1、获取config参数的工具类，调用getWxConfig方法就行。

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   package com.souvc.weixin.util;
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   import java.io.BufferedReader;
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   import java.io.InputStream;
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   import java.io.InputStreamReader;
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   import java.io.OutputStream;
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   import java.io.UnsupportedEncodingException;
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   import java.net.ConnectException;
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   import java.net.URL;
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    import java.security.MessageDigest;
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    import java.security.NoSuchAlgorithmException;
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    import java.util.Formatter;
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    import java.util.HashMap;
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    import java.util.Map;
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    import java.util.UUID;
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    import javax.net.ssl.HttpsURLConnection;
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    import javax.net.ssl.SSLContext;
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    import javax.net.ssl.SSLSocketFactory;
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    import javax.net.ssl.TrustManager;
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    import javax.servlet.http.HttpServletRequest;
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    import net.sf.json.JSONObject;
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    public class WeixinUtil {
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    /**
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    * 方法名：httpRequest
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    * 详述：发送http请求
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    * 开发人员：souvc
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    * 创建时间：2016-1-5
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    * @param requestUrl
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    * @param requestMethod
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    * @param outputStr
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    * @return 说明返回值含义
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    * @throws 说明发生此异常的条件
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    */
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    public static JSONObject httpRequest(String requestUrl,String requestMethod, String outputStr) {
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    JSONObject jsonObject = null;
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    StringBuffer buffer = new StringBuffer();
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    try {
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    TrustManager[] tm = { new MyX509TrustManager() };
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    SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
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    sslContext.init(null, tm, new java.security.SecureRandom());
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    SSLSocketFactory ssf = sslContext.getSocketFactory();
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    URL url = new URL(requestUrl);
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    HttpsURLConnection httpUrlConn = (HttpsURLConnection) url.openConnection();
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    httpUrlConn.setSSLSocketFactory(ssf);
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    httpUrlConn.setDoOutput(true);
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    httpUrlConn.setDoInput(true);
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    httpUrlConn.setUseCaches(false);
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    httpUrlConn.setRequestMethod(requestMethod);
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    if ("GET".equalsIgnoreCase(requestMethod))
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    httpUrlConn.connect();
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    if (null != outputStr) {
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    OutputStream outputStream = httpUrlConn.getOutputStream();
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    outputStream.write(outputStr.getBytes("UTF-8"));
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    outputStream.close();
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    }
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    InputStream inputStream = httpUrlConn.getInputStream();
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    InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
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    BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
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    String str = null;
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    while ((str = bufferedReader.readLine()) != null) {
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    buffer.append(str);
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    }
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    bufferedReader.close();
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    inputStreamReader.close();
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    inputStream.close();
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    inputStream = null;
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    httpUrlConn.disconnect();
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    jsonObject = JSONObject.fromObject(buffer.toString());
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    } catch (ConnectException ce) {
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    ce.printStackTrace();
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    } catch (Exception e) {
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    e.printStackTrace();
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    }
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    return jsonObject;
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    }
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    /**
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    * 方法名：getWxConfig
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    * 详述：获取微信的配置信息
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    * 开发人员：souvc
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    * 创建时间：2016-1-5
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    * @param request
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    * @return 说明返回值含义
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    * @throws 说明发生此异常的条件
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    */
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    public static Map getWxConfig(HttpServletRequest request) {
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    Map ret = new HashMap();
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    String appId = "xxxx"; // 必填，公众号的唯一标识
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    String secret = "xxxx";
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    String requestUrl = request.getRequestURL().toString();
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    String access_token = "";
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    String jsapi_ticket = "";
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     String timestamp = Long.toString(System.currentTimeMillis() / 1000); // 必填，生成签名的时间戳
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     String nonceStr = UUID.randomUUID().toString(); // 必填，生成签名的随机串
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     String url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="+ appId + "&secret=" + secret;
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     JSONObject json = WeixinUtil.httpRequest(url, "GET", null);
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     if (json != null) {
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     //要注意，access_token需要缓存
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     access_token = json.getString("access_token");
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     url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token="+ access_token + "&type=jsapi";
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     json = WeixinUtil.httpRequest(url, "GET", null);
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     if (json != null) {
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     jsapi_ticket = json.getString("ticket");
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     }
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     }
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     String signature = "";
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     // 注意这里参数名必须全部小写，且必须有序
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     String sign = "jsapi_ticket=" + jsapi_ticket + "&noncestr=" + nonceStr+ "×tamp=" + timestamp + "&url=" + requestUrl;
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     try {
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     MessageDigest crypt = MessageDigest.getInstance("SHA-1");
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     crypt.reset();
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     crypt.update(sign.getBytes("UTF-8"));
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     signature = byteToHex(crypt.digest());
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     } catch (NoSuchAlgorithmException e) {
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     e.printStackTrace();
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     } catch (UnsupportedEncodingException e) {
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     e.printStackTrace();
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     }
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     ret.put("appId", appId);
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     ret.put("timestamp", timestamp);
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     ret.put("nonceStr", nonceStr);
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     ret.put("signature", signature);
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     return ret;
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     }
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     /**
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     * 方法名：byteToHex
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     * 详述：字符串加密辅助方法
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     * 开发人员：souvc
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     * 创建时间：2016-1-5
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     * @param hash
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     * @return 说明返回值含义
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     * @throws 说明发生此异常的条件
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     */
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     private static String byteToHex(final byte[] hash) {
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     Formatter formatter = new Formatter();
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     for (byte b : hash) {
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     formatter.format("%02x", b);
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     }
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     String result = formatter.toString();
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     formatter.close();
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     return result;
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     }
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     }

2、页面的获取方式。

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   <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
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   <%@page language="java" import="com.souvc.weixin.util.WeixinUtil" %>
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   html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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   <html>
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   <head>
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   <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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   <title> title>
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   <%
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   Map ret = new HashMap ();
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    ret=WeixinUtil.getWxConfig(request);
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    request.setAttribute("appId", ret.get("appId"));
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    request.setAttribute("timestamp", ret.get("timestamp"));
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    request.setAttribute("nonceStr", ret.get("nonceStr"));
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    request.setAttribute("signature", ret.get("signature"));
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    %>
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    head>
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    <body>
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    body>
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    <script type="text/javascript" src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js">script>
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    <script type="text/javascript">
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    // 微信信息的以及调用的配置
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    wx.config({
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    debug: false,
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    appId: '${appId}',
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    timestamp: '${timestamp}',
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    nonceStr: '${nonceStr}',
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    signature: '${signature}',
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    jsApiList: ['onMenuShareTimeline', 'onMenuShareAppMessage','onMenuShareQQ','onMenuShareWeibo','onMenuShareQZone']
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    });
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    wx.ready(function(){
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    });
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    script>
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    html>