《Pro Spring》学习笔记之使用properties文件进行依赖注入

发布时间：2020-05-23 02:15:43 所属栏目：程序设计来源：互联网

导读：JavaBean: package ch2; public class Student ... { privateStringstuName; privateCoursestuCourse; publicCoursegetStuCourse()...{ returnstuCourse; } publicvoidsetStuCourse(Course

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

（编辑：安卓应用网）

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