Spring2.5-----分散配置

分散配置

在应用上下文中，使用PropertyPlaceholderConfigurer从外部属性文件装载的配置信息：

应用上下文中从当个外部外部属性文件装载配置信息:

<bean id="propertyPlaceholderConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
 <property name="location" value="cn/csdn/service/jdbc.properties"/>
   
</bean>

 
其中，location属性允许使用单个配置文件，可试用其locations属性设置配置文件列表：

<bean id="propertyPlaceholderConfigurer"
  class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
 <property name="locations">
  <list>
   <value>cn/csdn/service/jdbc.properties</value>
   <value>cn/csdn/service/security.properties</value>
   <value>cn/csdn/service/application.properties</value>
  </list>
 </property>
  
</bean>

 这样，就可用占位符变量代替Bean配置文件中硬编码配置中。语法上，占位符变量采用${variacle}的形式，如下：

ConnServiceImpl.java

package cn.csdn.service;

public class ConnServiceImpl {

 private String driverClass;
 private String url;
 private String user;
 private String password;
 
 public void setDriverClass(String driverClass) {
  this.driverClass = driverClass;
 }
 public void setUrl(String url) {
  this.url = url;
 }
 public void setUser(String user) {
  this.user = user;
 }
 public void setPassword(String password) {
  this.password = password;
 }
 public String getDriverClass() {
  return driverClass;
 }
 public String getUrl() {
  return url;
 }
 public String getUser() {
  return user;
 }
 public String getPassword() {
  return password;
 }
  
 
}

 

<bean id="connServiceImpl" class="cn.csdn.service.ConnServiceImpl"
  scope="singleton">
  <property name="driverClass">
   <value>${jdbc:driverClass}</value>
  </property>
  <property name="url">
   <value>${jdbc:url}</value>
  </property>
  <property name="user">
   <value>${jdbc:user}</value>
  </property>
  <property name="password">
   <value>${jdbc:password}</value>
  </property>
</bean>

 

jdbc.properties

jdbc\:driverClass=com.mysql.jdbc.Driver
jdbc\:url=jdbc\:mysql\://localhost\:3306/db
jdbc\:user=z_xiaofei168
jdbc\:password=root