宣告：

1、解決辦法是從一個英文網站找到的，現在找不到了，不是我自己解決的

2、連線ldap的方法，也是從網上拷貝，因為方法是固定和通用的

3、歡迎拍磚和開罵，真的，但是至少罵完後告訴我哪裡不對，教小弟幾招

    前一陣子需要做一個從第三方ldap同步使用者到本地系統的功能，本地後臺服務是java寫的，考慮到資料同步的一致性，使用ldap獲取的資料中的的objectGUID作為兩個系統的唯一標示

    但是問題來了，objectGUID這個東西貌似是octString型別的，本地服務獲取時，居然出現了亂碼。在網上找了好多方法，無外乎都是轉換成String然後getBytes（），然後通過一系列的演算法操作轉換為16進位制碼等等。

    好吧，基本上，是這樣的

......//連線ldap和查詢程式碼省略
 
if("objectGUID".equals(Attr.getID())){  
    String st = getGUID(Attr.get().toString().getBytes()); //objectGUID
     
......//後續處理程式碼省略
 
}//方法結束
 
private static String getGUID(byte[] inArr) {  
 
    StringBuffer guid = new StringBuffer();  
     
        for (int i = 0; i < inArr.length; i++) {  
            StringBuffer dblByte = new StringBuffer(  
                    Integer.toHexString(inArr[i] & 0xff));  
            if (dblByte.length() == 1) {  
                guid.append("0");  
            }  
            guid.append(dblByte);  
        }  
        return guid.toString();  
    }
 

不知道是我沒有搞清楚原理還是什麼原因，上面這種方法,因為先把取出來的值toString了一次，在不同的伺服器（計算機）上，轉換出來的十六進位制碼是不同的，具體原因待查。這樣對將來的備份和資料遷移肯定是災難！！！

    下面這種方法就好多了，而且還原了ldap伺服器上的呈現形式，比如：

objectGUID：{751837D8-A40F-4F78-AE6C-29E2AD8D9921}

    public static void main(String[] args) {
 
        String adminName = "[email protected]";             // 賬號
        String adminPassword = "123456";             // 密碼
        String ldapURL = "ldap://192.168.0.123:389"; // 地址
 
        Properties env = new Properties();
 
        env.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.ldap.LdapCtxFactory");
        env.put(Context.SECURITY_AUTHENTICATION, "simple");// "none","simple","strong"
        env.put(Context.SECURITY_PRINCIPAL, adminName);
        env.put(Context.SECURITY_CREDENTIALS, adminPassword);
        env.put(Context.PROVIDER_URL, ldapURL);
         
        //  **解決 亂碼 的關鍵一句
        env.put("java.naming.ldap.attributes.binary","objectGUID");
 
        try {
             
            //  建立連線
            LdapContext ctx = new InitialLdapContext(env, null);
             
            //  定義要取出的屬性
            String returnedAtts[] = { 
                    "cn", 
                    "sn", 
                    "givenname",
                    "distinguishedName", 
                    "displayname", 
                    "objectCategory",
                    "objectClass", 
                    "objectGUID", 
                    "objectSid",
                    "userAccountControl", 
                    "name", 
                    "distinguishedName" 
            };
            SearchControls searchCtls = new SearchControls();
            searchCtls.setSearchScope(SearchControls.SUBTREE_SCOPE);
            searchCtls.setReturningAttributes(returnedAtts);
 
            //  定義條件
            String searchFilter = "(&(objectClass=person)(objectClass=organizationalPerson)(objectClass=user)(!(objectClass=computer)))";
            String searchBase = "DC=com,DC=cn";
 
            //  執行查詢
            NamingEnumeration<SearchResult> answer = ctx.search(searchBase,searchFilter, searchCtls);
            while (answer.hasMoreElements()) {
 
                SearchResult sr = (SearchResult) answer.next();
//              System.out.println(sr.getAttributes().get("distinguishedName")
//                      .toString()
//                      + " || "
//                      + sr.getAttributes().get("userAccountControl").toString()
//                      + " || "
//                      + sr.getAttributes().get("objectClass").toString()
//                      + " || "
//                      + sr.getAttributes().get("name").toString()
//                      + " || "
//                      + sr.getAttributes().get("objectGUID").toString());
                 
                byte[] GUID = (byte[])sr.getAttributes().get("objectGUID").get();
                 
                String strGUID = "";
                String byteGUID = "";
                 
                 
                //Convert the GUID into string using the byte format
                for (int c=0;c<GUID.length;c++) {
                     byteGUID = byteGUID + "\\" + AddLeadingZero((int)GUID[c] & 0xFF);
                }
                strGUID = "{";
                strGUID = strGUID + AddLeadingZero((int)GUID[3] & 0xFF);
                strGUID = strGUID + AddLeadingZero((int)GUID[2] & 0xFF);
                strGUID = strGUID + AddLeadingZero((int)GUID[1] & 0xFF); 
                strGUID = strGUID + AddLeadingZero((int)GUID[0] & 0xFF);
                strGUID = strGUID + "-";
                strGUID = strGUID + AddLeadingZero((int)GUID[5] & 0xFF);
                strGUID = strGUID + AddLeadingZero((int)GUID[4] & 0xFF);
                strGUID = strGUID + "-";
                strGUID = strGUID + AddLeadingZero((int)GUID[7] & 0xFF);
                strGUID = strGUID + AddLeadingZero((int)GUID[6] & 0xFF);
                strGUID = strGUID + "-";
                strGUID = strGUID + AddLeadingZero((int)GUID[8] & 0xFF);
                strGUID = strGUID + AddLeadingZero((int)GUID[9] & 0xFF);
                strGUID = strGUID + "-";
                strGUID = strGUID + AddLeadingZero((int)GUID[10] & 0xFF);
                strGUID = strGUID + AddLeadingZero((int)GUID[11] & 0xFF);
                strGUID = strGUID + AddLeadingZero((int)GUID[12] & 0xFF);
                strGUID = strGUID + AddLeadingZero((int)GUID[13] & 0xFF);
                strGUID = strGUID + AddLeadingZero((int)GUID[14] & 0xFF);
                strGUID = strGUID + AddLeadingZero((int)GUID[15] & 0xFF);
                strGUID = strGUID + "}";
                System.out.println(sr.getAttributes().get("name"));
                System.out.println("GUID (String format): " + strGUID);
                //System.out.println("GUID (Byte format): " + byteGUID);
 
            }
             
             
            ctx.close();
        } catch (NamingException e) {
            e.printStackTrace();
            System.err.println("Problem searching directory: " + e);
        }
    }
 
    public static String AddLeadingZero(int k) {
        return (k <= 0xF) ? "0" + Integer.toHexString(k) : Integer
                .toHexString(k);
    }