Spring的ApplicationContext.xml中使用properties文件中的属性初始化bean

1、src/main/resources中新建mysql.jdbc.properties，名字自己取好供后面引用，内容如下：

basicDatasource.driverClassName=com.mysql.jdbc.Driver

basicDatasource.url=jdbc:mysql://127.0.0.1:3306/XX?characterEncoding=UTF-8

basicDatasource.username=root

basicDatasource.password=XXXXXXXX

说明：属性对的key"."前面（红色部分）必须是要初始化的bean的id，在spring的xml文件中配置。"."后面的部分（蓝色部分）为该bean中接收值的属性。

2、接收properties文件属性值的java类定义

package kent.exercise.spring.dao.model;

public class Datasource {

private String driverClassName;

private String url;

private String username;

private String password;

public String getUrl() {

return url;

}

public void setUrl(String url) {

this.url = url;

}

public String getDriverClassName() {

return driverClassName;

}

public void setDriverClassName(String driverClassName) {

this.driverClassName = driverClassName;

}

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;

}

}

3、spring配置文件services.xml（自己取名字）中定义JavaBean，生命该javaBean属性由properties文件中配置好的属性对初始化

<bean id="basicDatasource" class="kent.exercise.spring.dao.model.Datasource">

<property name="driverClassName" value="${basicDatasource.driverClassName}"></property>

<property name="url" value="${basicDatasource.url}"></property>

<property name="username" value="${basicDatasource.username}"></property>

<property name="password" value="${basicDatasource.password}"></property>

</bean>

其中蓝字部分和红字部分 命名全文应保持一致。

4、声明properties文件路径，交给spring读取并初始化

<bean id="propertyConfigure" class="org.springframework.beans.factory.config.PropertyOverrideConfigurer">

<property name="locations">

<list>

<value>mysql.jdbc.properties</value>

</list>

</property>

</bean>