springboot开发微信公众号自动回复(一)

需要导入maven：

<!--解析xml-->
<dependency>
   <groupId>dom4j</groupId>
   <artifactId>dom4j</artifactId>
   <version>1.6.1</version>
</dependency>

<dependency>
   <groupId>com.thoughtworks.xstream</groupId>
   <artifactId>xstream</artifactId>
   <version>1.4.11.1</version>
</dependency>


<!--微信jar结束-->

1.建立一个微信后台控制层

@RestController
public class WxController {

    @Autowired
    private MessageDispatcher messageDispatcher;

    @GetMapping("/wx")
    public void login(HttpServletRequest request, HttpServletResponse response) throws UnsupportedEncodingException {
        request.setCharacterEncoding("UTF-8");
        String signature = request.getParameter("signature");
        String timestamp = request.getParameter("timestamp");
        String nonce = request.getParameter("nonce");
        String echostr = request.getParameter("echostr");
        PrintWriter out = null;
        try {
            out = response.getWriter();
            if (CheckUtil.checkSignature(signature, timestamp, nonce)) {
                out.write(echostr);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            out.close();
        }
    }
    @PostMapping(value = "/wx",produces = "application/xml;charset=utf-8")
    public String handler(HttpServletRequest request, HttpServletResponse response) throws Exception {
        request.setCharacterEncoding("UTF-8");
     /*   //将微信请求xml转为map格式，获取所需的参数
        Map<String,String> mapJieshou = MessageUtil.xmlToMap(request);
        String Content = mapJieshou.get("Content");*/

        Map<String, String> map = WxController.parseXml(request);
        String msgType = map.get("MsgType");
        if (MessageUtil.REQ_MESSAGE_TYPE_EVENT.equals(msgType)) {
            return messageDispatcher.processEvent(map);
        }else{
            return messageDispatcher.processMessage(map);
        }
    }
/*    @PostMapping("/wx")
    public void handler(HttpServletRequest request, HttpServletResponse response) throws Exception {
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        PrintWriter out = response.getWriter();
        Map<String, String> parseXml = WxController.parseXml(request);
        String msgType = parseXml.get("MsgType");
        String content = parseXml.get("Content");
        String fromusername = parseXml.get("FromUserName");
        String tousername = parseXml.get("ToUserName");
        System.out.println(msgType);
        System.out.println(content);
        System.out.println(fromusername);
        System.out.println(tousername);
    }*/
    public static Map<String, String> parseXml(HttpServletRequest request) throws Exception {
        Map<String, String> map = new HashMap<String, String>();
        InputStream inputStream = request.getInputStream();
        SAXReader reader = new SAXReader();
        Document document = reader.read(inputStream);
        Element root = document.getRootElement();
        List<Element> elementList = root.elements();
        for (Element e : elementList)
            map.put(e.getName(), e.getText());
        inputStream.close();
        return map;
    }

}

2建立后台：

@Component
public class MessageDispatcher {
    public static String processMessage(Map<String, String> map) {
        String openid = map.get("FromUserName"); //用户 openid
        String mpid = map.get("ToUserName");   //公众号原始 ID
        String content = map.get("Content");
        if (map.get("MsgType").equals(MessageUtil.REQ_MESSAGE_TYPE_TEXT)) {
            //普通文本消息
            TextMessage txtmsg = new TextMessage();
            txtmsg.setToUserName(openid);
            txtmsg.setFromUserName(mpid);
            txtmsg.setCreateTime(new Date().getTime());
            txtmsg.setMsgType(MessageUtil.RESP_MESSAGE_TYPE_TEXT);
           
                txtmsg.setContent("您输入的是:"+content);
       
            return MessageUtil.textMessageToXml(txtmsg);
        }
        return null;
    }
    public String processEvent(Map<String, String> map) {
        //在这里处理事件
        return "123";
    }
}

3建立后台MessageUtil

public class MessageUtil {
    /**
     * 返回消息类型：文本
     */
    public static final String RESP_MESSAGE_TYPE_TEXT = "text";
    /**
     * 返回消息类型：音乐
     */
    public static final String RESP_MESSAGE_TYPE_MUSIC = "music";
    /**
     * 返回消息类型：图文
     */
    public static final String RESP_MESSAGE_TYPE_NEWS = "news";
    /**
     * 返回消息类型：图片
     */
    public static final String RESP_MESSAGE_TYPE_Image = "image";
    /**
     * 返回消息类型：语音
     */
    public static final String RESP_MESSAGE_TYPE_Voice = "voice";
    /**
     * 返回消息类型：视频
     */
    public static final String RESP_MESSAGE_TYPE_Video = "video";
    /**
     * 请求消息类型：文本
     */
    public static final String REQ_MESSAGE_TYPE_TEXT = "text";
    /**
     * 请求消息类型：图片
     */
    public static final String REQ_MESSAGE_TYPE_IMAGE = "image";
    /**
     * 请求消息类型：链接
     */
    public static final String REQ_MESSAGE_TYPE_LINK = "link";
    /**
     * 请求消息类型：地理位置
     */
    public static final String REQ_MESSAGE_TYPE_LOCATION = "location";
    /**
     * 请求消息类型：音频
     */
    public static final String REQ_MESSAGE_TYPE_VOICE = "voice";
    /**
     * 请求消息类型：视频
     */
    public static final String REQ_MESSAGE_TYPE_VIDEO = "video";
    /**
     * 请求消息类型：推送
     */
    public static final String REQ_MESSAGE_TYPE_EVENT = "event";
    /**
     * 事件类型：subscribe(订阅)
     */
    public static final String EVENT_TYPE_SUBSCRIBE = "subscribe";
    /**
     * 事件类型：unsubscribe(取消订阅)
     */
    public static final String EVENT_TYPE_UNSUBSCRIBE = "unsubscribe";
    /**
     * 事件类型：CLICK(自定义菜单点击事件)
     */
    public static final String EVENT_TYPE_CLICK = "CLICK";
    /**
     * 事件类型：VIEW(自定义菜单 URl 视图)
     */
    public static final String EVENT_TYPE_VIEW = "VIEW";
    /**
     * 事件类型：LOCATION(上报地理位置事件)
     */
    public static final String EVENT_TYPE_LOCATION = "LOCATION";
    /**
     * 事件类型：LOCATION(上报地理位置事件)
     */
    public static final String EVENT_TYPE_SCAN = "SCAN";

    public static String textMessageToXml(TextMessage textMessage) {
        xstream.alias("xml", textMessage.getClass());
        return xstream.toXML(textMessage);
    }
    private static XStream xstream = new XStream(new XppDriver() {
        public HierarchicalStreamWriter createWriter(Writer out) {
            return new PrettyPrintWriter(out) {
                boolean cdata = true;
                @SuppressWarnings("rawtypes")
                public void startNode(String name, Class clazz) {
                    super.startNode(name, clazz);
                }
                protected void writeText(QuickWriter writer, String text) {
                    if (cdata) {
                        writer.write("<![CDATA[");
                        writer.write(text);
                        writer.write("]]>");
                    } else {
                        writer.write(text);
                    }
                }
            };
        }
    });

    /**
     * 将微信的请求中参数转成map
     * @param request
     * @return
     */
    public static Map<String,String> xmlToMap(HttpServletRequest request){
        Map<String,String> map = new HashMap<String,String>();
        SAXReader reader = new SAXReader();
        InputStream in = null;
        try {
            in = request.getInputStream();
            Document doc = reader.read(in);
            Element root = doc.getRootElement();
            List<Element> list = root.elements();
            for (Element element : list) {
                map.put(element.getName(), element.getText());
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (DocumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            try {
                in.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return map;
    }
}

4建立后台CheckUtil

public class CheckUtil {
    private static final String token = "wxKeying";
    public static boolean checkSignature(String signature, String timestamp, String nonce) {
        String[] str = new String[]{token, timestamp, nonce};
        //排序
        Arrays.sort(str);
        //拼接字符串
        StringBuffer buffer = new StringBuffer();
        for (int i = 0; i < str.length; i++) {
            buffer.append(str[i]);
        }
        //进行sha1加密
        String temp = SHA1.encode(buffer.toString());
        //与微信提供的signature进行匹对
        return signature.equals(temp);
    }
}

5建立SHA1

public class SHA1 {
    private static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5',
            '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
    private static String getFormattedText(byte[] bytes) {
        int len = bytes.length;
        StringBuilder buf = new StringBuilder(len * 2);
        for (int j = 0; j < len; j++) {
            buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]);
            buf.append(HEX_DIGITS[bytes[j] & 0x0f]);
        }
        return buf.toString();
    }
    public static String encode(String str) {
        if (str == null) {
            return null;
        }
        try {
            MessageDigest messageDigest = MessageDigest.getInstance("SHA1");
            messageDigest.update(str.getBytes());
            return getFormattedText(messageDigest.digest());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}