1.构造器注入
前面已经使用过
2.set注入【重点】
依赖注入：set注入
依赖：bean对象的创建依赖于spring容器
注入：bean对象中的所有属性由spring容器注入
环境搭建：
（1）导入依赖
<dependencies>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>5.3.20</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.3.20</version>
</dependency>
</dependencies>（2）编写实例
Address.java
public class Address {
private String address;
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "Address{" +
"address='" + address + '\'' +
'}';
}
}Student .java
public class Student {
private String name;
private Address address;
private String[] books;
private List<String> hobbys;
private Map<String,String> cards;
private Set<String> games;
private String wife;
private Properties info;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
public String[] getBooks() {
return books;
}
public void setBooks(String[] books) {
this.books = books;
}
public List<String> getHobbys() {
return hobbys;
}
public void setHobbys(List<String> hobbys) {
this.hobbys = hobbys;
}
public Map<String, String> getCards() {
return cards;
}
public void setCards(Map<String, String> cards) {
this.cards = cards;
}
public Set<String> getGames() {
return games;
}
public void setGames(Set<String> games) {
this.games = games;
}
public String getWife() {
return wife;
}
public void setWife(String wife) {
this.wife = wife;
}
public Properties getInfo() {
return info;
}
public void setInfo(Properties info) {
this.info = info;
}
@Override
public String toString() {
return "Student{" +
"name='" + name + '\'' +
", address=" + address +
", books=" + Arrays.toString(books) +
", hobbys=" + hobbys +
", cards=" + cards +
", games=" + games +
", wife='" + wife + '\'' +
", info=" + info +
'}';
}
}3.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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
https://www.springframework.org/schema/beans/spring-beans.xsd">
</beans>4. 注入的实现
<bean id="address" class="com.zuo.dao.Address">
<property name="address" value="左家旁峪村"/>
</bean>
<bean id="studentName" class="com.zuo.dao.Student">
<!--普通值的注入 value -->
<property name="name" value="zuozhikun"/>
<!--bean的注入 ref-->
<property name="address" ref="address"/>
<!--数组-->
<property name="books">
<array>
<value>水浒传</value>
<value>三国演义</value>
<value>西游记</value>
<value>红楼梦</value>
</array>
</property>
<!--list-->
<property name="hobbys">
<list>
<value>唱</value>
<value>跳</value>
<value>篮球</value>
<value>rap</value>
</list>
</property>
<!--map-->
<property name="cards">
<map>
<entry key="身份证" value="37032319910200817"/>
<entry key="姓名" value="左志锟"/>
</map>
</property>
<!--集合-->
<property name="games">
<set>
<value>LOL</value>
<value>CF</value>
<value>PUBG</value>
</set>
</property>
<!--null-->
<property name="wife" value=""/>
<!--property-->
<property name="info">
<props>
<prop key="性别">男</prop>
<prop key="电话号码">19558986127</prop>
<prop key="身高">178</prop>
</props>
</property>
</bean>3.拓展方式注入
（1）p命名空间注入
引入配置信息
xmlns:p="http://www.springframework.org/schema/p"编写bean
<!--p命名空间注入，可以直接注入属性值：property-->
<bean id="user" class="com.zuo.dao.User" p:name="zuo" p:pwd="123456" />测试
@Test
public void test2(){
//获取spring容器
ApplicationContext context = new ClassPathXmlApplicationContext("ApplicationContext.xml");
User user = (User) context.getBean("user");
System.out.println(user.toString());
}官方简介
（2）c命名空间注入
引入配置信息
xmlns:c="http://www.springframework.org/schema/c"编写bean
<!--c命名空间注入，通过构造器注入：constructor-arg-->
<bean id="user" class="com.zuo.dao.User" c:name="song" c:pwd="123456" />测试
@Test
public void test2(){
//获取spring容器
ApplicationContext context = new ClassPathXmlApplicationContext("ApplicationContext.xml");
User user = (User) context.getBean("user");
System.out.println(user.toString());
}官方简介
4.Bean作用域
（1）singleton
单例模式（spring默认机制，每次从容器中get的对象都是同一个对象）
显示设置单例模式：
<bean id="user2" class="com.zuo.dao.User" c:name="song" c:pwd="123456" scope="singleton"/>（2）prototype
原型模式（每次从容器中get 的对象都为一个新的对象）
设置原型模式：
<!--c命名空间注入，通过构造器注入：constructor-arg-->
<bean id="user2" class="com.zuo.dao.User" c:name="song" c:pwd="123456" scope="prototype"/>
测试：
@Test
public void test3(){
//获取spring容器
ApplicationContext context = new ClassPathXmlApplicationContext("ApplicationContext.xml");
User user1 = (User) context.getBean("user2");
User user2 = (User) context.getBean("user2");
System.out.println(user1==user2);
}
（3）其他
request，session，application，websocket只能在web开发中使用！！
标签：依赖,return,String,DI,void,private,address,public,注入 From： https://www.cnblogs.com/zuok/p/17053162.html