在java中解析XML字符串
我试图解析以下字符串以获取“orderNo”在java中解析XML字符串,java,xml,parsing,Java,Xml,Parsing,我试图解析以下字符串以获取“orderNo” String requestBody=“”； 节点列表nl=null； 试一试{ DocumentBuilderFactory domFactory=DocumentBuilderFactory.newInstance（）； DocumentBuilderFactory工厂=DocumentBuilderFactory.newInstance（）； DocumentBuilder=factory.newDocumentBuilder（）； 文档doc
String requestBody=“”；
节点列表nl=null；
试一试{
DocumentBuilderFactory domFactory=DocumentBuilderFactory.newInstance（）；
DocumentBuilderFactory工厂=DocumentBuilderFactory.newInstance（）；
DocumentBuilder=factory.newDocumentBuilder（）；
文档doc=builder.parse（requestBody）；
XPathFactory XPathFactory=XPathFactory.newInstance（）；
XPath=xPathfactory.newXPath（）；
XPathExpression expr=xpath.compile（“//ShipmentList/shipping/ShipmentLines/ShipmentLine[@OrderNo]”）；
nl=（NodeList）expr.evaluate（doc，XPathConstants.NODESET）；
}捕获（XPathExpressionException e1）{
//TODO自动生成的捕捉块
e1.printStackTrace（）；
}捕获（ParserConfiguration异常e1）{
//TODO自动生成的捕捉块
e1.printStackTrace（）；
}捕获（SAXE1异常）{
//TODO自动生成的捕捉块
e1.printStackTrace（）；
}捕获（IOE1异常）{
//TODO自动生成的捕捉块
e1.printStackTrace（）；
}
“\”String requestBody=“问题从XML字符串中的未转义引号开始。然后，如何将字符串解析为Document
对象。Document doc=builder.parse（requestBody）；
正在调用DocumentBuilder.parse（字符串uri）
version，其中uri是要解析的XML的位置
由于有一个字符串
要作为XML进行解析，因此必须传递DocumentBuilder
一个InputSource
对象，如Document doc=builder.parse（新的InputSource（新的StringReader（requestBody））；
这将使字符串进入文档
对象
现在我们必须修复如何访问ShipmentLine
元素中的属性OrderNo
。要进行此更改XPathExpression expr=xpath.compile（“//ShipmentList/ShipmentLines/ShipmentLines/ShipmentLine[@OrderNo]”；
到XPathExpression expr=xpath.compile（“//ShipmentList/Shipping/ShipmentLines/ShipmentLine/@OrderNo”）；
现在您应该可以得到一个NodeList
，您可以对其进行迭代
带更改的代码
试试那样的
public static void main(String[] args) {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
DocumentBuilder builder;
Document doc = null;
try {
builder = factory.newDocumentBuilder();
doc = builder.parse("C:/shipment.xml");
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
try {
XPathExpression expr = xpath.compile("/ShipmentList/Shipment/ShipmentLines/ShipmentLine");
NodeList nodes = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
for (int i = 0; i < nodes.getLength(); i++) {
Node nNode = nodes.item(i);
System.out.println("\nCurrent Element :" + nNode.getNodeName());
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element eElement = (Element) nNode;
System.out.println("OrderNo :" + eElement.getAttribute("OrderNo"));
}
}
} catch (XPathExpressionException e) {
e.printStackTrace();
}
} catch (ParserConfigurationException | SAXException | IOException e) {
e.printStackTrace();
}
}
publicstaticvoidmain（字符串[]args）{
DocumentBuilderFactory工厂=DocumentBuilderFactory.newInstance（）；
factory.setNamespaceAware（true）；
文档生成器；
单据单据=空；
试一试{
builder=factory.newDocumentBuilder（）；
doc=builder.parse（“C:/shipping.xml”）；
XPathFactory XPathFactory=XPathFactory.newInstance（）；
XPath=xpathFactory.newXPath（）；
试一试{
XPathExpression expr=xpath.compile（“/ShipmentList/Shipping/ShipmentLines/ShipmentLine”）；
NodeList节点=（NodeList）expr.evaluate（doc，XPathConstants.NODESET）；
对于（int i=0；i
您面临哪些问题？“我已尝试使用上述代码“上面的代码没有编译，那么您怎么可能尝试使用它呢？为了扩展@shar1er80修复的XPath问题，在原始代码中，XPath语句选择了包含OrderNo属性的ShipmentLine元素。这是因为方括号-/ShipmentLine[@OrderNo]-正在定义一个过滤器。改为使用路径步骤-/ShipmentLine/@OrderNo-意味着您现在正在从ShipmentLine元素中选择OrderNo属性。@RajgauriKhemnar如果我的答案解决了您的问题，请检查，以便将您的问题标记为已回答。
Document doc = builder.parse(new ByteArrayInputStream(requestBody.getBytes()));
import java.io.IOException;
import java.io.StringReader;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
public class StackOverflow {
public static void main(String[] args) {
String requestBody =
"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>"
+ "<ShipmentList>"
+ "<Shipment ActualShipmentDate=\"2018-06-26T11:25:00+05:30\" DocumentType=\"0005\" TotalWeight=\"55.5\" TotalWeightUOM=\"LB\" TrackingNo=\"9461236897846412938163\">"
+ "<ShipmentLines>"
+ "<ShipmentLine OrderNo=\"1529904772887\" PrimeLineNo=\"1\" Quantity=\"3\" SubLineNo=\"1\"/>"
+ "<ShipmentLine OrderNo=\"1529904772887\" PrimeLineNo=\"2\" Quantity=\"3\" SubLineNo=\"1\"/>"
+ "<ShipmentLine OrderNo=\"1529904772887\" PrimeLineNo=\"3\" Quantity=\"3\" SubLineNo=\"1\"/>"
+ "<ShipmentLine OrderNo=\"1529904772887\" PrimeLineNo=\"4\" Quantity=\"3\" SubLineNo=\"1\"/>"
+ "<ShipmentLine OrderNo=\"1529904772887\" PrimeLineNo=\"5\" Quantity=\"3\" SubLineNo=\"1\"/>"
+ "</ShipmentLines>"
+ "<Extn ExtnPackageASN=\"55538770655551006451\" ExtnPackageID=\"6247442951596360944\" ExtnPackLength=\"25.0\" ExtnLengthUOM=\"IN\" ExtnPackWidth=\"20.0\" ExtnWidthUOM=\"IN\" ExtnPackHeight=\"16.0\" ExtnHeightUOM=\"IN\" ExtnCarrierMethodId=\"83\"/>"
+ "</Shipment>"
+ "</ShipmentList>";
NodeList nl = null;
try {
DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(new InputSource(new StringReader(requestBody)));
XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
XPathExpression expr = xpath.compile("//ShipmentList/Shipment/ShipmentLines/ShipmentLine/@OrderNo");
nl = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
// Output NodeList
for (int i = 0; i < nl.getLength(); i++) {
System.out.println(nl.item(i));
}
} catch (XPathExpressionException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (ParserConfigurationException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (SAXException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
OrderNo="1529904772887"
OrderNo="1529904772887"
OrderNo="1529904772887"
OrderNo="1529904772887"
OrderNo="1529904772887"
public static void main(String[] args) {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
DocumentBuilder builder;
Document doc = null;
try {
builder = factory.newDocumentBuilder();
doc = builder.parse("C:/shipment.xml");
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
try {
XPathExpression expr = xpath.compile("/ShipmentList/Shipment/ShipmentLines/ShipmentLine");
NodeList nodes = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
for (int i = 0; i < nodes.getLength(); i++) {
Node nNode = nodes.item(i);
System.out.println("\nCurrent Element :" + nNode.getNodeName());
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element eElement = (Element) nNode;
System.out.println("OrderNo :" + eElement.getAttribute("OrderNo"));
}
}
} catch (XPathExpressionException e) {
e.printStackTrace();
}
} catch (ParserConfigurationException | SAXException | IOException e) {
e.printStackTrace();
}
}