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2. Serving Servlets to URLsThe The The URL/status/* in the following example is mapped to a servlet called getstatus. If a servlet is defined by a container in http: // example.roguewave.com/, this element tells the container that getstatus servlet will access requests startingHttp: // example.roguewave.com/examples/st
(1) Loading Sequence of different elements in Web. xml
The order of loading is irrelevant to their order in the web. xml file. That is, the filter will not be loaded first because the filter is written before the listener.
Web. the XML
Take spring as an example to see the load order:Spring loading can be implemented using Servletcontextlistener or Load-on-startup Servlet implementations, but for example, the filter needs to use the bean, but the load order is: loading the filter after the spring , the bean in the initialization operation in filter is NULL, so if you want to use the bean in the
I. Overview1. When starting a Web project, the Web container reads its config file, XML, and reads 2, emergency, allow to create a ServletContext (servlet context), all parts of this Web project will share this context.3, the container will be 4. Create a listener for the cl
walk Springdispatcher, I also configured in spring some static file paths such as Css,js, (in fact, these static files can also be accessed through the default servlet) Css,js Path - mapping= "/resource/**" location= "/resource/"/>3, some questions:about A, "/" means: if there is no other matching servlet, then this servlet will be the default
control to the next filter. A filter in DoFilter () Method ends. If a filter wants to stop the request processing and get full control of the response, it can not invoke the next filter.Of these three, servlet and filter can be configured mapping, that is, for which address requests use these servlets or filter, and listener is based on the implementation of the interface to determine what the situation calls this listener, The basic listener only pe
Recently nothing to do, write their own small project (the project cycle is infinite, the development efficiency is unlimited), encountered the DTD declaration of Web. XML is not correct, here is the new project from Eclipse, the auto-generated Web. XML, for later encounter similar problems for reference. Of course,
Add servlet configuration information to Web. xml
Using Eclipse to create a servlet will automatically be declared in Web. xml under Web-inf, but sometimes we need to write the
Define and map servlet in the web. xml fileIn the Web. xml file, you must first define a servlet instance and then map the instance to one or more URL patterns.
1. Define the servlet in
This article is translated from javaeye. I didn't know why when I configured web. XML in the past. I understood a lot after reading it. Post it and share it with you!
Common web. XML elements
The listener element specifies the event listener class.However, this URL is often changed so that the
Two parameters can be defined in web. xml:1. parameters within the application range are stored in servletcontext and configured in web. xml as follows:
Copy codeThe Code is as follows:
2. servlet parameters can only be obtained in the s
servlet Web. XML header information for different versions (2.3,2.4,2.5,3.0)Studied: 360080972.5 XML version= "1.0" encoding= "UTF-8" ?> Web-app version="2.5" xmlnsxmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance" xsi: schemalocation= "Http://java
Servlet-mapping provides a URL for the servlet class to access your servlet in the address bar, for example:Enter Http://localhost:8080/hello in the address bar to access the
Tomcat presses/index.jsp to find mapping in Web. XML, find name: Find class by name:
, so access to it requires an address, so only the address map of the web is resolved.How to do address mapping?By modifying the Web. xml file.The code is as follows:////////////////////////////////////////////////////////////////////////////////////////////The purpose of the address mapping is to use the servlet, whic
compared with the parameters in get Context-param:This refers to the current objectString uri=this.getinitparameter ("uri"); Gets the value in the Init-paramString driver=this.getinitparameter ("Driver"); Gets the value in the Init-paramSystem.out.println ("uri=" +uri+ "" + "driver=" +driver); Print outputSum up:Note: Context-param and Init-param inside the parameter value can only have one, many will error.When we want a servlet in the entire
Javax.servlet.http.HttpServletRequest; /*** The class is defined by a filter (you can just put it under the bag), when it's used to struts2 useful to the servlet,* This filter must be used to filter all servlets once, otherwise the servlet will not function properly.* Also in Web. XML, add the filter in front of the c
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