本篇文章为大家展示了如何解决spring无法读取properties文件数据问题,内容简明扼要并且容易理解,绝对能使你眼前一亮,通过这篇文章的详细介绍希望你能有所收获。
controller中注入的@Value配置是从servlet-context.xml配置文件中获取的;service中注入的@Value配置可以从applicationContext.xml中获取的。所以,如果要在controller中注入属性配置,需要在相应servlet文件中添加配置,同applicationContext.xml中一样。
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <list> <value>classpath:jdbc.properties</value> <value>classpath:config.properties</value> </list> </property> <property name="ignoreUnresolvablePlaceholders" value="true"/></bean>
查看配置文件是否有多个。如果配置的路径是classpath:config.properties, 鼠标点击文件。如果显示”multiple implementations”, 表示有多个文件,查看其他的文件中是否有需要的配置项,没有的话,很可能就是加载了其他文件的配置项。这时,将路径改为classpath*:config.properties即可。
<context:property-placeholder ignore-unresolvable="true" location="classpath:/jdbc.properties, classpath*:/config.properties"/>
查看日志,发现:
[2017-01-05 16:45:02 INFO ] [main] (org.springframework.context.support.PropertySourcesPlaceholderConfigurer:?) - Loading properties file from URL [jar:file:/home/admin/creative-task/lib/xxxx-common-1.5.7.jar!/config.properties][2017-01-05 16:45:02 INFO ] [main] (org.springframework.context.support.PropertySourcesPlaceholderConfigurer:?) - Loading properties file from URL 下载地址
加载了两个config.properties文件。
1)首先确认是否正确加载了配置文件。查看日志:
正常日志如下:
[2017-01-05 16:45:02 INFO ] [main] (org.springframework.context.support.PropertySourcesPlaceholderConfigurer:?) - Loading properties file from URL 下载地址
异常日志如下:
[2017-01-05 16:39:39 ERROR] [main] (Main:22) - Could not load properties; nested exception is java.io.FileNotFoundException: class path resource [config.properties] cannot be opened because it does not existorg.springframework.beans.factory.BeanInitializationException: Could not load properties; nested exception is java.io.FileNotFoundException: class path resource [config.properties] cannot be opened because it does not exist
如果文件没有加载,则查看路径是否匹配等。
2)如果文件加载ok,查看配置属性是否正确加载。
查看tomcat启动的debug日志:
正常日志如下:
[2017-01-05 16:45:04 DEBUG] [main] (org.springframework.core.env.PropertySourcesPropertyResolver:?) - Searching for key 'adx.id' in [environmentProperties][2017-01-05 16:45:04 DEBUG] [main] (org.springframework.core.env.PropertySourcesPropertyResolver:?) - Searching for key 'adx.id' in [systemProperties][2017-01-05 16:45:04 DEBUG] [main] (org.springframework.core.env.PropertySourcesPropertyResolver:?) - Searching for key 'adx.id' in [systemEnvironment][2017-01-05 16:45:04 DEBUG] [main] (org.springframework.core.env.PropertySourcesPropertyResolver:?) - Could not find key 'adx.id' in any property source. Returning [null][2017-01-05 16:45:04 DEBUG] [main] (org.springframework.core.env.PropertySourcesPropertyResolver:?) - Searching for key 'adx.id' in [localProperties][2017-01-05 16:45:04 DEBUG] [main] (org.springframework.core.env.PropertySourcesPropertyResolver:?) - Found key 'adx.id' in [localProperties] with type [String] and value '1'
异常日志如下:
[2017-01-05 16:34:01 DEBUG] [main] (org.springframework.core.env.PropertySourcesPropertyResolver:?) - Searching for key 'adx.id' in [environmentProperties][2017-01-05 16:34:01 DEBUG] [main] (org.springframework.core.env.PropertySourcesPropertyResolver:?) - Searching for key 'adx.id' in [systemProperties][2017-01-05 16:34:01 DEBUG] [main] (org.springframework.core.env.PropertySourcesPropertyResolver:?) - Searching for key 'adx.id' in [systemEnvironment][2017-01-05 16:34:01 DEBUG] [main] (org.springframework.core.env.PropertySourcesPropertyResolver:?) - Could not find key 'adx.id' in any property source. Returning [null][2017-01-05 16:34:01 DEBUG] [main] (org.springframework.core.env.PropertySourcesPropertyResolver:?) - Searching for key 'adx.id' in [localProperties][2017-01-05 16:34:01 DEBUG] [main] (org.springframework.core.env.PropertySourcesPropertyResolver:?) - Could not find key 'adx.id' in any property source. Returning [null]
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