文章目录

一 IOC容器
- 1.1 Bean管理-XML方式
- - 创建对象
  - 注入属性
  - - set注入属性
    - 有参构造注入属性
    - p名称空间注入属性
    - 注入特殊类型属性
    - - 注入内部Bean
      - 级联赋值
      - 第一种
        第二种
- 1.2 Bean管理-注解方式
- - 创建对象
  - 注入属性
  - - @Autowired 根据属性进行注入
    - @Qualifier 根据名称进行注入
  - 完全注解开发
  - - 创建配置类：
    - 编写测试类

一 IOC容器

1.1 Bean管理-XML方式

创建对象

注入属性

set注入属性

有参构造注入属性

p名称空间注入属性

注入特殊类型属性

注入内部Bean

在这里插入图片描述
Dept.java

package com.jh.spring5.bean;
//部门类
public class Dept {
    //部门名称
    private String dname;
    public void setDname(String dname) {
        this.dname = dname;
    }
    @Override
    public String toString() {
        return "Dept{" +
                "dname='" + dname + '\'' +
                '}';
    }
}

Emp.java

package com.jh.spring5.bean;
//员工类
public class Emp {
    //员工名字
    private String ename;
    //员工性别
    private String gender;
    //员工所属部门
    private Dept dept;
    public void setEname(String ename) {
        this.ename = ename;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public void setDept(Dept dept) {
        this.dept = dept;
    }
    public void add(){
        System.out.println(ename+","+gender+","+dept);
    }
}

bean1.xml

<bean id="emp" class="com.jh.spring5.bean.emp">
        <property name="ename" value="lucy"></property>
        <property name="gender" value="女"></property>
        <property name="dept">
            <bean id="deot" class="com.jh.spring5.bean.Dept">
                <property name="dname" value="安保部"></property>
            </bean>
        </property>
    </bean>

测试

@Test
    public void testbean(){
        ApplicationContext context =
                new ClassPathXmlApplicationContext("bean1.xml");
        Emp emp = context.getBean("emp",Emp.class);
        emp.add();
    }

级联赋值

第一种

测试

<bean id="emp" class="com.jh.spring5.bean.Emp">
        <property name="ename" value="lucy"></property>
        <property name="gender" value="女"></property>
        <property name="dept" ref="dept"></property>
    </bean>
    <bean name="dept" class="com.jh.spring5.bean.Dept">
        <property name="dname" value="保安lll部"></property>
    </bean>

第二种

Emp.java

public Dept getDept() {
        return dept;
    }

测试

<bean id="emp" class="com.jh.spring5.bean.Emp">
        <property name="ename" value="lucy"></property>
        <property name="gender" value="女"></property>
        <property name="dept" ref="dept"></property>
        <property name="dept.dname" value="技pppp术部"></property>
    </bean>
    <bean name="dept" class="com.jh.spring5.bean.Dept">
        <property name="dname" value="保安lll部"></property>
    </bean>

1.2 Bean管理-注解方式

创建对象

package com.jh.spring5.service;
import com.jh.spring5.dao.UserDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class UserService {
    public void add(){
        System.out.println("service add.......");
    }
}
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
    <context:component-scan base-package="com.jh">
    </context:component-scan>
</beans>
@Test
    public void test(){
        ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
        UserService userService = context.getBean("userService",UserService.class);
        System.out.println(userService);
        userService.add();
    }

注入属性

列子：在service里注入dao对象

@Autowired 根据属性进行注入

新建 UserDaoImpl .java

package com.jh.spring5.dao;
import org.springframework.stereotype.Repository;
@Repository
public class UserDaoImpl implements UserDao {
    @Override
    public void add() {
        System.out.println("userdaoimpl.....");
    }
}

UserService.java里加上

@Service
public class UserService {
    @Autowired
    private UserDao userDao;
    public void add(){
        userDao.add();
        System.out.println("service add.......");
    }
}

@Qualifier 根据名称进行注入

原因：一个接口可能会有多个实现类
1.新建 userDaoImpl2.java

@Repository
public class UserDaoImpl2 implements UserDao {
    @Override
    public void add() {
        System.out.println("userdaoimpl2.....");
    }
}

2.UserService.java
@Qualifier(value = “userDaoImpl”)注入userDaoImpl.java里的属性
@Qualifier(value = “userDaoImpl2”)注入userDaoImpl2.java里的属性

@Service
public class UserService {
    @Autowired
    @Qualifier(value = "userDaoImpl2")
    private UserDao userDao;
    public void add(){
        userDao.add();
        System.out.println("service add.......");
    }
}

完全注解开发

创建配置类：

代替xml文件

@Configurable

开启组件扫描

@ComponentScan(basePackages = {"com.jh.spring5"})
@Configurable
@ComponentScan(basePackages = {
    "com.jh.spring5"})
public class SpringConfig {
}

编写测试类

ApplicationContext context = new AnnotationConfigApplicationContext(SpringConfig.class);
public class StuTest {
    @Test
    public void test(){
        ApplicationContext context = new AnnotationConfigApplicationContext(SpringConfig.class);
        UserService userService = context.getBean("userService",UserService.class);
        System.out.println(userService);
        userService.add();
    }
}