使用JAVA解析XML

时间:2014-01-31 19:14:29

标签: java parsing xml-parsing

我正在尝试解析xml doc的一些特定部分。我正在考虑从分析部分提取数据,我需要警告,错误,传递,我需要进入每个部分()并获得结果和结果级别和文本例如在这个“错误”中我需要获得错误级别和文本“ERROR”。

<document>
    <configuration>
    </configuration>
    <data>
    </data>
    <analysis warnings="5" errors="3" information="0" passed="false">
        <files>
        </files>
        <results>
            <form>
                <section number="0">
                    <result level="error">ERROR</result>
                    <result level="error">ERROR</result>
                    <result level="error">ERROR</result>
                    <result level="warning">Warning</result>
                    <result level="warning">Warning</result>
                </section>
                <section number="1">
                    <result level="warning">WARNING</result>
                </section>
                <section number="2">
                    <result level="warning">WARNING</result>
                    <result level="warning">WARNING</result>
                </section>
            </form>
        </results>
    </analysis>
</document>

我有以下代码:

public void ProcessXMLFromPath(String path) throws Exception
    {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document =  builder.parse(path);
        NodeList nodeList = document.getDocumentElement().getChildNodes();

        for (int i = 0; i < nodeList.getLength(); i++) {
          Node node = nodeList.item(i);
          if (node instanceof Element) {
            System.out.println(node.getAttributes().toString());
            NodeList childNodes = node.getChildNodes();
            for (int j = 0; j < childNodes.getLength(); j++) {
              Node cNode = childNodes.item(j);

              if (cNode instanceof Element) {
                  System.out.println(cNode.getNodeName().toString()); 
                  if(cNode.getNodeName().toString() == "analysis")
                  {
                      String content = cNode.getLastChild().getTextContent().trim();
                      System.out.println(content);
                      //I thought this would print the children under the analysis section to the screen but I was mistaken. It does however make it to this point.
                  }
              }
            }

          }

        }
    }

我要打印到控制台的唯一内容是:

configuration
data
analysis

任何帮助将不胜感激!

2 个答案:

答案 0 :(得分:1)

代码的几个问题:

  1. cNode.getNodeName().toString() == "analysis",与.equals
  2. 进行字符串比较
  3. analysisdocument的直接后代(根据我们这里的xml部分),因此必须尽早检查。您的代码会在level 3而不是2
  4. 检查它
  5. 您需要深入分析以获取resultsformtext节点。
  6. 修改 基于注释,在没有多个for循环的情况下遍历的有效方法是递归,如下所示:

    public static void main(String[] args) throws ParserConfigurationException,
            SAXException, IOException {
        InputStream path = new FileInputStream("sample.xml");
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.parse(path);
        traverse(document.getDocumentElement());
    
    }
    
    public static void traverse(Node node) {
        NodeList list = node.getChildNodes();
        for (int i = 0; i < list.getLength(); i++) {
            Node currentNode = list.item(i);
            traverse(currentNode);
    
        }
    
        if (node.getNodeName().equals("result")) {
            System.out.println("This -> " + node.getTextContent());
        }
    
    }
    

    这将结果显示为:

    This -> ERROR
    This -> ERROR
    This -> ERROR
    This -> Warning
    This -> Warning
    This -> WARNING
    This -> WARNING
    This -> WARNING
    

答案 1 :(得分:0)

对于这三个中的每一个(configurationdataanalysis),获取他们的子节点并向下钻取,直至找到错误(即result标签)。您可以在analysis下方找到这些内容(但不会直接位于其下方)。因此,您可以向下钻取analysis