PropertyPlaceholderConfigurer：使用外部属性文件 [英] PropertyPlaceholderConfigurer: Use external properties file

问题描述

如何配置PropertyPlaceholderConfigurer以使用属性文件相对（一些目录向上）战争？

How to configure PropertyPlaceholderConfigurer to use properties files relative (some directories up) to the war?

我们有多次运行战争，每个战争应该读取其配置例如 ../../ etc / db.properties 。

We have running a war multiple times and each war should read its configuration for example from ../../etc/db.properties.

更新：

是的，属性文件在战争之外。目录结构是：

Yes, the properties files are outside the war. The directory structure is:

/htdocs/shop/live/apache-tomat/webapps/shop.war
应为
/htdocs/shop/live/etc/db.properties

/htdocs/shop/test/apache-tomat/webapps/shop.war

/htdocs/shop/test/etc/db.properties

推荐答案

最后，我们引入了一个新的资源类型relative：：

Finally, we have introduced a new resource type "relative:":

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="ignoreResourceNotFound" value="true" />
    <property name="locations">
        <list>
            <value>classpath:db.properties</value>
            <value>relative:../../../etc/db.properties</value>
        </list>
    </property>
</bean>

我们扩展了XmlWebApplicationContext以注入自定义资源处理：

We have extended XmlWebApplicationContext to inject custom resource handling:

public class Context extends XmlWebApplicationContext {
    @Override
    public Resource getResource(String location) {
        if (location.startsWith(RelativeResource.RELATIVE_URL_PREFIX)) {
            String relativePath = location.substring(RelativeResource.RELATIVE_URL_PREFIX.length());
            return new RelativeResource(getServletContext(), relativePath);
        }
        return super.getResource(location);
    }
}

这是相对的资源类：

public class RelativeResource extends AbstractResource {
    public static final String RELATIVE_URL_PREFIX = "relative:";

    private final ServletContext servletContext;
    private final String relativePath;

    public RelativeResource(ServletContext servletContext, String relativePath) {
        this.servletContext = servletContext;
        this.relativePath = relativePath;
    }

    @Override
    public String getDescription() {
        return "RelativeResource [" + relativePath + "]";
    }

    @Override
    public boolean isReadable() {
        return true;
    }

    @Override
    public boolean isOpen() {
        return true;
    }

    @Override
    public InputStream getInputStream() throws IOException {
        String rootPath = WebUtils.getRealPath(servletContext, "/");
        if (!rootPath.endsWith(File.separator)) rootPath += File.separator;
        String path = rootPath + relativePath;
        return new FileInputStream(path);
    }

}

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