Spring依赖注入之复杂类型的注入

1）List、Set、Map、Properties集合注入

实体类

public class User {
    private List<String> hobit;
    private Set<String> subject;
    private Map<String,Double> score;
    private Properties db;

    public User() {
    }

    public User(List<String> hobit, Set<String> subject, Map<String, Double> score, Properties db) {
        this.hobit = hobit;
        this.subject = subject;
        this.score = score;
        this.db = db;
    }

    public List<String> getHobit() {
        return hobit;
    }

    public void setHobit(List<String> hobit) {
        this.hobit = hobit;
    }

    public Set<String> getSubject() {
        return subject;
    }

    public void setSubject(Set<String> subject) {
        this.subject = subject;
    }

    public Map<String, Double> getScore() {
        return score;
    }

    public void setScore(Map<String, Double> score) {
        this.score = score;
    }

    public Properties getDb() {
        return db;
    }

    public void setDb(Properties db) {
        this.db = db;
    }

    @Override
    public String toString() {
        return "User{" +
                "hobit=" + hobit +
                ", subject=" + subject +
                ", score=" + score +
                ", db=" + db +
                '}';
    }
}

数据库配置文件（db.properties）

driverClassName = com.mysql.jdbc.Driver
url = jdbc:mysql://localhost:3306/eesy
username = root
password = root

配置文件（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"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
       http://www.springframework.org/schema/util
       http://www.springframework.org/schema/util/spring-util-4.0.xsd">

    <!-- 加载数据库信息 -->
    <util:properties id="db" location="classpath:db.properties"></util:properties>

    <bean id="user" class="entity.User">
        <property name="hobit">
            <list>
                <value>电影</value>
                <value>音乐</value>
                <value>阅读</value>
                <value>阅读</value>
            </list>
        </property>

        <property name="subject">
            <set>
                <value>Chinese</value>
                <value>Math</value>
                <value>English</value>
                <value>English</value>
            </set>
        </property>

        <property name="score">
            <map>
                <entry key="Chinese" value="80"></entry>
                <entry key="Math" value="85"></entry>
                <entry key="Math" value="86"></entry>
                <entry key="English" value="90"></entry>
            </map>
        </property>

        <property name="db" ref="db"></property>
    </bean>
</beans>

测试类

public class TestDI {
    @Test
    public void test() {
        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
        User user = ac.getBean("user", User.class);
        System.out.println(user);
    }
}

测试结果

User{hobit=[电影, 音乐, 阅读, 阅读], subject=[Chinese, Math, English], score={Chinese=80.0, Math=86.0, English=90.0}, db={password=root, url=jdbc:mysql://localhost:3306/eesy, driverClassName=com.mysql.jdbc.Driver, username=root}}

2）引用的方式注入集合

实体类

public class User {
    private List<String> hobit;
    private Set<String> subject;
    private Map<String,Double> score;
    private Properties db;

    public User() {
    }

    public User(List<String> hobit, Set<String> subject, Map<String, Double> score, Properties db) {
        this.hobit = hobit;
        this.subject = subject;
        this.score = score;
        this.db = db;
    }

    public List<String> getHobit() {
        return hobit;
    }

    public void setHobit(List<String> hobit) {
        this.hobit = hobit;
    }

    public Set<String> getSubject() {
        return subject;
    }

    public void setSubject(Set<String> subject) {
        this.subject = subject;
    }

    public Map<String, Double> getScore() {
        return score;
    }

    public void setScore(Map<String, Double> score) {
        this.score = score;
    }

    public Properties getDb() {
        return db;
    }

    public void setDb(Properties db) {
        this.db = db;
    }

    @Override
    public String toString() {
        return "User{" +
                "hobit=" + hobit +
                ", subject=" + subject +
                ", score=" + score +
                ", db=" + db +
                '}';
    }
}

数据库配置文件（db.properties）

driverClassName = com.mysql.jdbc.Driver
url = jdbc:mysql://localhost:3306/eesy
username = root
password = root

配置文件（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"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
       http://www.springframework.org/schema/util
       http://www.springframework.org/schema/util/spring-util-4.0.xsd">

        <util:list id="hobitBean">
            <value>电影</value>
            <value>音乐</value>
            <value>阅读</value>
            <value>阅读</value>
        </util:list>

        <util:set id="subjectBean">
            <value>Chinese</value>
            <value>Math</value>
            <value>English</value>
            <value>English</value>
        </util:set>

        <util:map id="scoreBean">
            <entry key="Chinese" value="80"></entry>
            <entry key="Math" value="85"></entry>
            <entry key="Math" value="86"></entry>
            <entry key="English" value="90"></entry>
        </util:map>

        <util:properties id="dbBean">
            <prop key="username">scott</prop>
            <prop key="password">tiger</prop>
        </util:properties>

        <!-- 加载数据库信息 -->
        <util:properties id="dbBean" location="classpath:db.properties"></util:properties>

        <!-- 注册User类 -->
        <bean id="user" class="entity.User">
            <property name="hobit" ref="hobitBean"></property>
            <property name="subject" ref="subjectBean"></property>
            <property name="score" ref="scoreBean"></property>
            <property name="db" ref="dbBean"></property>
        </bean>
</beans>

测试类

public class TestDI {
    @Test
    public void test() {
        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
        User user = ac.getBean("user", User.class);
        System.out.println(user);
    }
}

测试结果

User{hobit=[电影, 音乐, 阅读, 阅读], subject=[Chinese, Math, English], score={Chinese=80.0, Math=86.0, English=90.0}, db={password=root, url=jdbc:mysql://localhost:3306/eesy, driverClassName=com.mysql.jdbc.Driver, username=root}}