1.1 属性依赖注入
依赖注入方式:手动装配 和 自动装配
手动装配:一般进行配置信息都采用手动
基于xml装配:构造方法、setter方法
基于注解装配:
自动装配:struts和spring 整合可以自动装配
byType:按类型装配
byName:按名称装配
constructor:构造装配,
auto: 不确定装配。
一.构造方法注入
User.java
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; } }
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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <!-- 构造方法注入 * <constructor-arg> 用于配置构造方法一个参数argument name :参数的名称 value:设置普通数据 ref:引用数据,一般是另一个bean id值 index :参数的索引号,从0开始 。如果只有索引,匹配到了多个构造方法时,默认使用第一个。 type :确定参数类型 例如:使用名称name <constructor-arg name="username" value="jack"></constructor-arg> <constructor-arg name="age" value="18"></constructor-arg> 例如2:【类型type 和 索引 index】 <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 id="userId" class="com.itheima.f_xml.a_constructor.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> </beans>
二.property属性注入
User.java
package com.zk.myspring; public class User { private Integer uid; private String username; private Integer age; public Integer getUid() { return uid; } public void setUid(Integer uid) { this.uid = uid; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } @Override public String toString() { return "User [uid=" + uid + ", username=" + username + ", age=" + age + "]"; } public User(Integer uid, String username, Integer age) { super(); this.uid = uid; this.username = username; this.age = age; } public User() { super(); } }
Test.java
package com.zk.myspring; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Test { public static void main(String[]args) { String path="/com/zk/myspring/ApplicationContext.xml"; ApplicationContext ac=new ClassPathXmlApplicationContext(path); User user=(User) ac.getBean("UserId"); System.out.println(user); } }
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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="UserId" class="com.zk.myspring.User"> <!-- setter方法注入: 普通数据: <property name="" value="值"> 等效 <property name=""> <value> 值 </value> </property> 引用数据 <property name="" ref="另一个bean"> </property> 等效 <property name=""> <ref bean="" /> </property> --> <property name="username" value="jack"></property> <property name="uid" value="1"></property> <property name="age" value="24"></property> <!-- p命名空间,对setter方法注入进行简化,替换<property name="属性名">,而是在<bean 属性名="普通值"> --> </bean> </beans>
ApplicationContext的p命名空间
<?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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="UserId" class="com.zk.myspring.User" p:uid="1" p:age="24" p:username="zk" p:company-ref="company1"></bean> <bean id="company1" class="com.zk.myspring.Company" p:name="computer science" p:address="徐州市中国矿业大学计算机科学与技术学院"> </bean> </beans>
三.集合属性注入
CollData.java
package com.zk.myspringcoll; import java.util.Arrays; import java.util.List; import java.util.Map; import java.util.Properties; import java.util.Set; public class CollData { private String[] arrayData; private List<String> listData; private Set<String> setData; private Map<String,String> mapData; private Properties propersData; public String[] getArrayData() { return arrayData; } public void setArrayData(String[] arrayData) { this.arrayData = arrayData; } public List<String> getListData() { return listData; } public void setListData(List<String> listData) { this.listData = listData; } public Set<String> getSetData() { return setData; } public void setSetData(Set<String> setData) { this.setData = setData; } public Map<String, String> getMapData() { return mapData; } public void setMapData(Map<String, String> mapData) { this.mapData = mapData; } public Properties getPropersData() { return propersData; } public void setPropersData(Properties propersData) { this.propersData = propersData; } @Override public String toString() { return "CollData [arrayData=" + Arrays.toString(arrayData) + ", \nlistData=" + listData + ", \nsetData=" + setData + ", \nmapData=" + mapData + ", \nproperties=" + propersData + "]"; } }
Test.java
package com.zk.myspringcoll; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class TestColl { public static void main(String[]args) { ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml"); CollData colldata=(CollData) ac.getBean("CollData"); System.out.println(colldata); } }
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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <!-- 集合注入都是给<property>添加子标签 数组:<array> List:<List> Set:<set> Map:<map> Properties:<props><prop key="">value</prop></props> 普通数据:<value> 引用数据:<ref> --> <bean id="CollData" class="com.zk.myspringcoll.CollData"> <property name="arrayData"> <array> <value>DS</value> <value>DZD</value> <value>屌丝</value> <value>吊中吊</value> </array> </property> <property name="listData"> <list> <value>list1</value> <value>list2</value> <value>list3</value> <value>list4</value> <value>list5</value> </list> </property> <property name="setData"> <set> <value>set1</value> <value>set2</value> <value>set3</value> <value>set4</value> <value>set5</value> </set> </property> <property name="mapData"> <map> <entry key="1" value="value1"></entry> <entry key="2" value="value2"></entry> <entry key="3" value="value3"></entry> <entry key="4" value="value4"></entry> <entry key="5" value="value5"></entry> <!-- <entry> <key><value>6</value></key> <value>value6</value> </entry> --> </map> </property> <property name="propersData"> <props> <prop key="高富帅">嫐</prop> <prop key="白富美">嬲</prop> <prop key="屌丝">挊</prop> </props> </property> </bean> </beans>
四.自动装配bean
<?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-2.5.xsd"> <!-- 自动装配(用的不多): byName按名称自动匹配(即要装配的bean中的属性名称和配置中的bean名称相同就会自动装配,如UserService类中的属性和userDAO的bean名称相同就自动装配) byType按类型自动匹配 (即要装配的bean中的属性类型和配置中的bean的类型相同就会自动装配,如UserService类中的属性类型和userDAO的bean类型相同就自动装配) --> <bean id="user" class="com.zk.myspring.User" autowire="default"> </bean> </beans>
五.使用注解
<?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:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"> <context:annotation-config></context:annotation-config> </beans>
六.扫描包名
<?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:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"> <context:component-scan base-package="com.bjsxt"></context:component-scan> </beans>
原文地址:https://www.cnblogs.com/longlyseul/p/10011172.html
时间: 2024-10-28 07:57:48