xstream是个好东西。对于配置文件的读取很方便。在mybog中我就用到了。不过今天打算用yupoo的api来做相册。发现xstream对于xmlnode的attribute解析支持不是那么的好。
对于这种节点格式的非常的简单
<result>
<page>1</page>
<pages>1</pages>
<perpage>100</perpage>
<total>19</total>
<photos>
<photo>
<id>ff8080810fc8ac78010fd3f158d40a52</id>
<owner>ff8080810f1a387b010f1a83d6530dfc</owner>
<title>Gmail-2</title>
<host>4</host>
<dir>20061230</dir>
<filename>231905_1463411198</filename>
</photo>
</photos>
</result>
简单的alias一下就可以读到值了
File file = new File("src/test/java/com/jdkcn/test/result.xml");
BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), "UTF-8"));
XStream stream = new XStream();
stream.alias("result", YupooResult.class);
stream.alias("photo",YupooPhoto.class);
YupooResult result = (YupooResult)stream.fromXML(reader);
可是Yupoo的api返回的xmlrpc的结果是这样的
<result page="1" pages="1" perpage="100" total="19">
<photos>
<photo id="ff8080810fc8ac78010fd3f158d40a52"
owner="ff8080810f1a387b010f1a83d6530dfc" title="Gmail-2" host="4"
dir="20061230" filename="231905_1463411198" />
</photos>
</result>
这样就load不到值了。没法去mailist里面找答案，果然有人问。
Hello,
I am not sure about the subject but here is what I needed help for:
XML:
<field name="value">I am a Field.</field>
I have already tried several structures and nothing seem to work.
Is this possible for XStream? :)
How is the Java class form to support this?
Thanks!
有人回答是看Converter的文档。果然找到答案了。
自己写一个converter就可以了。
下面是我的converter
package com.jdkcn.xstream;
import java.util.ArrayList;
import java.util.List;
import com.jdkcn.yupoo.YupooPhoto;
import com.jdkcn.yupoo.YupooResult;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
/**
* @author <a href="mailto:rory.cn@gmail.com">somebody</a>
* @since Jan 16, 2007 6:12:35 PM
* @version $Id YupooResultConverter.java$
*/
public class YupooResultConverter implements Converter {
/* (non-Javadoc)
* @see com.thoughtworks.xstream.converters.Converter#marshal(java.lang.Object, com.thoughtworks.xstream.io.HierarchicalStreamWriter, com.thoughtworks.xstream.converters.MarshallingContext)
*/
public void marshal(Object obj, HierarchicalStreamWriter writer, MarshallingContext context) {
// FIXME unfinish.
}
/* (non-Javadoc)
* @see com.thoughtworks.xstream.converters.Converter#unmarshal(com.thoughtworks.xstream.io.HierarchicalStreamReader, com.thoughtworks.xstream.converters.UnmarshallingContext)
*/
public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
YupooResult result = new YupooResult();
result.setPage(new Integer(reader.getAttribute("page")));
result.setPages(new Integer(reader.getAttribute("pages")));
result.setPerpage(new Integer(reader.getAttribute("perpage")));
result.setTotal(new Integer(reader.getAttribute("total")));
reader.moveDown();
List<YupooPhoto> photos = new ArrayList<YupooPhoto>();
while(reader.hasMoreChildren()) {
reader.moveDown();
YupooPhoto photo = new YupooPhoto();
photo.setDir(reader.getAttribute("dir"));
photo.setFilename(reader.getAttribute("filename"));
photo.setHost(reader.getAttribute("host"));
photo.setId(reader.getAttribute("id"));
photo.setOwner(reader.getAttribute("owner"));
photo.setTitle(reader.getAttribute("title"));
photos.add(photo);
reader.moveUp();
}
result.setPhotos(photos);
return result;
}
/* (non-Javadoc)
* @see com.thoughtworks.xstream.converters.ConverterMatcher#canConvert(java.lang.Class)
*/
public boolean canConvert(Class clazz) {
return clazz.equals(YupooResult.class);
}
}
然后调用的地方修改一下就ok了。
XStream stream = new XStream();
stream.registerConverter(new YupooResultConverter());
stream.alias("result", YupooResult.class);
参考:
http://xstream.codehaus.org/converter-tutorial.html
2007年1月18日更新。
这里感谢网友 的提示。原来新版的xstream可以简单的解决了。在1.2.1的doc里面找到了这个两个方法。
useAttributeFor
public void useAttributeFor(java.lang.String fieldName,
java.lang.Class type)- Use an XML attribute for a field or a specific type.
- Parameters:
fieldName - the name of the field
type - the Class of the type to be rendered as XML attribute
- Throws:
XStream.InitializationException - if no AttributeMapper is available
- Since:
- 1.2
useAttributeFor
public void useAttributeFor(java.lang.Class type)
- Use an XML attribute for an arbotrary type.
- Parameters:
type - the Class of the type to be rendered as XML attribute
- Throws:
XStream.InitializationException - if no AttributeMapper is available
- Since:
- 1.2
这两个方法都是从1.2开始支持的。
也不用自己写converter了。这样就可以了
stream.alias("result", YupooResult.class);
stream.useAttributeFor("page", Integer.class);
stream.useAttributeFor("pages", Integer.class);
stream.useAttributeFor("perpage", Integer.class);
stream.useAttributeFor("total", Integer.class);
stream.alias("photo", YupooPhoto.class);
stream.useAttributeFor("id", String.class);
stream.useAttributeFor("owner", String.class);
stream.useAttributeFor("title", String.class);
stream.useAttributeFor("host", String.class);
stream.useAttributeFor("dir", String.class);
stream.useAttributeFor("filename", String.class);
除经特别注明外,本文章版权归
莫多泡泡所有.
署名,非商业用途,保持一致. somebody(莫多)
posted on 2007-01-17 18:24
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