Question

我使用JAXB编组对象，当前我的控制台输出与生成的XML文件不同：

控制台：

<!-- My awesome comment --> 
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Cat>
    <name>Toby</name>
</Cat>

生成：

<Cat>
    <name>Toby</name>
</Cat>

我希望控制台中的输出与Cat.xml中生成的输出匹配，但事实并非如此。我的问题是我生成“正确”Cat.xml的方法有什么不对？最低功能计划如下：

public class CatDriver{  
public static void main(String[] args) throws JAXBException, IOException,
            ParserConfigurationException, TransformerException {

        Cat cat = new Cat();
        cat.setName("Toby");
        JAXBContext context = JAXBContext.newInstance(Cat.class);

        Marshaller m = context.createMarshaller();
        m.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
        m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
        m.setProperty(
                "com.sun.xml.bind.xmlHeaders",
                "<!-- My awesome comment"
                        + " --> \n <?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>");
        m.marshal(cat, System.out);
        Writer w = null;
        try {
            w = new FileWriter("C:/test/Cat.xml");
            m.marshal(cat, w);

        } finally {
            try {
                w.close();
            } catch (Exception e) {
            }
        }

    }
}

@XmlRootElement(name = "Cat")
class Cat {
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

}

Answer 1

看一下这篇文章：http://blog.bdoughan.com/2010/09/jaxb-xml-infoset-preservation.html

这不完全是你需要的，但可能是更好的方法。

Answer 2

Cat cat = new Cat();
cat.setName( "Toby" );
JAXBContext context = JAXBContext.newInstance( Cat.class );

Marshaller m = context.createMarshaller();
m.setProperty( Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE );
m.setProperty( Marshaller.JAXB_FRAGMENT, Boolean.FALSE );

m.marshal( cat, System.out );
Writer w = null;
try
{
  w = new FileWriter( "Cat.xml" );
  w.append( "<!-- My awesome comment -->" );
  w.flush();
  m.marshal( cat, w );

}
finally
{
  try
  {
    w.close();
  }
  catch ( Exception e )
  {
  }
}

JAXB将任意文本写为从stream生成的XML文件的第一行

2 个答案: