最近开发的项目使用了SpringMVC的框架,用下来感觉SpringMVC的代码实现的非常优雅,功能也非常强大,
网上介绍Controller参数绑定、URL映射的文章都很多了,写这篇博客主要总结一下SpringMVC加载配置Properties文件的几种方式
1.通过context:property-placeholde实现配置文件加载
1.1、在spring.xml中加入context相关引用
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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 > <!-- 连接池最大使用连接数 --> < property name = "maxActive" > < value >20</ value > </ property > <!-- 初始化连接大小 --> < property name = "initialSize" > < value >1</ value > </ property > <!-- 获取连接最大等待时间 --> < property name = "maxWait" > < value >60000</ value > </ property > <!-- 连接池最大空闲 --> < property name = "maxIdle" > < value >20</ value > </ property > <!-- 连接池最小空闲 --> < property name = "minIdle" > < value >3</ value > </ property > <!-- 自动清除无用连接 --> < property name = "removeAbandoned" > < value >true</ value > </ property > <!-- 清除无用连接的等待时间 --> < property name = "removeAbandonedTimeout" > < value >180</ value > </ property > <!-- 连接属性 --> < property name = "connectionProperties" > < value >clientEncoding=UTF-8</ value > </ property > </ bean > |
1.5、在Java类中引用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 ( "${jdbc_url}" ) public String jdbcUrl; //这里变量不能定义成static @Value ( "${jdbc_username}" ) public String username; @Value ( "${jdbc_password}" ) public String password; } |
1.6、在controller中调用
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@RequestMapping ( "/service/**" ) @Controller public class JdbcController{ @Autowired private JdbcConfig Config; //引用统一的参数配置类 @Value ( "${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、测试
在ie中输入http://localhost:8080/testWeb/service/test 或http://localhost:8080/testWeb/service/test2
返回如下结果:
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{ jdbcUrl:"jdbc:mysql://localhost/testdb?useUnicode=true&characterEncoding=utf8" } |
注:通过context:property-placeholde加载多个配置文件
只需在第1.2步中将多个配置文件以逗号分隔即可
<context:property-placeholder location="classpath:jdbc.properties,classpath:XXX.properties"/>
2、通过util:properties实现配置文件加载
2.1、在spring.xml中加入util相关引用
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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类中引用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中调用
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@RequestMapping ( "/service2/**" ) @Controller public class ConfigController{ @Autowired private Config Config; //引用统一的参数配置类 @RequestMapping (value={ "/test" }) public ModelMap test(ModelMap modelMap) { modelMap.put( "gnss.service.url" ,Config.GNSS_SERVER_URL); return modelMap; } } |
2.6、测试
在ie中输入http://localhost:8080/testWeb/service2/test
返回如下结果:
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{ "gnss.service.url":"http://127.0.0.1:8080/gnss/services/data-world/rest" } |
3.直接在Java类中通过注解实现配置文件加载
3.1、在java类中引入配置文件
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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中调用 @RequestMapping ( "/service2/**" ) @Controller public class ConfigController{ @Autowired private Config Config; //引用统一的参数配置类 @RequestMapping (value={ "/test" }) public ModelMap test(ModelMap modelMap) { modelMap.put( "gnss.service.url" , Config.GNSS_SERVER_URL); return modelMap; } } |
3.3、测试
在ie中输入http://localhost:8080/testWeb/service2/test
返回如下结果:
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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" /> <!-- 通过util引入config配置文件 --> <!-- <util:properties id="settings" location="classpath:config.properties" /> --> <!-- 扫描文件(自动将servicec层注入) --> < context:component-scan base-package = "修改成你的Config类所在的package" /></ beans > |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://blog.csdn.net/swebin/article/details/57074660