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一、构造方法方式注入
1、项目结构如下：
2、新建Customer类
package hjp.spring.attributeinject; public class Customer { private String name; private Integer age; private String city; public Customer() { } public Customer(String name, Integer age) { this.name = name; this.age = age; } public Customer(Integer age, String city) { this.age = age; this.city = city; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public String getCity() { return city; } public void setCity(String city) { this.city = city; } @Override public String toString() { return "Customer [name=" + name + ", age=" + age + ", city=" + city + "]"; } }
3、新建beans.xml文件
<?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"> <!-- 如果没有配置 constructor-arg节点，则使用无参构造器--> <bean id="customerId" class="hjp.spring.attributeinject.Customer"> <!--constructor-arg 配置构造参数 index 表示参数索引号 type 设置参数数据类型 value 设置普通数据 ref 设置引用数据 如果只使用index和value，而不指定数据类型，则默认匹配符合条件的第一个构造函数 如果配置了type，那么索引处的数据类型要对应正确 --> <constructor-arg index="0" value="23" type="java.lang.Integer"></constructor-arg> <constructor-arg index="1" value="Tom" type="java.lang.String"></constructor-arg> </bean> </beans>
4、新建测试类
package hjp.spring.attributeinject; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class TestApp { @Test public void demo1() { ApplicationContext applicationContext = new ClassPathXmlApplicationContext( "hjp/spring/attributeinject/beans.xml"); Customer customer = applicationContext.getBean("customerId", Customer.class); System.out.println(customer); } }
二、setter方法注入
1、新增类Contact
package hjp.spring.attributeinject; public class Contact { private String address; private String telphone; public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } public String getTelphone() { return telphone; } public void setTelphone(String telphone) { this.telphone = telphone; } @Override public String toString() { return "Contact [address=" + address + ", telphone=" + telphone + "]"; } }
2、为Customer类新增属性contact，新增构造函数
public Customer(String name,Integer age,Contact contact){
this.name=name;
this.age=age;
this.contact=contact;
}
package hjp.spring.attributeinject; public class Customer { private String name; private Integer age; private String city; private Contact contact; public Contact getContact() { return contact; } public void setContact(Contact contact) { this.contact = contact; } public Customer() { } public Customer(String name, Integer age) { this.name = name; this.age = age; } public Customer(Integer age, String city) { this.age = age; this.city = city; } public Customer(String name,Integer age,Contact contact){ this.name=name; this.age=age; this.contact=contact; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public String getCity() { return city; } public void setCity(String city) { this.city = city; } @Override public String toString() { return "Customer [name=" + name + ", age=" + age + ", city=" + city + ", contact=" + contact + "]"; } }
3、更改beans.xml文件
<?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"> <bean id="customerId" class="hjp.spring.attributeinject.Customer"> <property name="name" value="Tom"></property> <property name="age" value="23"></property> <property name="contact" ref="contactId"></property> </bean> <bean id="contactId" class="hjp.spring.attributeinject.Contact"> <property name="address" value="北京"></property> <property name="telphone" value="12345678"></property> </bean> </beans>
4、测试类不变
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原文地址：http://www.cnblogs.com/hujiapeng/p/4779164.html
