接上一讲，微信公众号开发（1）——服务器配置
新建几个信息类：
package com.imooc.po;/*** 信息基类* @author lyj**/public class BaseMessage {private String ToUserName;private String FromUserName;private Long CreateTime;private String MsgType;public String getToUserName() {return ToUserName;}public void setToUserName(String toUserName) {ToUserName = toUserName;}public String getFromUserName() {return FromUserName;}public void setFromUserName(String fromUserName) {FromUserName = fromUserName;}public Long getCreateTime() {return CreateTime;}public void setCreateTime(Long createTime) {CreateTime = createTime;}public String getMsgType() {return MsgType;}public void setMsgType(String msgType) {MsgType = msgType;}}
package com.imooc.po;/*** 文本消息类封装* @author lyj**/public class TextMessage extends BaseMessage{private String Content;private String MsgId;public String getContent() {return Content;}public void setContent(String content) {Content = content;}public String getMsgId() {return MsgId;}public void setMsgId(String msgId) {MsgId = msgId;}}
package com.imooc.po;/*** 图文消息类* @author lyj**/public class News {private String Title;private String Description;private String PicUrl;private String Url;public String getTitle() {return Title;}public void setTitle(String title) {Title = title;}public String getDescription() {return Description;}public void setDescription(String description) {Description = description;}public String getPicUrl() {return PicUrl;}public void setPicUrl(String picUrl) {PicUrl = picUrl;}public String getUrl() {return Url;}public void setUrl(String url) {Url = url;}}
package com.imooc.po;import java.util.List;public class NewsMessage extends BaseMessage{private int ArticleCount;private List<News> Articles;public int getArticleCount() {return ArticleCount;}public void setArticleCount(int articleCount) {ArticleCount = articleCount;}public List<News> getArticles() {return Articles;}public void setArticles(List<News> articles) {Articles = articles;}}
需要的jar包：
MessageUtil.java工具类的详细代码：
package com.imooc.util;import java.io.InputStream;import java.util.ArrayList;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.servlet.http.HttpServletRequest;import org.dom4j.Document;import org.dom4j.Element;import org.dom4j.io.SAXReader;import com.imooc.po.News;import com.imooc.po.NewsMessage;import com.imooc.po.TextMessage;import com.thoughtworks.xstream.XStream;public class MessageUtil {public static final String MESSAGE_TEXT="text";public static final String MESSAGE_NEWS="news";public static final String MESSAGE_IMAGE="image";public static final String MESSAGE_VOICE="voice";public static final String MESSAGE_VIDEO="video";public static final String MESSAGE_LINK="link";public static final String MESSAGE_LOCARION="location";public static final String MESSAGE_EVENT="event";public static final String MESSAGE_SUBSCRIBE="subscribe";public static final String MESSAGE_CLICK="CLICK";public static final String MESSAGE_VIEW="VIEW";/*** xml文件转换为Map集合* @param request* @return* @throws Exception*/public static Map<String,String> xmlToMap(HttpServletRequest request)throws Exception{Map<String,String>map=new HashMap<String,String>();SAXReader reader=new SAXReader();InputStream ins=request.getInputStream();Document doc=reader.read(ins);Element root=doc.getRootElement();List<Element>list=root.elements();for(Element e:list) {map.put(e.getName(),e.getText());}ins.close();return map;}/*** 将文本对象转换为xml* @param textMessage* @return*/public static String textMessageToXml(TextMessage textMessage) {XStream xstream=new XStream();xstream.alias("xml", textMessage.getClass());return xstream.toXML(textMessage);}/*** 将图文消息转换为xml* @param newsMessage* @return*/public static String newsMessageToXml(NewsMessage newsMessage) {XStream xstream=new XStream();xstream.alias("xml", newsMessage.getClass());//将根节点转换为<xml></xml>xstream.alias("item", new News().getClass());return xstream.toXML(newsMessage);}public static String initText(String toUserName,String fromUserName,String content) {TextMessage text=new TextMessage();text.setFromUserName(toUserName);text.setToUserName(fromUserName);text.setMsgType(MessageUtil.MESSAGE_TEXT);text.setCreateTime(new Date().getTime());text.setContent(content);return textMessageToXml(text);}/***主 菜单* @return*/public static String menuText() {StringBuffer sb=new StringBuffer();sb.append("欢迎您的关注，请按照菜单提示开始操作:\n\n");sb.append("1:朱一龙介绍\n");sb.append("2:朱一龙出演过的作品\n\n");sb.append("回复？调出此菜单.");return sb.toString();}public static String firstMenu() { //用户输入“1"时服务器回复的消息StringBuffer sb=new StringBuffer();sb.append("朱一龙，1988年4月16日出生于湖北武汉，中国内地男演员，毕业于北京电影学院级表演系本科。");return sb.toString();}public static String secondMenu() { //用户输入"2"时回复的消息StringBuffer sb=new StringBuffer();sb.append("出演首部电影《再生缘》，后参演多部《周末王刚讲故事》（又名：《儿女传奇》）系列数字电影；参演古装系列电影《大明嫔妃》 [1] ；在家庭情感轻喜剧《家宴》中饰演冯豆子 [2] ；在民国爱情剧《情定三生》中饰演豪门少爷迟瑞，随后，凭借该角色于1月26日获得亚洲影响力东方盛典最具潜力男演员奖；因在古装历史剧《芈月传》中饰演秦昭襄王嬴稷而受到广泛关注 [3] ；2月，在古装武侠剧《新萧十一郎》中饰演风采翩翩、文武兼备的无垢山庄少庄主连城璧 [4] ；7月，在武侠小说《新边城浪子》中饰演黑衣黑刀傅红雪 [5] 。，主演年代爱情剧《许你浮生若梦》 [6] 。6月主演奇幻网络剧《镇魂》，分饰沈巍、夜尊、黑袍使三角，凭借精湛演绎人气飙升，同时为该剧演唱推广曲《时间飞行》 [7-8] 。10月，悬疑冒险剧《盗墓笔记重启》开机，饰演吴邪。");return sb.toString();}/*** 图文消息的组装* @param toUserName* @param fromUserName* @return*/public static String initNewsMessage(String toUserName,String fromUserName) {String message=null;List<News> newsList=new ArrayList<News>();NewsMessage newsMessage=new NewsMessage();News news=new News();news.setTitle("朱一龙");news.setDescription("4月，在电影《再生缘》中饰演刺客阮应");news.setPicUrl("http://example./WeiXin/image/朱一龙.jpg");news.setUrl("");News news2=new News();news2.setTitle("朱哥");news2.setDescription("当公众号具备留言功能以留言，或仅公众号粉丝可以留言）。");news2.setPicUrl("http://example./WeiXin/image/jiajingwen-001.jpg");news2.setUrl("");newsList.add(news);newsList.add(news2);newsMessage.setToUserName(fromUserName);newsMessage.setFromUserName(toUserName);newsMessage.setCreateTime(new Date().getTime());newsMessage.setMsgType(MESSAGE_NEWS);newsMessage.setArticles(newsList);newsMessage.setArticleCount(newsList.size());message=newsMessageToXml(newsMessage);return message;}}
WeixinServlet.java里面添加doPost相关代码：
@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {resp.setCharacterEncoding("UTF-8");req.setCharacterEncoding("utf-8");PrintWriter out=resp.getWriter();Map<String, String> map;try {map = MessageUtil.xmlToMap(req);String FromUserName=map.get("FromUserName");String ToUserName=map.get("ToUserName");String MsgType=map.get("MsgType");String Content=map.get("Content");String message=null;if(MessageUtil.MESSAGE_TEXT.equals(MsgType)) {if("1".equals(Content)){message=MessageUtil.initText(ToUserName, FromUserName, MessageUtil.firstMenu());}else if("2".equals(Content)) {message=MessageUtil.initNewsMessage(ToUserName, FromUserName);}else if("?".equals(Content)||"？".equals(Content)) {message=MessageUtil.initText(ToUserName, FromUserName, MessageUtil.menuText());}else {message=MessageUtil.initText(ToUserName, FromUserName, "晴晴，能不能好好输，别乱输");}/*TextMessage text=new TextMessage();text.setFromUserName(ToUserName);text.setToUserName(FromUserName);text.setMsgType("text");text.setCreateTime(new Date().getTime());text.setContent("您发送的消息是："+Content);message=MessageUtil.textMessageToXml(text); */}else if((MessageUtil.MESSAGE_EVENT.equals(MsgType))) {String eventType=map.get("Event");if(MessageUtil.MESSAGE_SUBSCRIBE.equals(eventType)) {message=MessageUtil.initText(ToUserName, FromUserName, MessageUtil.menuText());}}System.out.println(message);out.print(message);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}finally {out.close();}}
至此，大功告成，用户输入相应的数字或字符，微信后台就可以回复对应的文本消息和图文消息了。
