依赖注入之集合注入

╰半夏微凉° 2022-11-25 00:55 235阅读 0赞

## Set注入 ##

##### 要求被注入的属性，在对应的类中必须有set方法 #####

##### 案例放分析： #####

#### 实体类 ####

public class address { 
        private String address;
    
        public void setAddress(String address) { 
            this.address = address;
        }
    
        public String getAddress() { 
            return address;
        }
    }
    public class student { 
        private String name;
        private address address;
        private String[]book;
        private List<String> hobby;
        private Map<String,String>idCard;
        private Set<String>games;
        private Properties properties;
    
        public void setName(String name) { 
            this.name = name;
        }
    
        public void setAddress(cn.com.Ycy.spring.domain.address address) { 
            this.address = address;
        }
    
        public void setBook(String[] book) { 
            this.book = book;
        }
    
        public void setHobby(List<String> hobby) { 
            this.hobby = hobby;
        }
    
        public void setIdCard(Map<String, String> idCard) { 
            this.idCard = idCard;
        }
    
        public void setGames(Set<String> games) { 
            this.games = games;
        }
    
        public void setProperties(Properties properties) { 
            this.properties = properties;
        }
    
        @Override
        public String toString() { 
            return "student{" +
                    "name='" + name + '\'' +
                    ", address=" + address.getAddress() +
                    ", book=" + Arrays.toString(book) +
                    ", hobby=" + hobby +
                    ", idCard=" + idCard +
                    ", games=" + games +
                    ", properties=" + properties +
                    '}';
        }
    }

### 注入分类 ###

#### 1、常量注入 ####

### 2、引用类型注入 ###

### 3、数组注入 ###

<property name="book">
       <array>
    	    <value>java开发手册</value>
    	    <value>python入门到精通</value>
    	    <value>围城</value>
    	    <value>斗罗大陆</value>
       </array>
    </property>

### 4、List 注入 ###

### 5、set 注入 ###

### 6、Map注入 ###

##### 和Java的Map一样，key对应键值 #####

### 7、Properties 注入 ###

##### 这个就等同于 #####

学号=20201147  
高数A=68  
java=88

#### ApplicationContext.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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
        <bean id="student" class="cn.com.Ycy.spring.domain.student">
            <property name="name" value="张三"/>
    
            <property name="address" ref="address"/>
            <property name="book">
                <array>
                    <value>java开发手册</value>
                    <value>python入门到精通</value>
                    <value>围城</value>
                    <value>斗罗大陆</value>
                </array>
            </property>
            <property name="hobby">
                <list>
                    <value>看书</value>
                    <value>听歌</value>
                    <value>写代码</value>
                    <value>看动漫</value>
                </list>
            </property>
            <property name="idCard">
                <map>
                    <entry key="身份证" value="123455666"/>
                    <entry key="学号" value="2020704"/>
                </map>
            </property>
            <property name="games">
                <set>
                    <value>王者荣耀</value>
                    <value>LOL</value>
                </set>
            </property>
            <property name="properties">
                <props>
                    <prop key="学号">20201147</prop>
                    <prop key="高数A">68</prop>
                    <prop key="java">88</prop>
                </props>
            </property>
        </bean>
        <bean id="address" class="cn.com.Ycy.spring.domain.address">
            <property name="address" value="北京"/>
        </bean>
    
    </beans>

#### 测试代码： ####

@Test
        public void test02(){ 
            ApplicationContext ac = new ClassPathXmlApplicationContext("ApplicationContext.xml");
            student student = (cn.com.Ycy.spring.domain.student) ac.getBean("student");
            System.out.println(student);
        }

#### 输出结果： ####

student{ name='张三', address=北京, 
    book=[java开发手册, python入门到精通, 围城, 斗罗大陆], 
    hobby=[看书, 听歌, 写代码, 看动漫], 
    idCard={ 身份证=123455666, 学号=2020704}, 
    games=[王者荣耀, LOL], 
    properties={ java=88, 高数A=68, 学号=20201147}
    }