Java XML removeChild不工作？

您好，我已经查找了很多这个问题，但我找不到有效的解决方案。我基本上是要删除“job”节点，如第7行中声明的和第13行中删除的。存在0个运行时错误，但未删除节点

NodeList rootNodes = xml.getElementsByTagName("jobs");
        Node rootNode = rootNodes.item(0);
        Element rootElement = (Element) rootNode;
        NodeList jobsList = rootElement.getElementsByTagName("job");

        for (int i = 0; i < jobsList.getLength(); i++) {
            Node job = jobsList.item(i);
            Element jobElement = (Element) job;

            if(jobElement.getAttribute("id").equals(
            msgEvent.getMessage().getContentRaw().split(" ")[2]))
            {
                rootNode.removeChild(job);
                msgEvent.getChannel().sendMessage("Removed Job " + jobElement.getAttribute("id") + " (Summary: '" + jobElement.getAttribute("summary") + "')").complete();
            }
        }

nodelistrootnodes=xml.getElementsByTagName（“作业”）；
节点rootNode=rootNodes.item（0）；
元素rootElement=（元素）rootNode；
NodeList jobsList=rootElement.getElementsByTagName（“作业”）；
对于（int i=0；i

这里是XML

<?xml version = "1.0"?>
<jobs>
    <job payment = "50000" poster="171048434529337344" collect = "asdf" id = "1" summary="asdfd" expires="5/10/18"> </job>
    <job payment = "10000" poster="171048434529337344" collect = "asdf" id = "2" summary="asdf" expires="5/10/18"> </job>
</jobs>

---

由于这太大，无法评论，下面是我的测试代码和结果：

public static void main(String[] args) {
    try (InputStream is = Files.newInputStream(Paths.get("C://Temp/xx.xml"))) {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document xml = builder.parse(new InputSource(is));

        NodeList rootNodes = xml.getElementsByTagName("jobs");
        Node rootNode = rootNodes.item(0);
        Element rootElement = (Element) rootNode;
        NodeList jobsList = rootElement.getElementsByTagName("job");

        System.out.println("list before removal");
        for (int i = 0; i < jobsList.getLength(); i++) {
            Node job = jobsList.item(i);
            Element jobElement = (Element) job;
            System.out.println(jobElement.getAttribute("id"));
        }

        for (int i = 0; i < jobsList.getLength(); i++) {
            Node job = jobsList.item(i);
            Element jobElement = (Element) job;

            if (jobElement.getAttribute("id").equals("1")) {
                rootNode.removeChild(job);
            }
        }

        System.out.println("list after removal");
        jobsList = rootElement.getElementsByTagName("job");
        for (int i = 0; i < jobsList.getLength(); i++) {
            Node job = jobsList.item(i);
            Element jobElement = (Element) job;
            System.out.println(jobElement.getAttribute("id"));
        }

    } catch (Exception e) {
        e.printStackTrace();
    }
}

---

您如何知道节点没有被删除？我尝试了你的代码，但节点确实被删除了。当然，也就是说，如果

msgEvent

包含列表中的id，那么我可以肯定if语句确实通过了，因为sendMessage发生了。但是，它实际上似乎并没有从运行时或XML文件中删除节点。您是否将XML写回该文件？删除操作仅在内存中进行

list before removal
1
2
list after removal
2