将日期字段格式化为XStream中的字符串

Question

我有一个日期字段,当使用XStream转换为xml 时,以毫秒和区域给出时间.我只需将其转换或格式化为"MMMM dd, yyyy HH:mm:ss".如何使用XStream做到这一点？我不想改变吸气剂和制定者.谢谢.

我的课:

    public class Datas {
    private String name;
    private Calendar dob;

    public String getName() {
        return name;
    }

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

    public Calendar getDob() {
        return dob;
    }

    public void setDob(Calendar dob) {
        this.dob = dob;
    }

    public static void main(String[] args) {
        Datas datas = new Datas();
        datas.setName("Ahamed");
        datas.setDob(Calendar.getInstance());
        XStream stream = new XStream();
        System.out.println(stream.toXML(datas));
    }
}

输出:

<Datas>
  <name>Ahamed</name>
  <dob>
    <time>1329081818801</time>
    <timezone>Asia/Calcutta</timezone>
  </dob>
</Datas>

我想格式化dob标签而不更改getter和setter.谢谢.

Answer 1

一种简单的方法是使用适当的格式注册(XStream!)DateConverter,例如:

import com.thoughtworks.xstream.converters.basic.DateConverter;

XStream xstream = new XStream();
String dateFormat = "yyyyMMdd";
String timeFormat = "HHmmss";
String[] acceptableFormats = {timeFormat};
xstream.registerConverter(new DateConverter(dateFormat, acceptableFormats));

这对我有用,我不需要创建一个新的转换器类.

Answer 2

Calendar字段的自定义转换器：

public class DateConverter implements Converter {

    private SimpleDateFormat formatter = new SimpleDateFormat(
            "MMMM dd, yyyy HH:mm:ss");

    public boolean canConvert(Class clazz) {
        // This converter is only for Calendar fields.
        return Calendar.class.isAssignableFrom(clazz);
    }

    public void marshal(Object value, HierarchicalStreamWriter writer,
            MarshallingContext context) {
        Calendar calendar = (Calendar) value;
        Date date = calendar.getTime();
        writer.setValue(formatter.format(date));
    }

    public Object unmarshal(HierarchicalStreamReader reader,
            UnmarshallingContext context) {
        GregorianCalendar calendar = new GregorianCalendar();
        try {
            calendar.setTime(formatter.parse(reader.getValue()));
        } catch (ParseException e) {
            throw new ConversionException(e.getMessage(), e);
        }
        return calendar;
    }
}

将上述转换器注册到XStream对象，如下所示：

XStream xStream = new XStream();
xStream.registerConverter(new DateConverter());

现在，xStream对象将查找“日历”字段，并将按照“自定义转换器”中的规定进行编组。