创建对象和set注入属性

DI：注入属性

通过set注入属性

xml配置文件

    <bean id="book" class="com.su.spring5.Book">
        <!--使用property完成属性注入
            name:类里面的属性名称
            value向属性注入的值
        -->
        <property name="bname" value="易筋经"></property>
        <property name="bauthor" value="达摩老祖"></property>

    </bean>

测试类

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

    }

通过有参构造注入：

<!--    有参构造注入-->
    <bean id="order" class="com.su.spring5.Orders">

        <constructor-arg name="oname" value="电脑"></constructor-arg>
        <constructor-arg name="address" value="China"></constructor-arg>
    </bean>

p名称空间注入

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



<bean id="book" class="com.su.spring5.Book" p:bname="九阳神功" p:bauthor="无名氏">
        <!--<property name="bname" value="易筋经"></property>
        <property name="bauthor" value="达摩老祖"></property>-->

</bean>

注入空值和特殊符号

<bean id="book" class="com.su.spring5.Book">
        <property name="bname" value="易筋经"></property>
        <property name="bauthor" value="达摩老祖"></property>
        <property name="bprice">
            <null></null>  <!--注入空值-->
        </property>
    </bean>

<bean id="book" class="com.su.spring5.Book">
        <!--
            1.进行转义

            2.把特殊符号内容写到CDATA
        -->
        <property name="bname" >
            <value><![CDATA[<<易筋经>>]]></value>
        </property>
        <property name="bauthor" value="达摩老祖"></property>
        <property name="bprice" value="100"></property>
    </bean>

注入外部bean

创建两个类service和dao类
在service调用dao里面的方法

UserDao

public interface UserDao {
    public void update();
}

UserImpl

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

UserService

import com.su.spring5.dao.UserDao;

public class UserService {

    private UserDao userDao;

    public UserDao getUserDao() {
        return userDao;
    }

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

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

    <bean id="userDaoImpl" class="com.su.spring5.dao.UserImpl"></bean>
    <bean id="userService" class="com.su.spring5.service.UserService">
        <!--
            注入userDao对象
            name:类属性
            ref:创建userDao对象bean标签id值
        -->
        <property name="userDao" ref="userDaoImpl">
        </property>
    </bean>

    @Test
    public void TestService(){
        ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
        UserService userService = context.getBean("userService", UserService.class);
        userService.add();
    }

内部bean和级联赋值

一对多的关系
一个部门有多个员工，一个员工属于一个部门

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

级联赋值

一开始和外部bean注入步骤是一致的。

<bean id="emp" class="com.su.spring5.bean.Emp">
        <property name="ename" value="Allen"></property>
        <property name="gender" value="男"></property>
        <property name="dept" ref="dept"></property>
        <property name="dept.dname" value="技术部"></property>
    </bean>
    <bean id="dept" class="com.su.spring5.bean.Dept"></bean>

注入集合属性

注入数组类型的属性
注入List集合类型
注入Map集合类型

package com.su.spring5.bean;

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class Student {
    private String[] courses;
    private List<String> list;
    private Map<String,Integer> map;
    private Set<String> set;

    public Student() {
    }

    public Student(String[] courses, List<String> list, Map<String, Integer> map, Set<String> set) {
        this.courses = courses;
        this.list = list;
        this.map = map;
        this.set = set;
    }

    public String[] getCourses() {
        return courses;
    }

    public void setCourses(String[] courses) {
        this.courses = courses;
    }

    public List<String> getList() {
        return list;
    }

    public void setList(List<String> list) {
        this.list = list;
    }

    public Map<String, Integer> getMap() {
        return map;
    }

    public void setMap(Map<String, Integer> map) {
        this.map = map;
    }

    public Set<String> getSet() {
        return set;
    }

    public void setSet(Set<String> set) {
        this.set = set;
    }

    @Override
    public String toString() {
        return "Student{" +
                "courses=" + Arrays.toString(courses) +
                ", list=" + list +
                ", map=" + map +
                ", set=" + set +
                '}';
    }
}

    <bean id="student" class="com.su.spring5.bean.Student">
        <!--数组类型的属性注入-->
        <property name="courses">
            <array>
                <value>数学</value>
                <value>英语</value>
                <value>语文</value>
            </array>
        </property>
        <!--集合类型的属性注入-->
        <property name="list">
            <list>
                <value>Java</value>
                <value>C++</value>
                <value>Python</value>
            </list>
        </property>
        <property name="map">
            <map>
                <entry key="html" value="89"></entry>
                <entry key="c++" value="92"></entry>
                <entry key="js" value="76"></entry>
            </map>
        </property>
        <property name="set">
            <set>
                <value>mysql</value>
                <value>sql server</value>
                <value>rdius</value>
            </set>
        </property>
    </bean>