Spring Ioc 使用XML配置
1、首先到引入依赖包
<!--引入配置-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.1.6.RELEASE</version>
</dependency>
2、创建Spring配置文件，一般取名这三个（任意 无约定） spring-context.xml、applicationContext.xml、beans.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:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
</beans>
3、创建一个使用ioc创建一个对象 并且帮他设置好初始值
3.1首先创建好Class 这边有两个类一个是学生类 和 地址类
3.1.1学生类 Student.java 并设置他的get和set 方法要不要xml配置不了属性
//Student.java
package com.ared.entity;
import java.util.List;
import java.util.Properties;
import java.util.Set;
public class Student {
private int id;
private String name;
private List<String> phone;
private Set<String> oldName;
private Properties info;
private Address address;
public Student(){
System.out.println("----Constructor----");
}
public void init(){
System.out.println("-----init------");
}
public void destroy(){
System.out.println("-----destroy-----");
}
public Student(int id, String name, List<String> phone, Set<String> oldName, Properties info, Address address) {
this.id = id;
this.name = name;
this.phone = phone;
this.oldName = oldName;
this.info = info;
this.address = address;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<String> getPhone() {
return phone;
}
public void setPhone(List<String> phone) {
this.phone = phone;
}
public Set<String> getOldName() {
return oldName;
}
public void setOldName(Set<String> oldName) {
this.oldName = oldName;
}
public Properties getInfo() {
return info;
}
public void setInfo(Properties info) {
this.info = info;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
@Override
public String toString() {
return "Student{" +
"id=" + id +
", name='" + name + '\'' +
", phone=" + phone +
", oldName=" + oldName +
", info=" + info +
", address=" + address +
'}';
}
}
3.1.2地址类 Address.java
//Address.java
package com.ared.entity;
public class Address {
String homeAddress;
String officeAddress;
public String getHomeAddress() {
return homeAddress;
}
public void setHomeAddress(String homeAddress) {
this.homeAddress = homeAddress;
}
public String getOfficeAddress() {
return officeAddress;
}
public void setOfficeAddress(String officeAddress) {
this.officeAddress = officeAddress;
}
@Override
public String toString() {
return "Address{" +
"homeAddress='" + homeAddress + '\'' +
", officeAddress='" + officeAddress + '\'' +
'}';
}
}
3.1.3配置Spring配置文件 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:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<bean id="address" class="com.ared.entity.Address">
<property name="homeAddress" value="青山湖"/>
<property name="officeAddress" value="高新"/>
</bean>
<bean id="student" class="com.ared.entity.Student">
<property name="id" value="10001"/>
<property name="name" value="码小农"/>
<!-- 添加一个list参数 -->
<property name="phone">
<list>
<value>13711112222</value>
<value>13711112223</value>
</list>
</property>
<!-- 添加一个set参数 -->
<property name="oldName">
<set>
<value>小明</value>
<value>小红</value>
</set>
</property>
<!--添加一个Properties参数-->
<property name="info">
<props>
<prop key="username">admin</prop>
<prop key="password">123456</prop>
</props>
</property>
<!--如果属性有对象的话可以先创建bean 然后使用ref 应用id 得到值-->
<property name="address" ref="address"/>
</bean>
</beans>
3.1.4写一个测试类 IocTest.java
package com.ared.test;
import com.ared.entity.Student;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class IocTest {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationcontext.xml");
Student student = (Student) context.getBean("student");
System.out.println(student);
}
}
3.1.5使用 在Bean创建时会可以指定一个 初始方法 和 销毁方法 只需要修改Bean 标签上加一个 init-method 和 destroy-method
<bean id="student" class="com.ared.entity.Student" init-method="init" destroy-method="destroy">
3.1.6 自动装配 如果你的Bean中需要注入其他对象的话 你可以使用 autowire 这个标签注入 他有两种注入方式
1、一种是根据id名字注入
<bean id="student" class="com.ared.entity.Student" autowire="byName">
2、二种是更具类型注入
<bean id="student" class="com.ared.entity.Student" autowire="byType">
3.1.7 单例和多例 scope
1、单例模式：当xml加载到spring中 只要是 scope="singleton" 然后 默认都是单例模式 spring加载的时候就会把这些对象创建好
<bean id="student" class="com.ared.entity.Student" scope="singleton">
2、多例模式： 当每次getBean的时候才创建一个新的对象 初始话的时候不会创建
<bean id="student" class="com.ared.entity.Student" scope="prototype">
