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@@ -0,0 +1,227 @@
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+package com.szwl.util;
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+
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+import com.alibaba.fastjson.JSON;
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+import org.springframework.http.MediaType;
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+
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+import javax.servlet.http.HttpServletRequest;
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+import javax.servlet.http.HttpServletResponse;
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+import java.io.IOException;
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+import java.io.UnsupportedEncodingException;
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+import java.net.InetAddress;
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+import java.net.URLEncoder;
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+import java.net.UnknownHostException;
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+import java.nio.charset.StandardCharsets;
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+
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+/**
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+ * @author wuhs
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+ * @date 2021-11-01 14:13
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+ */
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+public class ServletUtil {
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+
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+ /**
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+ * 组装下载文件请求体,防止中文乱码
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+ *
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+ * @param response
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+ * @param fileName
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+ * @return
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+ * @throws UnsupportedEncodingException
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+ */
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+ public static HttpServletResponse buildDownloadHeader(HttpServletResponse response, String fileName) throws UnsupportedEncodingException {
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+ response.reset();
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+ response.setCharacterEncoding("UTF-8");
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+ response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
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+ //防止中文乱码
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+ String percentEncodedFileName = percentEncode(fileName);
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+ StringBuilder contentDispositionValue = new StringBuilder();
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+ contentDispositionValue.append("attachment; filename=")
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+ .append(percentEncodedFileName)
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+ .append(";")
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+ .append("filename*=")
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+ .append("utf-8''")
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+ .append(percentEncodedFileName);
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+ response.setHeader("Content-disposition", contentDispositionValue.toString());
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+ return response;
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+ }
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+
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+ /**
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+ * 百分号编码工具方法
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+ *
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+ * @param s 需要百分号编码的字符串
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+ * @return 百分号编码后的字符串
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+ */
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+ private static String percentEncode(String s) throws UnsupportedEncodingException {
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+ String encode = URLEncoder.encode(s, StandardCharsets.UTF_8.toString());
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+ return encode.replaceAll("\\+", "%20");
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+ }
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+
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+ /**
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+ * 以json方式渲染到前端
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+ *
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+ * @param response
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+ * @param value
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+ */
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+ public static void renderJSON(HttpServletResponse response, Object value) throws IOException {
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+ response.setContentType("application/json;charset=UTF-8");
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+ response.getWriter().write(JSON.toJSONString(value));
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+ response.getWriter().flush();
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+ response.getWriter().close();
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+ }
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+
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+ /**
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+ * 获取IP方法
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+ *
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+ * @author ruoyi
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+ */
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+ public static String getIpAddr(HttpServletRequest request) {
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+ if (request == null) {
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+ return "unknown";
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+ }
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+ String ip = request.getHeader("x-forwarded-for");
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+ if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
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+ ip = request.getHeader("Proxy-Client-IP");
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+ }
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+ if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
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+ ip = request.getHeader("X-Forwarded-For");
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+ }
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+ if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
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+ ip = request.getHeader("WL-Proxy-Client-IP");
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+ }
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+ if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
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+ ip = request.getHeader("X-Real-IP");
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+ }
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+
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+ if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
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+ ip = request.getRemoteAddr();
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+ }
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+
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+ return "0:0:0:0:0:0:0:1".equals(ip) ? "127.0.0.1" : ip;
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+ }
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+
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+ public static boolean internalIp(String ip) {
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+ byte[] addr = textToNumericFormatV4(ip);
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+ return internalIp(addr) || "127.0.0.1".equals(ip);
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+ }
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+
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+ private static boolean internalIp(byte[] addr) {
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+ if (addr == null || addr.length < 2) {
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+ return true;
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+ }
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+ final byte b0 = addr[0];
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+ final byte b1 = addr[1];
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+ // 10.x.x.x/8
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+ final byte SECTION_1 = 0x0A;
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+ // 172.16.x.x/12
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+ final byte SECTION_2 = (byte) 0xAC;
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+ final byte SECTION_3 = (byte) 0x10;
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+ final byte SECTION_4 = (byte) 0x1F;
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+ // 192.168.x.x/16
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+ final byte SECTION_5 = (byte) 0xC0;
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+ final byte SECTION_6 = (byte) 0xA8;
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+ switch (b0) {
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+ case SECTION_1:
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+ return true;
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+ case SECTION_2:
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+ if (b1 >= SECTION_3 && b1 <= SECTION_4) {
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+ return true;
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+ }
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+ case SECTION_5:
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+ switch (b1) {
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+ case SECTION_6:
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+ return true;
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+ }
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+ default:
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+ return false;
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+ }
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+ }
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+
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+ /**
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+ * 将IPv4地址转换成字节
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+ *
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+ * @param text IPv4地址
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+ * @return byte 字节
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+ */
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+ public static byte[] textToNumericFormatV4(String text) {
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+ if (text.length() == 0) {
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+ return null;
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+ }
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+
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+ byte[] bytes = new byte[4];
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+ String[] elements = text.split("\\.", -1);
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+ try {
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+ long l;
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+ int i;
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+ switch (elements.length) {
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+ case 1:
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+ l = Long.parseLong(elements[0]);
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+ if ((l < 0L) || (l > 4294967295L)) {
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+ return null;
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+ }
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+ bytes[0] = (byte) (int) (l >> 24 & 0xFF);
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+ bytes[1] = (byte) (int) ((l & 0xFFFFFF) >> 16 & 0xFF);
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+ bytes[2] = (byte) (int) ((l & 0xFFFF) >> 8 & 0xFF);
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+ bytes[3] = (byte) (int) (l & 0xFF);
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+ break;
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+ case 2:
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+ l = Integer.parseInt(elements[0]);
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+ if ((l < 0L) || (l > 255L)) {
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+ return null;
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+ }
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+ bytes[0] = (byte) (int) (l & 0xFF);
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+ l = Integer.parseInt(elements[1]);
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+ if ((l < 0L) || (l > 16777215L)) {
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+ return null;
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+ }
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+ bytes[1] = (byte) (int) (l >> 16 & 0xFF);
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+ bytes[2] = (byte) (int) ((l & 0xFFFF) >> 8 & 0xFF);
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+ bytes[3] = (byte) (int) (l & 0xFF);
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+ break;
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+ case 3:
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+ for (i = 0; i < 2; ++i) {
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+ l = Integer.parseInt(elements[i]);
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+ if ((l < 0L) || (l > 255L)) {
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+ return null;
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+ }
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+ bytes[i] = (byte) (int) (l & 0xFF);
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+ }
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+ l = Integer.parseInt(elements[2]);
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+ if ((l < 0L) || (l > 65535L)) {
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+ return null;
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+ }
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+ bytes[2] = (byte) (int) (l >> 8 & 0xFF);
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+ bytes[3] = (byte) (int) (l & 0xFF);
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+ break;
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+ case 4:
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+ for (i = 0; i < 4; ++i) {
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+ l = Integer.parseInt(elements[i]);
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+ if ((l < 0L) || (l > 255L)) {
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+ return null;
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+ }
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+ bytes[i] = (byte) (int) (l & 0xFF);
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+ }
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+ break;
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+ default:
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+ return null;
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+ }
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+ } catch (NumberFormatException e) {
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+ return null;
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+ }
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+ return bytes;
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+ }
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+
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+ public static String getHostIp() {
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+ try {
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+ return InetAddress.getLocalHost().getHostAddress();
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+ } catch (UnknownHostException e) {
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+ }
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+ return "127.0.0.1";
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+ }
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+
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+ public static String getHostName() {
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+ try {
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+ return InetAddress.getLocalHost().getHostName();
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+ } catch (UnknownHostException e) {
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+ }
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+ return "未知";
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+ }
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+
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+}
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