详解SpringBean基于XML的装配

1.设值注入：通过反射调用setXxx注入属性值

package com.itheima.assemble;
import java.util.List;
public class User {
 private String username;
 private Integer password;
 private List<String> list;
 /**
  * 设值注入 
  * 提供默认空参构造方法 ;
  * 为所有属性提供setter方法。
  */
 public User() {
  super();
 }
 public void setUsername(String username) {
  this.username = username;
 }
 public void setPassword(Integer password) {
  this.password = password;
 }
 public void setList(List<String> list) {
  this.list = list;
 }
 @Override
 public String toString() {
  return "User [username=" + username + ", password=" + password +
    ", list=" + list + "]";
 }

}

package com.itheima.assemble;
import org.springframework.context.ApplicationContext;
import 
 org.springframework.context.support.ClassPathXmlApplicationContext;
public class XmlBeanAssembleTest {
 public static void main(String[] args) {
  String xmlPath = "com/itheima/assemble/beans5.xml";
  ApplicationContext applicationContext = 
      new ClassPathXmlApplicationContext(xmlPath);
  // 构造方式输出结果
  System.out.println(applicationContext.getBean("user2"));
 }
}

<?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-4.3.xsd">
  
 <!--2.使用设值注入方式装配User实例 -->
 <bean id="user2" class="com.itheima.assemble.User">
  <property name="username" value="张三"></property>
  <property name="password" value="654321"></property>
  <!-- 注入list集合 -->
  <property name="list">
   <list>
    <value>"值1"</value>
    <value>"值2"</value>
   </list>
  </property>
 </bean>
</beans>

在这里插入图片描述

2.构造注入：用+其value属性注入属性值

package com.itheima.assemble;
import java.util.List;
public class User {
 private String username;
 private Integer password;
 private List<String> list;
 /**
  * 用构造注入 
  * 创建带所有参数的有参构造方法。
  */
 public User(String username, Integer password, List<String> list) {
  super();
  this.username = username;
  this.password = password;
  this.list = list;
 }

 @Override
 public String toString() {
  return "User [username=" + username + ", password=" + password +
    ", list=" + list + "]";
 }
}

package com.itheima.assemble;
import org.springframework.context.ApplicationContext;
import 
 org.springframework.context.support.ClassPathXmlApplicationContext;
public class XmlBeanAssembleTest {
 public static void main(String[] args) {
  String xmlPath = "com/itheima/assemble/beans5.xml";
  ApplicationContext applicationContext = 
      new ClassPathXmlApplicationContext(xmlPath);
  // 构造方式输出结果
  System.out.println(applicationContext.getBean("user1"));
 }
}

<?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-4.3.xsd">
  
 <!--1.使用构造注入方式装配User实例user1，装配后user1则内含多个注入数据的属性 -->
 <bean id="user1" class="com.itheima.assemble.User">
  <constructor-arg index="0" value="tom" /><!-- 属性1，即username -->
  <constructor-arg index="1" value="123456" /> <!-- 属性2，即password -->
  <constructor-arg index="2">  <!-- 属性3 -->
   <list>
    <value>"值1"</value>
    <value>"值2"</value>
   </list>
  </constructor-arg>
 </bean>
</beans>

在这里插入图片描述

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