Spring5注入对象属性

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深漂小码哥 2021-12-04 19:02:48 ©著作权

文章标签 spring java postman xml 赋值 文章分类 代码人生

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1.方法注入属性

（1）类

package com.leo.spring5;

public class Book {

    private String name;
    private String author;

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

    public void setAuthor(String author) {
        this.author = author;
    }

    public void testDemo() {
        System.out.println("name:" + name + ", author：" + author);
    }
}

（2）XML

<?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:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!--set 方法注入属性-->
    <bean id="book" class = "com.leo.spring5.Book">
          <!--<property name="name" value="天龙八部"></property>-->
        <!--属性中特殊字符处理，CDATA-->
        <property name="name">
            <value><![CDATA[《天龙八部》]]></value>
        </property>
        <property name="author" value="金庸"></property>
    </bean>
</beans>

（3）测试

package com.leo.spring5.testdemo;

import com.leo.spring5.Book;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestSpring5 {

    @Test
    public void testBook1() {
        ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
        Book book = context.getBean("book", Book.class);
        System.out.println(book);
        book.testDemo();
    }
}

（4）执行

Spring5注入对象属性_spring

2.构造参数注入属性

（1）类

package com.leo.spring5;

public class Orders {
    private String name;
    private String address;

    public Orders(String name, String address) {
        this.name = name;
        this.address = address;
    }

    public void testDemo() {
        System.out.println("name：" + name + ", address： " + address);
    }
}

（2）XML

<?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:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!--有参数构造注入属性-->
    <bean id ="orders" class = "com.leo.spring5.Orders">
        <constructor-arg name="name" value="order name"></constructor-arg>
        <constructor-arg name="address" value="china"></constructor-arg>
    </bean>
</beans>

（3）测试

package com.leo.spring5.testdemo;

import com.leo.spring5.Orders;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestSpring5 {


    @Test
    public void testOrders() {
        ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
        Orders orders = context.getBean("orders", Orders.class);
        System.out.println(orders);
        orders.testDemo();
    }
}

（4）执行

Spring5注入对象属性_xml_02

3.外部bean

（1）创建dao类

package com.leo.spring5.dao;

public interface UserDao {
    public void update();
}

package com.leo.spring5.dao;

public class UserDaoImpl implements UserDao{
    @Override
    public void update() {
        System.out.println("dao update");
    }
}

（2）在service调用dao里面的方法

package com.leo.spring5.service;

import com.leo.spring5.dao.UserDao;

public class UserService {

    private UserDao userDao;

    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }

    public void add() {
        System.out.println("service add");
        userDao.update();
    }
}

（3）在spring配置文件中进行配置

<?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:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!--service和dao对象创建-->
    <bean id="userService" class="com.leo.spring5.service.UserService">
        <!--注入userDao对象
            name：为类里面属性名称
            ref: 创建userDao对象bean标签的id值
        -->
        <property name="userDao" ref="userDaoImpl"></property>
    </bean>
    <bean id="userDaoImpl" class="com.leo.spring5.dao.UserDaoImpl"></bean>
</beans>

（4）测试

package com.leo.spring5.testdemo;

import com.leo.spring5.service.UserService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestBean {

    @Test
    public void testAdd() {
        // 1.加载spring配置文件
        ApplicationContext context = new ClassPathXmlApplicationContext("bean2.xml");
        // 2.获取配置创建的对象
        UserService userService = context.getBean("userService", UserService.class);
        System.out.println(userService);
        userService.add();
    }

}

（5）执行

Spring5注入对象属性_xml_03

4.内部Bean和级联赋值

一对多的关系：部门跟员工

（1）类

package com.leo.spring5.bean;

public class Dept {
    private String name;

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

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

package com.leo.spring5.bean;

// 员工类
public class Emp {

    private String name;
    private String gender;

    // 员工属于某一部门，使用对象进行表示
    private Dept dept;

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

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

    public void setDept(Dept dept) {
        this.dept = dept;
    }

    public void add() {
        System.out.println("name：" + name + ", dept：" + dept);
    }
}

（2）XML

<?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:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="emp" class="com.leo.spring5.bean.Emp">
        <!--设置两个普通属性-->
        <property name="name" value="leo"></property>
        <property name="gender" value="male"></property>
        <!--设置对象类型属性-->
        <property name="dept">
            <bean id="dept" class="com.leo.spring5.bean.Dept">
                <property name="name" value="IT Department"></property>
            </bean>
        </property>
    </bean>
</beans>

或

<?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:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="emp" class="com.leo.spring5.bean.Emp">
        <!--设置两个普通属性-->
        <property name="name" value="leo"></property>
        <property name="gender" value="male"></property>
        <!--级联赋值-->
        <property name="dept" ref="dept"></property>
    </bean>
    <bean id="dept" class="com.leo.spring5.bean.Dept">
        <property name="name" value="研发部"></property>
    </bean>
</beans>

（3）测试

package com.leo.spring5.testdemo;

import com.leo.spring5.bean.Emp;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestBean {

    @Test
    public void testBean() {
        ApplicationContext context = new ClassPathXmlApplicationContext("bean3.xml");
        Emp emp = context.getBean("emp", Emp.class);
        emp.add();
    }
}

Spring5注入对象属性_xml_04

package com.leo.spring5.testdemo;

import com.leo.spring5.bean.Emp;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestBean {


    @Test
    public void testBean() {
        ApplicationContext context = new ClassPathXmlApplicationContext("bean4.xml");
        Emp emp = context.getBean("emp", Emp.class);
        emp.add();
    }
}

Spring5注入对象属性_postman_05 Spring5注入对象属性_java_06