关于ofbiz-component.xml文件中的resource-loader

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寻找文件的方式最后是通过ComponentConfig.java的getURL方法来解析的

public URL getURL(String resourceLoaderName, String location) throws ComponentException {        ResourceLoaderInfo resourceLoaderInfo = resourceLoaderInfos.get(resourceLoaderName);        if (resourceLoaderInfo == null) {            throw new ComponentException("Could not find resource-loader named: " + resourceLoaderName);        }        if ("component".equals(resourceLoaderInfo.type) || "file".equals(resourceLoaderInfo.type)) {//如果是＜resource-loader name="main" type="component" /＞            String fullLocation = getFullLocation(resourceLoaderName, location);            URL fileUrl = UtilURL.fromFilename(fullLocation);            if (fileUrl == null) {                throw new ComponentException("File Resource not found: " + fullLocation);            }            return fileUrl;        } else if ("classpath".equals(resourceLoaderInfo.type)) {            String fullLocation = getFullLocation(resourceLoaderName, location);            URL url = UtilURL.fromResource(fullLocation);            if (url == null) {                throw new ComponentException("Classpath Resource not found: " + fullLocation);            }            return url;        } else if ("url".equals(resourceLoaderInfo.type)) {            String fullLocation = getFullLocation(resourceLoaderName, location);            URL url = null;            try {                url = FlexibleLocation.resolveLocation(location);            } catch (java.net.MalformedURLException e) {                throw new ComponentException("Error with malformed URL while trying to load URL resource at location [" + fullLocation + "]", e);            }            if (url == null) {                throw new ComponentException("URL Resource not found: " + fullLocation);            }            return url;        } else {            throw new ComponentException("The resource-loader type is not recognized: " + resourceLoaderInfo.type);        }    }

其中主要是看
就是用getFullLocation(resourceLoaderName, location);方法
它做的事是判断如果类型是component，就进行rootLocation+location。而rootLocation就是组建所在路径，而location就是我们的entity-resource或者service-resource等等设置的location。
另外这个方法还有几个操作，判断是否要使用prependEnv，如果使用，会添加上prependEnv

if (UtilValidate.isNotEmpty(resourceLoaderInfo.prependEnv)) {            String propValue = System.getProperty(resourceLoaderInfo.prependEnv);            if (propValue == null) {                String errMsg = "The Java environment (-Dxxx=yyy) variable with name " + resourceLoaderInfo.prependEnv + " is not set, cannot load resource.";                Debug.logError(errMsg, module);                throw new IllegalArgumentException(errMsg);            }            buf.append(propValue);        }//判断是否要添加prefix        if (UtilValidate.isNotEmpty(resourceLoaderInfo.prefix)) {            buf.append(resourceLoaderInfo.prefix);        }

由此可以得出，resource-loader元素的完整配置是
＜resource-loader name="main" type="component" prepend-env="" prefix=""/＞

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