微信JS-SDK获取signature签名以及config配置

wx.config({  
    debug: true, // 开启调试模式,调用的所有api的返回值会在客户端alert出来，若要查看传入的参数，可以在pc端打开，参数信息会通过log打出，仅在pc端时才会打印。  
    appId: ‘‘, // 必填，公众号的唯一标识  
    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  
    jsApiList: [] // 必填，需要使用的JS接口列表，所有JS接口列表见附录2  
});  

{  
"errcode":0,  
"errmsg":"ok",  
"ticket":"bxLdikRXVbTPdHSM05e5u5sUoXNKd8-41ZO3MhKoyN5OfkWITDGgnr2fwJ0m9E8NYzWKVZvdVtaUgWvsdshFKA",  
"expires_in":7200  
}  

public static String getAccessToken() {  
    String access_token = "";  
    String grant_type = "client_credential";//获取access_token填写client_credential   
    String AppId="APPID";//第三方用户唯一凭证  
    String secret="APPSECRET";//第三方用户唯一凭证密钥，即appsecret   
    //这个url链接地址和参数皆不能变  
    String url = "https://api.weixin.qq.com/cgi-bin/token?grant_type="+grant_type+"&appid="+AppId+"&secret="+secret;  
       
    try {  
        URL urlGet = new URL(url);  
        HttpURLConnection http = (HttpURLConnection) urlGet.openConnection();  
        http.setRequestMethod("GET"); // 必须是get方式请求  
        http.setRequestProperty("Content-Type","application/x-www-form-urlencoded");  
        http.setDoOutput(true);  
        http.setDoInput(true);  
        System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30秒  
        System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30秒  
        http.connect();  
        InputStream is = http.getInputStream();  
        int size = is.available();  
        byte[] jsonBytes = new byte[size];  
        is.read(jsonBytes);  
        String message = new String(jsonBytes, "UTF-8");  
        JSONObject demoJson = JSONObject.fromObject(message);  
        System.out.println("JSON字符串："+demoJson);  
        access_token = demoJson.getString("access_token");  
        is.close();  
    } catch (Exception e) {  
            e.printStackTrace();  
    }  
    return access_token;  
}

public static String getTicket(String access_token) {  
    String ticket = null;  
    String url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token="+ access_token +"&type=jsapi";//这个url链接和参数不能变  
    try {  
        URL urlGet = new URL(url);  
        HttpURLConnection http = (HttpURLConnection) urlGet.openConnection();  
        http.setRequestMethod("GET"); // 必须是get方式请求  
        http.setRequestProperty("Content-Type","application/x-www-form-urlencoded");  
        http.setDoOutput(true);  
        http.setDoInput(true);  
        System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30秒  
        System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30秒  
        http.connect();  
        InputStream is = http.getInputStream();  
        int size = is.available();  
        byte[] jsonBytes = new byte[size];  
        is.read(jsonBytes);  
        String message = new String(jsonBytes, "UTF-8");  
        JSONObject demoJson = JSONObject.fromObject(message);  
        System.out.println("JSON字符串："+demoJson);  
        ticket = demoJson.getString("ticket");  
        is.close();  
    } catch (Exception e) {  
            e.printStackTrace();  
    }  
    return ticket;  
}  

public static String SHA1(String decript) {  
    try {  
        MessageDigest digest = java.security.MessageDigest.getInstance("SHA-1");  
        digest.update(decript.getBytes());  
        byte messageDigest[] = digest.digest();  
        // Create Hex String  
        StringBuffer hexString = new StringBuffer();  
        // 字节数组转换为 十六进制 数  
            for (int i = 0; i < messageDigest.length; i++) {  
                String shaHex = Integer.toHexString(messageDigest[i] & 0xFF);  
                if (shaHex.length() < 2) {  
                    hexString.append(0);  
                }  
                hexString.append(shaHex);  
            }  
            return hexString.toString();  
   
        } catch (NoSuchAlgorithmException e) {  
            e.printStackTrace();  
        }  
        return "";  
}  

public static void main(String[] args) {  
    //1、获取AccessToken  
    String accessToken = getAccessToken();  
      
    //2、获取Ticket  
    String jsapi_ticket = getTicket(accessToken);  
      
    //3、时间戳和随机字符串  
    String noncestr = UUID.randomUUID().toString().replace("-", "").substring(0, 16);//随机字符串  
    String timestamp = String.valueOf(System.currentTimeMillis() / 1000);//时间戳  
      
    System.out.println("accessToken:"+accessToken+"\njsapi_ticket:"+jsapi_ticket+"\n时间戳："+timestamp+"\n随机字符串："+noncestr);  
      
    //4、获取url  
    String url="http://www.luiyang.com/add.html";  
    /*根据JSSDK上面的规则进行计算，这里比较简单，我就手动写啦 
    String[] ArrTmp = {"jsapi_ticket","timestamp","nonce","url"}; 
    Arrays.sort(ArrTmp); 
    StringBuffer sf = new StringBuffer(); 
    for(int i=0;i<ArrTmp.length;i++){ 
        sf.append(ArrTmp[i]); 
    } 
    */  
      
    //5、将参数排序并拼接字符串  
    String str = "jsapi_ticket="+jsapi_ticket+"&noncestr="+noncestr+"&timestamp="+timestamp+"&url="+url;  
     
    //6、将字符串进行sha1加密  
    String signature =SHA1(str);  
    System.out.println("参数："+str+"\n签名："+signature);  
}  

wx.config({  
    debug: true, //调试阶段建议开启  
    appId: "APPID",//APPID  
    timestamp: "timestamp",//上面main方法中拿到的时间戳timestamp  
    nonceStr: "nonceStr",//上面main方法中拿到的随机数nonceStr  
    signature: "signature",//上面main方法中拿到的签名signature  
    jsApiList: [  
           //所有要调用的 API 都要加到这个列表中  
          "chooseImage"//从本地的相册、图库选择图片  
    ]  
});