Spring依赖注入

1、构造方法注入

类中提供构造方法

bean.xml中通过constructor-arg为构造方法的参数赋值

2、setter方法注入

类中提供setter方法

bean.xml中通过property标签配置注入

3、集合的注入方式

类中提供setter方法

package com.alphajuns.webstudy.pojo;
 
import java.util.*;
 
public class CollectionDI {
 
    private String[] strArray;
    private List<String> list;
    private Set<String> set;
    private Map<String, String> map;
    private Properties properties;
 
    public void setStrArray(String[] strArray) {
        this.strArray = strArray;
    }
 
    public void setList(List<String> list) {
        this.list = list;
    }
 
    public void setSet(Set<String> set) {
        this.set = set;
    }
 
    public void setMap(Map<String, String> map) {
        this.map = map;
    }
 
    public void setProperties(Properties properties) {
        this.properties = properties;
    }
 
    @Override
    public String toString() {
        return "CollectionDI{" +
                "strArray=" + Arrays.toString(strArray) +
                ", list=" + list +
                ", set=" + set +
                ", map=" + map +
                ", properties=" + properties +
                '}';
    }
}

bean.xml中配置

<!-- 集合注入 -->
    <bean id="CollectionDI" class="com.alphajuns.webstudy.pojo.CollectionDI">
        <!-- 数组 -->
        <property name="strArray">
            <set>
                <value>AAA</value>
                <value>BBB</value>
                <value>CCC</value>
            </set>
        </property>
        <!-- list -->
        <property name="list">
            <array>
                <value>DDD</value>
                <value>EEE</value>
                <value>FFF</value>
            </array>
        </property>
        <property name="set">
            <list>
                <value>111</value>
                <value>222</value>
                <value>111</value>
            </list>
        </property>
        <property name="map">
            <props>
                <prop key="a">AAA</prop>
                <prop key="b">BBB</prop>
            </props>
        </property>
        <property name="properties">
            <map>
                <entry key="d" value="DDD"></entry>
                <entry key="e">
                    <value>EEE</value>
                </entry>
            </map>
        </property>
    </bean>