我為Oracle Access Manager開發(fā)了一個(gè)身份驗(yàn)證插件簡而言之，它包含：類以下XML我正在嘗試從XML文件中動態(tài)獲取<Value>an 的標(biāo)記 。<Attribute><Plugin type="Authentication"> <author>Phill</author> <email>phill@example.com</email> <creationDate>12:47:00, 2019-07-11</creationDate> <description>Phill-Plugin</description> <configuration> <AttributeValuePair> <Attribute type="string" length="60">GenerateUrl</Attribute> <mandatory>true</mandatory> <instanceOverride>false</instanceOverride> <globalUIOverride>true</globalUIOverride> <value>This is the value i'm trying to retrieve</value> </AttributeValuePair> </configuration></Plugin>類 try { CredentialParam tem = context.getCredential().getParam("GenerateUrl"); String temp = (String) tem.getValue(); System.out.println("TEST: " + temp); generateUrl = temp + "The User" + user; } catch (Exception e) { System.out.println("\n\n\n-------------------\n"); System.out.println("- Input Is: -\n"); System.out.println("- "+e+" -\n"); System.out.println("-------------------\n"); generateUrl = "A URL" + "The User" + user; }重要的提示：該context對象是AuthenticationContext包含有關(guān)插件信息的實(shí)例根據(jù) Oracle 的文檔，這是某人檢索的確切方式Attribute，但我總是得到NullPointerException還有其他方法可以檢索嗎<Value>？
2 回答
qq_遁去的一_1
TA貢獻(xiàn)1725條經(jīng)驗(yàn) 獲得超8個(gè)贊
我不得不嘗試另一種方法并正確解析XML
如果你可以在這里使用外部庫是如何：
public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {
File stocks = new File("PhillPlugin.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(stocks);
doc.getDocumentElement().normalize();
NodeList nodes = doc.getElementsByTagName("AttributeValuePair");
for (int i = 0; i < nodes.getLength(); i++) {
Node node = nodes.item(i);
if (node.getNodeType() == Node.ELEMENT_NODE) {
Element element = (Element) node;
if(i==0)
{
tempurlGen=getValue("value",element);
System.out.println("GenerateUrl: " + getValue("value", element));
}
else if (i==1)
{
tempurlVal=getValue("value",element);
System.out.println("ValidateUrl: " + getValue("value", element));
}
}
}
}
static String getValue(String tag, Element element) {
NodeList nodes = element.getElementsByTagName(tag).item(0).getChildNodes();
Node node = (Node) nodes.item(0);
return node.getNodeValue();
}
如果你不能javax在這里包含庫是如何解析XML使用流
public void getXMLData() throws Exception {
File stocks = new File("PhillPlugin.xml");
BufferedInputStream in = new BufferedInputStream(new FileInputStream(stocks));
StringBuilder sb = new StringBuilder();
int cp;
while ((cp = in.read()) != -1) {
sb.append((char) cp);
String t = sb.toString();
if (t.contains("</AttributeValuePair>")) {
String test = sb.toString();
String test1p[] = test.split("<value>|</value>");
tempurlGen = test1p[1];
break;
}
}
sb = new StringBuilder();
while ((cp = in.read()) != -1) {
sb.append((char) cp);
String t = sb.toString();
if (t.contains("</AttributeValuePair>")) {
String test = sb.toString();
String test1p[] = test.split("<value>|</value>");
tempurlVal = test1p[1];
break;
}
}
}
確保你定義tempurlGen和tempurlVal
人到中年有點(diǎn)甜
TA貢獻(xiàn)1895條經(jīng)驗(yàn) 獲得超7個(gè)贊
嘗試這個(gè)：
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
"author",
"email",
"creationDate",
"description",
"configuration"
})
@XmlRootElement(name = "Plugin")
public class Plugin {
//Add getters and setters including ones for inner classes
@XmlElement(required = true)
private String author;
@XmlElement(required = true)
private String email;
@XmlElement(required = true)
private String creationDate;
@XmlElement(required = true)
private String description;
@XmlElement(required = true)
private Plugin.Configuration configuration;
@XmlAttribute(name = "type")
private String type;
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
"attributeValuePair"
})
public static class Configuration {
@XmlElement(name = "AttributeValuePair", required = true)
private Plugin.Configuration.AttributeValuePair attributeValuePair;
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
"attribute",
"mandatory",
"instanceOverride",
"globalUIOverride",
"value"
})
public static class AttributeValuePair {
@XmlElement(name = "Attribute", required = true)
private Plugin.Configuration.AttributeValuePair.Attribute attribute;
@XmlElement(required = true)
private String mandatory;
@XmlElement(required = true)
private String instanceOverride;
@XmlElement(required = true)
private String globalUIOverride;
@XmlElement(required = true)
private String value;
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
"value"
})
public static class Attribute {
@XmlValue
private String value;
@XmlAttribute(name = "type")
private String type;
@XmlAttribute(name = "length")
private Byte length;
}
}
}
}
對于解組部分：
JAXBContext jaxbContext = JAXBContext.newInstance(Plugin.class);
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
StringReader reader = new StringReader("xml string here");
Plugin plugin = (Plugin) unmarshaller.unmarshal(reader);
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