LDAP操作之java篇（1）
本文将分成4部分对LDAP操作进行讲解，每一部分都附带小例子(主要是参考MANNING - LDAP Programming, Management and Intergration一书，自己做了一些修改并通过验证)。阅读本文要有一定的LDAP知识，其实如果你自己配过LDAP服务器以后再来看这篇文章应该没什么难度(参见上一篇文章《在windows上配置openldap》)
连接LDAP服务器
String dn; //包括连接LDAP服务器的用户及要操作的根节点
DirContext dc; //相当于这个树的一个映像
Properties env = new Properties();
env.put(DirContext.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.ldap.LdapCtxFactory");
env.put(DirContext.PROVIDER_URL, "ldap://" + host + ":" + port);
if (dn != null) {
env.put(DirContext.SECURITY_PRINCIPAL, dn);
env.put(DirContext.SECURITY_CREDENTIALS, password);
}
dc = new InitialDirContext(env);
dn举例: dn=” cn=Manager,dc=kkk,dc=com”,password就是这个dn对应的密码。Host是LDAP服务器的主机地址，port是端口(openLDAP默认开放的是389)
查询这棵树的所有节点
有点类似sql里边的select * from tableName;
/**
* @param base ：根节点(在这里是”dc=kkk,dc=com”)
* @param scope ：搜索范围
* @param filter ：指定子节点(格式为”(objectclass=*)”,*是指全部，你也可以指定某一特定类型的树节点)
* @param attributes ：属性集合(格式为{“*”}如果要指定搜索某一指定的属性列，就把*改成响应的属性列名称就行了)
* @return result ：result里边存的就是查询的结果集合
*/
public Vector searchInformation(String base, String scope, String filter,
String[] attributes)
{
Vector results = new Vector();
SearchControls sc = new SearchControls();
if (scope.equals("base")) {
sc.setSearchScope(SearchControls.OBJECT_SCOPE);
} else if (scope.equals("one")) {
sc.setSearchScope(SearchControls.ONELEVEL_SCOPE);
} else {
sc.setSearchScope(SearchControls.SUBTREE_SCOPE);
}
// Reduce data provided by the LDAP server by listing
// only those attributes we want to return.
if (attributes.length > 0) {
sc.setReturningAttributes(attributes);
}
NamingEnumeration ne = null;
try {
ne = dc.search(base, filter, sc);
// Use the NamingEnumeration object to cycle through
// the result set.
while (ne.hasMore()) {
Entry entry = new Entry();
SearchResult sr = (SearchResult) ne.next();
String name = sr.getName();
if (base != null && !base.equals("")) {
entry.setDN(name + "," + base);
} else {
entry.setDN(name);
}
Attributes at = sr.getAttributes();
NamingEnumeration ane = at.getAll();
while (ane.hasMore()) {
Attribute attr = (Attribute) ane.next();
String attrType = attr.getID();
NamingEnumeration values = attr.getAll();
Vector vals = new Vector();
// Another NamingEnumeration object, this time
// to iterate through attribute values.
while (values.hasMore()) {
Object oneVal = values.nextElement();
if (oneVal instanceof String) {
vals.addElement((String) oneVal);
} else {
vals.addElement(new String((byte[]) oneVal));
}
}
entry.put(attrType, vals);
}
results.addElement(entry);
}
// The search() method can throw a number of exceptions.
// Here we just handle and print the exception.
// In real life we might want to pass the exception along
// to a piece of the software that might have a better
// context for correcting or presenting the problem.
} catch (Exception nex) {
System.err.println("Error: " + nex.getMessage());
nex.printStackTrace();
lc.close();
}
return results;
}
由于时间的关系，今天就先写到这，改天再把增加、修改、删除节点加上来：） 。