文件上传下载功能
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package com.njcn.access.utils;
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import org.springframework.stereotype.Component;
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/**
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* @author xy
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*/
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@Component
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public class CRC32Utils {
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// CRC-32/MPEG-2 多项式, x^32 + x^26 + x^23 + x^22 + x^16 + x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x + 1
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private static final int POLYNOMIAL = 0x04C11DB7;
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public static int calculateCRC32(byte[] buf, int len, int seed) {
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if (buf == null || len <= 0) {
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return seed;
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}
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int crc = seed;
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int count = 0;
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// 对长度进行填充以适应32位整数
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int rem = len % Integer.BYTES;
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if (rem > 0) {
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int n = Integer.BYTES - rem;
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byte[] newBuf = new byte[len + n];
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System.arraycopy(buf, 0, newBuf, 0, len);
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// 填充字节用0xFF
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for (int i = len; i < len + n; i++) {
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newBuf[i] = (byte) 0xFF;
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}
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buf = newBuf;
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len += n;
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}
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int uiCount = len / Integer.BYTES;
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for (int k = 0; k < uiCount; k++) {
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int uiTemp = 0;
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for (int i = 0; i < Integer.BYTES; i++) {
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uiTemp |= (buf[k * Integer.BYTES + i] & 0xFF) << (8 * (3 - i));
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}
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for (int j = 0; j < 32; j++) {
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// 检查最高位是否为1
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if ((crc ^ uiTemp) < 0) {
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crc = 0x04C11DB7 ^ (crc << 1);
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count ++;
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} else {
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crc <<= 1;
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}
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uiTemp <<= 1;
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}
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}
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return crc;
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}
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}
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@@ -0,0 +1,45 @@
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package com.njcn.access.utils;
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import org.springframework.stereotype.Component;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* @author xy
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*/
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@Component
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public class ChannelObjectUtil {
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/**
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* 将list转成对应实体
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* @param object
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* @param clazz
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* @return
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* @param <T>
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*/
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public <T> List<T> objectToList(Object object, Class<T> clazz) {
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List<T> resultList = new ArrayList<>();
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if (object instanceof List<?>) {
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for (Object o : (List<?>) object) {
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resultList.add(clazz.cast(o));
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}
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}
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return resultList;
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}
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/**
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* 将object转成对应实体
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* @param object
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* @param clazz
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* @return
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* @param <T>
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*/
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public <T> T objectToSingleObject(Object object, Class<T> clazz) {
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if (clazz.isInstance(object)) {
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return clazz.cast(object);
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}
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// 或者抛出异常，根据您的需求
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return null;
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}
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}
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@@ -0,0 +1,94 @@
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package com.njcn.access.utils;
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import java.io.*;
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import java.nio.charset.StandardCharsets;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.Random;
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/**
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* 类的介绍：
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*
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* @author xuyang
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* @version 1.0.0
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* @createTime 2023/4/10 16:03
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*/
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public class JsonUtil {
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/**
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* @param jsonString 要保存的JSON串
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* @param filePath 保存到的文件路径
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* @param fileName 文件名称
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* @return
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*/
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//保存json 文件
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public static boolean createJsonFile(String jsonString, String filePath, String fileName) {
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// 标记文件生成是否成功
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boolean flag = true;
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// 拼接文件完整路径
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String fullPath = filePath + File.separator + fileName + ".json";
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// 生成json格式文件
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try {
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// 保证创建一个新文件
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File file = new File(fullPath);
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// 如果父目录不存在，创建父目录
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if (!file.getParentFile().exists()) {
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file.getParentFile().mkdirs();
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}
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// 如果已存在,删除旧文件
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if (file.exists()) {
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file.delete();
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}
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file.createNewFile();
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// 格式化json字符串
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//jsonString = JsonFormatTool.formatJson2(jsonString);
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// 将格式化后的字符串写入文件
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Writer write = new OutputStreamWriter(new FileOutputStream(file), StandardCharsets.UTF_8);
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write.write(jsonString);
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write.flush();
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write.close();
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} catch (Exception e) {
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flag = false;
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e.printStackTrace();
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}
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// 返回是否成功的标记
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return flag;
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}
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/**
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* 生成随机文件名：当前年月日时分秒+五位随机数
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* @return
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*/
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public static String getRandomFileName() {
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SimpleDateFormat simpleDateFormat;
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simpleDateFormat = new SimpleDateFormat("yyyyMMdd");
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Date date = new Date();
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String str = simpleDateFormat.format(date);
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Random random = new Random();
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// 获取5位随机数
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int ranNum = (int) (random.nextDouble() * (99999 - 10000 + 1)) + 10000;
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// 当前时间
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return ranNum + str;
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}
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public static String convertStreamToString(InputStream inputStream){
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BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
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StringBuilder sb = new StringBuilder();
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String line = null;
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try {
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while ((line = reader.readLine()) != null) {
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sb.append(line);
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}
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} catch (IOException e) {
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e.printStackTrace();
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} finally {
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try {
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inputStream.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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return sb.toString();
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}
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}
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@@ -0,0 +1,53 @@
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package com.njcn.access.utils;
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import com.alibaba.nacos.shaded.com.google.common.reflect.TypeToken;
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import com.alibaba.nacos.shaded.com.google.gson.Gson;
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import com.njcn.access.config.MqttInfo;
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import com.njcn.access.pojo.dto.mqtt.MqttClientDto;
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import lombok.AllArgsConstructor;
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import lombok.Data;
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import okhttp3.Credentials;
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import okhttp3.OkHttpClient;
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import okhttp3.Request;
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import okhttp3.Response;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.core.annotation.Order;
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import java.io.IOException;
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import java.util.Objects;
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/**
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* 类的介绍：
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*
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* @author xuyang
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* @version 1.0.0
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* @createTime 2023/7/14 14:44
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*/
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@Data
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@Order(100)
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@Configuration
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@AllArgsConstructor
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public class MqttUtil {
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private final MqttInfo mqttInfo;
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public boolean judgeClientOnline(String id) {
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boolean result = false;
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try {
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Gson gson = new Gson();
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OkHttpClient client = new OkHttpClient();
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Request request = new Request.Builder()
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.url(mqttInfo.getUrl() + "/api/v5/clients/" + id)
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.header("Content-Type", "application/json")
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.header("Authorization", Credentials.basic(mqttInfo.getUserName(), mqttInfo.getPassword()))
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.build();
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Response response = client.newCall(request).execute();
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response.body();
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MqttClientDto mqttClientDto = gson.fromJson(Objects.requireNonNull(response.body()).string(), new TypeToken<MqttClientDto>(){}.getType());
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result = mqttClientDto.isConnected();
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} catch (IOException e) {
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e.printStackTrace();
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}
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return result;
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}
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}
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