Java-從jar中刪除META-INF不起作用

Question

我目前正在開發一個將mods安裝到Minecraft的應用程序，並且版本3.1DEV即將完成，唯一阻止我的是我的代碼不會刪除META-INF，這是我的代碼

        ZipInputStream modZip = new ZipInputStream(new FileInputStream(mod.getDir()));
        ZipInputStream minecraftZip = new ZipInputStream(new FileInputStream(new File(mcDir + "\\bin\\", "minecraft.jar")));
        ZipOutputStream tmpZip = new ZipOutputStream(new FileOutputStream(new File("temp\\tmp.jar")));
        byte[] buffer = new byte[1024];

        for(ZipEntry ze = modZip.getNextEntry(); ze != null; ze = modZip.getNextEntry())
        {
            tmpZip.putNextEntry(ze);
            for(int read = modZip.read(buffer); read != -1; read = modZip.read(buffer))
            {
                tmpZip.write(buffer, 0, read);
            }
            tmpZip.closeEntry();
        }
        modZip.close();


        for(ZipEntry ze = minecraftZip.getNextEntry(); ze != null; ze = minecraftZip.getNextEntry())
        {
            try
            {
                boolean isMetaInf = false;

                if(ze.getName().contains("META-INF"))
                {
                    isMetaInf = true;
                }

                if(!isMetaInf)
                {
                    tmpZip.putNextEntry(ze);
                    for(int read = minecraftZip.read(buffer); read != -1; read = minecraftZip.read(buffer))
                    {
                        tmpZip.write(buffer, 0, read);
                    }
                    tmpZip.closeEntry();
                }
            }
            catch(Exception e)
            {
                continue;
            }
        }
        minecraftZip.close();

        tmpZip.flush();
        tmpZip.close();

        File tmp = new File("temp//tmp.jar");
        tmp.renameTo(new File("temp//minecraft.jar"));
        File minecraft = new File(mcDir + "\\bin\\minecraft.jar");
        minecraft.delete();
        FileUtils.copyFile(new File("temp\\minecraft.jar"), minecraft);
        tmp.delete();

歡迎任何鏈接或示例

• Hachi Software首席執行官利亞姆（Liam）

Answer 1

問題出在邏輯上，讓我們來看一下：

1. 第一次找到META-INF文件夾時，將標志設置為true。 循環中什么都不會發生，所以我們繼續
2. 在下一個循環迭代中，將標志重置為false並進入!isMetaInf部分

3. zip條目已添加到臨時zip：

   tmpZip.putNextEntry(ze);

4. 您將整個Minecraft zip從頭到尾寫到temp zip中：

    for(int read = minecraftZip.read(buffer); read != -1; read = minecraftZip.read(buffer)) { tmpZip.write(buffer, 0, read); } tmpZip.closeEntry(); 

5. 此時，您無需中斷循環，因此將對jar中的每個文件重復此過程。

如果您只刪除手動的讀寫循環，則可以在最后調用close()時允許ZipOutputStream為您完成所有編寫工作；或者，如果您使用Java 7，則可以使用try- with-resources：

public static void copyWithoutMetaInf(final String originalZip, final String newZip) throws IOException
{
    try (final ZipInputStream zip = new ZipInputStream(new FileInputStream(originalZip));
         final ZipOutputStream zop = new ZipOutputStream(new FileOutputStream(newZip)))
    {
        ZipEntry entry;
        while((entry = zip.getNextEntry()) != null)
        {
            if(!entry.getName().contains("META-INF"))
            {
                zop.putNextEntry(entry);
            }
        }
    }
}

public static void main(String[] args) throws IOException
{
    copyWithoutMetaInf("1.6.4.jar", "copy.jar");
}

對於較舊的版本，是否為：

public static void copyWithoutMetaInf(final String originalZip, final String newZip) throws IOException
{
    final ZipInputStream zip = new ZipInputStream(new FileInputStream(originalZip));
    final ZipOutputStream zop = new ZipOutputStream(new FileOutputStream(newZip));
    ZipEntry entry;
    while((entry = zip.getNextEntry()) != null)
    {
        if(!entry.getName().contains("META-INF"))
        {
            zop.putNextEntry(entry);
        }
    }
    zip.close();
    zop.close();
}