Environment configuration for @value in Java

@value

At this stage I think everyone is not unfamiliar with annotations, @value usage is to get the configuration file information in the background, so as to facilitate the modification of some fixed configuration. Do not understand the @value Baidu can be detailed.

There are several steps to configuring the @value.

1, first create a new configuration file, System.properties

Directory structure such as

The contents are as follows

Jdbc.jdbcurl=jdbc:mysql://localhost:3306/commentdemo?useunicode=true&characterencoding

2. Configure the XML file. Is the spring configuration file, add the following content

<!--@value Annotations -<BeanID= "Configproperties"class= "Org.springframework.beans.factory.config.PropertiesFactoryBean">    < Propertyname= "Locations">        <List>            <value>Web-inf/config/system.properties</value>        </List>    </ Property></Bean><BeanID= "Propertyconfigurer"class= "Org.springframework.beans.factory.config.PreferencesPlaceholderConfigurer">    < Propertyname= "Properties"ref= "Configproperties" /></Bean>

3. Use in Controller

  @Controller @requestmapping ( "Usermanager" )   Class  Usercontroller extends   basecontroller{@Value ( "#{configproperties[' Jdbc.jdbcurl '}"  
    
     private 
      String Jdbcurl;        @Resource  private   Userdao Userdaoimpl; @RequestMapping (Value  = "/showlist"    String Showlist (model model) {SYSTEM.OUT.PRINTLN (Jdbcurl);     return  "index" 

4. See the results below

Environment configuration for @value in Java