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"
));

    }
}