Triumphantly the Java EE Learning notes (ii) Java EE client/server

j2ee| Notes | server | client
Learn some Java EE every week, make some notes.

Goal: Be proficient in using WebSphere to do Java EE development work.

Come on! Come on!! Come on!!!



Figure 3 Java EE scene

The following should be noted in figure three:

1, Tier integration is the center of the Java EE programming model.

2, users use Browser way to access: 1 Browser: Use Html,http,xml. Possible firewall 2 Web container: Using Jsp,servelet,xml,javamail 3) EJB container: Using Back-end Enterprise beans,jms,jta,jdbc (o R connectors) 4 EIS Resources

3, the user uses stand-alone client way to access:      1) stand-alone client uses J2SE HTML HTTP XML to access Web Container, EJB Container can be accessed via web Container, then EIS resources      2) stand-alone client can access EJB directly Container can also directly access EIS resources      3) stand-alone client May is written in another Language.stand-alone client can be written in other languages.       4) Consider three types of stand-alone clients can have three types of stand-alone client:  & nbsp;        ※EJB client interacting directly with an EJB server EJB clients interact directly with EJB servers &N bsp;          ※stand-alone Java Application clients accessing Enterprise Information System (EIS) resources directly (may using JDBC or connectors) stand-alone Java program clients direct access to enterprise Information Systems (EIS) , possibly using JDBC and connectors            ※visual Basic clients consuming dynamic Web content  VB client  &nbsp using Dynamic Web content;                       In the form of XML data messages as XML



Figure 4 web-centric

The following should be noted in Figure four:

1, in the web-centric structure, there is no EJB Container at this time

2, browser can be used similar to the figure three, but the Web container use technology than figure three less than a javamail

3, the Web container can use JDBC Direct access to the EIS, you may also use the connector connectors to access the EIS as Figure three



Figure 5 Model-view-controller Process

Summary summary:

   Java 2 platform           Set of standards that streamline                   developent                   deployment                   Management of Enterprise application          Application written for the Java EE platform would run on any j2ee-compatible server   the benefits of Java-ee:           Simple development model           compatibility            can support existing systems            Server diversity           Development tools Diversity            Component Diversity (components)           simple, scalable security model