使用JNDI操做LDAP（2）（轉載）

好了，如今介紹一些簡單的操做。

 

l         修改屬性

修改屬性包括增長，修改，刪除屬性。

修改一個對象的屬性的方法之一就是提供一個修改請求列表(ModificationItem)。每一個ModificationItem由必定數量的指定修改類型的常量（ADD_ATTRIBUTE,REPLACE_ATTRIBUTE,REMOVE_ATTRIBUTE）以及修改的屬性Attribute組成。

 

下面是我寫的簡單的操做代碼：

    /**

     * updates the specified extension information,including add,replace,remove attribute

     * @param search_base The search distinguishedName.

     * @param mod_op The modificational operation,can use ADD_ATTRIBUTE,REPLACE_ATTRIBUTE,REMOVE_ATTRIBUTE.

     * @param ctx The ldapcontext.

     */

    public static void updateAttribute(String search_base,int mod_op,LdapContext ctx){

        try {

            Attributes attrs = null;

            Attribute attr = null;           

            //define ModificationItem

            ModificationItem[] mods =new ModificationItem[1];

           

            //operate the ModificationItem

            switch(mod_op){

                //operation add_attribute

                case LdapContext.ADD_ATTRIBUTE:{

                    //instance an attribute to be added

                    attr = new BasicAttribute("description");

                    //value of attribute description to add

                    attr.add("I add an attribute.");

                    //instance ModificationItem

                    mods[0] = new ModificationItem(LdapContext.ADD_ATTRIBUTE,attr);

                    //add description attribute

                  ctx.modifyAttributes(search_base,mods);

                    attrs = ctx.getAttributes(search_base,new String[]{"description"});

                    //print the value of new attribute

                    System.out.println("****new attribute****");

                    System.out.println("attribute: description ");

                    System.out.println("value:"+attrs.get("description"));                   

                    break;

                }

               

                //operation replace_attribute

                case LdapContext.REPLACE_ATTRIBUTE:{

                    //print the value of original attribute

                    attrs = ctx.getAttributes(search_base,new String[]{"description"});                   

                    System.out.println("****original attribute****");

                    System.out.println("attribute:description");

                    System.out.println("value:"+attrs.get("description"));

                    //instance an attribute to be replaced

                    attr = new BasicAttribute("description");

                    //add value of attribute description to replace

                    attr.add("I replace an attribute.");

                    //instance ModificationItem

                   mods[0] = new ModificationItem(LdapContext.REPLACE_ATTRIBUTE,attr);

                    //replace description attribute                   

                    ctx.modifyAttributes(search_base,mods);

                    attrs = ctx.getAttributes(search_base,new String[]{"description"});

                    //print the value of replaced attribute

                    System.out.println("****replaced attribute****");

                    System.out.println("attribute:description");

                    System.out.println("value:"+attrs.get("description"));

                    break;

                }

               

                //operation remove_attribute

                case LdapContext.REMOVE_ATTRIBUTE:{

                    //print the value of original attribute

                    attrs = ctx.getAttributes(search_base,new String[]{"description"});                   

                    System.out.println("****original attribute****");

                    System.out.println("attribute:description");

                    System.out.println("value:"+attrs.get("description"));

                    //instance an attribute to be removed

                    attr = new BasicAttribute("description");

                    //instance ModificationItem

                    mods[0] = new ModificationItem(LdapContext.REMOVE_ATTRIBUTE,attr);

                    //remove description attribute                   

                    ctx.modifyAttributes(search_base,mods);

                    attrs = ctx.getAttributes(search_base,new String[]{"description"});

                    //print the value of removed attribute

                    System.out.println("****removed attribute****");

                    System.out.println("attribute:description");

                    System.out.println("value:"+attrs.get("description"));

                    break;

                }

            }           

        } catch (Exception e){

            System.out.println(e.toString());

        }       

    }

 

這個例子裏面有註釋，並且很好懂，我就不一一詳解了。

要注意的是，ModificationItem[]數組能夠指定一系列的操做，修改的順序和它們出如今數組中的順序一致，要麼全部的修改都完成，要麼一個都不完成，即一個遨豪一直專一於Liferay門戶本地化服務,致力於爲中國用戶提供最佳的Liferay門戶解決方案，其主要服務包括：

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-------------------------------------修改操做是一個事務。