java - Java 中类似于 XML 的文本文件解析

Question

需要读取一个类似XML的文本文件。该文本文件由多个XML文件组成，带有父标签。需要逐行解析该文件，并需要写入所需子标签的相应元素甚至在父标记内重复多次，在一行中，到另一个文本文件。需要将元素写入父标记后的下一行。我知道如何读取文件并写入文件，但我无法获得根据要求阅读它的逻辑。请帮助我。非常感谢任何帮助。

1234566546 AbcdeXYZ-23243423 1030253498 23423423423

<parentnode xmlns="http://www.fpml.org/FpML-5/recordkeeping" fpmlVersion="5-5" xmlns:abcde="http://www.abcde.com/ext" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.abcde.com/ext /../xmls/XYZ/recordkeeping/abcde-ext.xsd">
<Child1 Child1Scheme="http://www.google.com">1234566546</Child1>
<Child1 Child1Scheme="http://www.fpml.org/coding-scheme/external/UNique">AbcdeXYZ-154555</Child1>
<country countryScheme="http://www.fpml.org/coding-scheme/external/country-identifier">1030253498</country>
<state stateScheme="http://www.fpml.org/coding-scheme/external/state-identifier">434343242</state>
</parentnode>

<parentnode xmlns="http://www.fpml.org/FpML-5/recordkeeping" fpmlVersion="5-5" xmlns:abcde="http://www.abcde.com/ext" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.abcde.com/ext /../xmls/XYZ/recordkeeping/abcde-ext.xsd">
<Child1 Child1Scheme="http://www.google.com">1234566546</Child1>
<Child1 Child1Scheme="http://www.fpml.org/coding-scheme/external/UNique">AbcdeXYZ-4566545</Child1>
<country countryScheme="http://www.fpml.org/coding-scheme/external/country-identifier">1030253498</country>
<state stateScheme="http://www.fpml.org/coding-scheme/external/state-identifier">2323232323</state>
</parentnode>

Answer 1

手动解析 xml 是一种痛苦的浪费时间。如果只创建一个带有包装标签的临时文件并使用 xml 解析器会更容易，如下所示:

    Path inputFile = Paths.get("input.xml");
    Path tempFile = Paths.get("temp.xml");
    Path outputFile = Paths.get("output.xml");

    // make a temp file with fixed xml formatting
    Files.write(tempFile, "<root>".getBytes());
    for (String line : Files.readAllLines(inputFile, StandardCharsets.UTF_8)) {
        Files.write(tempFile, line.getBytes(), StandardOpenOption.APPEND);
    }
    Files.write(tempFile, "</root>".getBytes(), StandardOpenOption.APPEND);


    // parse xml and build output string
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = factory.newDocumentBuilder();
    Document doc = builder.parse(tempFile.toFile());
    StringBuilder sb = new StringBuilder();

    NodeList parents = doc.getElementsByTagName("parentnode");
    for (int i = 0; i < parents.getLength(); i++) {
        NodeList children = parents.item(i).getChildNodes();
        for (int j=0; j<children.getLength(); j++) {
            sb.append(children.item(j).getTextContent() + " ");
        }
    }


    // clean up temp file
    Files.delete(tempFile);


    // write output file
    Files.write(outputFile, sb.toString().getBytes());