独立的集合bean

在多个bean之间可共享该独立bean。

示例：

在其他bean中即可共享该mycars--bean。

P名空间

使用p命名空间时需要先声明使用对应的命名空间，即在beans元素上加入：

xmlns:p="http://www.springframework.org/schema/p"

使用p命名空间的好处是简化配置信息。

示例：

静态工厂注入

 

 使用的是工厂中的静态方法。

在service层引用的dao，1.可以使用原始的方式注入，2.也可以使用静态工厂注入，自己编写一个工厂类，里面静态方法返回一个dao的实现类对象。

静态工厂BinessDAOFactory：

package com.factory;import com.dao.CarDAO;import com.dao.StudentsDAO;import com.dao.impl.CarDAOImpl;import com.dao.impl.StudentsDAOImpl;public class BinessDAOFactory {        //获得学生的DAO实例    public static StudentsDAO getStudentsDAOImplInstance(){        return new StudentsDAOImpl();    }        //获得汽车的DAO实例、    public static CarDAO getCarDAOImplInstance(){        return new CarDAOImpl();    }        //获得用户的DAO实例    /*public static UsersDAO getUsersDAOImplInstance(){        return new UsersDAOImpl();    }*/}

applicationContext.xml：

         
               
          
     
      //静态方法     
                 
          
              
           
     

测试：

@Test    public void fun1(){        ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");        Students s=(Students) ctx.getBean("s");        //System.out.println(s);        StudentsServiceImpl sService=(StudentsServiceImpl) ctx.getBean("sService");        sService.add(s);    }

 

 实例工厂注入

工厂：

public class BinessDAOFactory {        //获得学生的DAO实例    public StudentsDAO getStudentsDAOImplInstance(){        return new StudentsDAOImpl();    }}

applicationContext.xml：

测试：

public class StudentServiceImplTest {    @Test    public void fun1(){        ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");        Students s=(Students) ctx.getBean("s");        //System.out.println(s);        StudentsServiceImpl sService=(StudentsServiceImpl) ctx.getBean("sService");        sService.add(s);    }}

 bean之间的依赖关系

  在Students类中加上Car car这个属性字段。

学生bean依赖汽车bean，在初始化的时候会先初始化Car。

 

bean的生命周期

 

1.懒加载，在用到该bean的时候，才会去初始化它，加载它。

Students.java：

package com.entity;import java.io.Serializable;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;import java.util.List;import javax.annotation.PostConstruct;import javax.annotation.Resource;import org.springframework.beans.factory.annotation.Value;import org.springframework.context.annotation.Bean;import org.springframework.stereotype.Component;//加注解注入，起一个别名s1@Component("haha")public class Students implements Serializable {    private String sid;// 学号    private String name;// 姓名    private String gender;// 性别    private Date birthday;// 生日    private String address;// 住址    private Car car;// 学生拥有的车的引用//    private List
     
       cars;    //初始化方法，在构造方法之后调用    public void initStudents(){        System.out.println("执行学生的initStudents()方法");    }    //在ApplicationContext对象被销毁的时候执行    public void destroyStudents(){        System.out.println("执行学生的destroyStudents()方法");    }        public Students(String sid, String name, String gender, Date birthday,            String address) {        super();        this.sid = sid;        this.name = name;        this.gender = gender;        this.birthday = birthday;        this.address = address;    }    public Students(String sid, String name, String gender, Date birthday,        String address, Car car) {    super();    this.sid = sid;    this.name = name;    this.gender = gender;    this.birthday = birthday;    this.address = address;    this.car = car;    }            public Car getCar() {        return car;    }    public void setCar(Car car) {        this.car = car;    }    public Students(String sid, String name, String gender, String address) {        this.sid = sid;        this.name = name;        this.gender = gender;        this.address = address;    }        /*//解决方法1:    //在构造方法之后执行一些初始化的操作    @PostConstruct    public void init(){        //在调用完构造函数之后，birthday还为null，然后使用这个直接赋值        try {            this.setBirthday(new SimpleDateFormat("yyyy-MM-dd").parse("2000-05-17"));        } catch (ParseException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }*/            public Students() {        System.out.println("一个学生创建啦...");    }    public String getSid() {        return sid;    }//    @Value("s0006")    public void setSid(String sid) {        this.sid = sid;    }    public String getName() {        return name;    }//    @Value("IU")    public void setName(String name) {        System.out.println("执行了setName()方法");        this.name = name;    }    public String getGender() {        return gender;    }//    @Value("女")    public void setGender(String gender) {        this.gender = gender;    }    public Date getBirthday() {        return birthday;    }//    @Value("1998-07-15")    public void setBirthday(Date birthday) {        this.birthday = birthday;    }    public String getAddress() {        return address;    }//    @Value("韩国首尔")    public void setAddress(String address) {        this.address = address;    }    @Override    public String toString() {        return "Students [sid=" + sid + ", name=" + name + ", gender=" + gender                + ", birthday=" + birthday + ", address=" + address + ", car="                + car + "]";    }}
     

applicationContext.xml：

测试：

public class StudentServiceImplTest {    @Test    public void fun1(){        ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");        Students s=(Students) ctx.getBean("s");        Students ss=(Students) ctx.getBean("s");        System.out.println(s==ss);//单例：true prototype：false        //System.out.println(s);        StudentsServiceImpl sService=(StudentsServiceImpl) ctx.getBean("sService");        sService.add(s);                ((ClassPathXmlApplicationContext)ctx).close();    }}

---

使用注解配置：

Students.java：

package com.entity;import java.io.Serializable;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;import java.util.List;import javax.annotation.PostConstruct;import javax.annotation.PreDestroy;import javax.annotation.Resource;import org.springframework.beans.factory.annotation.Value;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.DependsOn;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Component;//加注解注入，起一个别名s1@Component("s")@DependsOn(value="car")//依赖关系@Scope("prototype")//得到的bean对象是否为单例的singleton,prototypepublic class Students implements Serializable {    private String sid;// 学号    private String name;// 姓名    private String gender;// 性别    private Date birthday;// 生日    private String address;// 住址    private Car car;// 学生拥有的车的引用//    private List
     
       cars;    //初始化方法，在构造方法之后调用    @PostConstruct//初始化方法    public void initStudents(){        System.out.println("执行学生的initStudents()方法");    }        //在ApplicationContext对象被销毁的时候执行    @PreDestroy//销毁方法    public void destroyStudents(){        System.out.println("执行学生的destroyStudents()方法");    }        public Students(String sid, String name, String gender, Date birthday,            String address) {        super();        this.sid = sid;        this.name = name;        this.gender = gender;        this.birthday = birthday;        this.address = address;    }    public Students(String sid, String name, String gender, Date birthday,        String address, Car car) {    super();    this.sid = sid;    this.name = name;    this.gender = gender;    this.birthday = birthday;    this.address = address;    this.car = car;    }            public Car getCar() {        return car;    }    @Resource(name="car")    public void setCar(Car car) {        this.car = car;    }    public Students(String sid, String name, String gender, String address) {        this.sid = sid;        this.name = name;        this.gender = gender;        this.address = address;    }        /*//解决方法1:    //在构造方法之后执行一些初始化的操作    @PostConstruct    public void init(){        //在调用完构造函数之后，birthday还为null，然后使用这个直接赋值        try {            this.setBirthday(new SimpleDateFormat("yyyy-MM-dd").parse("2000-05-17"));        } catch (ParseException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }*/            public Students() {        System.out.println("一个学生创建啦...");    }    public String getSid() {        return sid;    }    @Value("s0006")    public void setSid(String sid) {        this.sid = sid;    }    public String getName() {        return name;    }    @Value("IU")    public void setName(String name) {        System.out.println("执行了setName()方法");        this.name = name;    }    public String getGender() {        return gender;    }    @Value("女")    public void setGender(String gender) {        this.gender = gender;    }    public Date getBirthday() {        return birthday;    }    @Value("1998-07-15")    public void setBirthday(Date birthday) {        this.birthday = birthday;    }    public String getAddress() {        return address;    }    @Value("韩国首尔")    public void setAddress(String address) {        this.address = address;    }    @Override    public String toString() {        return "Students [sid=" + sid + ", name=" + name + ", gender=" + gender                + ", birthday=" + birthday + ", address=" + address + ", car="                + car + "]";    }}
     

Car.java：

package com.entity;import java.io.Serializable;import org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Component;//注解注入，，之后的实例名称叫car@Component("car")public class Car implements Serializable{    private String brand;// 品牌    private String color;// 颜色    public Car() {        System.out.println("一辆汽车诞生啦...");    }    public Car(String brand, String color) {        super();        this.brand = brand;        this.color = color;    }    public String getBrand() {        return brand;    }    @Value("BMW")    public void setBrand(String brand) {        this.brand = brand;    }    public String getColor() {        return color;    }    @Value("黑色")    public void setColor(String color) {        this.color = color;    }    @Override    public String toString() {        return "Car [brand=" + brand + ", color=" + color + "]";    }}

测试：

package com.service.impl;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.AbstractApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.entity.Students;public class StudentServiceImplTest {    @Test    public void fun1(){        ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");        Students s=(Students) ctx.getBean("s");        Students ss=(Students) ctx.getBean("s");        System.out.println(s==ss);//单例：true prototype：false        //System.out.println(s);        StudentsServiceImpl sService=(StudentsServiceImpl) ctx.getBean("sService");        sService.add(s);                ((ClassPathXmlApplicationContext)ctx).close();    }}