spring——Spring 注入内部Bean——setter 方式注入内部 Bean-蒲公英云

我们将定义在元素的或元素内部的 Bean，称为“内部 Bean”。

项目依赖：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.example</groupId>
    <artifactId>ssw</artifactId>
    <version>1.0-SNAPSHOT</version>
    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.3.6</version>
        </dependency>
    </dependencies>
</project>

dept类：

package org.example;
public class Dept {
    //部门编号
    private String deptNo;
    //部门名称
    private String deptName;
    public void setDeptNo(String deptNo) {
        this.deptNo = deptNo;
    }
    public void setDeptName(String deptName) {
        this.deptName = deptName;
    }
    @Override
    public String toString() {
        return "Dept{" +
                "deptNo='" + deptNo + '\'' +
                ", deptName='" + deptName + '\'' +
                '}';
    }
}

employee类：

package org.example;
public class Employee {
    //员工编号
    private String empNo;
    //员工姓名
    private String empName;
    //部门信息
    private Dept dept;
    public void setEmpNo(String empNo) {
        this.empNo = empNo;
    }
    public void setEmpName(String empName) {
        this.empName = empName;
    }
    public void setDept(Dept dept) {
        this.dept = dept;
    }
    @Override
    public String toString() {
        return "Employee{" +
                "empNo='" + empNo + '\'' +
                ", empName='" + empName + '\'' +
                ", dept=" + dept +
                '}';
    }
}

bean.xml

<?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
       https://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="employee" class="org.example.Employee">
        <property  name="empNo" value="001"></property >
        <property  name="empName" value="小王"></property >
        <property  name="dept">
            <!--内部bean-->
            <bean class="org.example.Dept">
                <property name="deptNo" value="004"></property >
                <property  name="deptName" value="技术部"></property >
            </bean>
        </property >
    </bean>
</beans>

执行：

package org.example;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main
{
    private static final Log LOGGER = LogFactory.getLog(Main.class);
    public static void main(String[] args)
    {
        //获取 ApplicationContext 容器
        ApplicationContext context = new ClassPathXmlApplicationContext("bean.xml");
        //获取名为 employee 的 Bean
        Employee employee = context.getBean("employee", Employee.class);
        //通过日志打印信息
        LOGGER.info(employee.toString());
        System.out.println(employee.toString());
    }
}