使用Java进行脱机XML验证 [英] Offline XML Validation with Java
问题描述
我需要弄清楚如何在架构脱机的情况下验证我的XML文件。环顾四天后，我能找到的基本上是我需要对模式进行内部引用。我需要找到它们，下载它们，并将引用更改为本地系统路径。我无法找到的确切是如何做到这一点。我在哪里以及如何将引用更改为内部而非外部？下载模式的最佳方法是什么？
I need to figure out how to validate my XML files with schema's offline. After looking around for a couple of days, what I was able to find was basically that I needed to have an internal reference to the schema. I needed to find them, download them, and change the reference to a local system path. What I was unable to find was exactly how to do that. Where and how can I change the reference to point internally instead of externally? What is the best way to download the schemas?
推荐答案
您可以设置自己的 ResourceResolver 和 LSInput 到 SchemaFactory ，以便调用
LSInput.getCharacterStream（）将提供来自本地路径的模式。
You can set your own Implementation of ResourceResolver and LSInput to the SchemaFactory so that the call of of LSInput.getCharacterStream() will provide a schema from a local path.
我已经编写了一个额外的类来进行离线验证。您可以将其称为
I have written an extra class to do offline validation. You can call it like
new XmlSchemaValidator().validate(xmlStream, schemaStream, "https://schema.datacite.org/meta/kernel-4.1/",
"schemas/datacite/kernel-4.1/");
两个InputStream正在通过。一个用于xml，一个用于模式。 baseUrl和localPath（类路径上的相对）作为第三个和第四个参数传递。验证器使用最后两个参数在localPath或相对于提供的baseUrl本地查找其他模式。
Two InputStream are beeing passed. One for the xml, one for the schema. A baseUrl and a localPath (relative on classpath) are passed as third and fourth parameter. The last two parameters are used by the validator to lookup additional schemas locally at localPath or relative to the provided baseUrl.
我已经使用一组模式和示例测试了< a href =https://schema.datacite.org/meta/kernel-4.1/ =nofollow noreferrer> https://schema.datacite.org/meta/kernel-4.1/ 。
I have tested with a set of schemas and examples from https://schema.datacite.org/meta/kernel-4.1/ .
完成示例：
@Test
public void validate4() throws Exception {
InputStream xmlStream = Thread.currentThread().getContextClassLoader().getResourceAsStream(
"schemas/datacite/kernel-4.1/example/datacite-example-complicated-v4.1.xml");
InputStream schemaStream = Thread.currentThread().getContextClassLoader()
.getResourceAsStream("schemas/datacite/kernel-4.1/metadata.xsd");
new XmlSchemaValidator().validate(xmlStream, schemaStream, "https://schema.datacite.org/meta/kernel-4.1/",
"schemas/datacite/kernel-4.1/");
}
XmlSchemaValidator将根据模式验证xml，并在本地搜索包含的模式。它使用ResourceResolver覆盖标准行为并在本地搜索。
The XmlSchemaValidator will validate the xml against the schema and will search locally for included Schemas. It uses a ResourceResolver to override the standard behaviour and to search locally.
public class XmlSchemaValidator {
/**
* @param xmlStream
* xml data as a stream
* @param schemaStream
* schema as a stream
* @param baseUri
* to search for relative pathes on the web
* @param localPath
* to search for schemas on a local directory
* @throws SAXException
* if validation fails
* @throws IOException
* not further specified
*/
public void validate(InputStream xmlStream, InputStream schemaStream, String baseUri, String localPath)
throws SAXException, IOException {
Source xmlFile = new StreamSource(xmlStream);
SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
factory.setResourceResolver((type, namespaceURI, publicId, systemId, baseURI) -> {
LSInput input = new DOMInputImpl();
input.setPublicId(publicId);
input.setSystemId(systemId);
input.setBaseURI(baseUri);
input.setCharacterStream(new InputStreamReader(
getSchemaAsStream(input.getSystemId(), input.getBaseURI(), localPath)));
return input;
});
Schema schema = factory.newSchema(new StreamSource(schemaStream));
javax.xml.validation.Validator validator = schema.newValidator();
validator.validate(xmlFile);
}
private InputStream getSchemaAsStream(String systemId, String baseUri, String localPath) {
InputStream in = getSchemaFromClasspath(systemId, localPath);
// You could just return in; , if you are sure that everything is on
// your machine. Here I call getSchemaFromWeb as last resort.
return in == null ? getSchemaFromWeb(baseUri, systemId) : in;
}
private InputStream getSchemaFromClasspath(String systemId, String localPath) {
System.out.println("Try to get stuff from localdir: " + localPath + systemId);
return Thread.currentThread().getContextClassLoader().getResourceAsStream(localPath + systemId);
}
/*
* You can leave out the webstuff if you are sure that everything is
* available on your machine
*/
private InputStream getSchemaFromWeb(String baseUri, String systemId) {
try {
URI uri = new URI(systemId);
if (uri.isAbsolute()) {
System.out.println("Get stuff from web: " + systemId);
return urlToInputStream(uri.toURL(), "text/xml");
}
System.out.println("Get stuff from web: Host: " + baseUri + " Path: " + systemId);
return getSchemaRelativeToBaseUri(baseUri, systemId);
} catch (Exception e) {
// maybe the systemId is not a valid URI or
// the web has nothing to offer under this address
}
return null;
}
private InputStream urlToInputStream(URL url, String accept) {
HttpURLConnection con = null;
InputStream inputStream = null;
try {
con = (HttpURLConnection) url.openConnection();
con.setConnectTimeout(15000);
con.setRequestProperty("User-Agent", "Name of my application.");
con.setReadTimeout(15000);
con.setRequestProperty("Accept", accept);
con.connect();
int responseCode = con.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_MOVED_PERM
|| responseCode == HttpURLConnection.HTTP_MOVED_TEMP || responseCode == 307
|| responseCode == 303) {
String redirectUrl = con.getHeaderField("Location");
try {
URL newUrl = new URL(redirectUrl);
return urlToInputStream(newUrl, accept);
} catch (MalformedURLException e) {
URL newUrl = new URL(url.getProtocol() + "://" + url.getHost() + redirectUrl);
return urlToInputStream(newUrl, accept);
}
}
inputStream = con.getInputStream();
return inputStream;
} catch (SocketTimeoutException e) {
throw new RuntimeException(e);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
private InputStream getSchemaRelativeToBaseUri(String baseUri, String systemId) {
try {
URL url = new URL(baseUri + systemId);
return urlToInputStream(url, "text/xml");
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
}
打印
Try to get stuff from localdir: schemas/datacite/kernel-4.1/http://www.w3.org/2009/01/xml.xsd
Get stuff from web: http://www.w3.org/2009/01/xml.xsd
Try to get stuff from localdir: schemas/datacite/kernel-4.1/include/datacite-titleType-v4.xsd
Try to get stuff from localdir: schemas/datacite/kernel-4.1/include/datacite-contributorType-v4.xsd
Try to get stuff from localdir: schemas/datacite/kernel-4.1/include/datacite-dateType-v4.1.xsd
Try to get stuff from localdir: schemas/datacite/kernel-4.1/include/datacite-resourceType-v4.1.xsd
Try to get stuff from localdir: schemas/datacite/kernel-4.1/include/datacite-relationType-v4.1.xsd
Try to get stuff from localdir: schemas/datacite/kernel-4.1/include/datacite-relatedIdentifierType-v4.xsd
Try to get stuff from localdir: schemas/datacite/kernel-4.1/include/datacite-funderIdentifierType-v4.xsd
Try to get stuff from localdir: schemas/datacite/kernel-4.1/include/datacite-descriptionType-v4.xsd
Try to get stuff from localdir: schemas/datacite/kernel-4.1/include/datacite-nameType-v4.1.xsd
打印显示验证器能够验证一组本地模式。只有
http://www.w3.org/2009/01/xml.xsd在本地无法使用，因此从互联网上获取。
The print shows that the validator was able to validate against a set of local schemas. Only
http://www.w3.org/2009/01/xml.xsdwas not available locally and therefore fetched from the internet.
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