xml如何使用Java从SOAP响应中检索元素值？

Question

我试图从salesforce提供的以下字符串响应中获取标记值

<?xml version="1.0" encoding="UTF-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns="http://soap.sforce.com/2006/04/metadata">
   <soapenv:Body>
      <listMetadataResponse>
         <result>
            <createdById>00528000001m5RRAAY</createdById>
            <createdByName>Hariprasath Thanarajah</createdByName>
            <createdDate>1970-01-01T00:00:00.000Z</createdDate>
            <fileName>objects/EmailMessage.object</fileName>
            <fullName>EmailMessage</fullName>
            <id />
            <lastModifiedById>00528000001m5RRAAY</lastModifiedById>
            <lastModifiedByName>Hariprasath Thanarajah</lastModifiedByName>
            <lastModifiedDate>1970-01-01T00:00:00.000Z</lastModifiedDate>
            <namespacePrefix />
            <type>CustomObject</type>
         </result>
      </listMetadataResponse>
   </soapenv:Body>
</soapenv:Envelope>

上面我们有标签<fullName>。我需要获取标记中的值并将其放入字符串数组中。我尝试过使用substring方法，但它只返回一个值。有人能建议我这样做吗

Answer 1

我试过像下面这样

public static Document loadXMLString(String response) throws Exception
{
    DocumentBuilderFactory dbf =DocumentBuilderFactory.newInstance();
    DocumentBuilder db = dbf.newDocumentBuilder();
    InputSource is = new InputSource(new StringReader(response));

    return db.parse(is);
}

public static List<String> getFullNameFromXml(String response, String tagName) throws Exception {
    Document xmlDoc = loadXMLString(response);
    NodeList nodeList = xmlDoc.getElementsByTagName(tagName);
    List<String> ids = new ArrayList<String>(nodeList.getLength());
    for(int i=0;i<nodeList.getLength(); i++) {
        Node x = nodeList.item(i);
        ids.add(x.getFirstChild().getNodeValue());             
        System.out.println(nodeList.item(i).getFirstChild().getNodeValue());
    }
    return ids;
}

从上面的代码中，您将获得ID列表。之后，您可以将它们放入字符串数组并返回到字符串数组，如下所示

List<String> output = getFullNameFromXml(response, "fullName");
String[] strarray = new String[output.size()];
output.toArray(strarray);
System.out.print("Response Array is "+Arrays.toString(strarray));

Answer 2

使用以下代码解析SOAP响应并获取元素值
将XML响应保存在系统上的任何位置。调用方法getResult（）。这是一种通用方法。它接受webservice响应的负载类类型并返回java对象

File xmlFile = new File("response file path from step 1");    
Reader fileReader = new FileReader(xmlFile);    
BufferedReader bufReader = new BufferedReader(fileReader);    
StringBuilder sb = new StringBuilder();    
String line = bufReader.readLine();    
while (line != null) {    
sb.append(line).append("\n");    
line = bufReader.readLine();    
}    
String xml2String = sb.toString();           
bufReader.close();

public <T> T getResult(String xml, String path, Class<T> type) {    
final Node soapBody = getSoapBody(xml, path);    
return getInstance(soapBody, type);    
}    
private Node getSoapBody(String xml, String path) {     
try {    
SOAPMessage message = getSoapMessage(xml, path);    
Node firstElement = getFirstElement(message);    
return firstElement;     
}    
catch (Exception e) {    
throw new RuntimeException(e);    
}    
}     
private SOAPMessage getSoapMessage(String xml, String path) throws SOAPException, 
IOException {    
MessageFactory factory = MessageFactory.newInstance();    
FileInputStream fis = new FileInputStream(path);    
BufferedInputStream inputStream = new BufferedInputStream(fis);    
return factory.createMessage(new MimeHeaders(), inputStream);    
}    
private Node getFirstElement(SOAPMessage message) throws SOAPException {    
final NodeList childNodes = message.getSOAPBody().getChildNodes();    
Node firstElement = null;    
for (int i = 0; i < childNodes.getLength(); i++) {    
if (childNodes.item(i) instanceof Element) {    
firstElement = childNodes.item(i);    
break;    
}    
}    
return firstElement;    
}    
private <T> T getInstance(Node body, Class<T> type) {    
try {    
JAXBContext jc = JAXBContext.newInstance(type);    
Unmarshaller u = jc.createUnmarshaller();    
return (T) u.unmarshal(body);    
}    
catch (JAXBException e) {    
throw new RuntimeException(e);    
}    
}    

Answer 3

如果您只想解析这个元素，可以使用SAX或StAX解析器，如下所述https://www.javacodegeeks.com/2013/05/parsing-xml-using-dom-sax-and-stax-parser-in-java.html

   SAXParserFactory factory = SAXParserFactory.newInstance();
    SAXParser saxParser = factory.newSAXParser();

    DefaultHandler handler = new DefaultHandler() {

    boolean fullName = false;

    public void startElement(String uri, String localName,String qName, 
                Attributes attributes) throws SAXException {

        System.out.println("Start Element :" + qName);

        if (qName.equals("fullName")) {
            fullName = true;
        }
    }

    public void characters(char ch[], int start, int length) throws SAXException {

        if (fullName ) {
            System.out.println("Full Name : " + new String(ch, start, length));
            fullName = false;
        }
    }
}
saxParser.parse(mySoapResponse, handler);

或者，您可能想阅读更多关于JAX-WSAPI的内容，以创建使用SalesforceWeb服务的SOAP客户端