如何在java xpath中在运行时禁用dtd？

Question

我在文件中得到了dtd而我无法将其删除。当我尝试用Java解析它时，我得到“引起：java.net.SocketException：网络无法访问：连接”，因为它的远程dtd。我能以某种方式禁用dtd检查吗？

Answer 1

您应该能够指定自己的EntityResolver，还是使用解析器的特定功能？有些方法，请参见此处。

更完整的例子：

<?xml version="1.0"?>
<!DOCTYPE foo PUBLIC "//FOO//" "foo.dtd">
<foo>
    <bar>Value</bar>
</foo>

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);
    }
}

希望这会有所帮助......

Answer 2

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();
  }

Answer 3

之前我遇到过这个问题。我通过下载并存储DTD的本地副本然后验证本地副本来解决它。您需要编辑XML文件以指向本地副本。

<!DOCTYPE root-element SYSTEM "filename">

此处了解更多信息： http://www.w3schools.com/dtd/dtd_intro。 ASP

我认为你也可以手动将某种validateOnParse属性设置为“false”。在你的解析器中。取决于您用于解析XML的库。

更多信息： http://www.w3schools.com/dtd/dtd_validation.asp