Spring——依赖注入类型

以例子说明：

一、新建Student类，声明各属性，创建成JavaBean：

package spring;

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

public class Student {
    private int sid;
    private String sname;
    private String sex;
    private StuClass stuClass;
    
    private Set course;
    private Set<StuClass> classSet;
    
    private Map C2S;
    
    private List score;
    private List<StuClass> classList;
    
    private Properties properties;

    public int getSid() {
        return sid;
    }

    public void setSid(int sid) {
        this.sid = sid;
    }

    public String getSname() {
        return sname;
    }

    public void setSname(String sname) {
        this.sname = sname;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public StuClass getStuClass() {
        return stuClass;
    }

    public void setStuClass(StuClass stuClass) {
        this.stuClass = stuClass;
    }

    public Set getCourse() {
        return course;
    }

    public void setCourse(Set course) {
        this.course = course;
    }

    public Set<StuClass> getClassSet() {
        return classSet;
    }

    public void setClassSet(Set<StuClass> classSet) {
        this.classSet = classSet;
    }

    public Map getC2S() {
        return C2S;
    }

    public void setC2S(Map c2s) {
        C2S = c2s;
    }

    public List getScore() {
        return score;
    }

    public void setScore(List score) {
        this.score = score;
    }

    public List<StuClass> getClassList() {
        return classList;
    }

    public void setClassList(List<StuClass> classList) {
        this.classList = classList;
    }

    public Properties getProperties() {
        
        Set<Object> keys = properties.keySet();
        for (Object key : keys) {
            String value = properties.getProperty((String)key);
            System.out.println("getProperties():" + key + " = "+value);
        }
        
        return properties;
    }

    public void setProperties(Properties properties) {
        this.properties = properties;
    }

    @Override
    public String toString() {
        return "Student [sid=" + sid + ", sname=" + sname + ", sex=" + sex + ", stuClass=" + stuClass + ", course="
                + course + ", classSet=" + classSet + ", C2S=" + C2S + ", score=" + score + ", classList=" + classList
                + ", properties=" + properties + "]";
    }
}

二、在xml文件中采取依赖注入的方式动态赋值：

<!-- 班级bean............开始 -->
    <bean id="class1" class="spring.StuClass">
        <property name="cid" value="1000"></property>
        <property name="cname" value="JAVA"></property>
    </bean>
    
    <bean id="class2" class="spring.StuClass">
        <property name="cid" value="2000"></property>
        <property name="cname" value="C#"></property>
    </bean>
    
    <bean id="class3" class="spring.StuClass">
        <property name="cid" value="3000"></property>
        <property name="cname" value="C++"></property>
    </bean>
    <!-- 班级bean............结束 -->
    
    <!-- 学生bean -->
    <bean id="zhangsan" class="spring.Student">
        <!-- 基本类型注入 -->
        <property name="sid" value="001"></property>
        <!-- <property name="sid"><value>001</value></property> -->
        
        <!-- null类型注入 -->
        <property name="sname">
            <!-- <value>null</value>  字符串 -->
            <null></null><!-- null类型 -->
        </property>
        
        <!-- ""空字符串注入 -->
        <property name="sex">
            <value></value>
        </property>
        
        <!-- 引用类型注入 -->
        <property name="stuClass">
            <ref bean="class1"></ref>
        </property>
        
        <!-- set集合注入:无序无重复 -->
        <property name="course">
            <set>
                <value>java</value>
                <value>php</value>
                <value>c#</value>
                <value>vb</value>
                <value>c++</value>
                <value>java</value><!-- 重复值 -->
            </set>
        </property>
        <property name="classSet">
            <set>
                <ref bean="class1"/>
                <ref bean="class2"/>
                <ref bean="class3"/>
            </set>
        </property>
        <!-- Map集合注入 -->
        <property name="C2S">
            <map>
                <entry key="java" value="90"></entry>
                <entry key="C#" value="99"></entry>
                <entry key="C++" value="100"></entry>
            </map>
        </property>
        <!-- list集合注入：有序有重复 -->
        <property name="score">
            <list>
                <value>77</value>
                <value>88</value>
                <value>99</value>
            </list>
        </property>
        <property name="classList">
            <list>
                <ref bean="class1"/>
                <ref bean="class2"/>
                <ref bean="class3"/>
            </list>
        </property>
        <!-- Properties注入 -->
        <property name="properties">
            <props>
                <prop key="username">tomcat</prop>
                <prop key="password">123456</prop>
            </props>
        </property>
    </bean>