Spring IOC/DI 基本配置 及测试 /注入对象 火推

新建spring项目 (java project类型)

---

配置jar包

把jar包导入到项目中，导包办法：右键 project->properties->java build path->libaries->add external jars

---

准备pojo Category 类，用来演示IOC和DI

package com.lj.pojo;

public class Category {
     public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        private int id;
        private String name;
}

---

在src目录下新建applicationContext.xml文件
applicationContext.xml是Spring的核心配置文件，通过关键字c即可获取Category对象，该对象获取的时候，即被注入了字符串”category 1“到name属性中

<?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:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
   http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/aop
   http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
   http://www.springframework.org/schema/tx
   http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
   http://www.springframework.org/schema/context     
   http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <bean name="c" class="com.how2java.pojo.Category">
        <property name="name" value="category 1" />
    </bean>

</beans>

---

测试代码，演示通过spring获取Category对象，以及该对象被注入的name属性。
如图所示，可以打印出通过Spring拿到的Category对象的name属性

package com.lj.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.lj.pojo.Category;

public class TestSpring {
     public static void main(String[] args) {
            ApplicationContext context = new ClassPathXmlApplicationContext(
                    new String[] { "applicationContext.xml" });

            Category c = (Category) context.getBean("c");

            System.out.println(c.getName());
        }

}

---

测试结果，控制台 输出

---

注入对象：
根据上面完成的代码操作：
Product类

package com.lj.pojo;

public class Product {

    private int id;
    private String name;
    private Category category;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Category getCategory() {
        return category;
    }
    public void setCategory(Category category) {
        this.category = category;
    }
}

---

applicationContext.xml
在创建Product的时候注入一个Category对象
注意，这里要使用ref来注入另一个对象

<bean name="c" class="com.lj.pojo.Category">
        <property name="name" value="category 1" />
    </bean>
    <bean name="p" class="com.lj.pojo.Product">
        <property name="name" value="product1" />
        <property name="category" ref="c" />
    </bean>

---

TestSpring类

package com.lj.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.lj.pojo.Category;
import com.lj.pojo.Product;

public class TestSpring {
     public static void main(String[] args) {
            ApplicationContext context = new ClassPathXmlApplicationContext(
                    new String[] { "applicationContext.xml" });

            Product p = (Product) context.getBean("p");

            System.out.println(p.getName());
            System.out.println(p.getCategory().getName());
        }

}

---

结果展示：

---