苍穹外卖-DAY09

• 百度地图

  https://lbsyun.baidu.com/apiconsole/key

  用来检测地址是否超过配送距离

  检验方式

      /**
       * 检查客户的收货地址是否超出配送范围
       */
      private void checkOutOfRange(String address) throws UnsupportedEncodingException {
          // --- 第一步：获取店铺经纬度 ---
          Map<String, String> shopMap = new LinkedHashMap<>();
          shopMap.put("address", shopAddress);
          shopMap.put("output", "json");
          shopMap.put("ak", ak);
  
          // 【新增】必须添加 timestamp 参数，值为当前时间戳（毫秒）
          shopMap.put("timestamp", String.valueOf(System.currentTimeMillis()));
  
          // 计算SN并加入参数
          String shopSn = generateSn("/geocoding/v3", shopMap);
          shopMap.put("sn", shopSn);
  
          String shopCoordinate = HttpClientUtil.doGet("https://api.map.baidu.com/geocoding/v3", shopMap);
          JSONObject shopJson = JSON.parseObject(shopCoordinate);
          if (!"0".equals(shopJson.getString("status"))) {
              throw new OrderBusinessException("店铺地址解析失败: " + shopJson.getString("message"));
          }
          JSONObject shopLocation = shopJson.getJSONObject("result").getJSONObject("location");
          String shopLngLat = shopLocation.getString("lat") + "," + shopLocation.getString("lng");
  
  
          // --- 第二步：获取用户收货地址经纬度 ---
          Map<String, String> userMap = new LinkedHashMap<>();
          userMap.put("address", address);
          userMap.put("output", "json");
          userMap.put("ak", ak);
  
          // 【新增】必须添加 timestamp 参数
          userMap.put("timestamp", String.valueOf(System.currentTimeMillis()));
  
          // 计算SN并加入参数
          String userSn = generateSn("/geocoding/v3", userMap);
          userMap.put("sn", userSn);
  
          String userCoordinate = HttpClientUtil.doGet("https://api.map.baidu.com/geocoding/v3", userMap);
          JSONObject userJson = JSON.parseObject(userCoordinate);
          if (!"0".equals(userJson.getString("status"))) {
              throw new OrderBusinessException("收货地址解析失败: " + userJson.getString("message"));
          }
          JSONObject userLocation = userJson.getJSONObject("result").getJSONObject("location");
          String userLngLat = userLocation.getString("lat") + "," + userLocation.getString("lng");
  
  
          // --- 第三步：路线规划 (驾车) ---
          Map<String, String> driveMap = new LinkedHashMap<>();
          driveMap.put("origin", shopLngLat);
          driveMap.put("destination", userLngLat);
          driveMap.put("steps_info", "0");
          driveMap.put("ak", ak);
  
          // 【新增】必须添加 timestamp 参数
          driveMap.put("timestamp", String.valueOf(System.currentTimeMillis()));
  
          // 计算SN并加入参数 (注意URI变成了 directionlite/v1/driving)
          String driveSn = generateSn("/directionlite/v1/driving", driveMap);
          driveMap.put("sn", driveSn);
  
          String driveJsonStr = HttpClientUtil.doGet("https://api.map.baidu.com/directionlite/v1/driving", driveMap);
          JSONObject driveJson = JSON.parseObject(driveJsonStr);
          if (!"0".equals(driveJson.getString("status"))) {
              throw new OrderBusinessException("配送路线规划失败: " + driveJson.getString("message"));
          }
  
          JSONObject result = driveJson.getJSONObject("result");
          JSONArray jsonArray = result.getJSONArray("routes");
          Integer distance = jsonArray.getJSONObject(0).getInteger("distance");
  
          if (distance > 5000) {
              throw new OrderBusinessException("超出配送范围");
          }
      }
  
      /**
       * 核心算法：生成SN签名
       * 基于百度地图官方Java Demo改编
       *
       * @param uri 接口的URI，例如 /geocoding/v3
       * @param data 已经put好参数的LinkedHashMap
       * @return 计算后的sn字符串
       */
      private String generateSn(String uri, Map<String, String> data) throws UnsupportedEncodingException {
          try {
              // 1. 将Map参数转换为UrlEncoded的查询字符串
              StringBuilder queryString = new StringBuilder();
              for (Map.Entry<String, String> pair : data.entrySet()) {
                  queryString.append(pair.getKey()).append("=");
                  //以此处为例，Value必须进行UTF-8编码
                  queryString.append(URLEncoder.encode(pair.getValue(), "UTF-8")).append("&");
              }
              if (queryString.length() > 0) {
                  queryString.deleteCharAt(queryString.length() - 1);
              }
  
              // 2. 拼接：URI + ? + QueryString + SK
              String wholeStr = uri + "?" + queryString.toString() + sk;
  
              // 3. 对整个拼接后的字符串再次进行URLEncode (这一步非常关键，官方文档强调的)
              String tempStr = URLEncoder.encode(wholeStr, "UTF-8");
  
              // 4. MD5加密
              return MD5(tempStr);
          } catch (UnsupportedEncodingException e) {
              e.printStackTrace();
              return null;
          }
      }
  
      /**
       * MD5计算辅助方法
       */
      private String MD5(String md5) {
          try {
              java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
              byte[] array = md.digest(md5.getBytes());
              StringBuilder sb = new StringBuilder();
              for (int i = 0; i < array.length; ++i) {
                  sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).substring(1, 3));
              }
              return sb.toString();
          } catch (NoSuchAlgorithmException e) {
              e.printStackTrace();
          }
          return null;
      }
  
  }

  总体代码如上