Author: bluesky35 (blue) development environment: Windows2000 JBuilderX Tomcat4.0.6 Introduction: Hello everybody, I'm bluesky35 (blue), although very busy recently, but still did not forget to write a few original articles up and share with everyone, I hope you Can support me. This article is about custom TAG parsing. I believe everyone has used Struts's custom label library. Write You can display a Text box. When I first use Struts, I feel very magical. How is IE to identify this label and analyze it into a text box? Let's uncover the mystery of the custom label together. 1. Newly build a project in JBuilderx Taken myTaglib.2. Next, let's make a servlet, call the JSP file containing custom TAG through the servlet. Create a package called MyServlet.SRC in the Project Root Catalog, then select Menu File-> New-> Web -> Servlet Creating a servlet called MyServlet, Package Select MyServlet.src, Web Module's Web Module named WebModule1, as shown below: Modify MyServlet, code as follows: package myservlet.src;
Import javax.servlet. *; import javax.servlet.http. *; import java.io. *; import java.util. *;
Public class myservlet extends httpservlet {private static final string content_type = "text / html; charSet = shift_jis";
// Initialize Global Variables Public Void Init () THROWS ServleTexception {}
// Process the HTTP Get request public void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {response.setContentType (CONTENT_TYPE); String scope = request.getParameter ( "txtscope"); request.getRequestDispatcher ( "/ jsp / bluesky .jsp "). Forward (Request, Response);
// Clean Up Resources Public Void Destroy () {}} is OK, the servlet is configured, let's take a look at the current environment, as shown below: Take a break, let's go to formally enter the custom TAG writing. 4. Right-click Module Directory to select New-> Directory, build a directory named JSP, then right-click the JSP directory Select New-> JSP new JSP file, the content is as follows: <% @ Page ContentType = "text / html CHARSET = GB2312 "%>
<% @ Taglib prefix =" bluesky "URI =" Bluesky-taglib "%>
bluesky </ title> <body bgcolor =" # fff "> <form method = "post"> <br> <br> <bluesky: text color = "# ff0000" blueskytext = "I am bluesky" name = "bluesky" /> </ form> </ body> </ html> perhaps you It has been seen, <bluesky: text color = "# ff0000" blueskytext = "i am bluesky" name = "bluesky" /> is the box we want to resolve, Bluesky: Text is our custom Tag, Color, BlueskyText and Name is our custom Property, we will parse in the code below. Ok, let's continue ^ - ^. 5. In order to parse the TAG in Bluesky.JSP, we must first define Property about TAG, right-click Module Directory Select New-> Directory, create a directory named TLDS, then right-click the TLDS directory Select New-> file, create a new TYPE to the TLD type, named myTLD TLD file, defined the information of the TAG-related Property, the content is as follows: < XML Version = "1.0" encoding = "gb2312"?> <! doctype taglib public "- // sun microsystems, Inc.//dtd jsp tag library 1.1 // en" "http://java.sun.com/ J2EE / DTDS / WEB-JSPTAGL Ibrary_1_1.dtd "></p>
<p><taglib> <Tlibversion> 1.0 </ tlibversion> <jspversion> 1.1 </ jspition> <shortname> Bluesky Library </ ShortName></p>
<p><! - text -> <tag> <name> text </ name> <tagclass> mytag.src.text </ tagclass> <bodycontent> jsp </ bodycontent> <info> my text tag </ info> < attribute> <name> color </ name> <required> false </ required> <rtexprvalue> true </ rtexprvalue> </ attribute> <attribute> <name> blueskytext </ name> <required> false </ required> < RTEXPRVALUE> TRUE </ RTEXPRVALUE> </ attribute> <attribute> <name> name </ name> <request> false </ required> <RTEXPRVALUE> TRUE </ RTEXPRVALUE> </ attribute> </ tag> </ taglib> Color, BlueskyText and Name have been defined inside. 6. Modify WebModule1 / Module Directory / Web-INF / Web.xml, add the following: <taglib> <taglib-uri> bluesky-taglib </ taglib-uri> < Taglib-location> / taglib-location> </ taglib> to this, the entire contents of Web.xml are as follows: <? XML Version = "1.0" encoding = "UTF-8"?> <! Doctype web-app public "- // sun microsystems, incaps//dtd web application 2.2 // en" "http://java.sun.com /j2ee/dtds/web-app_2_2.dtd "> <web-app> <display-name> Weservlet <servlet-name> MyServlet </ servlet-name> MyServlet </ servlet-name> <servlet-class> MyServlet .src.myservlet </ servlet-class> </ servlet> <servlet-mapping> <servlet-name> MyServlet </ servlet-name> <url-pattern> / myservlet </ url-pattern> </ servlet-mapping> <taglib> <</p>
<p>Taglib-uri> bluesky-taglib </ taglib-uri> <taglib-location> /ts/mytld.tld </ taglib-location> </ taglib> </ web-app> well, our definition work has been completed , Take a break ^ - ^, then we have to write code for these definitions, which is to parse the code of Color, BlueskyText, and Name. 7. Create a package called MyTag.src in the project root directory, right-click MyTag .src Select New-> Class, establish a class named text, we write the parsing code inside, text.java content is as follows: package mytag.src; import javax.servlet.jsp.jspexception; import javax.servlet.jsp.jspexception; import javax.servlet.jsp.jspexception; import javax.servlet.jsp.jspexception; import javax.servlet.jsp.jspexce .JspWriter; import javax.servlet.jsp.tagext.TagSupport; import javax.servlet.jsp.tagext.TryCatchFinally; public class text extends TagSupport implements TryCatchFinally {private String color = ""; private String text = ""; private String name = "" "" "" "" "" "; Public int dostarttag () throws jspexception {return skip_body;}</p>
<p>Public void Docatch (throwable arg0) throws throwable {}</p>
<p>Public int doendtag () THROWS JSPEXCE = pageContext.get (); html = "<input type = /" text / " " name = / "" this.name "/" " " Value = / "" this.text "/" " " style = / "background-color:" this.color "/" /> "; out.print (html);} catch (java.io .IoException e) {E.PrintStackTrace ();} returnval_page;}</p>
<p>Public void Dofinally () {}</p></div><div class="text-center mt-3 text-grey">
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