java后端获取微信jssdk并生成签名

Bertha 。 2024-04-17 17:51 62阅读 0赞

1.主体代码

/**
    	 * 获取jssdk
    	 * @param url
    	 * @return
    	 * @throws Exception
    	 */
    	@RequestMapping(value = "/getWechatJSSDK",method={RequestMethod.POST,RequestMethod.GET})
    	public @ResponseBody Object getWechatJSSDK(String url) throws Exception {
    		Map<String, String> map =  new HashMap<>();
            String access_token = "";
            //拼接地址获取token
            String tokenStr  = HttpRequestUtil.sendGet("https://api.weixin.qq.com/cgi-bin/token","grant_type=client_credential&appid="+miniProAppId+"&secret="+miniProAppSecret);
            JSONObject token = JSON.parseObject(tokenStr);
            access_token = token.getString("access_token");
            //获取jsapi
            String jsapiStr  = HttpRequestUtil.sendGet("https://api.weixin.qq.com/cgi-bin/ticket/getticket","access_token="+access_token+"&type=jsapi");
            JSONObject jsapi = JSON.parseObject(jsapiStr);      
            String jsapi_ticket = jsapi.getString("ticket"); 
            /*****************获取签名signature********************/
            //生成随机字符串  noncestr
            String nonceStr = UUID.randomUUID().toString();
            //时间戳 timestamp，精确到秒 
            String timestamp = Long.toString(System.currentTimeMillis() / 1000);
            //url
            //String Url = url;
            String Stitching = "jsapi_ticket="+jsapi_ticket+"&noncestr="+nonceStr+"&timestamp="+timestamp+"&url="+url;
            System.out.println("Stitching："+Stitching);
            //SHA1 加密
            java.security.MessageDigest digest = java.security.MessageDigest.getInstance("SHA-1");        
            digest.update(Stitching.getBytes());
            byte messageDigest[] = digest.digest();
            StringBuffer hexStr = 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) {
                    hexStr.append(0);
                }
                hexStr.append(shaHex);
            }
            map.put("appid", miniProAppId);
            map.put("timestamp", timestamp);
            map.put("nonceStr", nonceStr);
            map.put("signature", hexStr.toString());
            return AppUtil.returnObject(map,Const.SUCCESSCODE);
    	}

注：（1）.这里的url是由前端传过来的

（2）.常量miniProAppId为appid,miniProAppSecret为secret

2.HttpRequestUtil.sendGet(）方法代码：

/**
    	 * 向指定URL发送GET方法的请求
    	 * 
    	 * @modificationHistory.
    	 * @param url
    	 *            发送请求的URL
    	 * @param param
    	 *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
    	 * @return URL 所代表远程资源的响应结果
    	 */
    	public static String sendGet(String url, String param) {
    		StringBuffer result = new StringBuffer("");
    		BufferedReader in = null;
    		try {
    			String urlNameString = url + "?" + param;
    			URL realUrl = new URL(urlNameString);
    			// 打开和URL之间的连接
    			URLConnection connection = realUrl.openConnection();
    			// 设置通用的请求属性
    			connection.setRequestProperty("accept", "*/*");
    			connection.setRequestProperty("connection", "Keep-Alive");
    			connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
    			// 建立实际的连接
    			connection.connect();
    			// 定义 BufferedReader输入流来读取URL的响应
    			in = new BufferedReader(new InputStreamReader(connection.getInputStream(),"UTF-8"));
    			String line;
    			while ((line = in.readLine()) != null) {
    				result.append(line);
    			}
    		} catch (Exception e) {
    			// System.out.println("发送GET请求出现异常！" + e);
    			e.printStackTrace();
    			return "400";
    		}
    		// 使用finally块来关闭输入流
    		finally {
    			try {
    				if (in != null) {
    					in.close();
    				}
    			} catch (Exception e2) {
    				e2.printStackTrace();
    			}
    		}
    		return result.toString();
    	}