基于xml装配：
构造方法注入
1目标类
package com.itheima.f_xml.a_construct;
public class User {
private Integer uid ;
private String username ;
private Integer age ;
public User(Integer uid,String username) {
super();
this.uid = uid;
this.username = username;
}
public User(String username,Integer age) {
super();
this.username = username;
this.age = age;
}
public Integer getUid() {
return uid;
}
public void setUid(Integer uid) {
this.uid = uid;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
@Override
public String toString() {
return "User [uid=" + uid + ",username=" + username + ",age=" + age
+ "]";
}
}
2spring配置
<!-- 配置service <bean> 配置需要创建的对象 id ：用于之后从spring容器获得实例时使用的 class ：需要创建实例的全限定类名 构造方法注入： <consturctor-arg> 用于配置构造方法中一个参数argument index:参数的索引号，从0开始，如果只有索引，匹配到多个构造方法时，默认使用第一个。 type : 确定参数类型 --> <bean id="userId" class="com.itheima.f_xml.a_construct.User"> <constructor-arg index="0" type="java.lang.String" value="1"></constructor-arg> <constructor-arg index="1" type="java.lang.Integer" value="2"></constructor-arg> </bean>
3测试
package com.itheima.f_xml.a_construct;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestCon {
@Test
public void demo02(){
String xmlPath = "com/itheima/f_xml/a_construct/beans.xml";
ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlPath);
User user= (User) applicationContext.getBean("userId");
System.out.println(user);
}
}
setter方法注入
1目标类
package com.itheima.f_xml.b_setter;
public class Person {
private String name ;
private Integer age ;
private Address homeaddr ;
private Address companyaddr ;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public Address getHomeaddr() {
return homeaddr;
}
public void setHomeaddr(Address homeaddr) {
this.homeaddr = homeaddr;
}
public Address getCompanyaddr() {
return companyaddr;
}
public void setCompanyaddr(Address companyaddr) {
this.companyaddr = companyaddr;
}
@Override
public String toString() {
return "Person [name=" + name + ",age=" + age + ",homeaddr="
+ homeaddr + ",companyaddr=" + companyaddr + "]";
}
}
package com.itheima.f_xml.b_setter;
public class Address {
private String addr ;
private String tel ;
public String getAddr() {
return addr;
}
public void setAddr(String addr) {
this.addr = addr;
}
public String getTel() {
return tel;
}
public void setTel(String tel) {
this.tel = tel;
}
@Override
public String toString() {
return "Address [addr=" + addr + ",tel=" + tel + "]";
}
}
2配置
<!-- setter方法注入 property --> <bean id = "personid" class="com.itheima.f_xml.b_setter.Person"> <property name="name" value = "**"></property> <property name="age" value="27"></property> <property name="homeaddr" ref="homeAddrId"></property> <property name="companyaddr" ref="companyAddrId"></property> </bean> <bean id = "homeAddrId" class="com.itheima.f_xml.b_setter.Address"> <property name="addr" value="湖北"></property> <property name="tel" value="158"></property> </bean> <bean id="companyAddrId" class="com.itheima.f_xml.b_setter.Address"> <property name="addr" value="上海"></property> <property name="tel" value="159"></property> </bean>3测试
p命令空间方法注入
<bean id = "personid" class="com.itheima.f_xml.b_setter.Person"
p:name = "zn" p:age="27"
p:homeaddr-ref="homeAddrId"
p:companyaddr-ref= "companyAddrId">
</bean>
<bean id = "homeAddrId" class="com.itheima.f_xml.b_setter.Address"
p:addr = "湖北" p:tel = "111">
</bean>
<bean id="companyAddrId" class="com.itheima.f_xml.b_setter.Address"
p:addr = "sh" p:tel = "123">
</bean>
SpEL注入
对<property>进行统一编程，所有的内容都使用value
<!--
<property name="name" value="#{'jack'}"></property>
<property name="name" value="#{personId.name.toUpperCase()}"></property>
通过另一个bean，获得属性，调用方法
<property name="name" value="#{personId.name?.toUpperCase()}"></property>
?.如果对象不为null，将调用方法
<property name="pi" value="#{T(java.lang.Math).PI}"></property>
静态类的字段
-->
<bean id="personId" class = "com.itheima.f_xml.c_spEL.Person" >
<property name="name" value="#{personId.name?.toUpperCase()}"></property>
<property name="pi" value="#{T(java.lang.Math).PI}"></property>
</bean>
集合注入
<!-- 集合的注入都是给<property>添加子标签
数组：标签<array>
List: <list>
Set:<set>
Map:<map> map存k/v键值对，用entry
Properties: <props> <prop key="">value</prop>
普通数据： 标签<value>
引用数据：<ref>
-->
<bean id="personId" class = "com.itheima.f_xml.c_spEL.Person" >
<property name="arrayData">
<array>
<value>dd</value>
<value>dd1</value>
<value>dd2</value>
<value>dd3</value>
</array>
</property>
<property name="listData">
<list>
<value>list1</value>
<value>list2</value>
<value>list3</value>
<value>list4</value>
</list>
</property>
<property name="setData">
<set>
<value>set1</value>
<value>set2</value>
</set>
</property>
<property name="mapData">
<map>
<entry key="map" value="地图"></entry>
<entry key="jack" value="捷克"></entry>
</map>
</property>
<property name="propsData">
<props>
<prop key="高富帅">洋</prop>
<prop key="白富美">美</prop>
<prop key="屌丝">周</prop>
</props>
</property>
</bean>
