PropertiesFactoryBean的使用

使用Spring注入Properies檔案方法：

 

1、src中建立一個settings.properties檔案，內容如下：

db_driverClassName=com.mysql.jdbc.Driverdb_url=jdbc:mysql://127.0.0.1/testdb_username=rootdb_password=roottest_userName=Robintest_age=18

2、在spring的applicationContext.xml中加入這段：

    <bean id="configProperties" class="org.springframework.beans.factory.config.PropertiesFactoryBean">        <property name="locations">            <list>                <value>classpath*:settings.properties</value>            </list>        </property>    </bean>    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">        <property name="ignoreResourceNotFound" value="false" />        <property name="properties" ref="configProperties" />    </bean>

之後的spring的xml配置中可以直接這樣使用了：

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">        <property name="driverClassName" value="${db_driverClassName}"/>        <property name="url" value="${db_url}" />        <property name="username" value="${db_username}" />        <property name="password" value="${db_password}" />    </bean>

3、建立一個class:Settings.java

package com.my.common;import org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Component;@Componentpublic class Settings {    private static Settings instance;    public static Settings getInstance() {        return instance;    }    public Settings() {        instance = this;    }        @Value("#{configProperties['test_userName']}")    private String userName;    @Value("#{configProperties['test_age']}")    private int age;        public String getUserName() {        return userName;    }    public void setUserName(String userName) {        this.userName = userName;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }}

然後可以在代碼中這樣調用了：

Settings.getInstance().getUserName()