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

Java代码  

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

(2)如果加上file前缀,则表示绝对路径

Java代码  

1. ApplicationContext  applicationContext2 =  new  FileSystemXmlApplicationContext(  
2.                 "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

Java代码  

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

(2)加上classpath前缀,表示项目的classpath下相对路径

Java代码  

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

3.DEMO代码如下

Java代码  

1. public   class  Test {  
2.       
3.     public   static   void  main(String[] args) {  
4.   
5.         ApplicationContext applicationContext1 = new  FileSystemXmlApplicationContext(  
6.                 "file:E:/SpringSources/src/main/java/org/springframework/abc/demo/beans.xml" );  
7.         System.out.println(applicationContext1.getBean("person" ));  
8.   
9.         ApplicationContext applicationContext2 = new  FileSystemXmlApplicationContext(  
10.                 "src/main/java/org/springframework/abc/demo/beans.xml" );  
11.         System.out.println(applicationContext2.getBean("person" ));  
12.   
13.         ApplicationContext applicationContext3 = new  FileSystemXmlApplicationContext(  
14.                 "classpath:beans.xml" );  
15.         System.out.println(applicationContext3.getBean("person" ));  
16.   
17.         ApplicationContext applicationContext4 = new  ClassPathXmlApplicationContext(  
18.                 "beans.xml" );  
19.         System.out.println(applicationContext4.getBean("person" ));  
20.   
21.         ApplicationContext applicationContext5 = new  ClassPathXmlApplicationContext(  
22.                 "classpath:beans.xml" );  
23.         System.out.println(applicationContext5.getBean("person" ));  
24.   
25.     }  
26. }