帮忙看一段代码，关于音乐文件在服务器端的存放位置。。 谁给我讲解一下， 加一点注释最好，谢谢！

Question

private void generatePlayListFile(Song[] songs)throws Exception{
ServletRequest request = ServletActionContext.getRequest();
localAddr = "http://" + request.getLocalAddr() + ":8080" + "/popmusic";
songListFileName += ".m3u";
String songListLocation = request.getRealPath("/upload") + "/" + songListFileName;
PrintWriter out = new PrintWriter(new OutputStreamWriter(new FileOutputStream(songListLocation))); for(int i = 0; i < songIds.length; i++){
String tempLocation = songs[i].getLocation();
String songFileName = tempLocation.substring(tempLocation.lastIndexOf("/") + 1);
out.println(songFileName);
}
out.close();
}

Answer 1

上面代码不全，少一些，重新附上。private Long[] songIds;
private String songListFileName="";
private SongManageService songManageService;
private String localAddr;
private Map<Song, Set<Singer>> songSingerMap = new HashMap<Song, Set<Singer>>();
private Logger logger = Logger.getLogger(PlaySongAction.class);

public String execute()throws Exception{

  Song[] songs = new Song[songIds.length];
for(int i = 0; i < songIds.length; i++){
songListFileName += songIds[i] + "_";
songs[i] = songManageService.getSongById(songIds[i]);
}
generatePlayListFile(songs);

return SUCCESS;
}private void generatePlayListFile(Song[] songs)throws Exception{
ServletRequest request = ServletActionContext.getRequest();
localAddr = "http://" + request.getLocalAddr() + ":8080" + "/popmusic";
songListFileName += ".m3u";
String songListLocation = request.getRealPath("/upload") + "/" + songListFileName;
PrintWriter out = new PrintWriter(new OutputStreamWriter(new FileOutputStream(songListLocation))); for(int i = 0; i < songIds.length; i++){
String tempLocation = songs[i].getLocation();
String songFileName = tempLocation.substring(tempLocation.lastIndexOf("/") + 1);
out.println(songFileName);
}
out.close();
}