微信公众平台开发之token验证和消息处理的示例分析

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/** * * @Description: 微信消息处理以及用户分组 */public class WeiXinMessageAction extends BaseAction{    /**     *     */    private static final long serialVersionUID = 1L;           private IFeWeiXinMessageService weiXinExternalService;           private String wxNo;           public String responseMessgaeInfo(){        Boolean isGet = request.getMethod().equalsIgnoreCase("GET");        if(isGet){            validateSignature();        }else{            saveWxMessage();        }        return null;    }    /**     *     * @Description: 接收post保存接受的消息 只保存MsgType类型为text信息     * @param        * @return void     * @throws     */    private void saveWxMessage(){        InputStream inputStream;        try {            request.setCharacterEncoding("UTF-8");            Document doc = null;            SAXReader reader = new SAXReader();            inputStream = request.getInputStream();            doc = reader.read(inputStream);            Element root = doc.getRootElement();            String toUserName = root.element("ToUserName").getTextTrim();            String fromUserName = root.element("FromUserName").getTextTrim();            String content = root.element("Content").getTextTrim();            String msgType=root.element("MsgType").getTextTrim();            String msgId=root.element("MsgId").getTextTrim();            String createTime=root.element("CreateTime").getTextTrim();            //只保存文本消息            //时间            System.out.println("接收消息内容:"+content+"-----------------msgType:"+msgType);            if(WeiXinMsgType.TEXT.type.equals(msgType)){                weiXinExternalService.addWxMessage(toUserName, fromUserName, content, msgType, msgId, formatTime(createTime));            }        } catch (Exception e) {            e.printStackTrace();        }    }           /**     *     * @Description: 传入的CreateTime转换成long类型     * @param @param createTime     * @param @return       * @return Date     * @throws     */    private   Date formatTime(String createTime) {        long msgCreateTime = Long.parseLong(createTime) * 1000L;        return new Date(msgCreateTime);    }           /**     *     * @Description: 校验微信签名     * @param        * @return void     * @throws     */    private void validateSignature(){        PrintWriter out = null;        try {            String signature = request.getParameter("signature");            String timestamp = request.getParameter("timestamp");            String nonce = request.getParameter("nonce");            out = response.getWriter();            if (checkSignature(signature, timestamp, nonce)) {                out.print(request.getParameter("echostr"));            }        } catch (Exception e) {            e.printStackTrace();        } finally {            out.close();            out = null;        }    }           /**     *     * @Description: 判断token是否合法     * @param @param signature     * @param @param timestamp     * @param @param nonce     * @param @return       * @return boolean     * @throws     */    private  boolean checkSignature(String signature, String timestamp, String nonce) {            //根据微信账号获取token并校验            Map map=new HashMap();            map.put("wxNo", wxNo);            WeiXinMasterConfig  masterConfig= weiXinExternalService.selectWeiXinMasterConfig(map);            if(masterConfig==null){                return false;            }            String[] arr = new String[] {masterConfig.getWxToken(), timestamp, nonce };            Arrays.sort(arr);            StringBuilder content = new StringBuilder();            for (int i = 0; i < arr.length; i++) {                content.append(arr[i]);            }            MessageDigest md = null;            String tmpStr = null;            try {                md = MessageDigest.getInstance("SHA-1");                byte[] digest = md.digest(content.toString().getBytes());                tmpStr = byteToStr(digest);            } catch (NoSuchAlgorithmException e) {                e.printStackTrace();            }            content = null;            return tmpStr != null ? tmpStr.equals(signature.toUpperCase()) : false;    }    // 将字节转换为十六进制字符串    private static String byteToHexStr(byte ib) {        char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A',                'B', 'C', 'D', 'E', 'F' };        char[] ob = new char[2];        ob[0] = Digit[(ib >>> 4) & 0X0F];        ob[1] = Digit[ib & 0X0F];        String s = new String(ob);        return s;    }    // 将字节数组转换为十六进制字符串    private static String byteToStr(byte[] bytearray) {        String strDigest = "";        for (int i = 0; i < bytearray.length; i++) {            strDigest += byteToHexStr(bytearray[i]);        }        return strDigest;    }

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