将minecraft数据存储在当前目录中

Question

编辑:使用不同的反编译器现在包含Util$OS.class文件

我正试图修改mine craft launcher以检查当前工作目录中的minecraft文件夹，如果不存在，则使用已建立的例程来Crete并下载所需的文件。这是我第一次尝试java编程，所以我感到有点失落。下面是有问题的类文件的源代码:(我认为需要修改的块从第15行开始)

文件Util.class

package net.minecraft;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.lang.reflect.Method;
import java.net.URI;
import java.net.URL;
import java.security.PublicKey;
import java.security.cert.Certificate;
import javax.net.ssl.HttpsURLConnection;
public class Util
{
  private static File workDir = null;
  public static File getWorkingDirectory() {
    if (workDir == null) workDir = getWorkingDirectory("minecraft");
    return workDir;
  }
  public static File getWorkingDirectory(String applicationName) {
    String userHome = System.getProperty("user.home", ".");
    File workingDirectory;
    File workingDirectory;
    File workingDirectory;
    File workingDirectory;
    switch ($SWITCH_TABLE$net$minecraft$Util$OS()[getPlatform().ordinal()]) {
    case 1:
    case 2:
      workingDirectory = new File(userHome, '.' + applicationName + '/');
      break;
    case 3:
      String applicationData = System.getenv("APPDATA");
      File workingDirectory;
      if (applicationData != null) workingDirectory = new File(applicationData, "." + applicationName + '/'); else
        workingDirectory = new File(userHome, '.' + applicationName + '/');
      break;
    case 4:
      workingDirectory = new File(userHome, "Library/Application Support/" + applicationName);
      break;
    default:
      workingDirectory = new File(userHome, applicationName + '/');
    }
    if ((!workingDirectory.exists()) && (!workingDirectory.mkdirs())) throw new RuntimeException("The working directory could not be created: " + workingDirectory);
    return workingDirectory;
  }
  private static OS getPlatform() {
    String osName = System.getProperty("os.name").toLowerCase();
    if (osName.contains("win")) return OS.windows;
    if (osName.contains("mac")) return OS.macos;
    if (osName.contains("solaris")) return OS.solaris;
    if (osName.contains("sunos")) return OS.solaris;
    if (osName.contains("linux")) return OS.linux;
    if (osName.contains("unix")) return OS.linux;
    return OS.unknown;
  }
  public static String excutePost(String targetURL, String urlParameters)
  {
    HttpsURLConnection connection = null;
    try
    {
      URL url = new URL(targetURL);
      connection = (HttpsURLConnection)url.openConnection();
      connection.setRequestMethod("POST");
      connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
      connection.setRequestProperty("Content-Length", Integer.toString(urlParameters.getBytes().length));
      connection.setRequestProperty("Content-Language", "en-US");
      connection.setUseCaches(false);
      connection.setDoInput(true);
      connection.setDoOutput(true);
      connection.connect();
      Certificate[] certs = connection.getServerCertificates();
      byte[] bytes = new byte[294];
      DataInputStream dis = new DataInputStream(Util.class.getResourceAsStream("minecraft.key"));
      dis.readFully(bytes);
      dis.close();
      Certificate c = certs[0];
      PublicKey pk = c.getPublicKey();
      byte[] data = pk.getEncoded();
      for (int i = 0; i < data.length; i++) {
        if (data[i] == bytes[i]) continue; throw new RuntimeException("Public key mismatch");
      }
      DataOutputStream wr = new DataOutputStream(connection.getOutputStream());
      wr.writeBytes(urlParameters);
      wr.flush();
      wr.close();
      InputStream is = connection.getInputStream();
      BufferedReader rd = new BufferedReader(new InputStreamReader(is));
      StringBuffer response = new StringBuffer();
      String line;
      while ((line = rd.readLine()) != null)
      {
        String line;
        response.append(line);
        response.append('r');
      }
      rd.close();
      String str1 = response.toString();
      return str1;
    }
    catch (Exception e)
    {
      e.printStackTrace();
      return null;
    }
    finally
    {
      if (connection != null)
        connection.disconnect();
    }
    throw localObject;
  }
  public static boolean isEmpty(String str) {
    return (str == null) || (str.length() == 0);
  }
  public static void openLink(URI uri) {
    try {
      Object o = Class.forName("java.awt.Desktop").getMethod("getDesktop", new Class[0]).invoke(null, new Object[0]);
      o.getClass().getMethod("browse", new Class[] { URI.class }).invoke(o, new Object[] { uri });
    } catch (Throwable e) {
      System.out.println("Failed to open link " + uri.toString());
    }
  }
  private static enum OS
  {
    linux, solaris, windows, macos, unknown;
  }
}

我已经做了一些关于获得当前工作目录的研究，但我不确定需要修改什么。如果有人能解释一下文件中各个部分的含义，那就太有帮助了。

Answer 1

public static File getWorkingDirectory(String applicationName) {
    File workingDirectory = new File("." + File.separator + applicationName);
    if ((!workingDirectory.exists()) && (!workingDirectory.mkdirs())) 
        throw new RuntimeException("The working directory could not be created: " + workingDirectory);
    return workingDirectory;
}

很抱歉造成混乱，这应该可以正常工作。它将在启动器所在的目录下创建一个minecraft文件夹。

注意:在OS X上，这仍然会在文件夹中创建一个名为。app的文件夹，而不是实际JAR所在的。app/Contents/Resources/Java文件夹，所以在任何操作系统上都不会有任何问题。

希望这对你有帮助!

Answer 2

我还是不太明白你的目标。

如果你想让它为你下载"Minecraft"，我会试着在批处理文件和shell脚本中完成它，并且只运行适合你系统的那个。

如果你想从某个地方"下载"你的世界，纹理包和mod，那么你也可以这样做。

如果你想要的是每一个minecraft安装你正在玩上使用你的数据(如USB棒或其他东西)，你可能有批处理文件，要么在运行minecraft之前复制数据，要么使用"ln"来取代minecraft认为它将使用你自己的USB棒上的目录。

Answer 3

您始终可以修改指向MC存放其保存的目录的字段，并将其更改为您想要的任何内容。下面是我的启动器的一个片段(http://www.github.com/lekro/ModdishLauncher):

)

ClassLoader cl = new URLClassLoader(urls, ModdishLauncher.class.getClassLoader());
Class<?> mc = null;
try {
    mc = cl.loadClass("net.minecraft.client.Minecraft");
} catch (ClassNotFoundException e2) {
    System.err.println("Couldn't find Minecraft main class!");
    e2.printStackTrace();
}
Field[] fields = mc.getDeclaredFields();
Field mcPathField = null;
for (int i = 0; i < fields.length; i++) {
    Field f = fields[i];
    if (f.getType() != File.class) {
    continue;
    }
    if (f.getModifiers() != (Modifier.PRIVATE + Modifier.STATIC)) {
    continue;
    }
    mcPathField = f;
    break;
}
mcPathField.setAccessible(true);
try {
    mcPathField.set(null, new File(myDir + "/minecrafts/"+minecraftType+"/"));
} catch (IllegalArgumentException e2) {
    e2.printStackTrace();
} catch (IllegalAccessException e2) {
    e2.printStackTrace();
}

这将在Minecraft类中采用硬编码的路径字段，并将其修改为您想要的任何内容。(例如在u盘，自定义文件夹等)