java中的接口是类吗
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2023-06-08
详解SpringMVC加载配置Properties文件的几种方式
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
xmlns:context="http://springframework.org/schema/context" xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans-4.0.xsd http://springframework.org/schema/context http://springframework.org/schema/context/spring-context.xsd"> 1.2、引入jdbc配置文件 1.3、jdbc.properties的配置如下 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 destroy-method="close" > 1.5、在java类中引用jdbc.properties中的配置 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("${jdbc_password}") public String password; } 1.6、在controller中调用 @RequestMapping("/service/**") @Controller public class JdbcController{ @Autowired private JdbcConfig Config; //引用统一的参数配置类 @Value("${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: { 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 复制代码 代码如下: 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 xmlns:context="http://springframework.org/schema/context" xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xmlns:util="http://springframework.org/schema/util" xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans-4.0.xsd http://springframework.org/schema/context http://springframework.org/schema/context/spring-context.xsd http://springframework.org/schema/util http://springframework.org/schema/util/spring-util-4.0.xsd"> 2.2、 引入config配置文件 2.3、config.properties的配置如下 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 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 @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: { "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 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 pubhttp://lic 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: { "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: xmlns:context="http://springframework.org/schema/context" xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xmlns:util="http://springframework.org/schema/util" xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans-4.0.xsd http://springframework.org/schema/context http://springframework.org/schema/context/spring-context.xsd http://springframework.org/schema/util http://springframework.org/schema/util/spring-util-4.0.xsd">
xmlns:context="http://springframework.org/schema/context"
xsi:schemaLocation="http://springframework.org/schema/beans
http://springframework.org/schema/beans/spring-beans-4.0.xsd
http://springframework.org/schema/context
http://springframework.org/schema/context/spring-context.xsd">
1.2、引入jdbc配置文件
1.3、jdbc.properties的配置如下
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
destroy-method="close" >
destroy-method="close" >
1.5、在java类中引用jdbc.properties中的配置
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("${jdbc_password}")
public String password;
}
1.6、在controller中调用
@RequestMapping("/service/**")
@Controller
public class JdbcController{
@Autowired
private JdbcConfig Config; //引用统一的参数配置类
@Value("${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:
{
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
复制代码 代码如下:
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
xmlns:context="http://springframework.org/schema/context" xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xmlns:util="http://springframework.org/schema/util" xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans-4.0.xsd http://springframework.org/schema/context http://springframework.org/schema/context/spring-context.xsd http://springframework.org/schema/util http://springframework.org/schema/util/spring-util-4.0.xsd"> 2.2、 引入config配置文件 2.3、config.properties的配置如下 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 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 @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: { "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 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 pubhttp://lic 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: { "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: xmlns:context="http://springframework.org/schema/context" xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xmlns:util="http://springframework.org/schema/util" xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans-4.0.xsd http://springframework.org/schema/context http://springframework.org/schema/context/spring-context.xsd http://springframework.org/schema/util http://springframework.org/schema/util/spring-util-4.0.xsd">
xmlns:context="http://springframework.org/schema/context"
xmlns:xsi="http://w3.org/2001/XMLSchema-instance"
xmlns:util="http://springframework.org/schema/util"
xsi:schemaLocation="http://springframework.org/schema/beans
http://springframework.org/schema/beans/spring-beans-4.0.xsd
http://springframework.org/schema/context
http://springframework.org/schema/context/spring-context.xsd
http://springframework.org/schema/util
http://springframework.org/schema/util/spring-util-4.0.xsd">
2.2、 引入config配置文件
2.3、config.properties的配置如下
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
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
@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:
{
"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
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
pubhttp://lic 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:
{
"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:
xmlns:context="http://springframework.org/schema/context" xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xmlns:util="http://springframework.org/schema/util" xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans-4.0.xsd http://springframework.org/schema/context http://springframework.org/schema/context/spring-context.xsd http://springframework.org/schema/util http://springframework.org/schema/util/spring-util-4.0.xsd">
xmlns:context="http://springframework.org/schema/context"
xmlns:xsi="http://w3.org/2001/XMLSchema-instance"
xmlns:util="http://springframework.org/schema/util"
xsi:schemaLocation="http://springframework.org/schema/beans
http://springframework.org/schema/beans/spring-beans-4.0.xsd
http://springframework.org/schema/context
http://springframework.org/schema/context/spring-context.xsd
http://springframework.org/schema/util
http://springframework.org/schema/util/spring-util-4.0.xsd">
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