java certification track

Certification is the process of trying to prove who a user is. For authentication, a user needs to provide some form of identification that the system can understand and trust. The technical terms that we need to understand in this process include:subject--refers to the current operator, which can be a person (user), a third-party program, and any other person or thing that interacts with our application.principals--is a subject attribute, such as use

Most commercial Web sites provide site authentication to protect certain limited resources, HTTP protocol and Java EE specification of the WEB site certification process has been detailed definition, common browsers can provide the corresponding interface form to help users complete the site certification process. However, in some cases, we need to write programs

difference between error and exception?Error indicates a serious problem in situations where recovery is not impossible but difficult. For example, memory overflow. It is impossible to expect the program to handle such situations.Exception represents a design or implementation issue. That is, it means that if the program runs normally, it never happens.Ninth, give me one of your most common runtime exception.Cmmexception, Concurrentmodificationexception, Domexception, Emptystackexception, Illeg

difference between error and exception?Error indicates a serious problem in situations where recovery is not impossible but difficult. For example, memory overflow. It is impossible to expect the program to handle such situations.Exception represents a design or implementation issue. That is, it means that if the program runs normally, it never happens.Ninth, give me one of your most common runtime exception.Cmmexception, Concurrentmodificationexception, Domexception, Emptystackexception, Illeg

Implementation method: Import java.util.Hashtable; Import Javax.naming.Context; Import javax.naming.NamingEnumeration; Import Javax.naming.ldap.InitialLdapContext; Import Javax.naming.ldap.LdapContext; public class Ldapauth { private String domain; Private String Ldaphost; Private String searchbase; Public Ldapauth () { This.domain = "{domain}"; This.ldaphost = "ldap://{ip}:{port}"; This.searchbase = "DC={DC},DC={DC}"; } Public Ldapauth (String domain,string host,string dn) { This.domain = d