如何在Java中創建一個不包含絕對路徑名的Zip/Jar

Question

我在Java中生成一個.jar文件，但是.jar包含它在系統中的絕對路徑名（/ tmp/tempXXX/foo而不是/ foo）。 樹是這樣的：

. 
|-- META-INF 
|-|- .... 
|-- tmp 
|-|- tempXXX 
|-|-|- foo 
|-|-|- bar 

取而代之的是：

. 
|-- META-INF 
|-|- .... 
|-- foo 
|-- bar 

是否有可能解決這一問題？這是它的功能：

public static void add(File source, JarOutputStream target, String removeme) 
     throws IOException 
{ 
    BufferedInputStream in = null; 
    try 
    { 
     File source2 = source; 
     if (source.isDirectory()) 
     { 
      String name = source2.getPath().replace("\\", "/"); 
      if (!name.isEmpty()) 
      { 
       if (!name.endsWith("/")) 
        name += "/"; 
       JarEntry entry = new JarEntry(name); 
       entry.setTime(source.lastModified()); 
       target.putNextEntry(entry); 
       target.closeEntry(); 
      } 
      for (File nestedFile : source.listFiles()) 
       add(nestedFile, target, removeme); 
      return; 
     } 

     JarEntry entry = new JarEntry(source2.getPath().replace("\\", "/")); 
     entry.setTime(source.lastModified()); 
     target.putNextEntry(entry); 
     in = new BufferedInputStream(new FileInputStream(source)); 

     byte[] buffer = new byte[2048]; 
     while (true) 
     { 
      int count = in.read(buffer); 
      if (count == -1) 
       break; 
      target.write(buffer, 0, count); 
     } 
     target.closeEntry(); 
    } 
    finally 
    { 
     if (in != null) 
      in.close(); 
    } 
} 

source2變量是修改路徑，但修改時，它給了一個「無效的.jar文件」錯誤。 修改是這樣的：

File source2 = new File(source.getPath().replaceAll("^" + removeme, "")); 

編輯：它現在有效。這裏是新代碼，如果有人感興趣：

public static void add(File source, JarOutputStream target, String removeme) 
     throws IOException 
{ 
    BufferedInputStream in = null; 
    try 
    { 
     File parentDir = new File(removeme); 
     File source2 = new File(source.getCanonicalPath().substring(
       parentDir.getCanonicalPath().length() + 1, 
       source.getCanonicalPath().length())); 
     if (source.isDirectory()) 
     { 
      String name = source2.getPath().replace("\\", "/"); 
      if (!name.isEmpty()) 
      { 
       if (!name.endsWith("/")) 
        name += "/"; 
       JarEntry entry = new JarEntry(name); 
       entry.setTime(source.lastModified()); 
       target.putNextEntry(entry); 
       target.closeEntry(); 
      } 
      for (File nestedFile : source.listFiles()) 
       add(nestedFile, target, removeme); 
      return; 
     } 

     JarEntry entry = new JarEntry(source2.getPath().replace("\\", "/")); 
     entry.setTime(source.lastModified()); 
     target.putNextEntry(entry); 
     in = new BufferedInputStream(new FileInputStream(source)); 

     byte[] buffer = new byte[2048]; 
     while (true) 
     { 
      int count = in.read(buffer); 
      if (count == -1) 
       break; 
      target.write(buffer, 0, count); 
     } 
     target.closeEntry(); 
    } 
    finally 
    { 
     if (in != null) 
      in.close(); 
    } 
} 

Answer 1

要獲得相對路徑，你必須提供一個相對路徑，當調用JarEntry（名稱）。嘗試刪除到父目錄的部分路徑。所以那會是這樣的，

File parentDir = "src";//dir from which you want the relative path 

String relPath = source.getCanonicalPath() 
        .substring(parentDir.getCanonicalPath().length() + 1, 
          source.getCanonicalPath().length()); 

JarEntry entry = new JarEntry(relPath.replace(("\\", "/")); 
...