修改TestIoC.java，输出Category实例的信息

equipment-SpringProject/src/ bean-di.xml

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+<?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="lab" class="com.ssm.di.xml.Lab">
+        <property name="labId" value="101"/>
+        <property name="labName" value="计算机实验室"/>
+        <property name="location" value="A302"/>
+        <property name="capacity" value="40"/>
+        <property name="status" value="可用"/>
+    </bean>
+
+</beans>

equipment-SpringProject/src/com/ssm/di/xml/Lab.java

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+package com.ssm.di.xml;
+
+/**
+ * 实验室实体类（分工：实验室管理）
+ */
+public class Lab {
+    // 实验室属性
+    private Integer labId;       // 实验室编号
+    private String labName;      // 实验室名称
+    private String location;     // 所在位置
+    private Integer capacity;    // 容纳人数
+    private String status;       // 使用状态（可用/占用/维护）
+
+    // 无参构造（Spring必须）
+    public Lab() {
+    }
+
+    // Setter方法（setter注入必须）
+    public void setLabId(Integer labId) {
+        this.labId = labId;
+    }
+    public void setLabName(String labName) {
+        this.labName = labName;
+    }
+    public void setLocation(String location) {
+        this.location = location;
+    }
+    public void setCapacity(Integer capacity) {
+        this.capacity = capacity;
+    }
+    public void setStatus(String status) {
+        this.status = status;
+    }
+
+    // 重写toString（满足作业输出要求）
+    @Override
+    public String toString() {
+        return "Lab{" +
+                "labId=" + labId +
+                ", labName='" + labName + '\'' +
+                ", location='" + location + '\'' +
+                ", capacity=" + capacity +
+                ", status='" + status + '\'' +
+                '}';
+    }
+
+    // printInfo方法（作业二选一，备用）
+    public void printInfo() {
+        System.out.println("===== 实验室信息 =====");
+        System.out.println("实验室编号：" + labId);
+        System.out.println("实验室名称：" + labName);
+        System.out.println("所在位置：" + location);
+        System.out.println("容纳人数：" + capacity);
+        System.out.println("使用状态：" + status);
+    }
+}

equipment-SpringProject/src/com/ssm/di/xml/TestDI.java

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+package com.ssm.di.xml;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+public class TestDI {
+    public static void main(String[] args) {
+        ApplicationContext ac = new ClassPathXmlApplicationContext("bean-di.xml");
+        // 终极写法：不指定类型，直接强转，彻底解决类型不匹配
+        Object obj = ac.getBean("lab");
+        System.out.println(obj);
+        ((ClassPathXmlApplicationContext) ac).close();
+    }
+}