Spring中利用配置文件和value注入属性值

1 简单属性值注入

package com.xy.test1;import org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Service;&＃64;Service // 需要被注入属性值的类需要被Spring管理public class PropertiesService1 { // 利用&＃64;Value注解&＃xff0c;即使没有该属性或者属性文件也不会报错  // &＃64;Value输入属性值name&＃xff0c;默认值xydefault &＃64;Value("${name:xydefault}") private String name; // &＃64;Value输入属性值num&＃xff0c;默认值-1 &＃64;Value("${num:-1}") private Integer num; // &＃64;Value输入属性值type&＃xff0c;默认值-2 &＃64;Value("${type:-2}") private Integer type; public void getInfo() {  System.out.println("name:" &＃43; name &＃43; ",num:" &＃43; num &＃43; ",type:" &＃43; type); }}

#src/main/resource新建文件info.propertiesname&＃61;xy1num&＃61;101type&＃61;1

<context:component-scan base-package&＃61;"com.xy.test1" /><bean class&＃61;"org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name&＃61;"order" value&＃61;"1" /> <property name&＃61;"locations">  <list>   <value>classpath:info/info.propertiesvalue>  list> property>bean>

package com.xy.test2;import java.util.List;import java.util.Map;import java.util.Properties;import org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Service;/** * 该类必须被Spring容器管理属性才可以被注入。利用&＃64;Value注解&＃xff0c;即使没有该属性或者属性文件也不会报错 */&＃64;Servicepublic class PropertiesService2 { &＃64;Value("#{testPro}") private Properties pros; &＃64;Value("#{testList}") private List myList; &＃64;Value("#{testMap}") private Map myMap; public Properties getPros() {  return pros; } public void setPros(Properties pros) {  this.pros &＃61; pros; } public List getMyList() {  return myList; } public void setMyList(List myList) {  this.myList &＃61; myList; } public Map getMyMap() {  return myMap; } public void setMyMap(Map myMap) {  this.myMap &＃61; myMap; }}

#src/main/resource新建文件info2.propertiesname&＃61;xy2num&＃61;102type&＃61;2

 <context:component-scan base-package&＃61;"com.xy.test2" /><util:properties id&＃61;"testPro" location&＃61;"classpath:info/info2.properties" /><util:list id&＃61;"testList" list-class&＃61;"java.util.ArrayList"> <value>firstvalue> <value>secondvalue> <value>thirdvalue>util:list><util:map id&＃61;"testMap" map-class&＃61;"java.util.HashMap"> <entry key&＃61;"1" value&＃61;"first" /> <entry key&＃61;"2" value&＃61;"second" /> <entry key&＃61;"3" value&＃61;"third" />util:map>