ApacheXML公共资源解析器同时支持OASISXML目录和旧的OASISTR9401目录格式。见 https://xerces.apache.org/xml-commons/components/resolver/ 。

要在测试项目中启用目录查找,请执行以下操作:

1. 从下载XML通用解析程序 http://xerces.apache.org/mirrors.cgi#binary .

2. 提取resolver.jar并将其添加到类路径中。

3. 创建一个名为catalogManager.properties的文本文件,并将其放在类路径上。在此文件中,添加目录路径:

   catalogs=./doctypes/catalog
   

   目录文件的位置也可以通过 xml.catalog.files Java系统属性。

4. 在parsexmlwithcatalog.java中,添加 import 语句并创建 CatalogResolver . 将该实例设置为分析器的 EntityResolver :

   import org.apache.xml.resolver.tools.CatalogResolver;
   ...
   
   CatalogResolver cr = new CatalogResolver();
   builder.setEntityResolver(cr);
   

我之所以发布这个示例代码,是因为它结合了mzjn建议的org.apache.xml.resolver.tools.catalogsolver的使用,并成功地使用了我的示例 http://aapro.net/CatalogTest.zip . 也就是说,如果我运行它,并用yes(我想要验证)回答第一个提示,用test\doctypes文件夹的绝对路径回答第二个提示,然后浏览到catalogtest.xml,它成功地遵循test\doctypes中的catalog指令到“..other/forms/catalog”,后者依次指定tDTD的位置为:“public”-//test//forms document type//en“”forms.dtd”,并告诉我我的顶级节点称为“form”。

现在,我将把这个解决方案合并到我的XML diff程序中。如果我发现需要调整来处理多条目目录路径和/或处理目录和catalog.xml文件的混合,我将发布一个更新。但那可能需要几个星期(或更长时间),我认为这段代码到了有人会发现它有用的程度。

import java.io.File;
import java.io.FilenameFilter;
import java.util.Map.Entry;
import java.util.Properties;

import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.xml.resolver.tools.CatalogResolver;
import org.w3c.dom.Document;

public class ParseXmlWithCatalog {

        // Offer end-user the convenience of not having to specify which will be used,
        // catalog and/or catalog.xml.
        private static FilenameFilter catalogFileFilter = new FilenameFilter() {
                @Override
                public boolean accept(File dir, String name) {
                        if (name.equals("catalog") || name.equals("catalog.xml")) {
                                return true;
                        } else {
                                return false;
                        }
                }
        };

        public static void main(String[] args) {
                int validating = JOptionPane.showOptionDialog(null, "Do you want validation?",
                                "Please choose \"Yes\" for validation", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null,
                                null, JOptionPane.YES_OPTION);
                if (validating == JOptionPane.YES_OPTION) {
                        String catPath = JOptionPane.showInputDialog(null,
                                        "Please enter semi-colon-separated list of absolute paths to catalog folders, in desired search order; these are the locations of catalog or catalog.xml files, not the filenames.",
                                        "Enter catalog path", JOptionPane.QUESTION_MESSAGE);
                        String[] catLocs = catPath.split(";");
                        StringBuilder sb = new StringBuilder();
                        for (String catLoc : catLocs) {
                                File[] catFiles = new File(catLoc).listFiles(catalogFileFilter);
                                for (File catFile : catFiles) {
                                        if (sb.length() > 0) {
                                                sb.append(";");
                                        }
                                        sb.append(catFile.toURI());
                                }
                        }
                        System.setProperty("xml.catalog.files", sb.toString());
                        System.out.println(
                                        "Using the following top-level catalog files:\n" + System.getProperty("xml.catalog.files"));
                        System.setProperty("relative-catalogs", "yes");
                }
                parseDoc(getFile(args), validating == JOptionPane.YES_OPTION);
        }

        private static boolean parseDoc(File inFile, boolean validate) {
                if (inFile == null) {
                        JOptionPane.showMessageDialog(null, "Failure opening input XML.");
                }
                try {
                        DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
                        if (!validate) {
                                builderFactory.setValidating(false);
                                builderFactory.setAttribute("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
                        }
                        DocumentBuilder builder = builderFactory.newDocumentBuilder();
                        CatalogResolver resolver = new CatalogResolver();
                        builder.setEntityResolver(resolver);
                        Document testDoc = builder.parse(inFile.getPath());
                        JOptionPane.showMessageDialog(null,
                                        "The top level node is \"" + testDoc.getFirstChild().getNodeName() + "\"");
                } catch (Exception exc) {
                        JOptionPane.showMessageDialog(null, "Failure parsing input XML: " + exc.getMessage());
                        return false;
                }
                return true;
        }

        public static File getFile(String[] args) {
                if (args.length > 1) {
                        JOptionPane.showMessageDialog(null, "Too many arguments.");
                        return null;
                }
                if (args.length == 1) {
                        return new File(args[0]);
                }
                JFileChooser fileChooser = new JFileChooser();
                fileChooser.setMultiSelectionEnabled(false);
                fileChooser.setDialogTitle("Select 1 XML file");
                FileNameExtensionFilter filter = new FileNameExtensionFilter("XML Files", "xml", "ditamap", "dita", "style");
                fileChooser.setFileFilter(filter);
                int response = fileChooser.showOpenDialog(null);
                if (response != JFileChooser.APPROVE_OPTION) {
                        // aborted
                        return null;
                }
                return fileChooser.getSelectedFile();
        }
}