问题描述
使用XML批注,我正在使用以下配置注入地图-
Using XML annotation , I am injecting a map using the below config -
<bean id = "customerfactory" class = "com.brightstar.CustomerFactory">
<property name = "getCustomerMap">
<map key-type = "java.lang.String" value-type = "com.brightstar.CustomerImpl">
<entry key = "DEFAULT" value-ref = "getDefaultImpl"></entry>
<entry key = "PERSON" value-ref = "getPersonImpl"></entry>
<entry key = "COMPANY" value-ref = "getCompanyImpl"></entry>
</map>
</property>
</bean>
我创建了3个bean-DefaultImpl,PersonImpl和CompanyImpl.如何使用Spring Annotation将它们作为地图注入?
I have created 3 beans - DefaultImpl , PersonImpl and CompanyImpl. How can I inject these as a map using Spring Annotation?
目前,我已经执行了以下操作,但不确定是否建议这样做
For now , I have performed the below but not sure if it is the recommended approach
private Map<String, CustomerImpl> getCustomerMap ;
@Autowired
private GetDefaultImpl getDefaultImpl;
@Autowired
private GetPersonImpl getPersonImpl;
@Autowired
private GetCompanyImpl getCompanyImpl;
private static final String DEFAULT = "DEFAULT";
private static final String COM = "PERSON";
private static final String SOM = "COMPANY";
@PostConstruct
public void init(){
getCustomerMap = new LinkedHashMap<String,CustomerImpl>();
getCustomerMap.put(DEFAULT, getDefaultImpl);
getCustomerMap.put(PERSON, getPersonImpl);
getCustomerMap.put(COMPANY, getCompanyImpl);
}
推荐答案
1.插入一个包含对象的 Map ,(使用Java Config )
1.Inject a Map which contains Objects, (Using Java Config)
您可以这样做...
@Configuration
public class MyConfiguration {
@Autowired private WhiteColourHandler whiteColourHandler;
@Bean public Map<ColourEnum, ColourHandler> colourHandlers() {
Map<ColourEnum, ColourHandler> map = new EnumMap<>();
map.put(WHITE, whiteColourHandler);
//put more objects into this map here
return map;
}
}
===================
====================
2.插入一个包含字符串的映射(使用属性文件)
2.Inject a Map which contains Strings (Using properties file)
您可以使用 @Value 批注和 SpEL 从属性文件将字符串值注入到Map中.
You can inject String values into a Map from the properties file using the @Value annotation and SpEL like this.
例如,在属性文件中的属性下方.
For example, below property in the properties file.
propertyname={key1:'value1',key2:'value2',....}
在您的代码中,
@Value("#{${propertyname}}")
private Map<String,String> propertyname;
注意:1.#标签作为注释的一部分.
Note: 1.The hashtag as part of the annotation.
2.Values must be quotes, else you will get SpelEvaluationException
这篇关于弹簧注释-注入对象图的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!