1 简单属性值注入
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package com.xy.test1; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Service; @Service // 需要被注入属性值的类需要被Spring管理 public class PropertiesService1 { // 利用@Value注解,即使没有该属性或者属性文件也不会报错 // @Value输入属性值name,默认值xydefault @Value ( "${name:xydefault}" ) private String name; // @Value输入属性值num,默认值-1 @Value ( "${num:-1}" ) private Integer num; // @Value输入属性值type,默认值-2 @Value ( "${type:-2}" ) private Integer type; public void getInfo() { System.out.println( "name:" + name + ",num:" + num + ",type:" + type); } } |
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#src/main/resource新建文件info.properties name=xy1 num=101 type=1 |
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<!-- applicationContext.xml文件 --> <!-- 扫描测试属性包中的类,要注入属性类需要被Spring管理 --> < context:component-scan base-package = "com.xy.test1" /> <!--方法1--> <!-- <context:property-placeholder location="classpath*:info/info.properties" /> --> <!--方法2--> < bean class = "org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" > < property name = "locations" > < list > < value >classpath:info/info.properties</ value > </ list > </ property > </ bean > |
2 利用util标签注入复杂属性值
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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@Value注解,即使没有该属性或者属性文件也不会报错 */ @Service public class PropertiesService2 { @Value ( "#{testPro}" ) private Properties pros; @Value ( "#{testList}" ) private List<String> myList; @Value ( "#{testMap}" ) private Map<Integer, String> myMap; public Properties getPros() { return pros; } public void setPros(Properties pros) { this .pros = pros; } public List<String> getMyList() { return myList; } public void setMyList(List<String> myList) { this .myList = myList; } public Map<Integer, String> getMyMap() { return myMap; } public void setMyMap(Map<Integer, String> myMap) { this .myMap = myMap; } } |
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#src/main/resource新建文件info2.properties name=xy2 num=102 type=2 |
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<!-- applicationContext.xml --> <!-- 扫描测试属性包中的类,要注入属性类需要被Spring管理 --> < context:component-scan base-package = "com.xy.test2" /> <!-- properties --> < util:properties id = "testPro" location = "classpath:info/info2.properties" /> <!-- list --> < util:list id = "testList" list-class = "java.util.ArrayList" > < value >first</ value > < value >second</ value > < value >third</ value > </ util:list > <!-- map --> < util:map id = "testMap" map-class = "java.util.HashMap" > < entry key = "1" value = "first" /> < entry key = "2" value = "second" /> < entry key = "3" value = "third" /> </ util:map > |
总结
以上就是本文关于Spring中利用配置文件和@value注入属性值代码详解的全部内容,希望对大家有所帮助。有什么问题可以随时留言,小编会及时回复大家的。
原文链接:http://blog.csdn.net/woshixuye/article/details/54999993