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Struts Html Tag Library SelectJAVA Struts Tutorials - Technical and managerial tutorials shared by internet community. You can submit your tutorial to promote it. What are the main differences between struts 1 and struts 2, components difference between struts 1.x and struts 2.x, Functional difference between struts 1.x and. Se vuoi aggiornamenti su Jsp Custom Tag Library inserisci la tua e-mail nel box qui sotto. この記事では、Web ベースのアプリケーションでの動的データの処理が Apache Struts 2 によっていかに楽になるかを学びます。. If for some reason the blank template or archetype doesn't work out, we can just setup an application from scratch. Setup the Web Application File Structure. Struts 2 Configuration Files. This chapter will take you through basic configuration required for a Struts 2 application. Here we will see what will be configured in few important configuration files : web. Honestly speaking you can survive using web. The web. xml file. The web. xml configuration file is a J2. EE configuration file that determines how elements of the HTTP request are processed by the servlet container. It is not strictly a Struts. Struts. 2 to work. As discussed earlier, this file provides an entry point for any web application. The entry point of Struts. Hence we will define an entry of Filter. Dispatcher class in web. The web. xml file needs to be created under the folder Web. Content/WEB- INF. This is the first configuration file you will need to configure if you are starting without the aid of a template or tool that generates it (such as Eclipse or Maven. Following is the content of web. UTF- 8"?>. < web- app xmlns: xsi="http: //www. XMLSchema- instance". Location="http: //java. Web. App_ID" version="3. Struts 2< /display- name>. Filter. Dispatcher. Note that we map the Struts 2 filter to /*, and not to /*. We will cover this when we will go through the Annotations chapter. The struts. xml file. The struts. xml file contains the configuration information that you will be modifying as actions are developed. This file can be used to override default settings for an application, for example struts. Mode = false and other settings which are defined in property file. This file can be created under the folder WEB- INF/classes. Let us have a look at the struts. Hello World example explained in previous chapter. UTF- 8"?>. < ! DOCTYPE struts PUBLIC. Apache Software Foundation//DTD Struts Configuration 2. EN". "http: //struts. Mode" value="true" />. Hello. World. Action". Hello. World. jsp< /result>. The first thing to note is the DOCTYPE. All struts configuration file need to have the correct doctype as shown in our little example. Here < package> allows separation and modularization of the configuration. This is very useful when you have a large project and project is divided into different modules. Say, if your project has three domains - business_applicaiton, customer_application and staff_application, you could create three packages and store associated actions in the appropriate package. The package tag has the following attributes: Attribute. Descriptionname (required)The unique identifier for the packageextends. Which package does this package extend from? By default, we use struts- default as the base package. If marked true, the package is not available for end user consumption. Unique namespace for the actions. The constant tag along with name and value attributes will be used to override any of the following properties defined in default. Mode property. Setting struts. Mode property allows us to see more debug messages in the log file. We define action tags corresponds to every URL we want to access and we define a class with execute() method which will be accessed whenever we will access corresponding URL. Results determine what gets returned to the browser after an action is executed. The string returned from the action should be the name of a result. Results are configured per- action as above, or as a "global" result, available to every action in a package. Results have optional name and type attributes. The default name value is "success". Struts. xml file can grow big over time and so breaking it by packages is one way of modularizing it, but struts offers another way to modularize the struts. You could split the file into multiple xml files and import them in the following fashion. UTF- 8"?>. < ! DOCTYPE struts PUBLIC. Apache Software Foundation//DTD Struts Configuration 2. EN". "http: //struts. The other configuration file that we haven't covered is the struts- default. This file contains the standard configuration settings for Struts and you would not have to touch these settings for 9. For this reason, we are not going into too much detail on this file. If you are interested, take a look into the at the default. The struts- config. The struts- config. View and Model components in the Web Client but you would not have to touch these settings for 9. The configuration file basically contains following main elements: SN Interceptor & Description. This is the root node of the configuration file. This is where you map your Action. Form subclass to a name. You use this name as an alias for your Action. Form throughout the rest of the struts- config. JSP pages. 3global forwards. This section maps a page on your webapp to a name. You can use this name to refer to the actual page. This avoids hardcoding URLs on your web pages. This is where you declare form handlers and they are also known as action mappings. This section configures Struts internals and rarely used in practical situations. This section tells Struts where to find your properties files, which contain prompts and error messages. Following is the sample struts- config. ISO- 8. 85. 9- 1" ?>. DOCTYPE struts- config PUBLIC. Apache Software Foundation//DTD Struts Configuration 1. EN". "http: //jakarta. Form Bean Definitions ============ - ->. Login. Form" />. Global Forward Definitions ========= - ->. Action Mapping Definitions ======== - ->. Login. Action" >. Main. Menu. jsp" />. Login. View. jsp" />. Controller Definitions ======== - ->. Type="text/html; charset=UTF- 8". File. Size="1. 6. M". locale="true". For more detail on struts- config. The struts. properties file. This configuration file provides a mechanism to change the default behavior of the framework. Actually all of the properties contained within the struts. But if you like to keep the things separate and more struts specific then you can create this file under the folder WEB- INF/classes. The values configured in this file will override the default values configured in default. There are a couple of properties that you might consider changing using struts. When set to true, Struts will act much more friendly for developers. Mode = true. ### Enables reloading of internationalization files. Enables reloading of XML configuration files. Sets the port that the server is run on. Here any line starting with hash (#) will be assumed as a comment and it will be ignored by Struts 2. Difference Between Struts 1.
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