微信公众平台开发教程1

工程项目图

WeixinServlet

package com.weixin.servlet;import java.io.IOException;import java.io.PrintWriter;import java.util.Date;import java.util.Map;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.weixin.po.TextMessage;import com.weixin.util.CheckUtil;import com.weixin.util.MessageUtil;public class WeixinServlet extends HttpServlet {    private static final long serialVersionUID = 1L;    public WeixinServlet() {        super();    }    protected void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        String signature = request.getParameter("signature");        String timestamp = request.getParameter("timestamp");        String nonce = request.getParameter("nonce");        String echostr = request.getParameter("echostr");        PrintWriter out = response.getWriter();        if (CheckUtil.checkSignature(signature, timestamp, nonce)) {            out.print(echostr);        }    }    protected void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        request.setCharacterEncoding("utf-8");        response.setCharacterEncoding("utf-8");        PrintWriter out = response.getWriter();        try {            Map<String, String> map = MessageUtil.xmlToMap(request);            String fromUserName = map.get("FromUserName");            String toUserName = map.get("ToUserName");            String msgType = map.get("MsgType");            String content = map.get("Content");            String message = null;            if ("text".equals(msgType)) {                TextMessage text = new TextMessage();                text.setFromUserName(toUserName);                text.setToUserName(fromUserName);                text.setMsgType("text");                text.setCreateTime(new Date().getTime());                text.setContent("你发送 的消息是：" + content);                message = MessageUtil.textMessageToXml(text);            }            out.print(message);        } catch (Exception e) {            // TODO: handle exception        } finally {            out.close();        }    }}

TextMessage

package com.weixin.po;public class TextMessage {private String ToUserName;private String FromUserName;private long CreateTime;private String MsgType;private String Content;private String MsgId;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;}public String getContent() {    return Content;}public void setContent(String content) {    Content = content;}public String getMsgId() {    return MsgId;}public void setMsgId(String msgId) {    MsgId = msgId;}}

CheckUtil

package com.weixin.util;import java.io.UnsupportedEncodingException;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.util.Arrays;public class CheckUtil {    private static final String token = "weixin";    public static boolean checkSignature(String signature, String timestamp, String nonce) {        String[] args = new String[] { token, timestamp, nonce };        Arrays.sort(args);        StringBuffer content = new StringBuffer();        for (int i = 0; i < args.length; i++) {            content.append(args[i]);        }        // 加密        String temp = getSha1(content.toString());        return temp.equals(signature);    }    public static String getSha1(String str) {        if (str == null || str.length() == 0) {            return null;        }        char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };        try {            MessageDigest mdTemp = MessageDigest.getInstance("SHA1");            mdTemp.update(str.getBytes("UTF-8"));            byte[] md = mdTemp.digest();            int j = md.length;            char buf[] = new char[j * 2];            int k = 0;            for (int i = 0; i < j; i++) {                byte byte0 = md[i];                buf[k++] = hexDigits[byte0 >>> 4 & 0xf];                buf[k++] = hexDigits[byte0 & 0xf];            }            return new String(buf);        } catch (NoSuchAlgorithmException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (UnsupportedEncodingException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return null;    }}

MessageUtil

package com.weixin.util;import java.io.IOException;import java.io.InputStream;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.servlet.http.HttpServletRequest;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.SAXReader;import com.thoughtworks.xstream.XStream;import com.weixin.po.TextMessage;public class MessageUtil {    public static Map<String,String> xmlToMap(HttpServletRequest request){        Map<String,String> map=new HashMap<String,String>();        SAXReader read=new SAXReader();        try {            InputStream ins=request.getInputStream();            Document doc =read.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;        } catch (IOException | DocumentException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return null;    }    public static String textMessageToXml(TextMessage textMessage){        XStream xStream=new XStream();        xStream.alias("xml", textMessage.getClass());         return xStream.toXML(textMessage);    }}

web.xml文件配置

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">  <display-name>weixin</display-name>  <welcome-file-list>    <welcome-file>index.html</welcome-file>    <welcome-file>index.htm</welcome-file>    <welcome-file>index.jsp</welcome-file>    <welcome-file>default.html</welcome-file>    <welcome-file>default.htm</welcome-file>    <welcome-file>default.jsp</welcome-file>  </welcome-file-list>  <servlet>    <servlet-name>weixinservlet</servlet-name>    <servlet-class>com.weixin.servlet.WeixinServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>weixinservlet</servlet-name>    <url-pattern>/WeixinServlet</url-pattern>  </servlet-mapping></web-app>

微信公众平台的配置

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课程结束