如何在运行时在 java 的 xpath 中禁用 dtd？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/243728/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
how to disable dtd at runtime in java's xpath?
提问by IAdapter
I got dtd in file and I cant remove it. When i try to parse it in Java I get "Caused by: java.net.SocketException: Network is unreachable: connect", because its remote dtd. can I disable somehow dtd checking?
我在文件中有 dtd，我无法删除它。当我尝试用 Java 解析它时，我得到“Caused by: java.net.SocketException: Network is unreachable: connect”，因为它的远程 dtd。我可以以某种方式禁用 dtd 检查吗？
回答by toolkit
You should be able to specify your own EntityResolver, or use specific features of your parser? See herefor some approaches.
您应该能够指定自己的 EntityResolver，还是使用解析器的特定功能？有关一些方法，请参见此处。
A more complete example:
一个更完整的例子：
<?xml version="1.0"?>
<!DOCTYPE foo PUBLIC "//FOO//" "foo.dtd">
<foo>
<bar>Value</bar>
</foo>
And xpath usage:
和 xpath 用法：
import java.io.File;
import java.io.IOException;
import java.io.StringReader;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
public class Main {
public static void main(String[] args) throws Exception {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
builder.setEntityResolver(new EntityResolver() {
@Override
public InputSource resolveEntity(String publicId, String systemId)
throws SAXException, IOException {
System.out.println("Ignoring " + publicId + ", " + systemId);
return new InputSource(new StringReader(""));
}
});
Document document = builder.parse(new File("src/foo.xml"));
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
String content = xpath.evaluate("/foo/bar/text()", document
.getDocumentElement());
System.out.println(content);
}
}
Hope this helps...
希望这可以帮助...
回答by David
This worked for me:
这对我有用：
SAXParserFactory saxfac = SAXParserFactory.newInstance();
saxfac.setValidating(false);
try {
saxfac.setFeature("http://xml.org/sax/features/validation", false);
saxfac.setFeature("http://apache.org/xml/features/nonvalidating/load-dtd-grammar", false);
saxfac.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
saxfac.setFeature("http://xml.org/sax/features/external-general-entities", false);
saxfac.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
}
catch (Exception e1) {
e1.printStackTrace();
}
回答by Owen
I had this problem before. I solved it by downloading and storing a local copy of the DTD and then validating against the local copy. You need to edit the XML file to point to the local copy.
我以前遇到过这个问题。我通过下载并存储 DTD 的本地副本，然后针对本地副本进行验证来解决该问题。您需要编辑 XML 文件以指向本地副本。
<!DOCTYPE root-element SYSTEM "filename">
Little more info here: http://www.w3schools.com/dtd/dtd_intro.asp
这里有更多信息：http: //www.w3schools.com/dtd/dtd_intro.asp
I think you can also manually set some sort of validateOnParse property to "false" in your parser. Depends on what library you're using to parse the XML.
我认为您还可以在解析器中手动将某种 validateOnParse 属性设置为“false”。取决于您用来解析 XML 的库。
More info here: http://www.w3schools.com/dtd/dtd_validation.asp
