james用編碼實現使用者的新增

要想實現郵箱使用者的新增，可以通過命令列的方式新增adduser    username    password
下面要講的是通過資料庫表的操作來新增。
可以先回顧下之前講過的james用資料庫mail來儲存的使用者表的配置
https://blog.csdn.net/xiao__jia__jia/article/details/83619545

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package com.hstc.bean;

import javax.mail.MessagingException;
import javax.mail.internet.MimeUtility;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Locale;


/**
 * Computes and verifies digests of files and strings
 *
 *
 * @version $Revision: 494012 $
 * james原始碼的郵箱密碼加密類
 */
public class DigestUtil {

    /**
     * Command line interface. Use -help for arguments.
     *
     * @param args the arguments passed in on the command line
     */
    public static void main(String[] args) {

        String alg = "SHA";
        boolean file = false;
    
        if (args.length == 0 || args.length > 4) {
            printUsage();
            return;
        }
    
        for (int i = 0; i < args.length; i++) {
            String currArg = args[i].toLowerCase(Locale.US);
            if (currArg.equals("-help")
                || currArg.equals("-usage")) {
                printUsage();
                return;
            }
            if (currArg.equals("-alg")) {
                alg = args[i+1];
            }
            if (currArg.equals("-file")) {
                file = true;
            }
        }
    
        if (file) {
            digestFile(args[args.length - 1], alg);
            return ;
        } else {
            try {
                String hash = digestString(args[args.length - 1], alg);
                System.out.println("Hash is: " + hash);
                return;
            } catch (NoSuchAlgorithmException nsae) {
                System.out.println("No such algorithm available");
            }
        }
    }

    /**
     * Print the command line usage string.
     */
    public static void printUsage() {
        System.out.println("Usage: " 
                           + "java org.apache.james.security.DigestUtil"
                           + " [-alg algorithm]"
                           + " [-file] filename|string");
    }

    /**
     * Calculate digest of given file with given algorithm.
     * Writes digest to file named filename.algorithm .
     *
     * @param filename the String name of the file to be hashed
     * @param algorithm the algorithm to be used to compute the digest
     */
    public static void digestFile(String filename, String algorithm) {
        byte[] b = new byte[65536];
        int count = 0;
        int read = 0;
        FileInputStream fis = null;
        FileOutputStream fos = null;
        try {
            MessageDigest md = MessageDigest.getInstance(algorithm);
            fis = new FileInputStream(filename);
            while (fis.available() > 0) {
                read =  fis.read(b);
                md.update(b, 0, read);
                count += read;
            }
            byte[] digest = md.digest();
            StringBuffer fileNameBuffer =
                new StringBuffer(128)
                        .append(filename)
                        .append(".")
                        .append(algorithm);
            fos = new FileOutputStream(fileNameBuffer.toString());
            OutputStream encodedStream = MimeUtility.encode(fos, "base64");
            encodedStream.write(digest);
            fos.flush();
        } catch (Exception e) {
            System.out.println("Error computing Digest: " + e);
        } finally {
            try {
                fis.close();
                fos.close();
            } catch (Exception ignored) {}
        }
    }

    /**
     * Calculate digest of given String using given algorithm.
     * Encode digest in MIME-like base64.
     *
     * @param pass the String to be hashed
     * @param algorithm the algorithm to be used
     * @return String Base-64 encoding of digest
     *
     * @throws NoSuchAlgorithmException if the algorithm passed in cannot be found
     */
    public static String digestString(String pass, String algorithm )
            throws NoSuchAlgorithmException  {

        MessageDigest md;
        ByteArrayOutputStream bos;

        try {
            md = MessageDigest.getInstance(algorithm);
            byte[] digest = md.digest(pass.getBytes("iso-8859-1"));
            bos = new ByteArrayOutputStream();
            OutputStream encodedStream = MimeUtility.encode(bos, "base64");
            encodedStream.write(digest);
            return bos.toString("iso-8859-1");
        } catch (IOException ioe) {
            throw new RuntimeException("Fatal error: " + ioe);
        } catch (MessagingException me) {
            throw new RuntimeException("Fatal error: " + me);
        }
    }

    /**
     * Private constructor to prevent instantiation of the class
     */
    private DigestUtil() {}
}
 

最後只要把我想要新增的使用者的密碼進行加密，並且插入資料庫的user表中就算成功新增一個使用者賬號了
 

 String password = DigestUtil.digestString("xiancai", "SHA");

以上就完成了使用者的新增，挺簡單的
所以類似使用者的刪除，也可以操作資料庫的user表了，不過還得考慮一點，刪除使用者賬號時，需要先刪除使用者賬號下的所有的郵件，然後再操作資料庫，這樣就避免垃圾資料堆積在james伺服器中了（想法很天真，水平有限，不知道對錯，勿懟）。