Question

请查看下面的测试课程。我正在尝试使用Spring LDAP模板进行LDAP搜索。通过使用方法searchWithoutTemplate（）中显示的DirContext，我能够搜索并生成与没有Spring LDAP模板的搜索条件对应的条目列表。但是当我使用LdapTemplate时，我最终会得到一个NPE，如下所示。我相信我一定会遗漏一些东西。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

Answer 1

快速扫描显示，authenticationSource的{{1}}字段是罪魁祸首。该文件包含AbstractContextSource方法的以下注释：

afterPropertiesSet()

如果您没有提供，那么该方法将继续创建适当的/** * 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 { ... }。由于上面的测试代码绝对是不在Spring上下文中运行，并且您没有明确设置authenticationSource，我认为您需要编辑代码，如下所示：

authenticationSource

Spring LDAP模板用法

1 个答案: