接上篇:
webx笔记-Resource

在实际开发中,ResourceLoadingService是直接接触最多的接口,其屏蔽了内部的Loader和Resource相关细节

1.ResourceLoadingService接口定义

相比之前这么多的ResourceLoader,一个接口全部搞定

测试代码

    @Test
    public void serviceTest() throws IOException {
        resourceLoadingService = (ResourceLoadingService) factory.getBean("testResource");
        Resource res = resourceLoadingService.getResource("test.txt");
        // 取得资源文件
        File file = resourceLoadingService.getResourceAsFile("test.txt");
        // 取得资源URL
        URL url = resourceLoadingService.getResourceAsURL("test.txt");
        // 取得资源输入流
        InputStream stream = resourceLoadingService.getResourceAsStream("test.txt");
    }

ResourceLoadingService可以对标spring的DefaultResourceLoader

DefaultResourceLoader的测试代码

    @Test
    public void testResourceLoader() throws IOException {
        ResourceLoader loader = new DefaultResourceLoader();
        Resource resource = loader.getResource("http://m2.xunbaozl.com/wxHome/selete.html");
        System.out.println(resource instanceof UrlResource); //true
        printContent(resource.getInputStream());
        //注意这里前缀不能使用“classpath*:”，这样不能真正访问到对应的资源，exists()返回false
        resource = loader.getResource("classpath:core/resources/test.txt");
        System.out.println(resource instanceof ClassPathResource); //true
        printContent(resource.getInputStream());
//        resource = loader.getResource(System.getProperty("user.dir")+"/src/main/resources/core/resources/test.txt");
//        System.out.println(resource instanceof ClassPathResource); //true
//        printContent(resource.getInputStream());
    }

当然ResourceLoadingService(下面称RLS,简写方便)的实现远远没这么简单,从以上示例可以隐约感受到RLS肯定与ResourceLoader(webx)存在某种关联关系,可以说RLS是其ResourceLoading的集大成者,包括了很多相关联的功能,但对外只暴露一个接口服务,下面就慢慢剖析

2.RLS的定义

webx以解析schema的方式来定义RLS对象,如下定义

services:resource-loading表示RLS对象

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns:beans="http://www.springframework.org/schema/beans"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:services="http://www.alibaba.com/schema/services"
             xmlns:filters="http://www.alibaba.com/schema/services/resource-loading/filters"
             xmlns:loaders="http://www.alibaba.com/schema/services/resource-loading/loaders"
             xsi:schemaLocation="
                 http://www.alibaba.com/schema/services http://localhost:8080/schema/services.xsd
                 http://www.alibaba.com/schema/services/resource-loading/filters http://localhost:8080/schema/services-resource-loading-filters.xsd
                 http://www.alibaba.com/schema/services/resource-loading/loaders http://localhost:8080/schema/services-resource-loading-loaders.xsd
                 http://www.springframework.org/schema/beans http://localhost:8080/schema/www.springframework.org/schema/beans/spring-beans.xsd
             ">
    <services:resource-loading id="testResource">
        
    </services:resource-loading>
</beans:beans>

3.资源的定义

如果只定义services:resource-loading标签的话,还无法使用相关接口方法查找资源,必须还要定义相关资源

3.1 定义WebappResourceLoader

使用resource定义资源,之后就可以加载其目录下的资源了

    <services:resource-loading>
        <resource pattern="/"  internal="false">
            <loaders:webapp-loader />
        </resource>
    </services:resource-loading>

3.2 别名资源

使用resource-alias定义一个别名资源

    <services:resource-loading>
        <resource pattern="/"  internal="false">
            <loaders:webapp-loader />
        </resource>
        <resource-alias pattern="/specFolder" name="/myfolder" />
    </services:resource-loading>

当访问specFolder目录时,实际访问的则是myfolder
如下示例

3.3 重定向资源

以下配置将/tf/cms重定向到myfolder目录下

    <services:resource-loading id="testResource">
        <resource pattern="/tf/cms">
            <loaders:file-loader basedir="../myfolder" />
        </resource>
    </services:resource-loading>

其他的可以参考webx文档