Spring Ioc小练习

1、创建一个教师类，包含属性name和addr，通过xml文件配置方式，为属性赋值，并使用java反射机制，创建类的对象，并使用Method，调用类的setXXX方法，为属性赋值。

 

2、创建一个StudentService类，其中需要使用StudentDao接口的保存方法，来存储一个Student类的对象，StudentDao接口有两个不同的实现类，通过Spring的方式，为Student类创建对象并为属性赋值，并通过Spring的方式，创建StudentService类的对象以及StudentDao接口的一个实现类对象，将两个对象的依赖关系在spring容器中注入，并模拟完成保存的操作

 

 

package com.xzit.model;

public class Teacher {
    private String name;
    private String addr;
    private Student student;

    public Student getStudent() {
        return student;
    }

    public void setStudent(Student student) {
        this.student = student;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddr() {
        return addr;
    }

    public void setAddr(String addr) {
        this.addr = addr;
    }

    public String isGuide(){
        System.out.println(name+"在指导"+student.getName()+"学习java");
        String var1 = name+"在指导"+student.getName()+"学习java";
        return var1;
    }

    @Override
    public String toString() {
        return "Teacher{" +
                "name='" + name + '\'' +
                ", addr='" + addr + '\'' +
                '}';
    }
}

 

package com.xzit.util;

import com.xzit.model.Teacher;

public class test1 {
    public static void main(String[] args) {
        Teacher teacher = (Teacher) XmlBeanFactory.getBean("C:\\JavaProject\\idea_Workspace\\springFramework\\day_01_job\\src\\main\\resources\\bean.xml"
        ,"teacher");
        System.out.println(teacher);
    }
}

package com.xzit.model;

public class Student {
    private String name;
    private String gender;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", gender='" + gender + '\'' +
                '}';
    }
}

package com.xzit.util;

public interface StudentDao {
    void save(String var1);
}

package com.xzit.util;

public class StudentService implements StudentDao{
    @Override
    public void save(String var1) {
        System.out.println("数据库保存了："+var1);
    }
}

package com.xzit.util;

import com.xzit.model.Student;
import com.xzit.model.Teacher;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class test2 {
    public static void main(String[] args) {
        //加载spring容器
        ApplicationContext ctx = new ClassPathXmlApplicationContext("bean.xml");
        Student student = (Student) ctx.getBean("student");
        Teacher teacher = (Teacher) ctx.getBean("teacher");
        String guide = teacher.isGuide();
        StudentDao studentDao = (StudentDao) ctx.getBean("studentDao");
        studentDao.save(guide);
        /*student.setName("琪琪");
        student.setGender("女");
        System.out.println(student);*/
    }
}

package com.xzit.util;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.util.List;

public class XmlBeanFactory {
    public static Object getBean(String fileName,String key){
        SAXReader reader=new SAXReader();
        try {
            Document doc = reader.read(fileName);
            Element root = doc.getRootElement();//获取根元素
            List<Element> beans = root.elements("bean");//获取下面所有的bean元素
            for (Element bean : beans){
                if (key.contentEquals(bean.attributeValue("id"))){
                    String clazz=bean.attributeValue("class");
                    Class<?> aClass = Class.forName(clazz);//加载类，获得字节码
                    List<Element> properties = bean.elements("property");//取下面所有属性配置
                    Object obj = aClass.getConstructor().newInstance();//构造对象
                    for (Element property:properties){
                        //获取属性名并给属性赋值
                        String propertyName = property.attributeValue("name");
                        Field field = aClass.getDeclaredField(propertyName);
                        field.setAccessible(true);
                        field.set(obj,property.attributeValue("value"));
                    }
                    return obj;
                }
            }
        } catch (DocumentException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }
        return null;
    }
}