The frequent use of the Java EE 13 specification--java rookie growth note

Introduction

Through this period of study, the beauty of its name is read the study of the Java EE video. However, there is no egg to use, the video will be a thing

Ah. Anyway, I did not look clear, helpless, can only be one side to watch the video, while reading, while Baidu, in fact, the role of the biggest or Baidu, what

No A clear noun or something is settled by this thing.

The most critical of the video is the 13 specifications in the Java EE, which is one of the learning videos

one of the most for an important purpose, in that case, here's a summary of the 13 most frequently used Java specifications.

First, JNDI (Java naming and Directory Interface)

Jndi is a set of APIs that access the naming and folder services in a Java application. Through the different access interface Jndi Service Supply Interface (SPI) implementation,

The Jndi API is mapped by the manager into a specific naming service and folder system, enabling Java applications to

Line interaction. For a lot of other introductions to Jndi, please refer to my blog, "Jndi Brief Introduction".

Second, JDBC (Java Data Base Connectivity)

JDBC provides a unified way to access the database's API, which provides a unified interview for a variety of relational databases, and avoids the traditional

We don't have to write different access codes for different databases. Now we have access to MySQL or the orcal database to be able to use one way. This

It is also a very good embodiment of the Java language Features "write once, execute everywhere."

Third, RMI (Remote Method invocation)

This protocol invokes a method on a remote object that uses serialization to pass data between the client and the server, allowing the original program to operate in the same

The method call of the system becomes the method call of the program between different operating systems, that is, the RMI mechanism realizes the communication between the program components and the different operating systems. it

is a lower-level protocol that is used by EJBS.

Serialization of objects The popular understanding is that when we define a class myclass ourselves, or whatever the object of a class, it is converted to a byte array,

Can be placed in a byte array. At this point, since we put it in a byte array. Of course we were able to dispose of her at will. The most used is