微信开发之判断当前客户端是否支持指定的js接口的方法

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>


  
    
    
    
    

  
  
欢迎来到微信jsapi测试界面-V型知识库
  

     
timestamp：${ timestamp}
  
     
nonceStr：${ nonceStr}
  
     
signature：${ signature}
  
     
appId:${ appId}
  
     
     
基础接口之判断当前客户端是否支持指定的js接口
   
     
  

  
  

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

System.out.println("wxJSAPI====================");

String jsapi_ticket =JsapiTicketUtil.getJSApiTicket();;

Map map = Sign.sign(jsapi_ticket, "http://www.vxzsk.com/weChat/wxJsAPIServlet");

String timestamp = map.get("timestamp");

String nOnceStr= map.get("nonceStr");

String signature = map.get("signature");

String appId = "你自己的应用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);

}

package com.test.util;
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 sign(String jsapi_ticket, String url) {
        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=" + 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 ret = sign(jsapi_ticket, url);
        for (Map.Entry entry : ret.entrySet()) {
            System.out.println(entry.getKey() + ", " + entry.getValue());
        }
    };
}

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);
    }
}