Spring提供注解@PropertySource来加载属性文件，该注解包含的配置项有：
name：字符串，配置这次属性配置的名称。value：字符串数组，可以配置多个属性文件。ignoreResourceNotFound：boolean值，默认为false，其含义为如果找不到对应的属性文件是否进行忽略处理，由于默认值为false，所以在默认的情况下找不到对应的配置文件会抛出异常。encoding：编码，默认为””。注意： 如果只有@PropertySource的加载，Spring只会把对应文件加载进来，而没有解析属性占位符的能力。S任凭推荐使用一个属性文件解析类进行处理，即PropertySourcesPlaceholderconfigurer，使用它就意味着允许Spring解析对应的属性文件，并通过占位符去引用对应的配置。
（1）属性文件database-config.properties：
jdbc.database.driver=com.mysql.jdbc.Driver jdbc.database.url=jdbc:mysql://localhost:3306/chapter10 jdbc.database.username=root jdbc.database.password=123456（2）使用@PropertySource注解加载数据库属性文件
package com.ssm.chapter10.annotation.config; import java.util.Properties; import javax.sql.DataSource; import org.apache.commons.dbcp.BasicDataSourceFactory; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.ComponentScan.Filter; import org.springframework.context.annotation.Conditional; import org.springframework.context.annotation.FilterType; import org.springframework.context.annotation.PropertySource; import org.springframework.context.support.PropertySourcesPlaceholderConfigurer; @ComponentScan(basePackageClasses = { Role.class, RoleServiceImpl.class }, excludeFilters = {@Filter(type = FilterType.REGEX, pattern="com.ssm.chapter10.annotation.config.AutowiredConfig")}) @PropertySource(value={"classpath:database-config.properties"}, ignoreResourceNotFound=true) public class ApplicationConfig { @Bean public PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() { return new PropertySourcesPlaceholderConfigurer(); } }（3）在Bean中引入属性文件的配置
package com.ssm.chapter10.annotation.config; import java.util.Properties; import javax.sql.DataSource; import org.apache.commons.dbcp.BasicDataSourceFactory; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.stereotype.Component; @Component public class DataSourceBean { @Value("${jdbc.database.driver}") private String driver = null; @Value("${jdbc.database.url}") private String url = null; @Value("${jdbc.database.username}") private String username = null; @Value("${jdbc.database.password}") private String password = null; public String getDriver() { return driver; } public void setDriver(String driver) { this.driver = driver; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } @Bean(name = "dataSource1") public DataSource getDataSource() { Properties props = new Properties(); props.setProperty("driver", driver); props.setProperty("url", url); props.setProperty("username", username); props.setProperty("password", password); DataSource dataSource = null; try { dataSource = BasicDataSourceFactory.createDataSource(props); } catch (Exception e) { e.printStackTrace(); } return dataSource; } }