接上篇:
webx筆記-Resource

在實際開發(fā)中,ResourceLoadingService是直接接觸最多的接口,其屏蔽了內部的Loader和Resource相關細節(jié)

1.ResourceLoadingService接口定義

相比之前這么多的ResourceLoader,一個接口全部搞定

測試代碼

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

ResourceLoadingService可以對標spring的DefaultResourceLoader

DefaultResourceLoader的測試代碼

    @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());
        //注意這里前綴不能使用“classpath*:”触创，這樣不能真正訪問到對應的資源敞曹，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());
    }

當然ResourceLoadingService(下面稱RLS,簡寫方便)的實現遠遠沒這么簡單,從以上示例可以隱約感受到RLS肯定與ResourceLoader(webx)存在某種關聯關系,可以說RLS是其ResourceLoading的集大成者,包括了很多相關聯的功能,但對外只暴露一個接口服務,下面就慢慢剖析

2.RLS的定義

webx以解析schema的方式來定義RLS對象,如下定義

services:resource-loading表示RLS對象

<?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.資源的定義

如果只定義services:resource-loading標簽的話,還無法使用相關接口方法查找資源,必須還要定義相關資源

3.1 定義WebappResourceLoader

使用resource定義資源,之后就可以加載其目錄下的資源了

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

3.2 別名資源

使用resource-alias定義一個別名資源

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

當訪問specFolder目錄時,實際訪問的則是myfolder
如下示例

3.3 重定向資源

以下配置將/tf/cms重定向到myfolder目錄下

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

其他的可以參考webx文檔