一个关于Spring注入java程序

1.导入Spring的核心包 。

创建class A加有属性 string list map properties 还有一test()方法用以测试输出 。

public class A {

private String str;

private List list;

private Map map;

private Properties properties;

public void setProperties(Properties properties) {

this.properties = properties;

}

public void setMap(Map map) {

this.map = map;

}

public void setList(List list) {

this.list = list;

}

public void setStr(String str) {

this.str = str;

}

public void test(){

System.out.println("str==>"+str);

System.out.println("list==>"+list);

System.out.println("map==>"+map);

System.out.println("Properties==>"+properties);

}

}

------------------------------

2.创建class B 用于构造注入和spring ref 关联

public class B {

private String name;

private int age;

public B(){}

//有参构造

public B(String name,int age) {

this.name = name;

this.age = age;

}

@Override

public String toString() {

return "B--------->"+name+age;

}

}

-------------------------------

3.用于测试的class Test.

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test {

public static void main(String[] args) {

ApplicationContext acx=new ClassPathXmlApplicationContext("/ApplicationContext.xml");

A a=(A) acx.getBean("a");

a.test();

}

}

-----------------------------------

4.建spring 的applicationcontext.xml （复制即可）

<?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-2.5.xsd">

<bean id="b" class="com.fit.B">

<constructor-arg value="nihao" index="0"/><!-- 通过构造参数实例化Bean -->

<constructor-arg value="20" index="1"/>

</bean>

<bean id="a" class="com.fit.A"><!-- 多个属性 String str,List list,Map map, properties -->

<property name="str" value="您好"/><!-- 赋值 -->

<property name="list"><!-- 集合 -->

<list>

<value>123</value>

<value>456</value>

<ref bean="b"/><!-- 集合 对象 -->

</list>

</property>

<property name="map">

<map>

<entry key="1" value="123456"/><!-- map -->

<entry key="2" value="987665"/>

<entry key="3" value-ref="b"/><!-- map 对象 -->

</map>

</property>

<property name="properties"><!-- 属性 键值对 -->

<value>

a=123

b=456

c=789

</value>

</property>

</bean>

</beans>

运行Test 的main方法 你会看到结果