import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;


import java.io.*;
import java.net.*;
import java.util.*;


public class NetRequest_Music {


    HashMap<String, String> getMusicList(String serchkey) {
        try {
            serchkey = URLEncoder.encode(serchkey, "UTF-8");


            String stringUrl = "http://www.kuwo.cn/api/www/search/searchMusicBykeyWord?key=" + serchkey + "&pn=1&rn=30&httpsStatus=1&reqId=7351da11-f940-11ec-97d0-5b5ac2228900";
            URL url = new URL(stringUrl);

            System.out.println(url);
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setRequestMethod("GET");


            httpURLConnection.setRequestProperty("Cookie", "_ga=GA1.2.1199988116.1656681561; _gid=GA1.2.1623023781.1656681561; _gat=1; Hm_lvt_cdb524f42f0ce19b169a8071123a4797=1656681561; Hm_lpvt_cdb524f42f0ce19b169a8071123a4797=1656681561; kw_token=6H8JN2KUMWF");
            httpURLConnection.setRequestProperty("Referer", "http://www.kuwo.cn/search/list?key=徐良");
            httpURLConnection.setRequestProperty("csrf", "6H8JN2KUMWF");
            httpURLConnection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36");

            httpURLConnection.setConnectTimeout(100000);
            httpURLConnection.setReadTimeout(100000);
            httpURLConnection.setDoInput(true);


            httpURLConnection.connect();

            if (httpURLConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                System.out.println("------>responsecode" + 200);
                InputStream inputStream = httpURLConnection.getInputStream();
                byte[] blist = new byte[1024];
                StringBuffer stringBuffer = new StringBuffer();
                int s;
                while ((s = inputStream.read(blist)) != -1) {
                    stringBuffer.append(new String(blist, 0, s));
                }
                String musicurl = stringBuffer.toString();


                JSONObject jsonObject = JSON.parseObject(musicurl);

                JSONArray infolist = jsonObject.getJSONObject("data").getJSONArray("list");

                HashMap<String, String> ridWithSongHashMap = new HashMap<>();

                int i = 0;

                for (Object j : infolist
                ) {
                    JSONObject jj = (JSONObject) j;
                    ridWithSongHashMap.put(jj.getString("rid"), jj.getString("name"));
                }


                inputStream.close();
                return ridWithSongHashMap;
            } else {
                System.out.println(httpURLConnection.getResponseCode() + "------->连接失败");
            }
        } catch (IOException unsupportedEncodingException) {
            unsupportedEncodingException.printStackTrace();
        }

        return null;
    }

    String searchSongUrl(String mid) {

        try {
            URL url = new URL("https://www.kuwo.cn/api/v1/www/music/playUrl?format=mp3&mid=" + mid + "&response=url&type=convert_url3&br=128kmp3&from=web");
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setRequestMethod("GET");
            httpURLConnection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36");
            httpURLConnection.setRequestProperty("Cookie", "Hm_lvt_cdb524f42f0ce19b169a8071123a4797=1577029678,1577034191,1577034210,1577076651; Hm_lpvt_cdb524f42f0ce19b169a8071123a4797=1577080777; kw_token=RUJ53PGJ4ZD");
            httpURLConnection.setRequestProperty("Referer", "http://www.kuwo.cn/search/list?key=%E5%91%A8%E6%9D%B0%E4%BC%A6");

            httpURLConnection.setConnectTimeout(100000);
            httpURLConnection.setReadTimeout(100000);
            httpURLConnection.setDoInput(true);


            httpURLConnection.connect();

            if (httpURLConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                System.out.println("------>responsecode" + 200);
                InputStream inputStream = httpURLConnection.getInputStream();
                byte[] blist = new byte[1024];
                StringBuffer stringBuffer = new StringBuffer();
                int s;
                while ((s = inputStream.read(blist)) != -1) {
                    stringBuffer.append(new String(blist, 0, s));
                }
                String musicurl = stringBuffer.toString();

                JSONObject jsonObject = JSON.parseObject(musicurl);
                System.out.println(jsonObject.getJSONObject("data").getString("url"));

                inputStream.close();
                return url.toString();
            } else {
                System.out.println(httpURLConnection.getResponseCode() + "------->连接失败");
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }


     static  void    downloadMusic(String musicurl, String musicname) {
        try {

            URL url = new URL(musicurl);
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setRequestMethod("GET");

            httpURLConnection.setConnectTimeout(100000);
            httpURLConnection.setReadTimeout(100000);
            httpURLConnection.setDoInput(true);

            httpURLConnection.connect();
            if (httpURLConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                System.out.println("------>responsecode" + 200 + "---------->" + musicname + "歌曲下载请求成功");
                InputStream inputStream = httpURLConnection.getInputStream();

                byte[] blist = new byte[1024];
                File file = new File("C:\\Users\\23524\\Desktop\\music\\" + musicname + ".mp3");
                FileOutputStream outputstream = new FileOutputStream(file);


                int len = 0;
                int progress = 0;
                while ((len = inputStream.read(blist)) != -1) {
                    outputstream.write(blist, 0, len);
                    progress++;
                    float result = 0;
                    if ((progress % 512) == 0) {
                        System.out.println(progress / 512 * 0.5 + "MB");
                    }
                }
                float size = file.length() * 1.0f / 1024 / 1024;

                System.out.println(musicname + "下载完毕，文件大小为" + (size - size % 0.01f) + "MB");

                outputstream.flush();
                outputstream.close();
                inputStream.close();


            } else {
                System.out.println(httpURLConnection.getResponseCode() + "------->连接失败");
            }

        } catch (IOException ioe) {
            ioe.printStackTrace();
        }


    }


    public static void main(String[] args) throws UnsupportedEncodingException {
        NetRequest_Music n = new NetRequest_Music();
//        n.searchSongUrl("324243");

//        n.downloadMusic("https://other-web-nf01-sycdn.kuwo.cn/d4f9fca65db317cf79b18366f6991699/62bf13e9/resource/n3/24/3/2525850365.mp3", "玫瑰花的葬礼");
//        n.downloadMusic("https://other-web-rg01-sycdn.kuwo.cn/c6d9d08473569f74f20947f1f49164fd/62bf13ea/resource/n1/76/69/2539603307.mp3", "千古");

//        n.getMusicList("徐良");

        HashMap<String,String> listMap= n.getMusicList("许嵩");
        Set<String> ks = listMap.keySet();
        for (String k:ks
             ) {
            NetRequest_Music.downloadMusic(n.searchSongUrl(k),listMap.get(k));
        }
        
    }

}代码如上，结果就是一条一条写爬取一首歌可以，但是一旦放到foreach中，就会

爬取一点，每个文件都只有两百多字节。求解答为什么。