Main.java
package com.vow.spring;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main {
public static void main(String[] args) {
//1. 創建 Spring 的 IOC 容器
ClassPathXmlApplicationContext ctx =
new ClassPathXmlApplicationContext("applicationContext.xml");
//2. 從 IOC 容器中獲取 bean 的實例
HelloWorld helloWorld = (HelloWorld) ctx.getBean("helloworld");
//3. 使用 bean
helloWorld.printf();
}
}
方式一:通過構造函數給屬性賦值
1) 通過構造函數
value:屬性值,在沒有設置index和type時,設置value值的類型和value的順序要和構造函數參數類型的順序一致
index:設置參數在構造函數參數中的索引,從0開始
type :設置參數的類型,寫全限定名
ps: 可混合使用
HelloWorld。java
package com.vow.spring;
public class HelloWorld {
private String name;
private int age;
private String sex;
public String getName() {
return name;
}
public HelloWorld(String name, int age, String sex) {
super();
this.name = name;
this.age = age;
this.sex = sex;
}
public void printf()
{
System.out.println(name);
System.out.println(age);
System.out.println(sex);
}
}
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 http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 配置一個 bean -->
<bean id="helloworld" class="com.vow.spring.HelloWorld">
<constructor-arg value="vow2"></constructor-arg>
<constructor-arg value="19"></constructor-arg>
<constructor-arg value="男"></constructor-arg>
</bean>
</beans>
結果:
方式二:通過set方法給屬性賦值(在spring的bean中使用<property>標籤)
HelloWorld.java
package com.vow.spring;
public class HelloWorld {
private String name;
private int age;
private String sex;
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;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public void printf()
{
System.out.println(name);
System.out.println(age);
System.out.println(sex);
}
}
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 http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 配置一個 bean -->
<bean id="helloWorld" class="com.vow.spring.HelloWorld" >
<爲屬性賦值 >
<property name="name" value="vow"></property>
<property name="age" value="18"> </property>
<property name="sex" value="男"> </property>
</bean>
</beans>
結果:
方式三:通過p命名空間給屬性賦值
<!-- 給對象屬性注入值: # p 名稱空間給對象的屬性注入值 (spring3.0以上版本才支持) -->
<!-- p名稱空間優化後 -->
<bean id="user" class="cn.itcast.c_property.User" p:name="Jack" p:id="123"></bean>