如何在J2ME中加速加载资源文件

Question

我正在使用J2ME Wireless Toolkit 2.2编写一个J2ME应用程序我有以下代码:

public class BusReader
{
  private String[] fileNames;
  private final String allFilesInfoFile = "files_in_dir";
  public BusReader ()
  {
  fileNames = getFileNames ();
  String busNo = getBusNo ("BusNo1p.bin");
  }
  public String[] getAllBusFiles ()
  {
  return fileNames;
  }
  public String getBusNo (String fileName)
  {
  String[] fileLines = loadResourceFile (fileName);
  int linesCount = fileLines.length;
  for (int i=0;i<linesCount;++i)
    if (fileLines[i].equals ("[BusNo]") && i < linesCount-1)
      return fileLines[i+1];
  return null;
  }
  public String getDefaultDirection (String fileName)
  {
  String[] fileLines = loadResourceFile (fileName);
  int linesCount = fileLines.length;
  for (int i=0;i<linesCount;++i)
    if (fileLines[i].equals ("[BusDirection]") && i < linesCount-1)
      return fileLines[i+1];
  return null;
  }
  private String[] getFileNames ()
  {
  return loadResourceFile (allFilesInfoFile);
  }
  private String[] loadResourceFile (String fileName)
  {
  String content = "";
    try
    {
    Reader in = new InputStreamReader(this.getClass().getResourceAsStream(fileName), "iso-8859-2");
    StringBuffer temp = new StringBuffer(1024);
    char[] buffer = new char[1024];
    int read;
    while ((read=in.read(buffer, 0, buffer.length)) != -1)
      temp.append(buffer, 0, read);
    content = temp.toString();
    } catch (IOException e) {
    return null;
    }
  int len = content.length ();
    if (content.charAt (len-1) == 'n' && content.charAt (len-2) == 'r')
    {
    String newContent = "";
      for (int i=0;i<len-2;++i)
        newContent += content.charAt (i);
    content = newContent;
    }
  String[] fileLines = TString.Split ("rn", new TString(content));
  for (int i=0;i<fileLines.length; ++i)
  {
    fileLines[i] = fileLines[i].trim ();
      if (fileLines[i].length () == 0)
        fileLines[i] = "";
  }
  return fileLines;
  }
}

一切工作正常，但问题是，当我试图复制我的应用程序到手机。在我的手机上，当我打开应用程序之前，应用程序显示我必须等待35秒。这是因为，构造函数执行了两次函数:

loadResourceFile (String fileName)

加载资源文件。函数正在加载的文件大小为:1.22KB和29KB。问题是:如何加速加载功能(loadResourceFile)?

我试图创建java类文件作为资源数据，但它超出了java内存限制。我将数组String[][][][]更改为String[][][]，它在15秒内加载到我的手机上。我想当我将加载数据作为资源时，它会工作得更快。手机:Nokia 3110c

Answer 1

我找到了。它是以下几行(花了35秒):

if (content.charAt (len-1) == 'n' && content.charAt (len-2) == 'r')
{
String newContent = "";
  for (int i=0;i<len-2;++i)
    newContent += content.charAt (i);
content = newContent;
}