1.第一步：
设置调用微信js安全域名，就可以在该域名下调用微信的js接口
2.第二步：
将下面的js附在需要调用微信扫一扫的页面上，前提是需要引入微信的js[]
3.第三步：
参考官方文档 https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421141115&token=876521668&lang=zh_CN
通过后台获取js权限签名jsapi_ticket【参考文档：http://mp.weixin.qq.com/wiki/7/aaa137b55fb2e0456bf8dd9148dd613f.html#.E9.99.84.E5.BD.951-JS-SDK.E4.BD.BF.E7.94.A8.E6.9D.83.E9.99.90.E7.AD.BE.E5.90.8D.E7.AE.97.E6.B3.95】
后台获取签名代码：
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 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 ret = new HashMap(); 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); } }
官方文档示例：
参考以下文档获取access_token（有效期7200秒，开发者必须在自己的服务全局缓存access_token）：../15/54ce45d8d30b6bf6758f68d2e95bc627.html
用第一步拿到的access_token 采用http GET方式请求获得jsapi_ticket（有效期7200秒，开发者必须在自己的服务全局缓存jsapi_ticket）：https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=ACCESS_TOKEN&type=jsapi
4 第四步：
前台进入页面：`
@RequestMapping(value = "/tiaoma") public String tiaoma( HttpServletRequest request,GoodsVO goods) throws Exception { String Url=request.getRequestURL()+"?"+request.getQueryString().toString();; Map resMap = new HashMap(); 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"; }`
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