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Enum 注入

注入 Enum 可以使用字符串直接注入,或者借助 org.springframework.beans.factory.config.FieldRetrievingFactoryBean,下面以注入 FastJson 的 SerializerFeature 和自定义 enum 为例.

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package com.alibaba.fastjson.serializer;
public enum SerializerFeature {
QuoteFieldNames,
UseSingleQuotes,
WriteMapNullValue,
WriteEnumUsingToString,
WriteEnumUsingName,
...
}
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public enum Color {
RED, GREEN, BLUE
}

enum.xml

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<?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.xsd">
<bean id="quoteFieldNames" class="org.springframework.beans.factory.config.FieldRetrievingFactoryBean">
<property name="staticField" value="com.alibaba.fastjson.serializer.SerializerFeature.QuoteFieldNames" />
</bean>
<bean id="injectEnum" class="InjectEnum">
<property name="color" value="RED"/>
<property name="features">
<list> <!--表示是 list-->
<ref bean="quoteFieldNames"/>
<value>UseSingleQuotes</value>
</list>
</property>
</bean>
</beans>

InjectEnum.java

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import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;
import lombok.Getter;
import lombok.Setter;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
@Getter
@Setter
public class InjectEnum {
private SerializerFeature features[];
private Color color;
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("enum.xml");
InjectEnum obj = context.getBean("injectEnum", InjectEnum.class);
System.out.println(JSON.toJSONString(obj));
}
}

输出:

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{"color":"RED","features":["QuoteFieldNames","UseSingleQuotes"]}