getTextContent()到“空指针不应被解除引用”

Node node = ...; // 获取节点的方式
if (node != null) {
    String text = node.getTextContent();
    System.out.println(text);
} else {
    System.out.println("节点不存在");
}

import java.util.Optional;

Optional<Node> optionalNode = Optional.ofNullable(node);
optionalNode.ifPresent(n -> System.out.println(n.getTextContent()));

Node node = ...; // 获取节点的方式
if (node == null) {
    System.err.println("节点获取失败，原因可能是...");
    // 打印更多调试信息
} else {
    String text = node.getTextContent();
    System.out.println(text);
}

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
try {
    DocumentBuilder builder = factory.newDocumentBuilder();
    Document doc = builder.parse(new File("example.xml"));
    Node node = doc.getElementsByTagName("elementName").item(0);
    if (node != null) {
        System.out.println(node.getTextContent());
    }
} catch (Exception e) {
    e.printStackTrace();
}