蜜x蜜水果糖 漫画类似:使用JNDI操作LDAP(3)

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l         读取属性

当读取目录中一个对象的属性时,需要将对象名传给LdapContext.getAttributes()方法作参数。假设有一个名为”cn=Ted Geisel,ou=people”的对象,为了获取它的属性,需要使用如下的代码:

Attributes answer = ctx.getAttributes("cn=Ted Geisel, ou=People");

通过下面的代码迭代打出所有的属性名和属性值:

for (NamingEnumeration ae = attrs.getAll(); ae.hasMore();) {

         Attribute attr = (Attribute) ae.next();

         System.out.println("attribute: " + attr.getID());

         /* print each value */

for (NamingEnumeration e = attr.getAll(); e.hasMore(); System.out

                                                                                                                         .println("value: " + e.next()));

}

执行的结果如下:

attribute: telephonenumber

value: +1 408 555 5252

attribute: mail

value: Ted.Geisel@JNDITutorial.com

attribute: facsimiletelephonenumber

value: +1 408 555 2329

返回指定的属性:

为了运行所有属性的一个子集,可以指定一个属性名数组来指定需要获取的属性:

// Specify the ids of the attributes to return

                   String[] attrIDs = { "sn", "telephonenumber", "golfhandicap",

                                                                                             "mail" };

                   // Get the attributes requested

                   Attributes answer = ctx.getAttributes("cn=Ted Geisel, ou=People",

                                                                                    attrIDs);

返回结果如下:

attribute: telephonenumber

value: +1 408 555 5252

attribute: mail

value: Ted.Geisel@JNDITutorial.com

attribute: sn

value: Geisel

由于这个对象没有golfhanicap属性,所以只返回三个属性。

基本检索

这是目录检索的最简单的形式,只需要指定检索结果必须包含的属性以及检索的目的上下文。下面的代码创建了一个属性集matchAttrs,其中包含两个属性,telephonenumber和mail,检索指定了实体必须具有的surname(sn)属性和mail属性,并且surname属性的值为”Geisel”,而mail的属性值任意。然后调用DirContext.search()方法在ou=people的上下文中检索符合matchAttrs的实体。

Attributes matchAttrs = new BasicAttributes(true); // ignore case

matchAttrs.put(new BasicAttribute("sn", "Geisel"));

matchAttrs.put(new BasicAttribute("mail"));

// Search for objects that have those matching attributes

NamingEnumeration answer = ctx.search("ou=People", matchAttrs);

可以使用下面的语句打印结果:

while (answer.hasMore()) {

SearchResult sr = (SearchResult) answer.next();

System.out.println(">>>" + sr.getName());

GetattrsAll.printAttrs(sr.getAttributes());

}

返回结果为:

>>>cn=Ted Geisel

attribute: telephonenumber

value: +1 408 555 5252

attribute: mail

value: Ted.Geisel@JNDITutorial.com

attribute: facsimiletelephonenumber

value: +1 408 555 2329

attribute: objectClass

value: person

value: inetOrgPerson

value: organizationalPerson

value: top

attribute: jpegphoto

value: [B@179c285

attribute: sn

value: Geisel

attribute: cn

value: Ted Geisel

可以选择返回指定的属性,代码如下:

// Specify the ids of the attributes to return

String[] attrIDs = { "sn", "telephonenumber", "golfhandicap","mail" };

answer = ctx.search("ou=People", matchAttrs, attrIDs);

此时返回的结果为:

>>>cn=Ted Geisel

attribute: telephonenumber

value: +1 408 555 5252

attribute: mail

value: Ted.Geisel@JNDITutorial.com

attribute: sn

value: Geisel