java如何根据IP获取当前区域天气信息详解

/**
 * @Description：获取客户端外网ip 此方法要接入互联网才行，内网不行
 **/
public static String getPublicIp() {
    try {
        String path = "http://www.net.cn/static/customercare/yourip.asp";// 要获得html页面内容的地址(万网)

        URL url = new URL(path);// 创建url对象

        HttpURLConnection conn = (HttpURLConnection) url.openConnection();// 打开连接

        conn.setRequestProperty("contentType", "GBK"); // 设置url中文参数编码

        conn.setConnectTimeout(5 * 1000);// 请求的时间

        conn.setRequestMethod("GET");// 请求方式

        InputStream inStream = conn.getInputStream();
        // readLesoSysXML(inStream);

        BufferedReader in = new BufferedReader(new InputStreamReader(
                inStream, "GBK"));
        StringBuilder buffer = new StringBuilder();
        String line;
        // 读取获取到内容的最后一行,写入
        while ((line = in.readLine()) != null) {
            buffer.append(line);
        }
        List<String> ips = new ArrayList<>();

        //用正则表达式提取String字符串中的IP地址
        String regEx="((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)";
        String str = buffer.toString();
        Pattern p = Pattern.compile(regEx);
        Matcher m = p.matcher(str);
        while (m.find()) {
            String result = m.group();
            ips.add(result);
        }

        // 返回公网IP值
        return ips.get(0);

    } catch (Exception e) {
        System.out.println("获取公网IP连接超时");
        return "";
    }
}

<!--ip2region-->
<dependency>
    <groupId>org.lionsoul</groupId>
    <artifactId>ip2region</artifactId>
    <version>1.7.2</version>
</dependency>

@Log4j2
public class IPUtils {

    /**
     * 根据IP获取地址
     *
     * @return 国家|区域|省份|城市|ISP
     */
    public static String getAddress(String ip) {
        return getAddress(ip, DbSearcher.BTREE_ALGORITHM);
    }

    /**
     * 根据IP获取地址
     *
     * @param ip
     * @param algorithm 查询算法
     * @return 国家|区域|省份|城市|ISP
     * @see DbSearcher
     * DbSearcher.BTREE_ALGORITHM; //B-tree
     * DbSearcher.BINARY_ALGORITHM //Binary
     * DbSearcher.MEMORY_ALGORITYM //Memory
     */
    @SneakyThrows
    public static String getAddress(String ip, int algorithm) {
        if (!Util.isIpAddress(ip)) {
            log.error("错误格式的ip地址: {}", ip);
            return "";
        }
        String dbPath = IPUtils.class.getResource("/db/ip2region.db").getPath();
        File file = new File(dbPath);
        if (!file.exists()) {
            log.error("地址库文件不存在");
            return "";
        }
        DbSearcher searcher = new DbSearcher(new DbConfig(), dbPath);
        DataBlock dataBlock;
        switch (algorithm) {
            case DbSearcher.BTREE_ALGORITHM:
                dataBlock = searcher.btreeSearch(ip);
                break;
            case DbSearcher.BINARY_ALGORITHM:
                dataBlock = searcher.binarySearch(ip);
                break;
            case DbSearcher.MEMORY_ALGORITYM:
                dataBlock = searcher.memorySearch(ip);
                break;
            default:
                log.error("未传入正确的查询算法");
                return "";
        }
        searcher.close();
        return dataBlock.getRegion();
    }

@GetMapping("/weather")
@DecryptBody(encode = true) //响应加密
public Result getWeather(){
    String publicIp = GetIPUtils.getPublicIp();//获取外网IP
    if (StringUtils.isBlank(publicIp)) return ResultUtils.error("获取失败");
    String cityInfo = IPUtils.getAddress(publicIp);//国家|区域|省份|城市|ISP
    if (StringUtils.isBlank(cityInfo)) return ResultUtils.error("获取失败");
    String[] split = cityInfo.split("\|");
    String city = "";
    for (String aSplit : split) if (aSplit.contains("市")) city = aSplit;//拿取市级名称
    if (StringUtils.isBlank(city)) return ResultUtils.error("获取失败");
    String weatherInformation = HttpUtil.get("http://portalweather.comsys.net.cn/weather03/api/weatherService/getDailyWeather?cityName=" + city);//调用天气接口
    if (StringUtils.isBlank(weatherInformation)) return ResultUtils.error("获取失败");
    Object o = ObjectMapperUtils.strToObj(weatherInformation,Object.class);
    return ResultUtils.success("获取成功",o);
}