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请看下面的测试类。我正在尝试使用 Spring LDAP 模板进行 LDAP 搜索。我可以使用 DirContext 搜索并生成与搜索条件相对应的条目列表，而无需使用 Spring LDAP 模板，如方法 searchWithoutTemplate() 中所示。但是当我使用 LdapTemplate 时，我最终会得到一个 NPE，如下所示。我确定我一定错过了什么。有人可以帮忙吗？

import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;
import javax.naming.ldap.LdapName;
import org.springframework.ldap.core.AttributesMapper;
import org.springframework.ldap.core.LdapTemplate;
import org.springframework.ldap.core.support.DefaultDirObjectFactory;
import org.springframework.ldap.core.support.LdapContextSource;

public class LDAPSearchTest {
    //bind params
    static String url="ldap://<IP>:<PORT>";
    static String userName="cn=Directory Manager";
    static String password="password123";
    static String bindDN="dc=XXX,dc=com";

    //search params
    static String base = "ou=StandardUser,ou=XXXCustomers,ou=People,dc=XXX,dc=com";
    static String filter = "(objectClass=*)";
    static String[] attributeFilter = { "cn", "uid" };
    static SearchControls sc = new SearchControls();

    public static void main(String[] args) throws Exception {
        // sc.setSearchScope(SearchControls.SUBTREE_SCOPE);
        sc.setReturningAttributes(attributeFilter);
        searchWithTemplate(); //NPE
        //searchWithoutTemplate(); //works fine
    }

    public static void searchWithTemplate() throws Exception {
        DefaultDirObjectFactory factory = new DefaultDirObjectFactory();
        LdapContextSource cs = new LdapContextSource();
        cs.setUrl(url);
        cs.setUserDn(userName);
        cs.setPassword(password);
        cs.setBase(bindDN);
        cs.setDirObjectFactory(factory.getClass ());
        LdapTemplate template = new LdapTemplate(cs);
        template.afterPropertiesSet();
        System.out.println((template.search(new LdapName(base), filter, sc,
                new AttributesMapper() {
                    public Object mapFromAttributes(Attributes attrs)
                            throws NamingException {
                        System.out.println(attrs);
                        return attrs.get("uid").get();
                    }
                })));
    }

    public static void searchWithoutTemplate() throws NamingException{
        Hashtable env = new Hashtable(11);
        env.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.ldap.LdapCtxFactory");
        env.put(Context.PROVIDER_URL, url);
        //env.put(Context.SECURITY_AUTHENTICATION, "simple");
        env.put(Context.SECURITY_PRINCIPAL, userName);
        env.put(Context.SECURITY_CREDENTIALS, password);
        DirContext dctx = new InitialDirContext(env);
        NamingEnumeration results = dctx.search(base, filter, sc);
        while (results.hasMore()) {
            SearchResult sr = (SearchResult) results.next();
            Attributes attrs = sr.getAttributes();
            System.out.println(attrs);
            Attribute attr = attrs.get("uid");
        }
        dctx.close();
    }
}

例外是：

Exception in thread "main" java.lang.NullPointerException
    at org.springframework.ldap.core.support.AbstractContextSource.getReadOnlyContext(AbstractContextSource.java:125)
    at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:287)
    at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:237)
    at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:588)
    at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:546)
    at LDAPSearchTest.searchWithTemplate(LDAPSearchTest.java:47)
at LDAPSearchTest.main(LDAPSearchTest.java:33)

我正在使用 Spring 2.5.6 和 Spring LDAP 1.3.0

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1 回答 1

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快速扫描显示，罪魁祸首是该authenticationSource领域。AbstractContextSource该文件包含有关该afterPropertiesSet()方法的以下注释：

/**
* Checks that all necessary data is set and that there is no compatibility
* issues, after which the instance is initialized. Note that you need to
* call this method explicitly after setting all desired properties if using
* the class outside of a Spring Context.
*/
public void afterPropertiesSet() throws Exception {
    ...
}

authenticationSource如果您还没有提供一个，那么该方法会继续创建一个合适的。由于您上面的测试代码绝对不是在 Spring 上下文中运行，并且您没有明确设置authenticationSource，我认为您需要按如下方式编辑您的代码：

...
cs.setDirObjectFactory(factory.getClass ());

// Allow Spring to configure the Context Source:
cs.afterPropertiesSet();

LdapTemplate template = new LdapTemplate(cs);
于 2011-10-24T03:11:44.667 回答