正文
Spring bean注入
小程序：扫一扫查出行【扫一扫了解最新限行尾号】
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1.构造方法注入
1.bean类
public class User {
private String name;
private Integer age;
private Cat cat;
public User(String name,Integer age,Cat cat){
this.name=name;
this.age=age;
this.cat=cat;
} @Override
public String toString() {
return "User"+"name"+name+"age"+age+"cat"+cat.getName();
}
} 2.测试方法
public void demo1(){
ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
User user=(User)applicationContext.getBean("user");
System.out.println(user);
} 3.xml文件配置
<!--构造方法 注入-->
<bean id="user" class="com.imooc.ioc.demo4.User">
<constructor-arg name="name" value="张三"></constructor-arg>
<constructor-arg name="age" value="13"></constructor-arg>
<constructor-arg name="cat" ref="cat"></constructor-arg>
</bean>
<bean id="cat" class="com.imooc.ioc.demo4.Cat">
<property name="name" value="cat"></property>
</bean>
2.set方法注入
1.bean类
public class Person {
private String name;
private Integer age;
private Cat cat;
public void setCat(Cat cat) {
this.cat = cat;
}
public Cat getCat() {
return cat;
}
public void setName(String name) {
this.name = name;
}
public void setAge(Integer age) {
this.age = age;
}
public String getName() {
return name;
}
public Integer getAge() {
return age;
}
@Override
public String toString() {
return "name"+name+"age"+age+"cat"+cat.getName();
}
}
2.测试方法
public void demo2(){
ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
Person person=(Person)applicationContext.getBean("person1");
System.out.println(person);
}
3.xml文件配置
<!--set方法注入-->
<bean id="person1" class="com.imooc.ioc.demo4.Person">
<property name="age" value="12"></property>
<property name="name" value="李四"></property>
<property name="cat" ref="cat"></property>
</bean>
3.复杂类型的注入
数组 List set Map Properties
package com.imooc.ioc.demo5; import java.util.*; /*
*
*
* 复杂类型注入*/
public class CollectionBean {
private String[] args; //数组类型
private List<String> list;//list集合
private Set<String> set ;//set集合
private Map<String,Integer> map;
private Properties properties; public List<String> getList() {
return list;
} public Map<String, Integer> getMap() {
return map;
} public Properties getProperties() {
return properties;
} public Set<String> getSet() {
return set;
} public String[] getArgs() {
return args;
} public void setList(List<String> list) {
this.list = list;
} public void setMap(Map<String, Integer> map) {
this.map = map;
} public void setProperties(Properties properties) {
this.properties = properties;
} public void setSet(Set<String> set) {
this.set = set;
} public void setArgs(String[] args) {
this.args = args;
} @Override
public String toString() {
return "arrs"+ Arrays.toString(args)+"list"+list+"map"+map+"properties"+properties+"set"+set;
}
} 2.测试方法
public void demo1(){
ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
CollectionBean collectionBean=(CollectionBean)applicationContext.getBean("collectionBean");
System.out.println(collectionBean);
}
3.配置文件
<bean id="collectionBean" class="com.imooc.ioc.demo5.CollectionBean" >
<!--数组的属性注入-->
<property name="args">
<list>
<value>aaa</value>
<value>bbb</value>
<value>ccc</value>
</list>
</property>
<!--list的属性注入-->
<property name="list">
<list>
<value>111</value>
<value>333</value>
<value>222</value>
</list>
</property>
<!--set集合的属性注入-->
<property name="set">
<set>
<value>ddd</value>
<value>eee</value>
<value>fff</value>
</set>
</property>
<!--map的属性注入-->
<property name="map">
<map>
<entry key="aaa" value="111"></entry>
<entry key="bbb" value="222"></entry>
</map>
</property>
<!--properties的属性注入-->
<property name="properties">
<props>
<prop key="username">zhangsan</prop>
</props>
</property>
</bean>
