java读取jar包下resource文件

灰太狼 2023-10-04 19:19 111阅读 0赞

## **最近做一个项目，根据IP获取IP来源，用的ip2region** ##

![f0cbebe81fa74b4596706d6fa495e9e3.png][]

ip2region.xdb需要放到resource文件下进行读取，没打包之前，用以下方法可正常读取：

![0f0e26b0f647469998e467c9b61deecd.png][]打包之后发到服务器上后，则无法读取了，只要改成流读取就能成功了，

**第一种方法如下： 当前类名.class.getClassLoader().getResourceAsStream**("text.txt")

![d23056c3406946ebafc59d39d13dcfc9.png][]

**第二种方法，还可修改pom文件，如下(暂无验证)：**

![7e3eb26c02214636b94ea716c511f7cf.png][]

顺便附上根据请求获取IP以及IP来源代码,先引入jar包

![b1aac485dcb3474daba25211aaf7a382.png][]

/**
         * 获取当前网络ip
         *
         * @param request
         * @return
         */
        public static String getIpAddr(HttpServletRequest request) {
            String ipAddress = request.getHeader("x-forwarded-for");
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("WL-Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getRemoteAddr();
                if (ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")) {
                    //根据网卡取本机配置的IP
                    InetAddress inet = null;
                    try {
                        inet = InetAddress.getLocalHost();
                    } catch (UnknownHostException e) {
                        e.printStackTrace();
                    }
                    ipAddress = inet.getHostAddress();
                }
            }
            //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
            if (ipAddress != null && ipAddress.length() > 15) { //"***.***.***.***".length() = 15
                if (ipAddress.indexOf(",") > 0) {
                    ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
                }
            }
            return ipAddress;
        }
    
    
     
        /**
         * 根据IP获取城市信息
         * @param ip
         * @return
         */
        public static String getCityInfo(String ip) {
            try {
                if(org.springframework.util.StringUtils.isEmpty(ip)){
                    return null;
                }
                // 通过流读取，方式1
                InputStream in1 = HttpUtils.class.getClassLoader().getResourceAsStream("ip2region.xdb");
                // 1、创建 searcher 对象
                Searcher searcher = null;
                try {
                    searcher = Searcher.newWithBuffer(inputStreamToByteArray(in1));
                } catch (IOException e) {
                    System.out.println("Error: Invalid ip2region.xdb file, filePath：");
                    return null;
                }
                // 2、查询
                try {
                    String region = searcher.search(ip);
                    return region;
                } catch (Exception e) {
                    System.out.printf("failed to search(%s): %s\n", ip, e);
                }
                // 3、关闭资源
                searcher.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            return "";
        }
    
        /**
         * inputStream转byte数组
         *
         * @param inputStream 输入流对象
         * @return byte数组
         */
        public static byte[] inputStreamToByteArray(InputStream inputStream) {
            try (ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream()) {
                byte[] buffer = new byte[1024];
                int num;
                while ((num = inputStream.read(buffer)) != -1) {
                    byteArrayOutputStream.write(buffer, 0, num);
                }
                byteArrayOutputStream.flush();
                return byteArrayOutputStream.toByteArray();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return new byte[]{};
        }

[f0cbebe81fa74b4596706d6fa495e9e3.png]: https://img-blog.csdnimg.cn/f0cbebe81fa74b4596706d6fa495e9e3.png
[0f0e26b0f647469998e467c9b61deecd.png]: https://img-blog.csdnimg.cn/0f0e26b0f647469998e467c9b61deecd.png
[d23056c3406946ebafc59d39d13dcfc9.png]: https://img-blog.csdnimg.cn/d23056c3406946ebafc59d39d13dcfc9.png
[7e3eb26c02214636b94ea716c511f7cf.png]: https://img-blog.csdnimg.cn/7e3eb26c02214636b94ea716c511f7cf.png
[b1aac485dcb3474daba25211aaf7a382.png]: https://img-blog.csdnimg.cn/b1aac485dcb3474daba25211aaf7a382.png