Struts2学习：Action获取properties文件的值

怼烎@ 2022-10-02 00:52 85阅读 0赞

[2019独角兽企业重金招聘Python工程师标准>>> ][2019_Python_] ![hot3.png][]

配置文件路径：

![37787122ef6bdcce69cbdb1ec3a4c762992.jpg][]

配置内容：

![85ea914235a3efed119fbca0f06e624d8c5.jpg][]

**方法一：不使用自动装配，使用ClassLoader**

Action内被调用的函数添加下段代码：

Properties props = new Properties();
    props.load(UploadFileAction.class.getClassLoader().getResourceAsStream("/struts/struts-config.properties"));
    System.out.println(props.getProperty("destPath"));

执行效果：

![5099d695ad764b5819c489d471f54ee06d8.jpg][]

为了便于其他Action重用，可以将此部分写成一个工具类：

import com.opensymphony.xwork2.Action;
    import java.io.IOException;
    import java.util.Properties;
    public class StrutsConfig {
        public Properties GetProperties(Class actionClass) throws IOException {
            Properties props = new Properties();
            props.load(actionClass.getClassLoader().getResourceAsStream("/struts/struts-config.properties"));
            return props;
        }
    }

然后Action里如此调用即可：

Properties props = new StrutsConfig().GetProperties(UploadFileAction.class);
    System.out.println(props.getProperty("destPath"));

**方法二：@ConfigurationProperties + @PropertySource**

import org.springframework.boot.context.properties.ConfigurationProperties;
    import org.springframework.context.annotation.PropertySource;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    @ConfigurationProperties
    @PropertySource("/struts/struts-config.properties")
    public class Index {
        private String destPath;
        @RequestMapping("/")
        public String getProps() {
            return destPath;
        }
        public String getDestPath() {
            return destPath;
        }
        public void setDestPath(String destPath) {
            this.destPath = destPath;
        }
    }

[对于非application.properties的配置，需@PropertySource指明配置文件的路径；否则默认是从application.properties中读取配置，不需要写该注解。][application.properties_PropertySource_application.properties]

**方法三：spring的xml配置中配置上properties，然后通过@Value注入（该方法在Spring MVC中验证过，但是不知道集成struts2后是否受影响）**

spring-context.xml

<util:properties id="APP_PROP" local-override="true" location="classpath:owlforest.properties" />

owlforest.properties

jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/linfu_test_db?useUnicode=true&characterEncoding=utf-8
    jdbc.username=root
    jdbc.password=root

代码样例：

import com.alibaba.druid.pool.DruidDataSource;
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.PropertySource;
    
    @Configuration
    public class DataSourceConfiguration {
        @Value("#{APP_PROP['jdbc.driver']}")
        private String driver;
    
        @Value("#{APP_PROP['jdbc.url']}")
        private String url;
    
        @Value("#{APP_PROP['jdbc.username']}")
        private String username;
    
        @Value("#{APP_PROP['jdbc.password']}")
        private String password;
    
        public DruidDataSource createDataSource(){
            DruidDataSource dataSource = new DruidDataSource();
            dataSource.setDriverClassName(driver);
            dataSource.setUrl(url);
            dataSource.setUsername(username);
            dataSource.setPassword(password);
            dataSource.setDefaultAutoCommit(true);
            return dataSource;
        }
    }

**方法四：使用spring的PropertiesFactoryBean**

@Bean
    public PropertiesFactoryBean getProperties() {
        PropertiesFactoryBean propertiesFactoryBean = new PropertiesFactoryBean();
        propertiesFactoryBean.setLocations(new ClassPathResource("application.properties"));
        return propertiesFactoryBean;
    }

调用：

@Autowired
    private PropertiesFactoryBean propertiesFactoryBean;
    public String getProperties(String key) throws IOException {
        Properties properties = propertiesFactoryBean.getObject();
        return properties.getProperty(key);  
    }

转载于:https://my.oschina.net/u/4108765/blog/3059596

[2019_Python_]: https://my.oschina.net/u/2663968/blog/3061697
[hot3.png]: /images/20220113/179e3e80800044c2a95a8aa5d0b3939c.png
[37787122ef6bdcce69cbdb1ec3a4c762992.jpg]: /images/20220113/18cce665f6f345e892a0f6ae1772f984.png
[85ea914235a3efed119fbca0f06e624d8c5.jpg]: /images/20220113/201fef6bb0324cedbd692c701c487fa5.png
[5099d695ad764b5819c489d471f54ee06d8.jpg]: /images/20220113/7d1bea4b52284f36be8071f375b2279d.png
[application.properties_PropertySource_application.properties]: mailto:%E5%AF%B9%E4%BA%8E%E9%9D%9Eapplication.properties%E7%9A%84%E9%85%8D%E7%BD%AE%EF%BC%8C%E9%9C%80@PropertySource%E6%8C%87%E6%98%8E%E9%85%8D%E7%BD%AE%E6%96%87%E4%BB%B6%E7%9A%84%E8%B7%AF%E5%BE%84%EF%BC%9B%E5%90%A6%E5%88%99%E9%BB%98%E8%AE%A4%E6%98%AF%E4%BB%8Eapplication.properties%E4%B8%AD%E8%AF%BB%E5%8F%96%E9%85%8D%E7%BD%AE%EF%BC%8C%E4%B8%8D%E9%9C%80%E8%A6%81%E5%86%99%E8%AF%A5%E6%B3%A8%E8%A7%A3%E3%80%82