Java框架【Spring - 注入对象】

目录

0、注入对象

1、Product.java

2、applicationContext.xml

3、TestSpring

4、参考链接

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0、注入对象

在上例中，对Category的name属性注入了"category 1"字符串 
在本例中 ，对Product对象，注入一个Category对象

 

1、Product.java

Product类中有对Category对象的setter getter

package com.how2java.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;
    }
}

 

2、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

<?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>
    <bean name="p" class="com.how2java.pojo.Product">
        <property name="name" value="product1" />
        <property name="category" ref="c" />
    </bean>
 
</beans>

 

3、TestSpring

通过Spring拿到的Product对象已经被注入了Category对象了

package com.how2java.test;
 
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
 
import com.how2java.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());
    }
}

 

4、参考链接

[01] How2j - Spring - 注入对象

本文地址：https://blog.csdn.net/youyouwuxin1234/article/details/110230162