我需要在.xml文件中搜索元素。它具有以下结构：
<elements number="3">
<contact>
<name>PAUL</name>
<code>A1</code>
</contact>
<contact>
<name>LAURA</name>
<code>A2</code>
</contact>
<contact>
<name>JOHN</name>
<code>A3</code>
</contact>
我的解决方案是这样的：
public static String readContactsList(String nameContact) {
XMLInputFactory xmlif = null;
XMLStreamReader xmlr = null;
String contacts = "contacts.xml";
try {
xmlif = XMLInputFactory.newInstance();
xmlr = xmlif.createXMLStreamReader(contacts, new FileInputStream(contacts));
while (xmlr.hasNext()) {
switch (xmlr.getEventType()) {
case XMLStreamConstants.START_DOCUMENT:
System.out.println("Start Read Doc " + contacts);
break;
case XMLStreamConstants.START_ELEMENT:
System.out.println("Tag " + xmlr.getLocalName());
for (int i = 0; i < xmlr.getAttributeCount(); i++)
System.out.printf(" => attribut %s->%s%n", xmlr1.getAttributeLocalName(i), xmlr.getAttributeValue(i));
break;
case XMLStreamConstants.END_ELEMENT:
System.out.println("END-Tag " + xmlr.getLocalName());
break;
case XMLStreamConstants.COMMENT:
System.out.println("// comment " + xmlr.getText());
break;
case XMLStreamConstants.CHARACTERS:
if (xmlr.getText().trim().length() > 0)
if (!xmlr.getText().equals(nameContact)) {
xmlr.next();
}
else
System.out.println("-> " + xmlr.getText());
break;
}
xmlr.next();
}
}
catch (Exception e) {
System.out.println("reader initialization error");
System.out.println(e.getMessage());
}
return contacts;
}
此方法接收一个联系人的名称（即“ LAURA”），并且应返回其代码。我想念的是如何滚动.xml文件以及如何访问不同标签的内容。
谢谢！
下面的代码（基于你的）应该工作，但要注意，如果你切换标签的顺序<name>和<code>它将会失败。
另外，请注意，您不会关闭流。只是放一个finally {xmlr.close();}关闭流。
public static String readContactsList(String nameContact) {
boolean match = false;
XMLInputFactory xmlif = null;
XMLStreamReader xmlr = null;
String contacts = "contacts.xml";
try {
xmlif = XMLInputFactory.newInstance();
xmlr = xmlif.createXMLStreamReader(contacts, new FileInputStream(contacts));
while (xmlr.hasNext()) {
switch (xmlr.getEventType()) {
case XMLStreamConstants.START_DOCUMENT:
System.out.println("Start Read Doc " + contacts);
break;
case XMLStreamConstants.START_ELEMENT:
System.out.println("Tag " + xmlr.getLocalName());
for (int i = 0; i < xmlr.getAttributeCount(); i++)
System.out.printf(" => attribut %s->%s%n", xmlr.getAttributeLocalName(i), xmlr.getAttributeValue(i));
break;
case XMLStreamConstants.END_ELEMENT:
System.out.println("END-Tag " + xmlr.getLocalName());
break;
case XMLStreamConstants.COMMENT:
System.out.println("// comment " + xmlr.getText());
break;
case XMLStreamConstants.CHARACTERS:
if (xmlr.getText().trim().length() > 0) {
if (!xmlr.getText().equals(nameContact)) {
System.out.println("-> " + xmlr.getText());
if (match) {
return xmlr.getText();
}
}
else {
System.out.println("-> " + xmlr.getText());
//This is just in case the name and the code be the same
if (match) {
return xmlr.getText();
}
match = true;
}
}
break;
}
xmlr.next();
}
}
catch (Exception e) {
System.out.println("reader initialization error");
System.out.println(e.getMessage());
}
return contacts;
}
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