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">
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1.2、引入jdbc配置文件
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< context:property-placeholder location = "classpath:jdbc.properties" />
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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
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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 >
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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 ( "${jdbc_password}" )
public String password;
}
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1.6、在controller中调用
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@RequestMapping ( "/service/**" )
@Controller
public class JdbcController{
@Autowired
private JdbcConfig Config; //引用统一的参数配置类
@Value ( "${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;
}
}
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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"
}
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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">
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2.2、 引入config配置文件
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< util:properties id = "settings" location = "classpath:config.properties" />
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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
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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;
}
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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;
}
}
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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"
}
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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;
}
}
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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"
}
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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 >
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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