bean id="book" class="com.atguigu.spring5.Book">  
<!--使用property完成属性注入  name：类里面属性名称  value：向属性注入的值  --> 
 <property name="bname" value="易筋经"></property> 
 <property name="bauthor" value="达摩老祖"></property> 
</bean> 

public class Orders {  
//属性  
private String oname;
private String address;  
//有参数构造  
public Orders(String oname,String address)
 {  this.oname = oname;
  this.address = address;
  } 
} 

<bean id="orders" class="com.atguigu.spring5.Orders">
  <constructor-arg name="oname" value="电脑"></constructor-arg>
  <constructor-arg name="address" value="China"></constructor-arg> 
</bean> 

<bean id="book" class="com.atguigu.spring5.Book"
 p:bname="九阳神功" p:bauthor="无名氏"></bean> 

public class UserService { 
 //创建UserDao类型属性，生成set方法  
private UserDao userDao;  
public void setUserDao(UserDao userDao)
 {  this.userDao = userDao;  } 
 public void add() 
{  System.out.println("service add..............."); 
 userDao.update();  } } 

//部门类 
public class Dept 
{  private String dname; 
 public void setDname(String dname)
 {  this.dname = dname;  } 
} 
//员工类 public class Emp
 {  private String ename; 
 private String gender; 
 //员工属于某一个部门，使用对象形式表示 
 private Dept dept;  
public void setDept(Dept dept)
 {  this.dept = dept;  }  
public void setEname(String ename)
 {  this.ename = ename;  } 
 public void setGender(String gender)
 {  this.gender = gender;  }
 } 

<!--级联赋值-->
 <bean id="emp" class="com.atguigu.spring5.bean.Emp">
  <!--设置两个普通属性--> 
 <property name="ename" value="lucy"></property> 
   <property name="gender" value="女"></property>  
<!--级联赋值-->  <property name="dept" ref="dept"></property>  
<property name="dept.dname" value="技术部"></property>
 </bean>

public class MyBean implements FactoryBean<Course> 
{  //定义返回bean
  @Override
  public Course getObject() throws Exception
 {  Course course = new Course(); 
 course.setCname("abc");  
return course;  } 
 @Override 
 public Class<?> getObjectType()
 {  return null;  } 
 @Override  
public boolean isSingleton() 
{  return false;  } } 

<bean id="myBean" class="com.atguigu.spring5.factorybean.MyBean"> </bean> 

@Test public void test3() {  
ApplicationContext context =  
             new ClassPathXmlApplicationContext("bean3.xml"); 
 Course course = context.getBean("myBean", Course.class);  
System.out.println(course); } 

public class Orders {    
//无参数构造
  public Orders() 
{  System.out.println("第一步 执行无参数构造创建bean实例");  } 
 private String oname; 
 public void setOname(String oname)
 {  this.oname = oname;  System.out.println("第二步 调用set方法设置属性值");  }
  //创建执行的初始化的方法
  public void initMethod()
 {  System.out.println("第三步 执行初始化的方法");  }  
//创建执行的销毁的方法  
public void destroyMethod() 
{  System.out.println("第五步 执行销毁的方法");  }
 } 

<bean id="orders" class="com.atguigu.spring5.bean.Orders" 
initmethod="initMethod" destroy-method="destroyMethod">  
<property name="oname" value="手机"></property>
 </bean> 

@Test  public void testBean3() { 

 ClassPathXmlApplicationContext context = 
          new ClassPathXmlApplicationContext("bean4.xml"); 
 Orders orders = context.getBean("orders", Orders.class); 
 System.out.println("第四步 获取创建bean实例对象");
  System.out.println(orders); 
 //手动让bean实例销毁 
 context.close(); 
 } 

<!--配置后置处理器--> 
<bean id="myBeanPost" class="com.atguigu.spring5.bean.MyBeanPost">
</bean> 

<!--实现自动装配  bean标签属性autowire，配置自动装配 
 autowire属性常用两个值：  byName根据属性名称注入 ，
注入值bean的id值和类属性名称一样 
 byType根据属性类型注入 --> 
<bean id="emp" class="com.atguigu.spring5.autowire.Emp" autowire="byName"> 
 <!--<property name="dept" ref="dept"></property>--> 
</bean> 
<bean id="dept" class="com.atguigu.spring5.autowire.Dept">
</bean> 

<!--实现自动装配  bean标签属性autowire，
配置自动装配  autowire属性常用两个值：  byName根据属性名称注入 ，
注入值bean的id值和类属性名称一样 
 byType根据属性类型注入 --> 
<bean id="emp" class="com.atguigu.spring5.autowire.Emp" autowire="byType"> 
 <!--<property name="dept" ref="dept"></property>--> 
</bean> 
<bean id="dept" class="com.atguigu.spring5.autowire.Dept">
</bean> 

<!--直接配置连接池-->
 <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
  <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>  
<property name="url" value="jdbc:mysql://localhost:3306/userDb"></property> 
 <property name="username" value="root"></property>  
<property name="password" value="root"></property> 
</bean> 

<beans xmlns="http://www.springframework.org/schema/beans"  
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 xmlns:p="http://www.springframework.org/schema/p" 
 xmlns:util="http://www.springframework.org/schema/util"  
xmlns:context="http://www.springframework.org/schema/context" 
 xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans.xsd  
http://www.springframework.org/schema/util 
http://www.springframework.org/schema/util/spring-util.xsd  
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context.xsd"> 

⚫ 在spring配置文件使用标签引入外部属性文件 
<!--引入外部属性文件--> 
<context:property-placeholder location="classpath:jdbc.properties"/>
 <!--配置连接池-->
 <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> 
 <property name="driverClassName" value="${prop.driverClass}"></property> 
 <property name="url" value="${prop.url}"></property> 
 <property name="username" value="${prop.userName}"></property> 
 <property name="password" value="${prop.password}"></property>
 </bean>