报错的信息为：The type org.xmlpull.v1.XmlPullParser cannot be resolved.

/**
* 扩展XStream 支持CDATA
*/
private static XStream xstream = new XStream(new XppDriver(){
public HierarchicalStreamWriter createWriter(Writer out) {
return new PrettyPrintWriter(out){
//对所有XML节点的转换添加CDATA标志
boolean cdata =true;
@SuppressWarnings("unchecked")
public void starNode(String name,Class clazz) {
super.startNode(name,clazz);

}
protected void writeText(QuickWriter writer,String text) {
if(cdata){
writer.write("<![CDATA[");
writer.write(text);
writer.write("]]>");
}else {
writer.write(text);
}

}
};
}
});
/**
* 文本消息对象转换为xml
* @param textMessage 文本消息对象
* @return
*/
public static String messageToXml(TextMessage textMessage) {
xstream.alias("xml",textMessage.getClass());
return xstream.toXML(textMessage);
}
/**
* 图片消息对象转换为xml
* @param imageMessage 图片消息对象
* @return
*/
public static String messageToXml(ImageMessage imageMessage) {
xstream.alias("xml",imageMessage.getClass());
return xstream.toXML(imageMessage);
}


/**
* 语音消息对象转换为xml
* @param voiceMessage 语音消息对象
* @return
*/
public static String messageToXml(VoiceMessage voiceMessage) {
xstream.alias("xml",voiceMessage.getClass());
return xstream.toXML(voiceMessage);
}
/**
* 视频消息对象转换为xml
* @param videoMessage 视频消息对象
* @return
*/
public static String messageToXml(VideoMessage videoMessage) {
xstream.alias("xml",videoMessage.getClass());
return xstream.toXML(videoMessage);
}
/**
* 音乐消息对象转换为xml
* @param musicMessage 音乐消息对象
* @return
*/
public static String messageToXml(MusicMessage musicMessage) {
xstream.alias("xml",musicMessage.getClass());
return xstream.toXML(musicMessage);
}
/**
* 图文消息对象转换为xml
* @param newsMessage 图文消息对象
* @return
*/
public static String messageToXml(NewsMessage newsMessage) {
xstream.alias("xml",newsMessage.getClass());
xstream.alias("item",new Article().getClass());
return xstream.toXML(newsMessage);
}
}

处理的方法就是

在当前类的第一行（package位置）会提示：Multiple markers at this line

- The type org.xmlpull.v1.XmlPullParser cannot be resolved. It is indirectly referenced from required .class files
- The type org.xmlpull.v1.XmlPullParser cannot be resolved. It is indirectly referenced from required .class files
- The type org.xmlpull.v1.XmlPullParserException cannot be resolved. It is indirectly referenced from
required .class files

这样的信息，这是因为XStream只是一个jar文件，但是它里面会依赖一个jar包，依赖的jar包是：xmlpull_1_0_5.jar、只要把这个jar包引入之后，问题即可解决！