在Java程序中計算zip文件的md5哈希值

Question

我有一個zip文件，在我的Java代碼中，我想計算zip文件的md5哈希值。有沒有可用於此目的的Java庫？一些例子將非常感激。

謝謝

Answer 1

我得到了工作在幾個星期前本條這裏：

http://www.javalobby.org/java/forums/t84420.html

正好有它stackoveflow：

public static void main(String[] args) throws NoSuchAlgorithmException, FileNotFoundException { 
MessageDigest digest = MessageDigest.getInstance("MD5"); 
File f = new File("c:\\myfile.txt"); 
InputStream is = new FileInputStream(f);     
byte[] buffer = new byte[8192]; 
int read = 0; 
try { 
    while((read = is.read(buffer)) > 0) { 
     digest.update(buffer, 0, read); 
    }  
    byte[] md5sum = digest.digest(); 
    BigInteger bigInt = new BigInteger(1, md5sum); 
    String output = bigInt.toString(16); 
    System.out.println("MD5: " + output); 
} 
catch(IOException e) { 
    throw new RuntimeException("Unable to process file for MD5", e); 
} 
finally { 
    try { 
     is.close(); 
    } 
    catch(IOException e) { 
     throw new RuntimeException("Unable to close input stream for MD5 calculation", e); 
    } 
}  
}