1，set方法注入
（1）对于值类型的属性：
在对象中一定要有set方法
package com.songyan.demo1;
import com.songyan.injection.Car;
/**
* 要创建的对象类
* @author sy
*
*/
public class User {
private String name;
private int age ;/**
* 重写toString方法在输出对象时将属性值输出
*/
@Override
public String toString() {
return "name:"+this.name+",age:"+this.age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
在配置文件中进行配置
<!--在user对象中为属性名为name的属性赋值为“tom” --> <property name="name" value="tom"></property> <property name="age" value="18"></property> </bean>
测试
ApplicationContext applicationContext=new ClassPathXmlApplicationContext("com/songyan/injection/beans5.xml");
User user=(User)applicationContext.getBean("user");
System.out.println(user);
（2）对于引用类型的属性
package com.songyan.injection;
public class Car {
private String name;
private String color;
@Override
public String toString() {
return "【carname："+this.name+",carcolor:"+this.color+"】";
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
}
package com.songyan.demo1;
import com.songyan.injection.Car;
/**
* 要创建的对象类
* @author sy
*
*/
public class User {
private String name;
private int age ;
private Car car;
public Car getCar() {
return car;
}
public void setCar(Car car) {
this.car = car;
}
/**
* 重写toString方法在输出对象时将属性值输出
*/
@Override
public String toString() {
return "name:"+this.name+",age:"+this.age+",car:"+this.car;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
package com.songyan.injection;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.songyan.demo1.User;
public class Client {
public static void main(String[] args) {
ApplicationContext applicationContext=new ClassPathXmlApplicationContext("com/songyan/injection/beans5.xml");
User user=(User)applicationContext.getBean("user");
System.out.println(user);
}
}
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.springframework.org/schema/beans"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd ">
<!-- 引用类型的属性注入需要先将属性配置 -->
<bean name="car" class="com.songyan.injection.Car">
<property name="name" value="宝马"></property>
<property name="color" value="red"></property>
</bean>
<!--set 方法注入值类型 -->
<bean name="user" class="com.songyan.demo1.User">
<!--在user对象中为属性名为name的属性赋值为“tom” -->
<property name="name" value="tom"></property>
<property name="age" value="18"></property>
<!--引用类型的赋值使用ref属性 -->
<property name="car" ref="car"></property>
</bean>
</beans>
2，构造方法注入
package com.songyan.injection;
public class Car {
private String name;
private String color;
// 通过构造函数对属性赋值
public Car(String name, String color) {
super();
this.name = name;
this.color = color;
}
public Car() {
}
@Override
public String toString() {
return "【carname：" + this.name + ",carcolor:" + this.color + "】";
}
}
package com.songyan.demo1;
import com.songyan.injection.Car;
/**
* 要创建的对象类
* @author sy
*
*/
public class User {
private String name;
private int age ;
private Car car;
/**
* 通过构造函数对属性赋值
* @param name
* @param age
* @param car
*/
public User(String name, int age, Car car) {
super();
this.name = name;
this.age = age;
this.car = car;
}
public User()
{
}
/**
* 重写toString方法在输出对象时将属性值输出
*/
@Override
public String toString() {
return "name:"+this.name+",age:"+this.age+",car:"+this.car;
}
}
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.springframework.org/schema/beans"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd ">
<!-- 引用类型的属性注入需要先将属性配置 -->
<bean name="car" class="com.songyan.injection.Car">
<constructor-arg name="name" value="baoma"></constructor-arg>
<constructor-arg name="color" value="red"></constructor-arg>
</bean>
<!--构造方法注入值类型 -->
<bean name="user" class="com.songyan.demo1.User">
<!--在user对象中为属性名为name的属性赋值为“tom” -->
<constructor-arg name="name" value="tom"></constructor-arg>
<constructor-arg name="age" value="18"></constructor-arg>
<constructor-arg name="car" ref="car"></constructor-arg>
</bean>
</beans>
package com.songyan.injection;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.songyan.demo1.User;
public class Client {
public static void main(String[] args) {
ApplicationContext applicationContext=new ClassPathXmlApplicationContext("com/songyan/injection/beans5.xml");
User user=(User)applicationContext.getBean("user");
System.out.println(user);
}
}
3，p名称空间注入
4，spel注入
5，复杂类型注入
package com.songyan.injection;
public class Car {
private String name;
private String color;
// 通过构造函数对属性赋值
public Car(String name, String color) {
super();
this.name = name;
this.color = color;
}
public Car() {
}
@Override
public String toString() {
return "【carname：" + this.name + ",carcolor:" + this.color + "】";
}
}
package com.songyan.complex;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Properties;
public class Complex {
private Object[] obj;//数组类型注入
private List list;//list类型注入
private Map map;//map类型注入
private Properties properties;//文件类型注入
@Override
public String toString() {
return "array:"+Arrays.toString(obj)+" \nlist:"+this.list+" \nproperties:"+this.properties+"\nmap:"+this.map;
}
public Object[] getObj() {
return obj;
}
public void setObj(Object[] obj) {
this.obj = obj;
}
public List getList() {
return list;
}
public void setList(List list) {
this.list = list;
}
public Map getMap() {
return map;
}
public void setMap(Map map) {
this.map = map;
}
public Properties getProperties() {
return properties;
}
public void setProperties(Properties properties) {
this.properties = properties;
}
}
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.springframework.org/schema/beans"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd ">
<!-- 引用类型的属性注入需要先将属性配置 -->
<bean name="car" class="com.songyan.injection.Car">
<constructor-arg name="name" value="baoma"></constructor-arg>
<constructor-arg name="color" value="red"></constructor-arg>
</bean>
<bean name="complex" class="com.songyan.complex.Complex">
<!--数组类型-->
<!--数组中只有一个值类型 -->
<!-- <property name="obj" value="tom"></property> -->
<!--数组中只有一个引用类型 -->
<!-- <property name="obj" ref="car"></property> -->
<!--数组中有多个值 -->
<property name="obj" >
<array>
<value>tom</value>
<value>jack</value>
<ref bean="car" />
</array>
</property>
<!--map类型 -->
<property name="map">
<map>
<entry key="name" value="zhangsan"></entry>
<entry key="car" value-ref="car"></entry>
</map>
</property>
<!--list类型 -->
<!--一个值 -->
<!-- <property name="list" value="jack"></property> -->
<!--多个值 -->
<property name="list">
<list>
<value>jack1</value>
<value>jack2</value>
<ref bean="car"/>
</list>
</property>
<!--properties -->
<property name="properties">
<props>
<prop key="name">user</prop>
<prop key="pass">123</prop>
<prop key="id">192.168.1.1</prop>
</props>
</property>
</bean>
</beans>
package com.songyan.complex;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.songyan.demo1.User;
public class Cliect {
public static void main(String[] args) {
ApplicationContext applicationContext=new ClassPathXmlApplicationContext("com/songyan/complex/beans.xml");
Complex complex=(Complex)applicationContext.getBean("complex");
System.out.println(complex);
}
}
原文地址：https://www.cnblogs.com/excellencesy/p/9129578.html
时间： 2024-11-15 09:48:25