我正在尝试使用 Java 中的套接字从客户端应用程序向服务器发送 xml 消息,但我不知道如何将其写入流:
String user = "Oscar"
String pass = "1234"
ObjectOutputStream oos = new ObjectOutputStream(
socket.getOutputStream());
// Create a XMLOutputFactory
XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();
// Create XMLEventWriter
XMLEventWriter eventWriter = outputFactory
.createXMLEventWriter(oos);
// Create a EventFactory
XMLEventFactory eventFactory = XMLEventFactory.newInstance();
XMLEvent end = eventFactory.createDTD("\n");
// Create and write Start Tag
eventWriter.add(eventFactory.createStartDocument());
eventWriter.add(end);
//Se crean los atributos del tag
ArrayList<Attribute> attributes = new ArrayList<Attribute>();
attributes.add(eventFactory.createAttribute("nickname", user));
attributes.add(eventFactory.createAttribute("password", pass));
eventWriter.add(eventFactory.createStartElement
("", "", "authenticate",attributes.iterator(), null));
eventWriter.add(end);
eventWriter.add(eventFactory.createEndElement("", "", "authenticate"));
eventWriter.add(eventFactory.createEndDocument());
我应该使用:
eventWriter.flush();
?
如果我这样做,它会给我以下例外:
javax.xml.stream.XMLStreamException:com.sun.org.apache.xerces.internal.impl.io.MalformedByteSequenceException:1 字节 UTF-8 序列的字节 1 无效。
它说我写错了消息。那么,写法是什么?
消息应该是:
<?xml version="1.0" encoding="UTF-8"?>" +
<authenticate nickname="Oscar" password="1234" />
这是我在服务器上用来读取消息的代码:
//the call
this.Interpreter.readCommand(socket.getInputStream());
和
//the method
@SuppressWarnings({ "unchecked", "null" })
public void readCommand(InputStream command) {
try {
// Fabrica de entrada de XML
XMLInputFactory inputFactory = XMLInputFactory.newInstance();
// Se crea un nuevo eventReader
XMLEventReader eventReader = inputFactory.createXMLEventReader(command);
while (eventReader.hasNext()) {
XMLEvent event = eventReader.nextEvent();
if (event.isStartElement()) {
StartElement startElement = event.asStartElement();
// Si tenemos un comando authenticate
if (startElement.getName().getLocalPart().equals("authenticate")) {
CommandAuthenticate(startElement);
}
}
}
}
catch (XMLStreamException e) {
e.printStackTrace();
}
}
public void CommandAuthenticate (StartElement startElement){
String nickname = null;
String password = null;
// Se leen los atributos del comando
Iterator<Attribute> attributes = startElement
.getAttributes();
while (attributes.hasNext()) {
Attribute attribute = attributes.next();
if (attribute.getName().toString().equals("nickname")) {
nickname = attribute.getValue();
}
if (attribute.getName().toString().equals("password")) {
password = attribute.getValue();
}
}
//here i call the right method for the data received
}