Spring配置
5 Spring配置
- 别名
- Bean配置
- import
<import resource="beans1.xml">
<import resource="beans2.xml">
<import resource="beans3.xml">
一般用于团队开发，导入合并为一个，项目中多人开发，不同类需要注册在不同在bean中，可以利用import将不同的bean合并为总的，使用时直接使用总的。
6 依赖注入
6.1 构造器注入
6.2 Set方式注入
- 依赖：bean对象的创建依赖于容器
- 注入：bean对象中所有的属性，由容器来注入！
【环境搭建】
- 复杂类型
package com.kuang.pojo;
/**
* @author shkstart
* @create 2020-09-15 14:49
*/
public class Address {
private Address address;
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
}
- 真实情况创建
package com.kuang.pojo;
import java.util.*;
/**
* @author shkstart
* @create 2020-09-15 14:49
*/
public class Student {
private String name;
private Address address;
private String[] books;
private List<String> hobbies;
private Map<String,String> card;
private Set<String> games;
private String wife;
private Properties info;
public String getName() {
return name;
}
public Address getAddress() {
return address;
}
public String[] getBooks() {
return books;
}
public List<String> getHobbies() {
return hobbies;
}
public Map<String, String> getCard() {
return card;
}
public Set<String> getGames() {
return games;
}
public String getWife() {
return wife;
}
public Properties getInfo() {
return info;
}
public void setName(String name) {
this.name = name;
}
public void setAddress(Address address) {
this.address = address;
}
public void setBooks(String[] books) {
this.books = books;
}
public void setHobbies(List<String> hobbies) {
this.hobbies = hobbies;
}
public void setCard(Map<String, String> card) {
this.card = card;
}
public void setGames(Set<String> games) {
this.games = games;
}
public void setWife(String wife) {
this.wife = wife;
}
public void setInfo(Properties info) {
this.info = info;
}
@Override
public String toString() {
return "Student{" +
"name='" + name + '\'' +
", address=" + address +
", books=" + Arrays.toString(books) +
", hobbies=" + hobbies +
", card=" + card +
", games=" + games +
", wife='" + wife + '\'' +
", info=" + info +
'}';
}
}
- beans.xml
<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
https://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="student" class="com.kuang.pojo.Student">
<property name="name" value="liutao"/>
bean>
beans>
- 测试类
import com.kuang.pojo.Student;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
* @author shkstart
* @create 2020-09-15 15:00
*/
public class MyTest {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
Student st = (Student) context.getBean("student");
System.out.println(st.getAddress());
}
}
完善注入信息
<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
https://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="address" class="com.kuang.pojo.Address">
bean>
<bean id="student" class="com.kuang.pojo.Student">
<property name="name" value="liutao"/>
<property name="address" ref="address"/>
<property name="books">
<array>
<value>红楼梦value>
<value>水浒传value>
<value>三国演义value>
<value>红楼梦value>
array>
property>
<property name="hobbies">
<list>
<value>听歌value>
<value>看电影value>
<value>写代码value>
list>
property>
<property name="card">
<map>
<entry key="身份证" value="111112222"/>
<entry key="银行卡" value="23541455254"/>
map>
property>
<property name="games">
<set>
<value>LOLvalue>
<value>COCvalue>
<value>ABCvalue>
set>
property>
<property name="wife">
<null>null>
property>
<property name="info">
<props>
<prop key="学号">2019020202prop>
<prop key="性别">男prop>
<prop key="姓名">刘涛prop>
props>
property>
bean>
beans>
6.3 扩展方式注入
<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:c="http://www.springframework.org/schema/c"
xsi:schemaLocation="http://www.springframework.org/schema/beans
https://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="user" class="com.kuang.pojo.User"
p:name="liutao" p:age="12"/>
<bean id="user2" class="com.kuang.pojo.User"
c:age="14" c:name="liudeyang">
bean>
beans>
test:
@Test
public void myTest(){
ApplicationContext context = new ClassPathXmlApplicationContext("userbean.xml");
User user = (User) context.getBean("user");
System.out.println(user.toString());
}
注意点：
- p命名和c命名不能直接导入，需要xml约束，具体见官网：https://docs.spring.io/spring-framework/docs/5.1.17.RELEASE/spring-framework-reference/core.html#beans-p-namespace
6.4 bean的作用域
1.单例模式（默认）
2.原型模式
每次从容器中get时都会产生新的对象
3.其余的request,session,application 在web中开发