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One, servlet declaration cycleThe 1.Servlet declaration cycle is generally divided into four steps: Load, instantiate, service, destroy.2. Instantiation is performed only once throughout the life cycle.Second, JSP1.Servlet providing data to the JSPRequest.setattribute (,);Example: Request.setattribute ("Key", "Hello");2.Servl
1, the foreground JSP code himily.jsp, defines the user name and the password two input box, uses the Post method to Submit:/order-web/himilyservlet where Order-web is the site name, Himilyservlet Access path for servlet@ Page Language="Java"ContentType="text/html; Charset=utf-8"pageencoding="Utf-8"%>DOCTYPE HTML public "-//w3c//dtd HTML 4.01 transitional//en" "h
1 Servlet
A servlet is a server-side Java application that has platform-and protocol-independent features that can generate dynamic Web pages. It serves as the middle tier of a customer request (a Web browser or other HTTP client program) and a server response (a database or application on an HTTP server). A servlet
to see the content is different. (This is the most stupid explanation)How does a Dynamic Web page move? is the server according to the client's request parameters and other information, through the execution of the program to generate response content, and then return the content to the client, because the execution of the program is a change, so the resulting response content is also changeable.What are the execution programs on this server? Currently, there are CGI, PHP, ASP,
Js|servlet| Error | strategy | main text
Many people think JSP is Java to Microsoft ASP Challenge successful products, to today, around the JSP program developed Tag/el Technology, JSP as a Java BS foreground interface solution se
with the property name heresourcedebugextensionproperty. The structure of this property is as follows, first2byte represents the index value of the name, followed by a4bytes represent the length of the property, and the last array represents the property value. Write in FormatclassfileJVMcan be identified. Sourcedebugextension_attribute {U2 Attribute_name_index;U4 Attribute_length;U1 Debug_extension[attribute_length];}The JSR45 Standard solves the problem of mapping between
js|servlet| Tutorial
2 installation
2.1 Installing the servlet and JSP development tools
To learn about servlet and JSP development, you must first prepare a development environment that conforms to the Java
technology similar to JSP. There are two advantages to JSP compared with ASP. First, dynamic parts are written in Java, not VB script or other Microsoft languages, and are more powerful and easier to use. Second, JSP applications can be ported to other operating systems and to non-Microsoft Web servers.
, this feature is often free (or requires a very small investment ).
JSP and Its Features
JavaServer Pages (JSP) is a technology that implements common static HTML and dynamic HTML hybrid encoding. For details about the basic concepts of JSP, see JSP technology introduction.
Most pages generated by CGI programs are sti
For many years do not engage in Java Web Development, these days is the national Day holiday, relaxation is also interested in looking back to Java Web Development Technology Foundation.As we all know, servlet is an important foundation of Java Web development, but because of the relatively cumbersome
ways:Javax. servlet. http. httpsession. getservletcontext ()Javax. servlet. jsp. pagecontext. getservletcontext ()Javax. servlet. servletconfig. getservletcontext ())
4. Methods for obtaining relative paths and absolute paths in Java class4.1 obtain the absolute path in a s
js|servlet| | Getting Started Tutorial Java servlet and JSP Tutorials (2)
2 installation
2.1 Installing the servlet and JSP development tools
To learn about servlet and
, this feature is often free (or requires a very small investment ).
JSP and Its Features
JavaServer Pages (JSP) is a technology that implements common static html and dynamic HTML hybrid encoding. For details about the basic concepts of JSP, see JSP technology introduction.
Most pages generated by CGI programs are sti
The MVC structure diagram implemented by Java Web is as follows, in which the controller is implemented by servlet, the model is implemented by JavaBean, and most of the views are implemented by JSP page.
The basis of thoughtJsp+javabean Two-storey structure of the working principle should be more familiar, but also better understanding.But one thing must be cle
js|servlet| | Getting Started Tutorial Java servlet and JSP Tutorials (4)
3.3 Servlet for output HTML
Most servlet output HTML instead of plain text as in the example above. There are two additional steps to output HTML: Tell th
existing servers, if it doesn't support a servlet, adding that part is often free (or requires very little investment).
1.2 jsp and its characteristics
JavaServer Pages (JSP) is a common static HTML and Dynamic HTML hybrid coding technology, for the description of JSP basic concepts See "
)
Microsoft's ASP is a technology similar to JSP. There are two advantages to JSP compared with ASP. First, dynamic parts are written in Java, not VB script or other Microsoft languages, and are more powerful and easier to use. Second, JSP applications can be ported to other operating systems and to non-Microsoft Web s
Java Servlet and JSP Tutorials (2)
2 installation
2.1 Installing the servlet and JSP development tools
To learn about servlet and JSP development, you must first prepare a development e
Abstract class
Implements Some of the methods in the Servlet interface (Init,destroy)
HttpServlet
Inherits the Genericservlet abstract class, mainly implements the service method
JSP (Java Server page)
(1) JSPis what?Sunthe company developed a server-side dynamicPageTechnical Specifications.Note: JSPis a. JSPForsuffix of the fil
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