e491. getting an attribute's schema from the directory.txt

这里面包含了一百多个JAVA源文件

This example reads an attribute's schema from the directory. 
    try {
        // Get an attribute of that type
        Attributes attrs = ctx.getAttributes("cn=Ted Geisel, ou=People", new String[]{"cn"});
        Attribute cnAttr = attrs.get("cn");
    
        // Get its attribute definition
        DirContext cnSchema = cnAttr.getAttributeDefinition();
    
        // Get cnSchema's attributes
        Attributes cnAttrs = cnSchema.getAttributes("");
    } catch (NamingException e) {
    }