从xstream反序列化xml文件

Question

我正在使用Xstream序列化Job对象。看起来不错。

但是反序列化，我有一个问题：

Exception in thread "main" com.thoughtworks.xstream.io.StreamException:  : only whitespace content allowed before start tag and not . (position: START_DOCUMENT seen .... @1:1) 
    at com.thoughtworks.xstream.io.xml.XppReader.pullNextEvent(XppReader.java:78)
    at com.thoughtworks.xstream.io.xml.AbstractPullReader.readRealEvent(AbstractPullReader.java:137)
    at com.thoughtworks.xstream.io.xml.AbstractPullReader.readEvent(AbstractPullReader.java:130)
    at com.thoughtworks.xstream.io.xml.AbstractPullReader.move(AbstractPullReader.java:109)
    at com.thoughtworks.xstream.io.xml.AbstractPullReader.moveDown(AbstractPullReader.java:94)
    at com.thoughtworks.xstream.io.xml.XppReader.<init>(XppReader.java:48)
    at com.thoughtworks.xstream.io.xml.XppDriver.createReader(XppDriver.java:44)
    at com.thoughtworks.xstream.XStream.fromXML(XStream.java:853)
    at com.thoughtworks.xstream.XStream.fromXML(XStream.java:845)

你们中的一个人以前遇到过这个问题吗？

这是我序列化的方法：

XStream xstream = new XStream();                    
Writer writer = new FileWriter(new File("model.xml"));
writer.write(xstream.toXML(myModel));
writer.close();

我也尝试这样做：

XStream xstream = new XStream();                    
OutputStream out = new FileOutputStream("model.xml");
xstream.toXML(myModel, out);

对于反序列化，我这样做是这样的：

XStream xstream = new XStream();

xstream.fromXML("model.xml");

XML结构：

<projectCar.CarImpl> 
   <CarModel reference="../.."></CarModel>
</projectCar.CarImpl>

如果是，我想听听。提前致谢。

Answer 1

fromXML没有文件名，请尝试：

File xmlFile = new File("model.xml");
xstream.fromXML(new FileInputStream(xmlFile));

以String形式读取html" target="_blank">文件内容。

在XStream中，字段名“ id”和“引用”也恰好是“系统属性”。使用以下代码：

CarImpl myModel = new CarImpl();

File xmlFile = new File("model.xml");

XStream xstream = new XStream();
xstream.useAttributeFor(String.class);
xstream.useAttributeFor(Integer.class);

Writer writer = new FileWriter(xmlFile);        
writer.write(xstream.toXML(myModel));
writer.close();

CarImpl fromXML = (CarImpl) xstream.fromXML(new FileInputStream(xmlFile));
System.out.println(fromXML);

如果将字段称为“ id”和“
reference”，则解组将失败，否则将成功。请参阅XStream常见问题解答

看一下新方法’aliasForSystemAttribute’的可能解决方案。