文章目录
- 依赖注入：Set注入！
– 依赖：bean对象的创建依赖于容器！
– 注入：bean对象中的所有属性，由容器来注入！
一. 通过 Set 方式注入[ 重点 ]
1.1 Address 类
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 + '\'' +
'}';
}
}
1.2 Student 类
public class Student {
private String name;
private Address address;
private String[] books;
private List<String> hobbys;
private Map<String,String> card;
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> getCard() {
return card;
}
public void setCard(Map<String, String> card) {
this.card = card;
}
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 +
", card=" + card +
", games=" + games +
", wife='" + wife + '\'' +
", info=" + info +
'}';
}
}
1.3 beans.xml 配置文件
<?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:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd">
<bean id="address" class="pojo.Address"/>
<bean id="student" class="pojo.Student">
<!-- 普通注入 -->
<property name="name" value="kc"/>
<!--第二种，Bean注入，ref-->
<property name="address" ref="address"/>
<!--数组-->
<property name="books">
<array>
<value>刘师傅爱情技巧真传</value>
<value>刘师傅教你如何一夜暴富</value>
<value>刘师傅教你如何走上人生巅峰</value>
<value>刘师傅成功学</value>
</array>
</property>
<!--List-->
<property name="hobbys">
<list>
<value>听歌</value>
<value>敲代码</value>
<value>看电影</value>
</list>
</property>
<!--Map-->
<property name="card">
<map>
<entry key="身份证" value="1111112222223333"/>
<entry key="银行卡" value="123123123123123123"/>
</map>
</property>
<!--Set-->
<property name="games">
<set>
<value>LOL</value>
<value>COC</value>
<value>BOB</value>
</set>
</property>
<!--null-->
<property name="wife">
<null/>
</property>
<!--Properties-->
<property name="info">
<props>
<prop key="driver">20190525</prop>
<prop key="url">男</prop>
<prop key="username">root</prop>
<prop key="password">123456</prop>
</props>
</property>
</bean>
</beans>
1.4 测试类
public class MyTest {
public static void main(String[] args) {
ApplicationContext context =
new ClassPathXmlApplicationContext("beans.xml");
Student student = (Student) context.getBean("student");
System.out.println(student.toString());
}
}
1.5 结果
- Student{name=‘kc’, address=Address{address=‘null’},
- books=[刘师傅爱情技巧真传, 刘师傅教你如何一夜暴富, 刘师傅教你如何走上人生巅峰, 刘师傅成功学],
- hobbys=[听歌, 敲代码, 看电影],
- card={身份证=1111112222223333, 银行卡=123123123123123123}, - games=[LOL, COC, BOB],
- wife=‘null’,
- info={password=123456, url=男, driver=20190525, username=root}}
二. 拓展空间注入（p命名空间、c命名空间）
我们可以使用p命名空间和c命名空间进行注入
2.1 beans.xml 配置文件
<?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:p="http://www.springframework.org/schema/p"
xmlns:c="http://www.springframework.org/schema/c"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!--p命名空间注入，可以直接注入属性的值：property-->
<bean id="user" class="com.chen.pojo.User" p:name="陈浩" p:age="18" />
<!--c命名空间注入，通过构造器注入属性的值：construct-args-->
<bean id="user2" class="com.chen.pojo.User" c:age="18" c:name="陈浩"/>
</beans>
2.2 测试类
@Test
public void test2(){
ApplicationContext context = new ClassPathXmlApplicationContext("userbean.xml");
Object user = context.getBean("user2",User.class);
System.out.println(user);
}
2.3 注意点
p命名和c命名空间不能直接使用，需要导入 xml 约束（Spring官方文档有）
xmlns:c="http://www.springframework.org/schema/c"
xmlns:p="http://www.springframework.org/schema/p"