Spring4 根据类型自动装配属性类型为java.util.Properties
问题描述
1.配置文件:
<bean id="person4" class=".." autowire="byType" />
<util:properties id="propertiesReader" location="classpath:yuan.properties" />
2.相关代码
public class Person{
private Properties props;
@Value("#{propertiesReader[username}")
public void setProps(Properties props) {
this.props = props;
}
//..
}
3.尝试解决的方案:
1.<util:properties id="propertiesReader" location="classpath:test.properties" />
2、在类中需要注入的属性实现 setter 和 getter 方法。
3、在 setter 方法前,添加 @Value 注解
@Value ("#{propertiesReader[propertiesName]}")
propertiesName 为 properties 文件中的键。这样,在容器启动过程中, Spring 将自动注入值。
4.异常信息(说找到2个.properties 文件):org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'person4' defined in class path resource [beans.xml]: Unsatisfied dependency expressed through bean property 'props': : No qualifying bean of type [java.util.Properties] is defined: expected single matching bean but found 2: propertiesReader,systemProperties; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [java.util.Properties] is defined: expected single matching bean but found 2: propertiesReader,systemProperties
5.控制台:
信息: Loading properties file from class path resource [yuan.properties](从类路径资源加载属性文件[yuan.properties])
不需要 get set 方法
@Value("#{propertiesReader}")
public Properties props;
@Value("#{propertiesReader['username']}")
public String username;
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