如何禁用XStream中的漂亮打印(空白/换行符)?

时间:2009-05-21 19:19:03

标签: java xml json xstream

这就是我为XML创建XStream实例的方法:

XStream xstream = new XStream();

这适用于JSON:

private final XStream xstream = new XStream(new JsonHierarchicalStreamDriver() {
        public HierarchicalStreamWriter createWriter(Writer writer) {
            return new JsonWriter(writer, JsonWriter.DROP_ROOT_MODE);
        }
    });

它们都是非常打印(缩进)输出。

如何让XStream禁用漂亮的打印?

6 个答案:

答案 0 :(得分:19)

谢谢,你的帖子帮了!!!这是我用来转换为String的内容。

String strXML = "";
XStream xs = new XStream();
StringWriter sw = new StringWriter();
xs.marshal(this,  new CompactWriter(sw));
strXML = sw.toString();

答案 1 :(得分:12)

在社区的帮助下,我找到了答案。

对于XML ,您必须更改序列化的方式:

该行:

xStream.toXML(o, new OutputStreamWriter(stream, encoding));

更改为行

xStream.marshal(o, new CompactWriter(new OutputStreamWriter(stream, encoding)));

对于JSON ,您只能更改XStream的创建方式。因此,XStream的初始化更改为:

private final XStream xstreamOut = new XStream(new JsonHierarchicalStreamDriver() {
    public HierarchicalStreamWriter createWriter(Writer writer) {
        return new JsonWriter(writer, new char[0], "", JsonWriter.DROP_ROOT_MODE);
    }
});

请注意,使用了4参数JsonWriter构造函数。

答案 2 :(得分:4)

在xstream上使用紧凑编写器的marschal方法

xstream.marshal(someObject, new CompactWriter(out)); 

答案 3 :(得分:1)

漂亮打印的默认行为来自AbstractXmlDriver.createWriter()方法(XStream使用XppDriver作为其默认的分层流驱动程序,这扩展了AbstractXmlDriver):

public HierarchicalStreamWriter createWriter(Writer out) {
    return new PrettyPrintWriter(out, getNameCoder());
}

如果要全局禁用漂亮打印(同时保留所有其他默认行为)并且只使用简单的toXML(o)方法而不是使用此处建议的其他每个使用选项,那么可以将XStream实例初始化为如下。这改为使用CompactWriter覆盖上述方法。

XStream xstream = new XStream(new XppDriver() {
    @Override
    public HierarchicalStreamWriter createWriter(Writer out) {
        return new CompactWriter(out, getNameCoder());
    }
});

答案 4 :(得分:0)

这对我有用:

XStream stream = new XStream(new StaxDriver());
stream.toXML(messages, out);
StringWriter out = new StringWriter();
String s = out.toString();
LOG.info(s);

答案 5 :(得分:0)

以这种方式创建XStream实例:

XStream xstream = new XStream(new JsonHierarchicalStreamDriver() {
        public HierarchicalStreamWriter createWriter(Writer writer) {
            return new JsonWriter(writer, JsonWriter.DROP_ROOT_MODE, new JsonWriter.Format(new char[0], new char[0], 0));
        }
});

这里是Format类的构造函数:

/**
 * Create a new Formatter.
 * 
 * @param lineIndenter the characters used for indenting the line
 * @param newLine the characters used to create a new line
 * @param mode the flags for the format modes
 * @since 1.4
 */
public Format(char[] lineIndenter, char[] newLine, int mode) {
    this(lineIndenter, newLine, mode, new NoNameCoder());
}

检查源代码JsonWriter以获得更多信息