Java configuration read external resource configuration file

With @propertysource, you can specify the read configuration file and get the value by @value annotations, using:

 PackageCN.QLQ;ImportOrg.springframework.context.annotation.Bean;ImportOrg.springframework.context.annotation.ComponentScan;Importorg.springframework.context.annotation.Configuration;ImportOrg.springframework.context.annotation.PropertySource; @Configuration//This annotation indicates that the class is a spring configuration, which is equivalent to an XML file@ComponentScan (basepackages = "CN.QLQ")//Configuring the Scan package@PropertySource (value = {"Classpath:jdbc.properties", "xxxxx", "yyyyy"}, Ignoreresourcenotfound =true) Public classSpringconfig {@Bean//This annotation indicates that it is a bean object, which is equivalent to the <bean> in XML     PublicUserdao Getuserdao () {return NewUserdao ();//Direct New Object Demo    }}

Problem:

1. Read multiple configuration files:

2. Ignore error if file does not exist:

Open the @propertysource annotations source to see:

--------------------Configuration database Connection Pool Example-------------

Import dependency:

<!--Connection Pool -        <Dependency>            <groupId>Com.jolbox</groupId>            <Artifactid>Bonecp-spring</Artifactid>            <version>0.8.0.RELEASE</version>        </Dependency>

Before the spring XML Configuration Connection pool:

 <!--defining a data source -    <BeanID= "DataSource"class= "Com.jolbox.bonecp.BoneCPDataSource"Destroy-method= "Close">        <!--Database-driven -        < Propertyname= "Driverclass"value= "${jdbc.driverclassname}" />        <!--Jdbcurl of the corresponding drive -        < Propertyname= "Jdbcurl"value= "${jdbc.url}" />        <!--user name of the database -        < Propertyname= "username"value= "${jdbc.username}" />        <!--password for the database -        < Propertyname= "Password"value= "${jdbc.password}" />        <!--Check the time interval for idle connections in the database connection pool, in units of minutes, default: 240, set to 0 if you want to cancel -        < Propertyname= "Idleconnectiontestperiod"value= "$" />        <!--maximum surviving time for unused links in the connection pool, in units of minutes, default: 60, if you want to live forever set to 0 -        < Propertyname= "Idlemaxage"value= "+" />        <!--maximum number of connections per partition -        <!--Basis of judgment: number of concurrent requests -        < Propertyname= "Maxconnectionsperpartition"value= "+" />        <!--minimum number of connections per partition -        < Propertyname= "Minconnectionsperpartition"value= "5" />    </Bean>

The reference XML configuration is transformed into a Java configuration method:

@Value ("${jdbc.url}")    PrivateString Jdbcurl; @Value ("${jdbc.driverclassname}")    PrivateString Jdbcdriverclassname; @Value ("${jdbc.username}")    PrivateString Jdbcusername; @Value ("${jdbc.password}")    PrivateString Jdbcpassword; @Bean (Destroymethod= "Close")     PublicDataSource DataSource () {Bonecpdatasource Bonecpdatasource=NewBonecpdatasource (); //Database-drivenBonecpdatasource.setdriverclass (jdbcdriverclassname); //Jdbcurl of the corresponding driveBonecpdatasource.setjdbcurl (Jdbcurl); //user name of the databaseBonecpdatasource.setusername (jdbcusername); //password for the databaseBonecpdatasource.setpassword (jdbcusername); //Check the time interval for idle connections in the database connection pool, in units of minutes, default: 240, set to 0 if you want to cancelBonecpdatasource.setidleconnectiontestperiodinminutes (60); //maximum surviving time for unused links in the connection pool, in units of minutes, default: 60, if you want to live forever set to 0Bonecpdatasource.setidlemaxageinminutes (30); //maximum number of connections per partitionBonecpdatasource.setmaxconnectionsperpartition (100); //minimum number of connections per partitionBonecpdatasource.setminconnectionsperpartition (5); returnBonecpdatasource;}

Think: How do I use the DataSource object?

In spring, use a method similar to how you normally use it.

Java configuration read external resource configuration file