最近開發(fā)的項目使用了SpringMVC的框架,用下來感覺SpringMVC的代碼實現(xiàn)的非常優(yōu)雅,功能也非常強大,
網(wǎng)上介紹Controller參數(shù)綁定、URL映射的文章都很多了,寫這篇博客主要總結一下SpringMVC加載配置Properties文件的幾種方式
1.通過context:property-placeholde實現(xiàn)配置文件加載
1.1、在spring.xml中加入context相關引用
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<? xml version = "1.0" encoding = "UTF-8" ?> < beans xmlns = "http://www.springframework.org/schema/beans" xmlns:context = "http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> |
1.2、引入jdbc配置文件
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< context:property-placeholder location = "classpath:jdbc.properties" /> |
1.3、jdbc.properties的配置如下
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jdbc_driverClassName=com.mysql.jdbc.Driver jdbc_url=jdbc:mysql: //localhost/testdb?useUnicode=true&characterEncoding=utf8 jdbc_username=root jdbc_password= 123456 |
1.4、在spring-mybatis.xml中引用jdbc中的配置
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< bean id = "dataSource" class = "com.alibaba.druid.pool.DruidDataSource" init-method = "init" destroy-method = "close" > < property name = "driverClassName" > < value >${jdbc_driverClassName}</ value > </ property > < property name = "url" > < value >${jdbc_url}</ value > </ property > < property name = "username" > < value >${jdbc_username}</ value > </ property > < property name = "password" > < value >${jdbc_password}</ value > </ property > <!-- 連接池最大使用連接數(shù) --> < property name = "maxActive" > < value >20</ value > </ property > <!-- 初始化連接大小 --> < property name = "initialSize" > < value >1</ value > </ property > <!-- 獲取連接最大等待時間 --> < property name = "maxWait" > < value >60000</ value > </ property > <!-- 連接池最大空閑 --> < property name = "maxIdle" > < value >20</ value > </ property > <!-- 連接池最小空閑 --> < property name = "minIdle" > < value >3</ value > </ property > <!-- 自動清除無用連接 --> < property name = "removeAbandoned" > < value >true</ value > </ property > <!-- 清除無用連接的等待時間 --> < property name = "removeAbandonedTimeout" > < value >180</ value > </ property > <!-- 連接屬性 --> < property name = "connectionProperties" > < value >clientEncoding=UTF-8</ value > </ property > </ bean > |
1.5、在Java類中引用jdbc.properties中的配置
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import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Configuration; @Configuration public class JdbcConfig{ @Value ( "${jdbc_url}" ) public String jdbcUrl; //這里變量不能定義成static @Value ( "${jdbc_username}" ) public String username; @Value ( "${jdbc_password}" ) public String password; } |
1.6、在controller中調(diào)用
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@RequestMapping ( "/service/**" ) @Controller public class JdbcController{ @Autowired private JdbcConfig Config; //引用統(tǒng)一的參數(shù)配置類 @Value ( "${jdbc_url}" ) private String jdbcUrl; //直接在Controller引用 @RequestMapping (value={ "/test" }) public ModelMap test(ModelMap modelMap) { modelMap.put( "jdbcUrl" , Config.jdbcUrl); return modelMap; } @RequestMapping (value={ "/test2" }) public ModelMap test2(ModelMap modelMap) { modelMap.put( "jdbcUrl" , this .jdbcUrl); return modelMap; } } |
1.7、測試
在ie中輸入http://localhost:8080/testWeb/service/test 或http://localhost:8080/testWeb/service/test2
返回如下結果:
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{ jdbcUrl:"jdbc:mysql://localhost/testdb?useUnicode=true&characterEncoding=utf8" } |
注:通過context:property-placeholde加載多個配置文件
只需在第1.2步中將多個配置文件以逗號分隔即可
<context:property-placeholder location="classpath:jdbc.properties,classpath:XXX.properties"/>
2、通過util:properties實現(xiàn)配置文件加載
2.1、在spring.xml中加入util相關引用
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<? xml version = "1.0" encoding = "UTF-8" ?> < beans xmlns = "http://www.springframework.org/schema/beans" xmlns:context = "http://www.springframework.org/schema/context" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xmlns:util = "http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd"> |
2.2、 引入config配置文件
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< util:properties id = "settings" location = "classpath:config.properties" /> |
2.3、config.properties的配置如下
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gnss.server.url=http://127.0.0.1:8080/gnss/services/data-world/rest |
2.4、在java類中引用config中的配置
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import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; @Component public class Config { @Value ( "#{settings['gnss.server.url']}" ) public String GNSS_SERVER_URL; } |
2.5、在controller中調(diào)用
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@RequestMapping ( "/service2/**" ) @Controller public class ConfigController{ @Autowired private Config Config; //引用統(tǒng)一的參數(shù)配置類 @RequestMapping (value={ "/test" }) public ModelMap test(ModelMap modelMap) { modelMap.put( "gnss.service.url" ,Config.GNSS_SERVER_URL); return modelMap; } } |
2.6、測試
在ie中輸入http://localhost:8080/testWeb/service2/test
返回如下結果:
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{ "gnss.service.url":"http://127.0.0.1:8080/gnss/services/data-world/rest" } |
3.直接在Java類中通過注解實現(xiàn)配置文件加載
3.1、在java類中引入配置文件
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import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.PropertySource; @Configuration @PropertySource (value= "classpath:config.properties" ) public class Config { @Value ( "${gnss.server.url}" ) public String GNSS_SERVER_URL; @Value ( "${gnss.server.url}" ) public String jdbcUrl; } 3.2 、在controller中調(diào)用 @RequestMapping ( "/service2/**" ) @Controller public class ConfigController{ @Autowired private Config Config; //引用統(tǒng)一的參數(shù)配置類 @RequestMapping (value={ "/test" }) public ModelMap test(ModelMap modelMap) { modelMap.put( "gnss.service.url" , Config.GNSS_SERVER_URL); return modelMap; } } |
3.3、測試
在ie中輸入http://localhost:8080/testWeb/service2/test
返回如下結果:
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{ "gnss.service.url":"http://127.0.0.1:8080/gnss/services/data-world/rest" } |
最后附上spring.xml的完整配置:
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<? xml version = "1.0" encoding = "UTF-8" ?> < beans xmlns = "http://www.springframework.org/schema/beans" xmlns:context = "http://www.springframework.org/schema/context" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xmlns:util = "http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd"> <!-- 引入jdbc配置文件 --> < context:property-placeholder location = "classpath:jdbc.properties" /> <!-- 引入多配置文件 --> < context:property-placeholder location = "classpath:jdbc.properties,classpath:XXX.properties" /> <!-- 通過util引入config配置文件 --> <!-- <util:properties id="settings" location="classpath:config.properties" /> --> <!-- 掃描文件(自動將servicec層注入) --> < context:component-scan base-package = "修改成你的Config類所在的package" /></ beans > |
以上就是本文的全部內(nèi)容,希望對大家的學習有所幫助,也希望大家多多支持服務器之家。
原文鏈接:http://blog.csdn.net/swebin/article/details/57074660