大气设备农耕

zhanzhiqin

2022-10-14 ea8e8e7dd5f10cff4054f5fde8fd3961aaac1834

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package com.sandu.ximon.admin.manager.iot.rrpc.util;
 
import com.sandu.ximon.admin.dto.RemoteFileDto;
import com.sandu.ximon.admin.utils.HexUtils;
import com.sandu.ximon.admin.utils.StringUtil;
 
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
 
/**
 * @author ZZQ
 * @date 2022/5/5 14:26
 */
public class FileProcessingUtils {
    private static final int readSize = 512;
 
    public static RemoteFileDto read(String filePath) {
        //文件地址为空
        if (filePath == null) {
            return null;
        }
        List<String> data = new ArrayList<>();
        // 取数据长度
        int dataSize = 0;
        StringBuffer fileHexStr = new StringBuffer();
        try {
            // 创建URL
            URL url = new URL(filePath);
            // 试图连接并取得返回状态码
            URLConnection urlconn = url.openConnection();
            urlconn.connect();
            HttpURLConnection httpconn = (HttpURLConnection) urlconn;
            int HttpResult = httpconn.getResponseCode();
            if (HttpResult != HttpURLConnection.HTTP_OK) {
                System.out.print("无法连接到");
                return null;
            } else {
                InputStream in = urlconn.getInputStream();
 
                // 一次性取多少个字节
                byte[] bytes = new byte[readSize];
                // 读取到的字节数组长度，为-1时表示没有数据
                int length = 0;
                // 循环取数据
                while ((length = in.read(bytes)) != -1) {
                    String temp = HexUtils.encodeHexStr(Arrays.copyOf(bytes, length));
                    if (!StringUtil.strIsNullOrEmpty(temp)) {
                        fileHexStr.append(temp);
                        dataSize += length;
                    }
                }
 
                in.close();
                //按每帧数据大小进行切割截取数据
                String tempHexStr = fileHexStr.toString();
                int c = readSize * 2;
                int cl = -1;
                while (!StringUtil.strIsNullOrEmpty(tempHexStr)) {
                    if (tempHexStr.length() > c) {
                        cl = c;
                    } else {
                        cl = tempHexStr.length();
                    }
                    data.add(tempHexStr.substring(0, cl));
                    tempHexStr = tempHexStr.substring(cl, tempHexStr.length());
                }
 
                RemoteFileDto remoteFileDto = new RemoteFileDto();
                remoteFileDto.setList(data);
                remoteFileDto.setListSize(dataSize);
                remoteFileDto.setFileHexStr(fileHexStr.toString());
                return remoteFileDto;
            }
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
 
    public static void main(String[] args) {
        RemoteFileDto t = read("https://ximonsmart.oss-cn-shanghai.aliyuncs.com/20220507175550f1c437-e2f6-413f-9a78-c1cfea3d2a82.bin");
        System.out.println(t.getListSize());
        System.out.println(t.getList().size());
    }
}