JS 调用微信扫一扫功能

package com.epoch.wap.common;import java.io.IOException;import java.io.UnsupportedEncodingException;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.util.Formatter;import java.util.HashMap;import java.util.Map;import java.util.UUID;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.HttpClients;import org.apache.http.util.EntityUtils;import com.epoch.common.utils.JsonUtil;/**  * 官方给的使用js的验证工具  * @author Administrator  *  */ public class JsSignUtil {   public static String accessToken = null;   public static Map<String, Object> sign(String url) {      String sendUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=**appid**&secret= **secret**";    String result = getHttpResult(sendUrl);    Object accessResult = JsonUtil.getValueFromJson(result, "access_token");    String signUrl = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token="+accessResult.toString()+"&type=jsapi";    String resultSign = getHttpResult(signUrl);    Object ticket = JsonUtil.getValueFromJson(resultSign, "ticket");    Map<String, Object> ret = new HashMap<String, Object>();     String nonce_str = create_nonce_str();     String timestamp = create_timestamp();     String string1;     String signature = "";     //注意这里参数名必须全部小写，且必须有序     string1 = "jsapi_ticket=" + ticket +         "&noncestr=" + nonce_str +          "×tamp=" + timestamp +          "&url=" + url;     try     {       MessageDigest crypt = MessageDigest.getInstance("SHA-1");       crypt.reset();       crypt.update(string1.getBytes("UTF-8"));       signature = byteToHex(crypt.digest());     }     catch (NoSuchAlgorithmException e)     {       e.printStackTrace();     }     catch (UnsupportedEncodingException e)     {       e.printStackTrace();     }     ret.put("url", url);     ret.put("nonceStr", nonce_str);     ret.put("timestamp", timestamp);     ret.put("signature", signature);     ret.put("jsapi_ticket", ticket);     ret.put("appId", "wx154f74654ae04891");    return ret;   }   /**    * 随机加密    * @param hash    * @return    */   private static String byteToHex(final byte[] hash) {     Formatter formatter = new Formatter();     for (byte b : hash)     {       formatter.format("%02x", b);     }     String result = formatter.toString();     formatter.close();     return result;   }   /*   * 获取访问地址链接返回值   */  private static String getHttpResult(String url) {    String result = "";    HttpGet httpRequest = new HttpGet(url);    try {      HttpResponse httpResponse = HttpClients.createDefault().execute(httpRequest);      if (httpResponse.getStatusLine().getStatusCode() == 200) {        result = EntityUtils.toString(httpResponse.getEntity());      }    } catch (ClientProtocolException e) {      e.printStackTrace();      result = e.getMessage().toString();    } catch (IOException e) {      e.printStackTrace();      result = e.getMessage().toString();    }    return result;  }  /**    * 产生随机串--由程序自己随机产生    * @return    */   private static String create_nonce_str() {     return UUID.randomUUID().toString();   }   /**    * 由程序自己获取当前时间    * @return    */   private static String create_timestamp() {     return Long.toString(System.currentTimeMillis() / 1000);   } } 

@RequestMapping(value = "/tiaoma")public String tiaoma( HttpServletRequest request,GoodsVO goods) throws Exception {  String Url=request.getRequestURL()+"?"+request.getQueryString().toString();;  Map<String, Object> resMap = new HashMap<String, Object>();  resMap = JsSignUtil.sign(Url);  request.setAttribute("nonceStr", resMap.get("nonceStr"));  request.setAttribute("timestamp", resMap.get("timestamp"));  request.setAttribute("signature", resMap.get("signature"));  request.setAttribute("appId", resMap.get("appId"));  request.setAttribute("url", resMap.get("url"));  request.setAttribute("jsapi_ticket",                 resMap.get("jsapi_ticket"));  return "index/tiaoma";}`