《Pro Spring》学习笔记之使用properties文件进行依赖注入

JavaBean:

package ch2;

public class Student ... {
privateStringstuName;
privateCoursestuCourse;
publicCoursegetStuCourse()...{
returnstuCourse;
}
publicvoidsetStuCourse(CoursestuCourse)...{
this.stuCourse=stuCourse;
}
publicStringgetStuName()...{
returnstuName;
}
publicvoidsetStuName(StringstuName)...{
this.stuName=stuName;
}
}


package ch2;

public class Course ... {
privateStringcourseName;

publicStringgetCourseName()...{
returncourseName;
}

publicvoidsetCourseName(StringcourseName)...{
this.courseName=courseName;
}
}

beans.properties

#配置Course
course.class=ch2.Course
#配置Course.courseName
course.courseName = shuxue
#配置Student
student.class=ch2.Student
#配置Student引用属性stuCourse
student.stuCourse(ref)=course
#配置Student.stuName
student.stuName=gaoxiang

测试代码：

主要使用DefaultListablebeanfactory和PropertiesBeanDeFinitionReader这两个核心类

package ch2;

import java.io.File;
import java.io.FileInputStream;
import java.util.Properties;

import org.springframework.beans.factory.beanfactory;
import org.springframework.beans.factory.support.BeanDeFinitionRegistry;
import org.springframework.beans.factory.support.DefaultListablebeanfactory;
import org.springframework.beans.factory.support.PropertiesBeanDeFinitionReader;



public class TestSpring ... {
publicstaticvoidmain(Stringargs[])throwsException...{
//获取beanfactory
beanfactoryfactory=(beanfactory)getbeanfactory();
Studentstu=(Student)factory.getBean("student");//这里只获取student对象,student对象中的course对象在properties文件中进行注入
System.out.println(stu.getStuName()+"'scourseis"+stu.getStuCourse().getCourseName());

}
publicstaticBeanDeFinitionRegistrygetbeanfactory()...{
//获取beanfactory
DefaultListablebeanfactoryfactory=newDefaultListablebeanfactory();
//创建一个deFinitionreader
PropertiesBeanDeFinitionReaderrd=newPropertiesBeanDeFinitionReader(factory);

Propertiesprops=newProperties();
try...{
Stringrealpath="";
//加载配置项
realpath=System.getProperty("user.dir")+File.separator+"src"+File.separator+"ch2"+File.separator+"bean_zh_CN.properties";
props.load(newFileInputStream(realpath));
}catch(Exceptione)...{
e.printstacktrace();
returnnull;
}


rd.registerBeanDeFinitions(props);
returnfactory;
}
}

运行结果：

gaoxiang 's course is shuxue 正如我们锁期望的那样