微信公众平台开发中-SAE不支持XStream框架的解决方案

  1 [java] view plain copy
  2  
  3 package org.liufeng.course.util;  
  4   
  5 import java.io.InputStream;  
  6 import java.io.Writer;  
  7 import java.util.HashMap;  
  8 import java.util.List;  
  9 import java.util.Map;  
 10   
 11 import javax.servlet.http.HttpServletRequest;  
 12   
 13 import org.dom4j.Document;  
 14 import org.dom4j.Element;  
 15 import org.dom4j.io.SAXReader;  
 16 import org.liufeng.course.message.resp.Article;  
 17 import org.liufeng.course.message.resp.MusicMessage;  
 18 import org.liufeng.course.message.resp.NewsMessage;  
 19 import org.liufeng.course.message.resp.TextMessage;  
 20   
 21 import com.thoughtworks.xstream.XStream;  
 22 import com.thoughtworks.xstream.core.util.QuickWriter;  
 23 import com.thoughtworks.xstream.io.HierarchicalStreamWriter;  
 24 import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;  
 25 import com.thoughtworks.xstream.io.xml.XppDriver;  
 26   
 27 /** 
 28  * 消息工具类 
 29  *  
 30  * @author liufeng 
 31  * @date 2013-05-19 
 32  */  
 33 public class MessageUtil {  
 34   
 35     /** 
 36      * 返回消息类型：文本 
 37      */  
 38     public static final String RESP_MESSAGE_TYPE_TEXT = "text";  
 39   
 40     /** 
 41      * 返回消息类型：音乐 
 42      */  
 43     public static final String RESP_MESSAGE_TYPE_MUSIC = "music";  
 44   
 45     /** 
 46      * 返回消息类型：图文 
 47      */  
 48     public static final String RESP_MESSAGE_TYPE_NEWS = "news";  
 49   
 50     /** 
 51      * 请求消息类型：文本 
 52      */  
 53     public static final String REQ_MESSAGE_TYPE_TEXT = "text";  
 54   
 55     /** 
 56      * 请求消息类型：图片 
 57      */  
 58     public static final String REQ_MESSAGE_TYPE_IMAGE = "image";  
 59   
 60     /** 
 61      * 请求消息类型：链接 
 62      */  
 63     public static final String REQ_MESSAGE_TYPE_LINK = "link";  
 64   
 65     /** 
 66      * 请求消息类型：地理位置 
 67      */  
 68     public static final String REQ_MESSAGE_TYPE_LOCATION = "location";  
 69   
 70     /** 
 71      * 请求消息类型：音频 
 72      */  
 73     public static final String REQ_MESSAGE_TYPE_VOICE = "voice";  
 74   
 75     /** 
 76      * 请求消息类型：推送 
 77      */  
 78     public static final String REQ_MESSAGE_TYPE_EVENT = "event";  
 79   
 80     /** 
 81      * 事件类型：subscribe(订阅) 
 82      */  
 83     public static final String EVENT_TYPE_SUBSCRIBE = "subscribe";  
 84   
 85     /** 
 86      * 事件类型：unsubscribe(取消订阅) 
 87      */  
 88     public static final String EVENT_TYPE_UNSUBSCRIBE = "unsubscribe";  
 89   
 90     /** 
 91      * 事件类型：CLICK(自定义菜单点击事件) 
 92      */  
 93     public static final String EVENT_TYPE_CLICK = "CLICK";  
 94   
 95     /** 
 96      * 解析微信发来的请求（XML） 
 97      *  
 98      * @param request 
 99      * @return 
100      * @throws Exception 
101      */  
102     @SuppressWarnings("unchecked")  
103     public static Map<String, String> parseXml(HttpServletRequest request) throws Exception {  
104         // 将解析结果存储在HashMap中  
105         Map<String, String> map = new HashMap<String, String>();  
106   
107         // 从request中取得输入流  
108         InputStream inputStream = request.getInputStream();  
109         // 读取输入流  
110         SAXReader reader = new SAXReader();  
111         Document document = reader.read(inputStream);  
112         // 得到xml根元素  
113         Element root = document.getRootElement();  
114         // 得到根元素的所有子节点  
115         List<Element> elementList = root.elements();  
116   
117         // 遍历所有子节点  
118         for (Element e : elementList)  
119             map.put(e.getName(), e.getText());  
120   
121         // 释放资源  
122         inputStream.close();  
123         inputStream = null;  
124   
125         return map;  
126     }  
127   
128     /** 
129      * 文本消息对象转换成xml 
130      *  
131      * @param textMessage 文本消息对象 
132      * @return xml 
133      */  
134     public static String textMessageToXml(TextMessage textMessage) {  
135         xstream.alias("xml", textMessage.getClass());  
136         return xstream.toXML(textMessage);  
137     }  
138   
139     /** 
140      * 音乐消息对象转换成xml 
141      *  
142      * @param musicMessage 音乐消息对象 
143      * @return xml 
144      */  
145     public static String musicMessageToXml(MusicMessage musicMessage) {  
146         xstream.alias("xml", musicMessage.getClass());  
147         return xstream.toXML(musicMessage);  
148     }  
149   
150     /** 
151      * 图文消息对象转换成xml 
152      *  
153      * @param newsMessage 图文消息对象 
154      * @return xml 
155      */  
156     public static String newsMessageToXml(NewsMessage newsMessage) {  
157         xstream.alias("xml", newsMessage.getClass());  
158         xstream.alias("item", new Article().getClass());  
159         return xstream.toXML(newsMessage);  
160     }  
161   
162     /** 
163      * 扩展xstream，使其支持CDATA块 
164      *  
165      * @date 2013-05-19 
166      */  
167     private static XStream xstream = new XStream(new XppDriver() {  
168         public HierarchicalStreamWriter createWriter(Writer out) {  
169             return new PrettyPrintWriter(out) {  
170                 // 对所有xml节点的转换都增加CDATA标记  
171                 boolean cdata = true;  
172   
173                 @SuppressWarnings("unchecked")  
174                 public void startNode(String name, Class clazz) {  
175 super.startNode(name, clazz);  
176                 }  
177   
178                 protected void writeText(QuickWriter writer, String text) {  
179 if (cdata) {  
180     writer.write("<![CDATA[");  
181     writer.write(text);  
182     writer.write("]]>");  
183 } else {  
184     writer.write(text);  
185 }  
186                 }  
187             };  
188         }  
189     });  
190 }