参数名
http://www.php.cn/wiki/835.html" target="_blank">width="346" valign="top" style="word-break:break-all"> | 描述 |
appId | 应用ID 登录微信公众号管理平台可查询 |
timestamp | 必填,生成签名的时间戳 |
nonceStr | 必填,生成签名的随机串 |
signature | 必填,签名,见附录1 |
上述表格中的参数,我们在前一章节已经说的很明白,之所以做出一个表格是因为如果想要成功接入微信jsapi这四个参数是凭证,也就是相当于一个门必须要有四把钥匙才能打开,缺一不可 。
接下来的案例采用java的servlet做的跳转页面,没有用到springMVC,大家可把请求的路径更换成controller路径即可。
WxJsAPIServlet代码:
package com.test; import java.io.IOException; import java.io.PrintWriter; import java.util.Map; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.test.util.JsapiTicketUtil; import com.test.util.Sign; public class WxJsAPIServlet extends HttpServlet { /** * Constructor of the object. */ public WxJsAPIServlet() { super(); } /** * Destruction of the servlet. */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet. * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("wxJSAPI===================="); String jsapi_ticket =JsapiTicketUtil.getJSApiTicket();; Map String timestamp = map.get("timestamp"); String nonceStr = map.get("nonceStr"); String signature = map.get("signature"); String appId = "应用Id"; request.setAttribute("appId", appId); request.setAttribute("timestamp", timestamp); request.setAttribute("signature",signature); request.setAttribute("nonceStr", nonceStr); request.getRequestDispatcher("jsapi/jsapi.jsp").forward(request, response); } /** * The doPost method of the servlet. * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); } /** * Initialization of the servlet. * * @throws ServletException if an error occurs */ public void init() throws ServletException { // Put your code here } } |
第44行是生成 jsapi_ticket的工具类,在下面有贴出工具类的代码。
第45行 Sign类的sign方法,把表格中的最后三个参数封装放到Map集合中了。其中参数就是请求的servlet地址并跳转到调用微信jsapi的jsp界面。
第49行 appId替换成你自己的应用id,如果不知道应用id 可登陆微信公众平台管理中心查询。
servlet对应的web.xml代码
<display-name>This is the display name of my J2EE component
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生成签名算法类Sign代码:
package com.test.util; /*** * V型知识库 www.vxzsk.com */ import java.util.UUID; import java.util.Map; import java.util.HashMap; import java.util.Formatter; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.io.UnsupportedEncodingException; public class Sign { public static Map Map 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=" + jsapi_ticket + "&noncestr=" + nonce_str + "×tamp=" + timestamp + "&url=" + url; System.out.println(string1); 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("jsapi_ticket", jsapi_ticket); ret.put("nonceStr", nonce_str); ret.put("timestamp", timestamp); ret.put("signature", signature); return ret; } 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; } private static String create_nonce_str() { return UUID.randomUUID().toString(); } private static String create_timestamp() { return Long.toString(System.currentTimeMillis() / 1000); } public static void main(String[] args) { String jsapi_ticket =JsapiTicketUtil.getJSApiTicket(); // 注意 URL 一定要动态获取,不能 hardcode String url = "http://www.vxzsk.com/xx/x.do";//url是你请求的一个action或者controller地址,并且方法直接跳转到使用jsapi的jsp界面 Map for (Map.Entry entry : ret.entrySet()) { System.out.println(entry.getKey() + ", " + entry.getValue()); } }; } |
生成jsapi_ticket参数的工具类JsapiTicketUtil代码
package com.test.util; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; import net.sf.json.JSONObject; import com.test.weixin.TestAcessToken; public class JsapiTicketUtil { /*** * 模拟get请求 * @param url * @param charset * @param timeout * @return */ public static String sendGet(String url, String charset, int timeout) { String result = ""; try { URL u = new URL(url); try { URLConnection conn = u.openConnection(); conn.connect(); conn.setConnectTimeout(timeout); BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(), charset)); String line=""; while ((line = in.readLine()) != null) { result = result + line; } in.close(); } catch (IOException e) { return result; } } catch (MalformedURLException e) { return result; } return result; } public static String getAccessToken(){ String appid="你公众号基本设置里的应用id";//应用ID String appSecret="你公众号基本设置里的应用密钥";//(应用密钥) String url ="https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="+appid+"&secret="+appSecret+""; String backData=TestAcessToken.sendGet(url, "utf-8", 10000); String accessToken = (String) JSONObject.fromObject(backData).get("access_token"); return accessToken; } public static String getJSApiTicket(){ //获取token String acess_token= JsapiTicketUtil.getAccessToken(); String urlStr = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token="+acess_token+"&type=jsapi"; String backData=TestAcessToken.sendGet(urlStr, "utf-8", 10000); String ticket = (String) JSONObject.fromObject(backData).get("ticket"); return ticket; } public static void main(String[] args) { String jsapiTicket = JsapiTicketUtil.getJSApiTicket(); System.out.println("调用微信jsapi的凭证票为:"+jsapiTicket); } } |
上述代码中有个获取access_token的方法,请读者更换自己的参数即可
jsapi.jsp代码
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> W3C//DTD HTML 4.01 Transitional//EN"> <head>
viewport" content="width=320.1,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no">
欢迎来到微信jsapi测试界面-V型知识库
timestamp:${ timestamp}
nonceStr:${ nonceStr}
signature:${ signature}
appId:${ appId} onclick="uploadImg();"/> 获取当前位置" onclick="getLocation();"/>
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