//主要代碼邏輯
//獲取token 
AccessToken accessToken=wxUtils.getAccessToken();
 String url="https://api.weixin.qq.com/cgi-bin/user/get?access_token="+accessToken.getAccessToken()+"&next_openid=";//獲取所有用戶openid
JSONObject jsonObject = httpRequest(url, "GET", null); 
 try {
 if(jsonObject.getString("errcode")!=null){
 }
 }catch(Exception e) {
 }
 WeixinUserList userList = (WeixinUserList)JSONObject.toBean(jsonObject, WeixinUserList.class);
 if(null==userList) {
  return "無用戶";
 }
 userList.getTotal();//關注總人數
 //用戶openId 列表
 WxOpenidInfo wxOpenidInfo=userList.getData();
 List<String> openIdList=null;
 if(null!=wxOpenidInfo) {
 openIdList=wxOpenidInfo.getOpenid();//公眾號返回的openid列表數據 
 if(null!=openIdList && openIdList.size()>0) {
 for(String opendid:openIdList) {
      //獲取用戶的基本信息（unionid機制）
  url="https://api.weixin.qq.com/cgi-bin/user/info?    access_token="+accessToken.getAccessToken()+"&openid="+opendid+"&lang=zh_CN";//通過openid獲取用戶信息
  jsonObject = httpRequest(url, "GET", null); 
  WeixinUser wxUser=(WeixinUser)JSONObject.toBean(jsonObject, WeixinUser.class);
      //進行數據庫表A的儲存操作 
  int row = gzhService.addGZHUser(wxUser);
  }
 }
}
  
  
/**
 * 用戶列表 
 * @author 一葉知秋plus
 *
 */
public class WeixinUserList{
 
 
  
   private Integer total;//關注該公眾賬號的總用戶數
 
   private Integer count;//拉取的OPENID個數，最大值為10000
 
   private WxOpenidInfo data;//列表數據，OPENID的列表
 
   private String next_openid;//拉取列表的最后一個用戶的OPENID
 
   private int errcode;//錯誤編碼
 
   private String errmsg="ok";//錯誤提示
 
   public Integer getTotal() {
     return total;
   }
 
   public void setTotal(Integer total) {
     this.total = total;
   }
 
   public Integer getCount() {
     return count;
   }
 
   public void setCount(Integer count) {
     this.count = count;
   }
 
   public String getNext_openid() {
     return next_openid;
   }
 
   public void setNext_openid(String next_openid) {
     this.next_openid = next_openid;
   }
 
   public WxOpenidInfo getData() {
     return data;
   }
 
   public void setData(WxOpenidInfo data) {
     this.data = data;
   }
 
   public int getErrcode() {
     return errcode;
   }
 
   public void setErrcode(int errcode) {
     this.errcode = errcode;
   }
 
   public String getErrmsg() {
     return errmsg;
   }
 
   public void setErrmsg(String errmsg) {
     this.errmsg = errmsg;
   }
 
 }
 
 
/**
 * 用戶基本信息 
 * @author 一葉知秋plus
 *
 */
 
 public class WeixinUser {
 private String subscribe;// 用戶是否訂閱該公眾號標識，值為0時，代表此用戶沒有關注該公眾號，拉取不到其余信息。
 private String openid;// 用戶的標識，對當前公眾號唯一
 private String nickname;// 用戶的昵稱
 private String sex;// 用戶的性別，值為1時是男性，值為2時是女性，值為0時是未知
 private String city;// 用戶所在城市
 private String country;// 用戶所在國家
 private String province;// 用戶所在省份
 private String language;// 用戶的語言，簡體中文為zh_CN
 private List<String> tagid_list;//用戶被打上的標簽ID列表
 private String unionid; //用戶的unionid
 private String headimgurl;//用戶的頭像
 
 
 
 
 public String getHeadimgurl() {
 return headimgurl;
 }
 public void setHeadimgurl(String headimgurl) {
 this.headimgurl = headimgurl;
 }
 public String getUnionid() {
 return unionid;
 }
 public void setUnionid(String unionid) {
 this.unionid = unionid;
 }
 public String getSubscribe() {
 return subscribe;
 }
 public void setSubscribe(String subscribe) {
 this.subscribe = subscribe;
 }
 public String getOpenid() {
 return openid;
 }
 public void setOpenid(String openid) {
 this.openid = openid;
 }
 public String getNickname() {
 return nickname;
 }
 public void setNickname(String nickname) {
 this.nickname = nickname;
 }
 public String getSex() {
 return sex;
 }
 public void setSex(String sex) {
 this.sex = sex;
 }
 public String getCity() {
 return city;
 }
 public void setCity(String city) {
 this.city = city;
 }
 public String getCountry() {
 return country;
 }
 public void setCountry(String country) {
 this.country = country;
 }
 public String getProvince() {
 return province;
 }
 public void setProvince(String province) {
 this.province = province;
 }
 public String getLanguage() {
 return language;
 }
 public void setLanguage(String language) {
 this.language = language;
 }
 public List<String> getTagid_list() {
 return tagid_list;
 }
 public void setTagid_list(List<String> tagid_list) {
 this.tagid_list = tagid_list;
 }
}
 
 
public class WxOpenidInfo {
 private List<String> openid;
 
  public List<String> getOpenid() {
    return openid;
  }
 
  public void setOpenid(List<String> openid) {
    this.openid = openid;
  }
}

/**
 * 請求校驗工具類
 */
public class SignUtil {
  // 與接口配置信息中的Token要一致，我的是明文格式
  private static String token = "填寫你服務器配置時寫的token";
 
  
  public static boolean checkSignature(String signature, String timestamp,
      String nonce) {
    //從請求中（也就是微信服務器傳過來的）拿到的token, timestamp, nonce
    String[] arr = new String[] { token, timestamp, nonce };
    // 將token、timestamp、nonce三個參數進行字典序排序
    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");
      // 將三個參數字符串拼接成一個字符串進行sha1加密
      byte[] digest = md.digest(content.toString().getBytes());
      //將字節數組轉成字符串
      tmpStr = byteToStr(digest);
    } catch (NoSuchAlgorithmException e) {
      e.printStackTrace();
    }
 
    content = null;
    // 將sha1加密后的字符串可與signature對比，標識該請求來源于微信
    return tmpStr != null ? tmpStr.equals(signature.toUpperCase()) : false;
  }
 
 //將加密后的字節數組變成字符串
  private static String byteToStr(byte[] byteArray) {
    String strDigest = "";
    for (int i = 0; i < byteArray.length; i++) {
      strDigest += byteToHexStr(byteArray[i]);
    }
    return strDigest;
  }
 
  private static String byteToHexStr(byte mByte) {
    char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A',
        'B', 'C', 'D', 'E', 'F' };
    char[] tempArr = new char[2];
    tempArr[0] = Digit[(mByte >>> 4) & 0X0F];
    tempArr[1] = Digit[mByte & 0X0F];
 
    String s = new String(tempArr);
    return s;
  }
//用于字典排序
  public static void sort(String a[]) {
    for (int i = 0; i < a.length - 1; i++) {
      for (int j = i + 1; j < a.length; j++) {
        if (a[j].compareTo(a[i]) < 0) {
          String temp = a[i];
          a[i] = a[j];
          a[j] = temp;
        }
      }
    }
  }
}
 
 
//事件響應的接口
@RequestMapping(value="/GZHConcern.do")
 public void GZHConcern(HttpServletRequest request, HttpServletResponse response) throws IOException {
 String message = "success";
 // 微信加密簽名 
 String signature = request.getParameter("signature"); 
 // 時間戳 
 String timestamp = request.getParameter("timestamp"); 
 // 隨機數 
 String nonce = request.getParameter("nonce"); 
 // 隨機字符串 
 String echostr = request.getParameter("echostr"); 
 PrintWriter out = response.getWriter(); 
 // 通過檢驗signature對請求進行校驗，若校驗成功則原樣返回echostr，表示接入成功，否則接入失敗 
 if (SignUtil.checkSignature(signature, timestamp, nonce)) { 
  out.print(echostr);
  //在這里相應微信的操作
 } 
 
 try {
  Map<String, String> map = XmlUtil.xmlToMap(request);
  String fromUserName = map.get("FromUserName");//消息來源用戶標識
  String toUserName = map.get("ToUserName");//消息目的用戶標識
  String msgType = map.get("MsgType");//消息類型
  String content = map.get("Content");//消息內容
  
  String eventType = map.get("Event");
  WeixinUser weixinUser = new WeixinUser();
  if(MessageUtil.MSGTYPE_EVENT.equals(msgType)){//如果為事件類型
  if(MessageUtil.MESSAGE_SUBSCIBE.equals(eventType)){//處理訂閱事件
   //獲取token
   String token = WXUtil.getGZHToken();
   weixinUser = WXUtil.getUnionid(fromUserName, token);
   //進行數據庫的操作
   weixinUser.setNickname(weixinUser.getNickname());
   int row = gzhService.addGZHUser(weixinUser);
   //通過openid獲取用戶的數據
   message = MessageUtil.subscribeForText(toUserName, fromUserName);
  }else if(MessageUtil.MESSAGE_UNSUBSCIBE.equals(eventType)){//處理取消訂閱事件
   message = MessageUtil.unsubscribe(toUserName, fromUserName);
   weixinUser.setOpenid(fromUserName);
   //進行數據庫的操作
   int row = gzhService.deleteGZHUser(weixinUser);
  }
  }
 } catch (DocumentException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }finally {
  out.close();
 }
 out = null;
 }
 
/*
 * 消息處理工具類
 */
public class MessageUtil {
 public static final String MSGTYPE_EVENT = "event";//消息類型--事件
 public static final String MESSAGE_SUBSCIBE = "subscribe";//消息事件類型--訂閱事件
 public static final String MESSAGE_UNSUBSCIBE = "unsubscribe";//消息事件類型--取消訂閱事件
 public static final String MESSAGE_TEXT = "text";//消息類型--文本消息
 
 /*
 * 組裝文本消息
 */
 public static String textMsg(String toUserName,String fromUserName,String content){
 TextMessage text = new TextMessage();
 text.setFromUserName(toUserName);
 text.setToUserName(fromUserName);
 text.setMsgType(MESSAGE_TEXT);
 text.setCreateTime(new Date().getTime());
 text.setContent(content);
 return XmlUtil.textMsgToxml(text);
 }
 
 /*
 * 響應訂閱事件--回復文本消息
 */
 public static String subscribeForText(String toUserName,String fromUserName){
 return textMsg(toUserName, fromUserName, "歡迎關注，精彩內容不容錯過！！！");
 }
 
 /*
 * 響應取消訂閱事件
 */
 public static String unsubscribe(String toUserName,String fromUserName){
 //TODO 可以進行取關后的其他后續業務處理
 System.out.println("用戶："+ fromUserName +"取消關注~");
 return "";
 }
}
 
 
/*
 * xml處理工具類
 */
public class XmlUtil {
 /*
 * xml轉map
 */
 public static Map<String, String> xmlToMap(HttpServletRequest request) throws IOException, DocumentException{
 HashMap<String, String> map = new HashMap<String,String>();
 SAXReader reader = new SAXReader();
 
 InputStream ins = request.getInputStream();
 Document doc = reader.read(ins);
 
 Element root = doc.getRootElement();
 @SuppressWarnings("unchecked")
 List<Element> list = (List<Element>)root.elements();
 
 for(Element e:list){
  map.put(e.getName(), e.getText());
 }
 ins.close();
 return map;
 }
 /*
 * 文本消息對象轉xml
 */
 public static String textMsgToxml(TextMessage textMessage){
 XStream xstream = new XStream();
 xstream.alias("xml", textMessage.getClass());
 return xstream.toXML(textMessage);
 }
}