J2EE. Web Server, application server. What's the difference?
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A web server is like a library. You ask for a book and you get the same book every time. An application server is like a bank, you ask for your account balance, and it might be different each time you ask. You can also ask to have your balanced changed (by depositing or withdrawning money).\n\nAll web application servers are web servers. They can service requests for static files, like a library. They can also service transaction requests, like a bank. Not all transactions are about money, by the way. Yahoo Answers is an application server that is processing your request to post a question and my request to post an answer; these are transactions because the state of the information on the server changes after each request. It is possible to have an application server that is not a web server, for example multiplayer online games are often implemented with servers.\n\nTomcat is a good application server to work with when you are starting out. WebSphere costs money to run, at least commerically, but it comes with some customer support. Struts is a component that can be installed in a java web application server that makes writing database based application servers easier. It is essentially some source code that you can use so you don't have to write the whole thing yourself.
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.NET if you want to code faster and is for windows..and J2EE if you want to make something really platform independent
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The SDK contains all the "DEVELOPMENT" modules you require as a Java Developer, and the JRE is the Java Runtime Enviroment, that helps in executing the Compiled classes that you make with the SDK
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J2EE is helpful in developing multitire enterprise application. you can go through this link also
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Web Sphere is IBM's combined EJB/CORBA server for high-volume applications.\nWebSphere is a set of Java-based tools from IBM that allows customers to create and manage sophisticated business Web sites. The central WebSphere tool is the WebSphere Application Server (WAS), an application server that a customer can use to connect Web site users with Java applications or servlets. Servlets are Java programs that run on the server rather than on the user's computer as Java applets do. Servlets can be developed to replace traditional common gateway interface (CGI) scripts, usually written in C or Practical Extraction and Reporting Language, and run much faster because all user requests run in the same process space. \nIn addition to Java, WebSphere supports open standard interfaces such as the Common Object Request Broker Architecture (CORBA) and Java Database Connectivity (JDBC) and is designed for use across different operating system platforms. One edition of WebSphere is offered for small-to-medium size businesses and another edition for larger businesses with a higher number of transactions. WebSphere also includes Studio, a developer's environment with additional components that allow a Web site's pages to be created and managed. Both editions support Solaris, Windows NT, OS/2, OS/390, and AIX operating systems. \n\nWebSphere Studio includes a copy of the Apache Web server so that developers can test Web pages and Java applications immediately.
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If J2EE was as bad as you think it is, why is it so widely used? Answer: it's not.\n\nIt's been a very long time since this technology could be accused of being generally inefficient. JIT and adaptive in-time compilers can actually recompile byte-code into assembley during runtime depending on how it's currently being used. This can produce faster execution in certain cases than C or C++.\n\nMost of the pain comes from starting the runtime, in an enterprise environment this is not an issue.\n\nPS. Remember it's just a specification. If you want to do Java just like C# (ie. compiled and ready to go as a binary), take a look at http://gcc.gnu.org/java/
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An application server is a server computer in a computer network dedicated to running certain software applications. The term also refers to the software installed on such a computer to facilitate the serving (running) of other applications.\n\nApplication server products typically bundle middleware to enable applications to intercommunicate with various qualities of service — reliability, security, non-repudiation, and so on. Application servers also provide an API to programmers, so that they don't have to be concerned with the operating system or the huge array of interfaces required of a modern web-based application. Communication occurs through the web in the form of HTML and XML, as a link to various databases, and, quite often, as a link to systems and devices ranging from huge legacy applications to small information devices, such as an atomic clock or a home appliance.\n\nPortals are a very common application server mechanism by which organizations can manage information. They provide a single point of entry for all users, they can access Web services transparently from any device, and they are highly flexible. Portals can work inside or outside of the organization, and they can attach themselves to any part of it.\n\n\n\nThe term Web server can mean one of two things:\n\nA computer that is responsible for accepting HTTP requests from clients, which are known as Web browsers, and serving them Web pages, which are usually HTML documents and linked objects (images, etc.). \nA computer program that provides the functionality described in the first sense of the term\n\nAlthough Web server programs differ in detail, they all share some basic common features.\n\nHTTP responses to HTTP requests: every Web server program operates by accepting HTTP requests from the network, and providing an HTTP response to the requester. The HTTP response typically consists of an HTML document, but can also be a raw text file, an image, or some other type of document; if something bad is found in client request or while trying to serve the request, a Web server has to send an error response which may include some custom HTML or text messages to better explain the problem to human people (people trying to fetch a web page, etc.). \nLogging: usually Web servers have also the capability of logging some detailed information, about client requests and server responses, to log files; this allows the Webmaster to collect statistics by running log analyzers on log files. \nIn practice many Web servers implement the following features too.\n\nConfigurability of available features by configuration files or even by an external user interface. \nAuthentication, optional authorization request (request of user name and password) before allowing access to some or all kind of resources. \nHandling of not only static content (file content recorded in server's filesystem(s)) but of dynamic content too by supporting one or more related interfaces (SSI, CGI, SCGI, FastCGI, PHP, ASP, ASP .NET, Server API such as NSAPI, ISAPI, etc.). \nModule support, in order to allow the extension of server capabilities by adding or modifying software modules which are linked to the server software or that are dynamically loaded (on demand) by the core server. \nHTTPS support (by SSL or TLS) in order to allow secure (encrypted) connections to the server on the standard port 443 instead of usual port 80. \nContent compression (i.e. by gzip encoding) to reduce the size of the responses (to lower bandwidth usage, etc.). \nVirtual Host to serve many web sites using one IP address. \nLarge file support to be able to serve files whose size is greater than 2 GB on 32 bit OS. \nBandwidth throttling to limit the speed of responses in order to not saturate the network and to be able to serve more clients.
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1. Official information: http://www.w3.org/2002/ws/\n2. If you are going to use java - http://java.sun.com/webservices/ will show you how you can use it.\n3. Here is a short example: http://java.sun.com/j2ee/1.4/docs/tutorial/doc/Session3.html
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Spring is easier to setup and to grasp. You can use POJO (plain old java objects) which can run outside of an EJB container. This makes them easier to test. You don't need the whole application server infrastructure to run your code.\nYou can more easily focus on the problem domain instead of the software infrastructure.
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IBM Websphere is java application server software. Competes with BEA Weblogic, JBOSS, Caucho Resin.
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Sun's J Studio is the perfect replacement of Visual Studio.NET and the Java Server Faces Technology stands firm against the .NET technology!
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If you need a "Java Client". Here is the Download site. What you need is the "Java Runtime Enviorment".\n\nhttp://www.java.com/en/download/manual.jsp
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Request.ServerVariables["REMOTE_ADDR"].ToString() \n\n\n"REMOTE_ADDR" is just string. It's built in.
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Struts is from Apache. It's a Java Server Pages framework for creating web components. JSP itself is a subset of Java 2 Enterprise Edition.\nSince struts is part of Java (runs under Java), it's available on most platform that supports Java 2 Enterprise Edition (J2EE)\nMore information is available from Apache Struts website.
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I am not sure how to configure Sun's Application Server, but why not try Tomcat? it's downloadable from http://tomcat.apache.org/, it's free, and it's very easy to install and use
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Download the enterprise version, that will have every support to the servlets, ejb, etc.\n\nhttp://java.sun.com/j2ee/1.4/download.html\n\nBut, you need application servers to run your servlets, ejb, etc.  You can download many free servers for your testing and learning purpose.
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Java Servlet \nThe Java Servlet API, invented by Sun Microsystems, allows a software developer to add dynamic content to a web server using the Java platform. The generated content is commonly HTML, but may be other data such as XML. Servlets are the Java counterpart to dynamic web content technologies such as CGI, PHP or ASP. Servlets can maintain state across many server transactions by using HTTP Cookies, session variables or URL rewriting.\n\nThe Servlet API, contained in the javax.servlet package hierarchy, defines the expected interactions of a web container and a servlet. A web container is essentially the component of a web server that interacts with the servlets. The web container is responsible for managing the lifecycle of servlets, mapping a URL to a particular servlet and ensuring that the URL requester has the correct access rights.\n\nA Servlet is an object that receives requests (ServletRequest) and generates a response (ServletResponse) based on the request. The API package javax.servlet.http defines HTTP subclasses of the generic servlet (HttpServlet) request (HttpServletRequest) and response (HttpServletResponse) as well as an (HttpSession) that tracks multiple requests and responses between the web server and a client. Servlets may be packaged in a WAR file as a Web application.\n\nMoreover, servlets can be generated automatically by Java Server Pages (JSP), or alternately by template engines such as WebMacro. Often servlets are used in conjunction with JSPs in a pattern called "Model 2", which is a flavor of the model-view-controller pattern