java ee architecture tutorial

Entity Bean: Provides robust data persistence. The bean container handles most of the data integrity, resource management, and concurrency features, allowing developers to focus on business logic and data processing, rather than these low-level details. When using bean-managed persistence (Bean Managed persistence,bmp) entity beans, developers write persistent code and the container determines when the code executes. When using container-managed persistence (Container Managed Persistence, CMP) e

data and data. Although the Jetspeed provides a rich portal technical function, but its customization is poorer, its important content component slide is also more difficult to understand, its security control framework and general Java EE use Jaas not to merge, All of this creates the difficulty of two development on its basis. Liferay Liferay (http://www.liferay.com) represents a complete

1. What is design modeDesign patterns provide a solution to common application design problems. In object-oriented programming, design patterns typically address issues related to object creation and interaction, rather than the large-scale problems faced by the overall software architecture, which provide a common solution in the form of boilerplate code that can be applied to real-world problems. Typical class diagrams are shown in 1-1.Figure 1-1 sh

Label: I think we all know what ODBC is? ODBC (opendatabaseconnectivity. Open Database Interconnect (wosa,windowsopenservicesarchitecture) is an integral part of the database in Microsoft's Open Services architecture It establishes a set of specifications and provides a set of standard APIs (application programming interfaces) for access to the database. JDBC (Java Data Base Connectivity,

some basic framework, not discussed here. The following is the layered architecture of Java EE: The DAO layer, the business layer, the control layer, the display layer of the exception processing to do an analysis, and give the general processing criteria. First, DAO layer exception handling If you use the spring DAO template for implementation, the DAO layer

In struts+hibernate this kind of structure, is should not pass the PO that hibernate produces directly to JSP, whether he is iterator, or list, this is a design error. Let me talk about the data representation for each layer in the Java EE architecture: The data representation of the Web layer is Formbean, and the data comes from the HTML Form POST The data re

Tags: java ee JDBC is similar to ODBC as a specification and provides the API for database access. Advantages 1.JDBC provides unified access to a variety of databases. The popular point: with JDBC you do not have to write different programs for different databases, just use the JDBC API to write a program, you can directly send SQL calls to the appropriate database. 2. Write once

In the previous blog, the general introduction of transactions, in fact, in the enterprise Application server transactions are at different levels exist. A relatively simple transaction is the bottom-level transaction, which is the transaction management at the resource levels. Assuming that the data is ultimately stored in a relational database, the lowest-level transaction is located here. We call this a resource-local transaction (resource-localtransaction) in most cases where the developer h

Step1. Overview of the situationHello, little friends, long time no see, before sharing with you three layers of architecture and MVC thought, I believe we have a relatively clear personal understanding of the two pieces of content, since we talked about MVC, here we continue this piece of content continues to go deeper, today we look at the V-view in MVC That is what we call the view layer.Step2. View TechnologyFor our web developers, the concept of

provides the capability extensibility of components and other server-side objects by customizing them. Faster compilation times It validates the expression language at compile-time. High performance rendering capabilities. JSF (JavaServer Faces) technology supports a variety of tag libraries to add components to a Web page. To support the JavaServer Faces tag library mechanism, Facelets uses XML namespace declarations.The following table shows the tag libraries supported by the

Joking, original source: http://java.sun.com/developer/technicalArticles/J2EE/AJAX/ In English and Chinese as follows, all are my own translation, the level is limited (6 grade test 78 points), welcome correction: Asynchronous JavaScript Technology and XML (AJAX) With Java 2 Platform, Enterprise Edition --"Asynchronous Javascript+xml technology and Java EE" by G

The first thing that can handle a request when learning javaweb, because this thing opens the door to the entire Java EE to create countless possibilities!The life cycle of the servlet, which defines its life cycle in the Javax.servlet.Servlet interface1. The client requests the servlet;2. Load the servlet class into memory;3. Instantiate and initialize the servlet;4.init () initialization parameters;5.serv

. Bruce Eckel even advocates the unChecked exception as a standard usage. And published an article to test whether the checked exception should be removed from java. Bruce Eckel: "when there is a small amount of code, the checked exception is undoubtedly a very elegant concept and helps avoid many potential errors. However, experience shows that the results are the opposite for a large number of codes"For more information about checked and unChecked e

an interface. As for how to implement this interface, this is not important. As soon as you get a class that implements this interface, you can easily inject the implementation class into the class that invokes the interface through an XML configuration file. This dependency between all classes is completely superseded by the configuration file. So the core of the spring framework is the so-called dependency injection and control inversion. Now the structure is, struts is responsible for the di

> One Package> A Struts>The struts tag is the root node tag;The package tag is a packet label, its Name property is customized, but its namespace property is a very important property. The property must be exactly the same as defined by the a tag in index.jsp; extends indicates which package inherits, here is the default package Struts-default, which is a very important package, without which the meaning of struts2 is not used.The action tag corresponds to a method for processing a JSP page

Currently, the Java 2 Platform Enterprise version (EE) architecture is highly respected in both the vendor market and the developer community. As a tool, Extensible Markup Language (XML) simplifies data exchange, interprocess messaging, and thus becomes attractive to developers and is becoming popular. Naturally, the idea of accessing or integrating XML solutions

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handling a request this belongs to the session. See maintaining Client State. Request Subtype ofjavax.servlet.ServletRequest WEB components handling the request. Page javax.servlet.jsp.JspContext The JSP page that creates the object. 17.3.2Controlling Concurrent Access to Shared ResourcesIn a multithreaded server, the shared resources can be accessed concurrently. In addition to scope object attributes, shared resources include in-memory

Part I.Basic knowledge of Java language. Includes exceptions, IO streams, multiple threads, collection classes, databases. (Keep in mind that basic knowledge must always be consolidated, note, if you want to learn Java-ee as fast as you can, about the swing knowledge, only do understand) Requirements: Java encapsulatio

Scope Description Singleton A bean definition corresponds to an object instance in each spring IOC container. Prototype A bean definition corresponds to multiple object instances. Request In an HTTP request, a bean definition corresponds to an instance, that is, each HTTP request will have its own bean instance, which is created from a bean definition. This scope is valid only in the Web-based sp