一開始是想嘗試一下spring在過去的xml文件配置bean 的感覺，但是在測試 FileSystemXmlApplicationContext 的時候，反復確認文件路徑沒有問題，將 / -> \\ 也不起作用，后決定debug一下，發現根因。記錄一下，方便springboot 的新人參考。（聲明，開發我不會使用到這個方式創建 bean）

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測試代碼

package com.example.show_bean;import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;public class ApplicationContextTest {public static void main(String[] args) {testFileSystemXmlApplicationContext();}/*** 基于磁盤路徑的 xml 配置文件來創建*/private static void testFileSystemXmlApplicationContext() {FileSystemXmlApplicationContext context = new FileSystemXmlApplicationContext("/Users/xx/project/java/easy_spring_mvc/learn_spring/show_bean/src/test/resources/b01.xml");System.out.println(context.getBean(Bean2.class).getBean1());}/*** java 配置類來創建*/private static void testAnnotationConfigApplicationContext() {}public static class Bean1 {Bean1() {System.out.println(">>>>>>>>>> 1");}}public static class Bean2 {private Bean1 bean1;public Bean2() {System.out.println(">>>>>>>>>>>> 2.");}public void setBean1(Bean1 bean1) {this.bean1 = bean1;}public Bean1 getBean1() {return bean1;}}}

<?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="bean1" class="com.example.show_bean.ApplicationContextTest.Bean1"/><bean id="bean2" class="com.example.show_bean.ApplicationContextTest.Bean2"><property name="bean1" ref="bean1"/></bean></beans>

文件🌲

運行結果

Exception in thread “main” org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from file [/Users/xx/project/java/easy_spring_mvc/learn_spring/Users/csjerry/project/java/easy_spring_mvc/learn_spring/show_bean/src/test/resources/b01.xml]; nested exception is java.io.FileNotFoundException: Users/xx/project/java/easy_spring_mvc/learn_spring/show_bean/src/test/resources/b01.xml
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:342)
at com.example.show_bean.ApplicationContextTest.main(ApplicationContextTest.java:10)
Caused by: java.io.FileNotFoundException: Users/csjerry/project/java/easy_spring_mvc/learn_spring/show_bean/src/test/resources/b01.xml
at org.springframework.core.io.FileSystemResource.getInputStream(FileSystemResource.java:189)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:333)

debug

原因
在 FileSystemXmlApplicationContext 中傳入路徑，如果是'/' 開頭會被截掉一個，導致路徑不全。

解決方案

簡單粗暴多加一個 /