Question

我需要解析这个我以字符串格式接收的xml我要提取lat和lon

<?xml version="1.0" encoding="UTF-8"?>
<rsp stat="ok">
   <cell 
      lat="13.035037526666665" 
      lon="77.56784941333333" 
      mcc="404" 
      mnc="45" 
      lac="1020" 
      cellid="13443" 
      averageSignalStrength="0" 
      range="-1" 
      samples="15" 
      changeable="1" 
      radio="GSM" />
</rsp>

请有人帮我这个

我试过这个但没有得到输出

DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
InputSource src = new InputSource();
src.setCharacterStream(new StringReader(data));

Document doc = builder.parse(src);
String lat = doc.getElementsByTagName("lat").item(0).getTextContent();
String lon = doc.getElementsByTagName("lon").item(0).getTextContent();

Answer 1

lat是元素cell的属性。因此，您不应使用getElementsByTagName("lat")，而应使用getAttribute("lat") :(代码未经测试）

DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
InputSource src = new InputSource();
src.setCharacterStream(new StringReader(data));

Document doc = builder.parse(src);
Element docElement = doc.getDocumentElement();
String lat = docElement.getElementsByTagName("cell").item(0).getAttribute("lat");
String lon = docElement.getElementsByTagName("cell").item(0).getAttribute("lon");

Answer 2

public static void main(String[] args) throws Exception {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.parse(new FileInputStream("C:\\dev\\Workspace\\ahportal\\benefits-base-sdk\\portlets\\ah-hm-enrl-charts-portlet\\docroot\\WEB-INF\\src\\com\\aonhewitt\\portal\\base\\charts\\bean\\employee.xml"));
        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("lat=> " + node.getAttributes().getNamedItem("lat")
                        .getNodeValue());

                System.out.println("lon=> " + node.getAttributes().getNamedItem("lon")
                        .getNodeValue());
            }

        }
    }

请尝试以上代码。它应该工作。如果它不适合你，请告诉我。

Answer 3

根据您对坐标的处理方式，我建议将它们包装到一个位置对象中，并按住lat和amp; LON。我不建议使用DOM API，而是使用像JAXB这样的数据绑定库，或者使用更短，更灵活的方法data projection library（披露：我是该项目的附属机构）并将值自动转换为Double。

import org.xmlbeam.XBProjector;
import org.xmlbeam.annotation.XBRead;

public class ReadCoords {

  // Object holding coordinates
  public interface Location {

    // Access methods for coordinates
    @XBRead("./@lat")
    Double getLat();

    @XBRead("./@lon")
    Double getLon();
  }

  public static void main(String[] args) {
    Location location = new  XBProjector().io().url("res://data.xml").evalXPath("/rsp/cell").as(Location.class);
    System.out.println(location.getLat()+"/"+location.getLon());
  }
}

解析在String中收到的XML以获得lat和long

3 个答案: