Spring Bean xml显式装配之构造函数

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对于喜欢用xml配置文件来说，xml装配bean

例子还是老师注入学生bean

1.老师和学生接口

package com.jack.bean.chatpter2.autowiredBeanJava;public interface Student {void learn();}

package com.jack.bean.chatpter2.autowiredBeanJava;public interface Teacher {void teach();}

2.老师和学生实现类

package com.jack.bean.chatpter2.autowiredBeanJava;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Component;public class StudentXiaoMing  implements Student{Logger logger = LoggerFactory.getLogger(StudentXiaoMing.class);public void learn() {logger.info("小明同学正在学习");}}

package com.jack.bean.chatpter2.autowiredBeanJava;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Component;public class TeacherWang implements Teacher {private Student student;public TeacherWang(Student student){this.student = student;}Logger logger = LoggerFactory.getLogger(TeacherWang.class);public void teach() {logger.info("王老师在教学");}public Student getStudent() {return student;}public void setStudent(Student student) {this.student = student;}}

3.关键配置xml配置文件

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:p="http://www.springframework.org/schema/p"xmlns:c="http://www.springframework.org/schema/c"xmlns:util="http://www.springframework.org/schema/util"xmlns:aop="http://www.springframework.org/schema/aop"xmlns:mvc="http://www.springframework.org/schema/mvc"xmlns:tx="http://www.springframework.org/schema/tx"xmlns:context="http://www.springframework.org/schema/context"xmlns:ehcache="http://www.springmodules.org/schema/ehcache"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsdhttp://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsdhttp://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsdhttp://www.springmodules.org/schema/ehcache http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd"><bean id="student" class="com.jack.bean.chatpter2.autowiredBeanJava.StudentXiaoMing"></bean>

<!--方式一 构造函数参数名一--><!-- <bean id="teacher" class="com.jack.bean.chatpter2.autowiredBeanJava.TeacherWang" c:student-ref="student"></bean> -->

        <!--方式二 构造函数参数的索引从0开始一-->
<!-- <bean id="teacher" class="com.jack.bean.chatpter2.autowiredBeanJava.TeacherWang" c:_0-ref="student"></bean> -->
      <!--方式三 构造函数加子标签一-->
 <bean id="teacher" class="com.jack.bean.chatpter2.autowiredBeanJava.TeacherWang"> <constructor-arg ref="student"></constructor-arg> </bean> </beans>
4.测试类
package chapter2;import org.junit.Test;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.jack.bean.chatpter2.autowiredBeanJava.Student;import com.jack.bean.chatpter2.autowiredBeanJava.TeacherWang;public class ContructorTest {Logger logger = LoggerFactory.getLogger(ContructorTest.class);@Testpublic void contructor(){ApplicationContext context = new ClassPathXmlApplicationContext("spring/chapter2/constructor.xml");TeacherWang teacher = (TeacherWang) context.getBean("teacher");Student student = teacher.getStudent();student.learn();}}

5.效果

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