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- package com.szwl.util;
- import com.alibaba.fastjson.JSON;
- import org.springframework.http.MediaType;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import java.io.IOException;
- import java.io.UnsupportedEncodingException;
- import java.net.InetAddress;
- import java.net.URLEncoder;
- import java.net.UnknownHostException;
- import java.nio.charset.StandardCharsets;
- /**
- * @author wuhs
- * @date 2021-11-01 14:13
- */
- public class ServletUtil {
- /**
- * 组装下载文件请求体,防止中文乱码
- *
- * @param response
- * @param fileName
- * @return
- * @throws UnsupportedEncodingException
- */
- public static HttpServletResponse buildDownloadHeader(HttpServletResponse response, String fileName) throws UnsupportedEncodingException {
- response.reset();
- response.setCharacterEncoding("UTF-8");
- response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
- //防止中文乱码
- String percentEncodedFileName = percentEncode(fileName);
- StringBuilder contentDispositionValue = new StringBuilder();
- contentDispositionValue.append("attachment; filename=")
- .append(percentEncodedFileName)
- .append(";")
- .append("filename*=")
- .append("utf-8''")
- .append(percentEncodedFileName);
- response.setHeader("Content-disposition", contentDispositionValue.toString());
- return response;
- }
- /**
- * 百分号编码工具方法
- *
- * @param s 需要百分号编码的字符串
- * @return 百分号编码后的字符串
- */
- private static String percentEncode(String s) throws UnsupportedEncodingException {
- String encode = URLEncoder.encode(s, StandardCharsets.UTF_8.toString());
- return encode.replaceAll("\\+", "%20");
- }
- /**
- * 以json方式渲染到前端
- *
- * @param response
- * @param value
- */
- public static void renderJSON(HttpServletResponse response, Object value) throws IOException {
- response.setContentType("application/json;charset=UTF-8");
- response.getWriter().write(JSON.toJSONString(value));
- response.getWriter().flush();
- response.getWriter().close();
- }
- /**
- * 获取IP方法
- *
- * @author ruoyi
- */
- public static String getIpAddr(HttpServletRequest request) {
- if (request == null) {
- return "unknown";
- }
- String ip = request.getHeader("x-forwarded-for");
- if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
- ip = request.getHeader("Proxy-Client-IP");
- }
- if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
- ip = request.getHeader("X-Forwarded-For");
- }
- if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
- ip = request.getHeader("WL-Proxy-Client-IP");
- }
- if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
- ip = request.getHeader("X-Real-IP");
- }
- if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
- ip = request.getRemoteAddr();
- }
- return "0:0:0:0:0:0:0:1".equals(ip) ? "127.0.0.1" : ip;
- }
- public static boolean internalIp(String ip) {
- byte[] addr = textToNumericFormatV4(ip);
- return internalIp(addr) || "127.0.0.1".equals(ip);
- }
- private static boolean internalIp(byte[] addr) {
- if (addr == null || addr.length < 2) {
- return true;
- }
- final byte b0 = addr[0];
- final byte b1 = addr[1];
- // 10.x.x.x/8
- final byte SECTION_1 = 0x0A;
- // 172.16.x.x/12
- final byte SECTION_2 = (byte) 0xAC;
- final byte SECTION_3 = (byte) 0x10;
- final byte SECTION_4 = (byte) 0x1F;
- // 192.168.x.x/16
- final byte SECTION_5 = (byte) 0xC0;
- final byte SECTION_6 = (byte) 0xA8;
- switch (b0) {
- case SECTION_1:
- return true;
- case SECTION_2:
- if (b1 >= SECTION_3 && b1 <= SECTION_4) {
- return true;
- }
- case SECTION_5:
- switch (b1) {
- case SECTION_6:
- return true;
- }
- default:
- return false;
- }
- }
- /**
- * 将IPv4地址转换成字节
- *
- * @param text IPv4地址
- * @return byte 字节
- */
- public static byte[] textToNumericFormatV4(String text) {
- if (text.length() == 0) {
- return null;
- }
- byte[] bytes = new byte[4];
- String[] elements = text.split("\\.", -1);
- try {
- long l;
- int i;
- switch (elements.length) {
- case 1:
- l = Long.parseLong(elements[0]);
- if ((l < 0L) || (l > 4294967295L)) {
- return null;
- }
- bytes[0] = (byte) (int) (l >> 24 & 0xFF);
- bytes[1] = (byte) (int) ((l & 0xFFFFFF) >> 16 & 0xFF);
- bytes[2] = (byte) (int) ((l & 0xFFFF) >> 8 & 0xFF);
- bytes[3] = (byte) (int) (l & 0xFF);
- break;
- case 2:
- l = Integer.parseInt(elements[0]);
- if ((l < 0L) || (l > 255L)) {
- return null;
- }
- bytes[0] = (byte) (int) (l & 0xFF);
- l = Integer.parseInt(elements[1]);
- if ((l < 0L) || (l > 16777215L)) {
- return null;
- }
- bytes[1] = (byte) (int) (l >> 16 & 0xFF);
- bytes[2] = (byte) (int) ((l & 0xFFFF) >> 8 & 0xFF);
- bytes[3] = (byte) (int) (l & 0xFF);
- break;
- case 3:
- for (i = 0; i < 2; ++i) {
- l = Integer.parseInt(elements[i]);
- if ((l < 0L) || (l > 255L)) {
- return null;
- }
- bytes[i] = (byte) (int) (l & 0xFF);
- }
- l = Integer.parseInt(elements[2]);
- if ((l < 0L) || (l > 65535L)) {
- return null;
- }
- bytes[2] = (byte) (int) (l >> 8 & 0xFF);
- bytes[3] = (byte) (int) (l & 0xFF);
- break;
- case 4:
- for (i = 0; i < 4; ++i) {
- l = Integer.parseInt(elements[i]);
- if ((l < 0L) || (l > 255L)) {
- return null;
- }
- bytes[i] = (byte) (int) (l & 0xFF);
- }
- break;
- default:
- return null;
- }
- } catch (NumberFormatException e) {
- return null;
- }
- return bytes;
- }
- public static String getHostIp() {
- try {
- return InetAddress.getLocalHost().getHostAddress();
- } catch (UnknownHostException e) {
- }
- return "127.0.0.1";
- }
- public static String getHostName() {
- try {
- return InetAddress.getLocalHost().getHostName();
- } catch (UnknownHostException e) {
- }
- return "未知";
- }
- }
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