springLdap 操作ldap示例（增删改查）

在看这个文章之前，最好是了解了openldap的schema文件，也就是了解objectClass和attribute以及它们的关系。否则很容易不了解代码的含义以及抛出的异常。

实体类：

package ldap.entity;

/**
 * 本测试类person对象来自schema文件的core.schema文件
 * objectClass为person，必填属性和可选属性也是根据该对象得到的。
 * Author:Ding Chengyun
 */
public class Person {

    private String sn; //必填属性
    private String cn; //必填属性

    private String userPassword; //可选属性
    private String telephoneNumber; //可选属性
    private String seeAlso; //可选属性
    private String description;  //可选属性
    public String getSn() {
        return sn;
    }
    public void setSn(String sn) {
        this.sn = sn;
    }
    public String getCn() {
        return cn;
    }
    public void setCn(String cn) {
        this.cn = cn;
    }
    public String getUserPassword() {
        return userPassword;
    }
    public void setUserPassword(String userPassword) {
        this.userPassword = userPassword;
    }
    public String getTelephoneNumber() {
        return telephoneNumber;
    }
    public void setTelephoneNumber(String telephoneNumber) {
        this.telephoneNumber = telephoneNumber;
    }
    public String getSeeAlso() {
        return seeAlso;
    }
    public void setSeeAlso(String seeAlso) {
        this.seeAlso = seeAlso;
    }
    public String getDescription() {
        return description;
    }
    public void setDescription(String description) {
        this.description = description;
    }

}

mapper类：

package ldap.mapper;

import javax.naming.NamingException;
import javax.naming.directory.Attributes;

import ldap.entity.Person;

import org.springframework.ldap.core.AttributesMapper;

/**
 * 这个类的作用是将ldap中的属性转化为实体类的属性值，
 * 在查询信息的时候会用到
 */
public class PersonAttributeMapper implements AttributesMapper{

    @Override
    public Object mapFromAttributes(Attributes attr) throws NamingException {
        Person person = new Person();
        person.setSn((String)attr.get("sn").get());
        person.setCn((String)attr.get("cn").get());

        if (attr.get("userPassword") != null) {
            person.setUserPassword((String)attr.get("userPassword").get());
        }
        if (attr.get("telephoneNumber") != null) {
            person.setTelephoneNumber((String)attr.get("telephoneNumber").get());
        }
        if (attr.get("seeAlso") != null) {
            person.setSeeAlso((String)attr.get("seeAlso").get());
        }
        if (attr.get("description") != null) {
            person.setDescription((String)attr.get("description").get());
        }
        return person;
    }

}

dao类：

package ldap.dao;

import java.util.ArrayList;
import java.util.List;

import javax.naming.directory.Attributes;
import javax.naming.directory.BasicAttribute;
import javax.naming.directory.BasicAttributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.ModificationItem;

import ldap.entity.Person;
import ldap.mapper.PersonAttributeMapper;

import org.springframework.ldap.NameNotFoundException;
import org.springframework.ldap.core.DistinguishedName;
import org.springframework.ldap.core.LdapTemplate;
import org.springframework.ldap.filter.AndFilter;
import org.springframework.ldap.filter.EqualsFilter;

import xhrd.ucenter.ldap.entity.UcenterLdapApplication;
import xhrd.ucenter.ldap.ldapAttributeMappper.ApplicationAttributeMapper;

/**
 * Description: 此类的作用是使用spring的 LdapTemplate完成对ldap的增删改查的操作
 * Author:Ding Chengyun
 */
public class PersonDao {

    //注入spring的LdapTemplate，此处在spring的配置文件中需要配置
    private LdapTemplate ldapTemplate;

    public LdapTemplate getLdapTemplate() {
        return ldapTemplate;
    }
    public void setLdapTemplate(LdapTemplate ldapTemplate) {
        this.ldapTemplate = ldapTemplate;
    }

    /**
     * 添加 一条记录
     * @param person
     */
    public void createOnePerson(Person person) {
        BasicAttribute ba = new BasicAttribute("objectclass");
        ba.add("person"); //此处的person对应的是core.schema文件中的objectClass：person
        Attributes attr = new BasicAttributes();
        attr.put(ba);
        //必填属性，不能为null也不能为空字符串
        attr.put("cn", person.getCn());
        attr.put("sn", person.getSn());

        //可选字段需要判断是否为空，如果为空则不能添加
        if (person.getDescription() != null
                && person.getDescription().length() > 0) {
            attr.put("description", person.getDescription());
        }

        if (person.getUserPassword() != null
                && person.getUserPassword().length() > 0) {
            attr.put("userPassword", person.getUserPassword());
        }
        if (person.getSeeAlso() != null
                && person.getSeeAlso().length() > 0) {
            attr.put("seeAlso", person.getSeeAlso());
        }
        if (person.getTelephoneNumber() != null
                && person.getTelephoneNumber().length() > 0) {
            attr.put("telephoneNumber", person.getTelephoneNumber());
        }

        //bind方法即是添加一条记录。
        ldapTemplate.bind(getDn(person.getCn()), null, attr);
    }

    /**

    /**
     * 根据dn查询详细信息
     * @param cn
     * @return
     */
    public UcenterLdapApplication getPersonDetail(String cn) {
        try {
            //ldapTeplate的lookup方法是根据dn进行查询，此查询的效率超高
            UcenterLdapApplication ua = (UcenterLdapApplication)
                ldapTemplate.lookup(getDn(cn),
                        new ApplicationAttributeMapper());
            return ua;
        } catch (NameNotFoundException e) {
            return null;
        }
    }

    /**
     * 根据自定义的属性值查询person列表
     * @param person
     * @return
     */
    public List<Person> getPersonList(
            Person person) {
        List<Person> list = new ArrayList<Person>();
        //查询过滤条件
        AndFilter andFilter = new AndFilter();
        andFilter.and(new EqualsFilter("objectclass", "person"));


        if (person.getCn() != null
                && person.getCn().length() > 0) {
            andFilter.and(new EqualsFilter("cn", person.getCn()));
        }
        if (person.getSn() != null
                && person.getSn().length() > 0) {
            andFilter.and(new EqualsFilter("sn", person.getSn()));
        }

        if (person.getDescription() != null
                && person.getDescription().length() > 0) {
            andFilter.and(new EqualsFilter("description", person.getDescription()));
        }

        if (person.getUserPassword() != null
                && person.getUserPassword().length() > 0) {
            andFilter.and(new EqualsFilter("userPassword", person.getUserPassword()));
        }
        if (person.getSeeAlso() != null
                && person.getSeeAlso().length() > 0) {
            andFilter.and(new EqualsFilter("seeAlso", person.getSeeAlso()));
        }
        if (person.getTelephoneNumber() != null
                && person.getTelephoneNumber().length() > 0) {
            andFilter.and(new EqualsFilter("telephoneNumber", person.getTelephoneNumber()));
        }
        //search是根据过滤条件进行查询，第一个参数是父节点的dn，可以为空，不为空时查询效率更高
        list = ldapTemplate.search("", andFilter.encode(),
                new PersonAttributeMapper());
        return list;
    }

    /**
     * 删除一条记录，根据dn
     * @param cn
     */
    public void removeOnePerson(String cn) {
        ldapTemplate.unbind(getDn(cn));
    }

    /**
     * 修改操作
     * @param person
     */
    public void updateOnePerson(Person person) {
        if (person == null || person.getCn() == null
                || person.getCn().length() <= 0) {
            return;
        }
        List<ModificationItem> mList = new ArrayList<ModificationItem>();

        mList.add(new ModificationItem(DirContext.REPLACE_ATTRIBUTE,
                new BasicAttribute("sn",person.getSn())));
        mList.add(new ModificationItem(DirContext.REPLACE_ATTRIBUTE,
                new BasicAttribute("description",person.getDescription())));
        mList.add(new ModificationItem(DirContext.REPLACE_ATTRIBUTE,
                new BasicAttribute("seeAlso",person.getSeeAlso())));
        mList.add(new ModificationItem(DirContext.REPLACE_ATTRIBUTE,
                new BasicAttribute("telephoneNumber",person.getTelephoneNumber())));
        mList.add(new ModificationItem(DirContext.REPLACE_ATTRIBUTE,
                new BasicAttribute("userPassword",person.getUserPassword())));

        if (mList.size() > 0) {
            ModificationItem[] mArray = new ModificationItem[mList.size()];
            for (int i = 0; i < mList.size(); i++) {
                mArray[i] = mList.get(i);
            }
            //modifyAttributes 方法是修改对象的操作，与rebind（）方法需要区别开
            ldapTemplate.modifyAttributes(this.getDn(person.getCn()), mArray);
        }
    }
    /**
     * 得到dn
     * @param cn
     * @return
     */
    private DistinguishedName getDn(String cn) {
        //得到根目录，也就是配置文件中配置的ldap的根目录
        DistinguishedName newContactDN = new DistinguishedName();
        // 添加cn，即使得该条记录的dn为"cn=cn,根目录",例如"cn=abc,dc=testdc,dc=com"
        newContactDN.add("cn", cn);
        return newContactDN;
    }
}