Here I talk about me in learning J2EE processes and talk about the experience and lessons of receipts in this process. In order to be less bent less. Java has developed to now, according to application scores, three major blocks: J2SE, J2ME and J2EE. These three are complementary, the application range is different. J2se is the standard version of Java2, mainly for desktop applications. J2ME is primarily applied to embedding is system development, such as mobile phones and PDA programming; J2EE is a java2 enterprise version, mainly for distributed network programs, Such as e-commerce websites and ERP systems.
1) First study J2SE To learn J2EE, you must first learn J2SE. Just start learning J2SE first recommend not use IDE, then gradually transition to the development of IDE, after all, use it easy. Learn J2SE Recommend three books, "Java2 Core Technology", "Java Programming Thoughts", "Java Mode". Among them, "Java Programming Thoughts" should be studied and intensive. This period of time is basic skill, the time will be very long, or it may be short, it depends on the level of the learner.
Don't be entangled in the process of learning Java and J2EE, you will encounter the five-flowers of IDE, don't be confused by them, learn Java, to learn language itself, don't care too much about the additional features of IDE, Java programming in different IDE The conversion between the conversions is easy, and the function of too much Ide is easy to delay the understanding of the language itself. The current popular IDE has JBuilder, Eclipse, and Eclipse to enhance WSAD. It is possible to use one of them, it is recommended to start J2EE from Eclipse. Because JBuilder is more suitable for writing a J2SE program.
2) Select and Learn Server Use Configuration When you have J2SE and IDE experience, you can start J2EE's learning, web server: tomcat, do not doubt, Tomcat is preferred for learning web services. The application server currently has three main: JBoss, WebLogic, WebSphere. There are many projects to start using jboss, and there are a lot of companies to start doing WebSphere or WebLogic transplantation to the JBoss application server (cost savings), what to say is, learning Tomcat and JBoss I think it is preferred, and it is the easiest to get started. Learning Server Use the configuration to ask questions about experienced people (with conditional words), because they can solve the problem, you can get online to explore it. You should have two days (I have to do this stupid), we should Put the main time in learning principles and theory, a particular technology uses to replace a person's knowledge and learning.
3) Learn Web Knowledge If you are doing an e-commerce website, you may have to act as a few characters, this is what you need to learn: HTML, you may have to use Dreamwave and other IDEs. JavaScript, learn simple data verification, data linkage display, etc.
4) J2EEAPI Learning learning J2EEAPI and learning server should be an iterative process. First learn JSP and servlet programming, a lot of books, I have established two "JSP Design" and "Java Servlet Programming" of Oreilly, and OREILLY is always excellent, I have to admire. Learning a JDBC database programming, most of the J2EE project is a MIS system, and the access database is the core. This should belong to J2SE learning, here to take it out. Learning JNDI API, it can be combined with learning EJB. Learn the EJB API, the recommendation "Jing EJB" has passed the above learning, probably can deal with the general application. Another learning method: followed by Sun's "J2EE TUTORIAL", J2EE-Tutorial is a very good entry textbook. 5) Learning EJB Design Mode and See Code (Most Important) Design mode is practicing internal work, its importance can be said, if you don't use the design mode, you will write a bunch of garbage, slow It is also a bunch of bugs, the result is better not to implement EJB (EJB is not equal to j2ee) No matter what language, you should look at a lot of code, you see the code amount is less than a certain amount, you are not good J2EE, and see the code is also A good way to learn someone else's programming habits and norms, sometimes you don't know how bad it is written by your code, :)
There are currently many open source projects that can be used as a textbook: Jive Forum PetStore Sun Dune Sun, etc., study one, and use it in your own project.
6) J2EE Other learning When you gradually understand J2EE, you have to pay attention to some of the technologies in the current field, J2EE is a hundred homologous areas, everyone presents their own solutions, such as Struts, Hibernate, Ofbiz, etc., learn these things to be your project and goals, pre-supplement that there is no taste, but do not involve too deep, after all, the principle and theory are the most important thing.
7) Utilize the network resources Java manual http://www.javaalmanac.com/ excellent online help open source website http://www.sourceforge.net/j2ee discussion http://www.theserverside.com/
8) Learning the Extreme Programming J2EE project is a project of multi-person cooperation, and it is also a kind of project that is difficult to commission. If there is no good project plan, you can't do J2EE projects, understanding and project development management related knowledge is also necessary project management: Ant, similar to MAKE model management: CVS, etc., such as WinCVS, Tortoise CVS unit test : JUnit, get rid of the original method pressure test of the inserted main to class: Jmeter, open source project, simple, easy to use
Currently J2EEAPI JAVASERVER PAGES (JSP) Technology 1.2 Java Servlet Technology 2.3 JDBC API 2.0 Java XML Processing API (JAXP) 1.1 Enterprise JavaBeans Technology 2.0 Java Message Service (JMS) 1.0 Java Named Directory Interface (JNDI) 1.2 Java Transaction API (JTA) 1.0 JavaMail API 1.2 JavaBeans Activation Architecture (JAF) 1.0 J2EE Connector Architecture (JCA) 1.0 Java Authentication and Authorization Services (JAAS) 1.0 Learning Some APIs above should be fixed by your project, understand all them are good The above is confirmed by the sentence, Java language itself is not difficult, but there are too many technologies, so learn Java is very hard. Recalling, basically every beginner, may ask someone to ask others when just studying Java, which method do you know (API)? Oh, no one, only hand ripe. -
If the highest realm of the sword method is unprocessed, the highest realm of programming should be the case.
