spring中加载Bean配置文件的惯用方式

spring中加载Bean配置文件的常用方式
Spring中加载Bean配置文件的常用方式有两种,一种是通过实例化FileSystemXmlApplicationContext类的方式加载Bean,
另一种是通过实例化ClassPathXmlApplicationContext类的方式加载Bean.现举例如下,已做记录.

1.FileSystemXmlApplicationContext

(1)默认从项目工作路径开始查找,是相对路径

ApplicationContext applicationContext1 = new FileSystemXmlApplicationContext("src/main/java/org/springframework/abc/demo/beans.xml");

(2)如果加上file前缀,则表示绝对路径

ApplicationContext  applicationContext2 = new FileSystemXmlApplicationContext("file:E:/SpringSources/src/main/java/org/springframework/abc/demo/beans.xml");

2.ClassPathXmlApplicationContext

(1)没有前缀,默认为项目的classpath下相对路径

ApplicationContext applicationContext3 = new ClassPathXmlApplicationContext("beans.xml");

(2)加上classpath前缀,表示项目的classpath下相对路径

ApplicationContext applicationContext4 = new ClassPathXmlApplicationContext("classpath:beans.xml");

3.DEMO代码如下

public class Test {public static void main(String[] args) {ApplicationContext applicationContext1 = new FileSystemXmlApplicationContext("file:E:/SpringSources/src/main/java/org/springframework/abc/demo/beans.xml");System.out.println(applicationContext1.getBean("person"));ApplicationContext applicationContext2 = new FileSystemXmlApplicationContext("src/main/java/org/springframework/abc/demo/beans.xml");System.out.println(applicationContext2.getBean("person"));ApplicationContext applicationContext3 = new FileSystemXmlApplicationContext("classpath:beans.xml");System.out.println(applicationContext3.getBean("person"));ApplicationContext applicationContext4 = new ClassPathXmlApplicationContext("beans.xml");System.out.println(applicationContext4.getBean("person"));ApplicationContext applicationContext5 = new ClassPathXmlApplicationContext("classpath:beans.xml");System.out.println(applicationContext5.getBean("person"));}}

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