xstream

XStream是一个用于将对象序列化为xml以及将xml生成对象的库，通过它可以非常方便的做对象与xml(json等其他格式)之间的转换。但是在使用XStream过程中，会遇到xml元素与对象元素并不是一一匹配的情况，而导致程序抛出异常。通过以下方法可以解决这个问题： XML转为对象时XML的要素比对象多 public class LetterHolder { private String A; private String B; // getters and setters ... } <LetterHolder> <A>This is letter A</A> <B>B</B> <C>C</C> </LetterHolder> 这时候我们可以使用这两个函数，告诉XStream要忽略掉未知的XML要素 ignoreUnknownElements(); ignoreUnknownElements(String pattern); 注意：XStream老版本可能没有这个函数（应该是1.4.5以上版本） 对象转为XML时想忽略掉对象中的某些元素 public class LetterHolder { private String A; private String B; private String C; // getters and setters ... }

XML和JSON是当今常用的两种数据描述与传输的格式，特别是涉及到JS时使用JSON颇为频繁。自然，在Java的世界里少不了完成JavaBean与这两种格式相互转换的组件，那就是XStream和JSON-lib。这里我简单记下XStream的用法。 其实相类似的工具早已有之。如果用过DWR的同志，一定有印像，DWR进行远程方法调用时也能为你完成JavaBean和JSON格式的双向转换的，所依赖的是它的各种Converter。再要是对Struts1的细节有所注意的话，Struts1的ActionServlet在初始化struts-config.xml时是通过commons-digester来完成XML到JavaBean转换的。相应的Apache也有一个commons-betwixt实现了JavaBean到XML的生成。 而我这里要说的XStream把JavaBean到XML和JSON的转换实现了，而JSON-lib则如其名，功能太显简陋了。要使用XStream，需下载到xstream包，当前版本是1.3.1。然后把xstream-1.x.x.jar添加到项目的Classpath上，可不依赖于其他包。在某些有要求时候才需要用到lib目录中的其他包，下面会提到。 简单说明XStream的使用吧，分为JavaBean->XML、JavaBean->JSON两部分内容。在开始例子之前

beans xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema

I am trying to find a solution to convert a map into root element attributes using XStream. I do not think this is possible but here is what I have tried to far. I created a custom converter and attached it to the root object, in the converter I then get access to the map that I am trying to convert into attributes, I iterate through the map and write the attirbute to the node, using writer.addAttribute(entry.getKey(), entry.getValue()); this does actually write the attributes to the root node e.g. The problem with this approach is that it does not process the rest of the document, it just

I have xml something like <parent> <message> <type>15</type> </message> </parent> Instead of creating a message object inside parent object, I need to represent message just as a String . So , when I do parent.message , the output is <type> 15 </type> instead of a message object. The idia is to build up the xml of message by processing the HierarchicalStreamReader . If you go down into <messsage> by calling reader.goDown() unfortunately reader.getValue() does not return the whole content of this element. Model @XStreamAlias("parent") @XStreamConverter(value = ParentConverter.class) public

I am using Xstream to serializing a Job object. It looks working fine. but deserializing, I have a problem: 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

I'm using XStream to read below example xml file. <list> <file>/setup/x86-linux2/bin/zip.txt</file> <file type="dir">/src/bin/</file> <name>test xml</name> </list> Below is my code for reading above xml, public class ListWithConverter { public static class FileConvertor implements Converter { public boolean canConvert(final Class clazz) { return clazz.equals(MyFile.class); } public void marshal(Object source, HierarchicalStreamWriter writer, MarshallingContext context) { throw new UnsupportedOperationException("Not supported to write file element yet."); //$NON-NLS-1$ } public Object unmarshal