典型的SPRING IOC 配置代码片段,如何自己使用反射实现见JAVA代码;
<bean id="javabean" class="com.sunshine.test.TestReflect">
<property name="field1" value="test" />
<property name="otherField1" value="AAAA" />
</bean>
package com.sunshine.test; import java.lang.reflect.Method; import java.util.HashMap; import java.util.Map; public class TestReflect { private String field1; private String field2; @Override public String toString() { return "TestReflect [field1=" + field1 + ", field2=" + field2 + "]"; } /** * @param args * @throws Exception * * <bean id="javabean" class="com.sunshine.test.TestReflect"> * <property name="field1" value="test" /> * <property name="otherField1" value="AAAA" /> * </bean> */ public static void main(String[] args) throws Exception { Map<String, Object> context = new HashMap<String, Object>(); String className = TestReflect.class.getName(); String property1 = "field1"; System.out.println("spring 中配置的类名:" + className); // ----------1.模拟SPRING 利用配置的class 来创建对象实例 Class clazz = Class.forName(className); Object object = clazz.newInstance(); if (object instanceof TestReflect) { System.out.println("spring 调用默认构造函数后产生实例:" + object); } // ---------2.模拟SPRING 利用配置的property 来进行属性赋值-- Method logMethod = clazz.getDeclaredMethod("set" + "F" + "ield1", String.class); logMethod.invoke(object, "test"); System.out.println("spring 实例 的属性赋值后:" + object); // ---------3.正确理解SPRING属性赋值,其实是调用set方法[set+属性(注意需要大写第一个字母后]来赋值 -- String property2 = "otherField1"; logMethod = clazz.getDeclaredMethod("set" + "O" + "therField1", String.class); logMethod.invoke(object, "AAAA"); System.out.println("spring 实例 的属性赋值后:" + object); // ----------4.模拟SPRING 容器-------------- context.put("javabean", object); // ---------5 .模拟SPRING 容器取对象----- Object newObject = context.get("javabean"); System.out.println("spring 取对象:" + newObject); } public String getField1() { return field1; } public void setField1(String field1) { this.field1 = field1; } public void setOtherField1(String field) { this.field2 = field; } }