1.設(shè)置成為開發(fā)者模式
登錄微信工作平臺(tái)，選擇高級(jí)功能-進(jìn)入開發(fā)模式，成為開發(fā)者。需要做如下圖配置。URL配置的信息是指，微信的后臺(tái)服務(wù)器把您的用戶消息發(fā)送到該URL處理。Token是你和微信之間的一個(gè)密碼，用來驗(yàn)證消息是否是從微信的服務(wù)發(fā)送而來，而不是其他來攻擊你的系統(tǒng)。
現(xiàn)在你還不能設(shè)置，在設(shè)置時(shí)微信會(huì)GET請求你設(shè)置的URL，已檢測接口是否可以使用。只有等你準(zhǔn)備好GET方法之后才可以進(jìn)行設(shè)置。
2.實(shí)現(xiàn)GET方法
從文檔中知道，我們需要實(shí)現(xiàn)POST和GET方法，GET方法用于驗(yàn)證微信和你的通訊驗(yàn)證，POST用于消息處理。
新建Servlet HelloWeChat，先實(shí)現(xiàn)其中的GET方法
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO 為了簡單起見,先不對(duì)消息來源進(jìn)行校驗(yàn)
response.setContentType("text/html;charset=UTF-8");
PrintWriter pw = response.getWriter();
String echo = request.getParameter("echostr");
echo = new String(echo.getBytes("ISO-8859-1"),"UTF-8");
pw.println(echo);
}
可以在本地使用http://localhost:8080/QiyadengWeb/HelloWeChat?echostr=hello中文，先進(jìn)行測試，如果沒有問題，可以部署到服務(wù)器上，然后在微信公眾平臺(tái)進(jìn)行設(shè)置了。
3.實(shí)現(xiàn)POST方法
POST方法首先接收到微信公眾平臺(tái)傳送過來的XML，從中提取消息發(fā)送人和消息內(nèi)容。更加消息發(fā)送內(nèi)容，你可以增加自己的處理邏輯，最后拼裝成回復(fù)消息XML，返回給微信公眾平臺(tái)。
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter pw = response.getWriter();
String wxMsgXml = IOUtils.toString(request.getInputStream(),"utf-8");
WeChatTextMessage textMsg = null;
try {
textMsg = getWeChatTextMessage(wxMsgXml);
} catch (Exception e) {
e.printStackTrace();
}
StringBuffer replyMsg = new StringBuffer();
if(textMsg != null){
//增加你所需要的處理邏輯，這里只是簡單重復(fù)消息
replyMsg.append("您給我的消息是：");
replyMsg.append(textMsg.getContent());
}
else{
replyMsg.append(":)不是文本的消息，我暫時(shí)看不懂");
}
String returnXml = getReplyTextMessage(replyMsg.toString(), textMsg.getFromUserName());
pw.println(returnXml);
}
關(guān)于調(diào)試，這里推薦一個(gè)工具Fiddler，你可以模擬微信的POST消息到你的本地，而不必每次部署到服務(wù)器上進(jìn)行調(diào)試。關(guān)于Fiddler的POST數(shù)據(jù)使用方法，可以參考下圖標(biāo)注內(nèi)容。
4.部署并測試
完成第一步，并和你的公眾帳號(hào)好進(jìn)行對(duì)話，回復(fù)消息沒有問題的話，那就恭喜你了
。
5.依賴庫
使用maven的同學(xué)，添加以下依賴即可。非maven用戶，找到這些庫添加到buider path中即可。
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-io</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
<version>1.4.3</version>
</dependency>
6.完整的代碼
package com.qiyadeng.wechat;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.IOUtils;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.DomDriver;
/**
* Servlet implementation class HelloWeChat
*/
public class HelloWeChat extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public HelloWeChat() {
super();
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO 為了簡單起見,先不對(duì)消息來源進(jìn)行校驗(yàn)
response.setContentType("text/html;charset=UTF-8");
PrintWriter pw = response.getWriter();
String echo = request.getParameter("echostr");
echo = new String(echo.getBytes("ISO-8859-1"),"UTF-8");
pw.println(echo);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter pw = response.getWriter();
String wxMsgXml = IOUtils.toString(request.getInputStream(),"utf-8");
WeChatTextMessage textMsg = null;
try {
textMsg = getWeChatTextMessage(wxMsgXml);
} catch (Exception e) {
e.printStackTrace();
}
StringBuffer replyMsg = new StringBuffer();
if(textMsg != null){
//增加你所需要的處理邏輯，這里只是簡單重復(fù)消息
replyMsg.append("您給我的消息是：");
replyMsg.append(textMsg.getContent());
}
else{
replyMsg.append(":)不是文本的消息，我暫時(shí)看不懂");
}
String returnXml = getReplyTextMessage(replyMsg.toString(), textMsg.getFromUserName());
pw.println(returnXml);
}
private WeChatTextMessage getWeChatTextMessage(String xml){
XStream xstream = new XStream(new DomDriver());
xstream.alias("xml", WeChatTextMessage.class);
xstream.aliasField("ToUserName", WeChatTextMessage.class, "toUserName");
xstream.aliasField("FromUserName", WeChatTextMessage.class, "fromUserName");
xstream.aliasField("CreateTime", WeChatTextMessage.class, "createTime");
xstream.aliasField("MsgType", WeChatTextMessage.class, "messageType");
xstream.aliasField("Content", WeChatTextMessage.class, "content");
xstream.aliasField("MsgId", WeChatTextMessage.class, "msgId");
WeChatTextMessage wechatTextMessage = (WeChatTextMessage)xstream.fromXML(xml);
return wechatTextMessage;
}
private String getReplyTextMessage(String content, String weChatUser){
WeChatReplyTextMessage we = new WeChatReplyTextMessage();
we.setMessageType("text");
we.setFuncFlag("0");
we.setCreateTime(new Long(new Date().getTime()).toString());
we.setContent(content);
we.setToUserName(weChatUser);
we.setFromUserName("shanghaiweather");//TODO 你的公眾帳號(hào)微信號(hào)
XStream xstream = new XStream(new DomDriver());
xstream.alias("xml", WeChatReplyTextMessage.class);
xstream.aliasField("ToUserName", WeChatReplyTextMessage.class, "toUserName");
xstream.aliasField("FromUserName", WeChatReplyTextMessage.class, "fromUserName");
xstream.aliasField("CreateTime", WeChatReplyTextMessage.class, "createTime");
xstream.aliasField("MsgType", WeChatReplyTextMessage.class, "messageType");
xstream.aliasField("Content", WeChatReplyTextMessage.class, "content");
xstream.aliasField("FuncFlag", WeChatReplyTextMessage.class, "funcFlag");
String xml =xstream.toXML(we);
return xml;
}
}