public class WXUtil {

private static String appid = ""; 

private static String secret = ""; 

private static String token_url = "https://api.weixin.qq.com/cgi-bin/token";

private static String ticket_url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket";

public static String wx_jsapiticket = "";

// public static String wx_accesstoken = "";

// public static String wx_jsapiticket = "sM4AOVdWfPE4DxkXGEs8VKn28rHes_cWG6CZiaKmN5FAV6H24W2R5m9KG6ndDlxULINyBD3HL1_vv-TrO5LJfQ";

private static Log log = LogFactory.getLog(WXUtil.class);

public static void getWxDate(HttpServletRequest request){

try{

String jsapi_ticket = wx_jsapiticket;

String noncestr = WXUtil.getRandomString(16);

String timestamp = String.valueOf(System.currentTimeMillis()/1000);

String urlData = "jsapi_ticket="+jsapi_ticket+"&noncestr="+noncestr+"&timestamp="+timestamp+"&url="+CommonUtil.getBasePath(request);

String signature = WXUtil.getSha1(urlData);

request.setAttribute("wx_noncestr", noncestr);

request.setAttribute("wx_timestamp", timestamp);

request.setAttribute("wx_signature", signature);

}catch(Exception e){

log.error("微信页面初始化失败======>"+e.getMessage());

e.printStackTrace();

}

}

public static String getAppsecrect() throws Exception{

String appsecrect = "";

String urlDate = "grant_type=client_credential&appid="+appid+"&secret="+secret;

String json = CommonUtil.postURL(urlDate, token_url);

appsecrect = CommonUtil.viewJsonKey(json,"access_token");

log.info(new Timestamp(System.currentTimeMillis())+"getAppsecrect 微信获取access_token=====>"+json);

if(appsecrect == null || "".equals(appsecrect)){

throw new Exception("getAppsecrect access_token失败=====>"+json);

}

// wx_accesstoken=appsecrect;//server端微信模板使用

return appsecrect;

}

public static String getJsApiTicket() throws Exception{

log.info("请求微信ticket=====>");

String token = WXUtil.getAppsecrect();

String urlDate = "access_token="+token+"&type=jsapi";

String json = CommonUtil.postURL(urlDate, ticket_url); //活动产品

wx_jsapiticket = CommonUtil.viewJsonKey(json,"ticket");

log.info(new Timestamp(System.currentTimeMillis())+" getJsApiTicket 微信获取ticket=====>"+json);

if(wx_jsapiticket == null || "".equals(wx_jsapiticket)){

throw new Exception("getJsApiTicket ticket失败=====>"+json);

}

return wx_jsapiticket;

}

/**

* sha1签名

* @param url

* @return

*/

public static String getSha1(String url){

try {

MessageDigest digest = java.security.MessageDigest.getInstance("SHA-1");

digest.update(url.getBytes());

byte messageDigest[] = digest.digest();

// Create Hex String

StringBuffer hexString = new StringBuffer();

// 字节数组转换为 十六进制 数

for (int i = 0; i < messageDigest.length; i++) {

String shaHex = Integer.toHexString(messageDigest[i] & 0xFF);

if (shaHex.length() < 2) {

hexString.append(0);

}

hexString.append(shaHex);

}

return hexString.toString();

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

}

return "";

}

public static String getRandomString(int length) { //length表示生成字符串的长度

String base = "abcdefghijklmnopqrstuvwxyz0123456789";

Random random = new Random();

StringBuffer sb = new StringBuffer();

for (int i = 0; i < length; i++) {

int number = random.nextInt(base.length());

sb.append(base.charAt(number));

}

return sb.toString();

}

public static void main(String args[]){

try{

String jsapiticket = WXUtil.getJsApiTicket();

System.out.println("jsapiticket======>"+jsapiticket);

}catch(Exception e){

}

}

/**

* 静默授权通过返回的code获取用户微信id

* @param request

* @param response

* @param code

* @return

* @throws UnsupportedEncodingException

*/

public static String getWXinfo(HttpServletRequest request,HttpServletResponse response,String code) throws UnsupportedEncodingException{

String get_access_token_url="https://api.weixin.qq.com/sns/oauth2/access_token?" +

"appid=APPID" +

"&secret=SECRET&" +

"code=CODE&grant_type=authorization_code";

// 将请求、响应的编码均设置为UTF-8（防止中文乱码）

request.setCharacterEncoding("UTF-8");

response.setCharacterEncoding("UTF-8");

get_access_token_url=get_access_token_url.replace("APPID",appid);

get_access_token_url=get_access_token_url.replace("SECRET", secret);

get_access_token_url=get_access_token_url.replace("CODE", code);

String json=HttpUtil.getUrl(get_access_token_url);

JSONObject jsonObject=JSONObject.fromObject(json);

String openid=jsonObject.getString("openid");

try{

WXUtil.getWxDate(request);

}catch(Exception e){

e.printStackTrace();

}

return openid;

}

}