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<webdoclet> struts config TLD descriptors <war> web.xml
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Figure 12.2 Our reworked build process
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WORKING WITH TAG LIBRARIES
Tag libraries are the safest way to add code to JSP pages. That does not mean they are the easiest. Historically the creation of the XML taglib descriptor was one of those manual chores that added extra work to the build process. Like most manual stages, it is prone to error, and as it is not particularly complicated, it is an ideal target for automating. The tool for automating such a process is XDoclet. As we demonstrated in chapter 11, XDoclet is capable of examining source files and building XML, text, or source files based on tags used to mark up classes and source.
Creating a tag library First, we need a tag to mark up; we will write a simple one to test system happiness and return an error code if we think there is anything wrong. We could use this in our build file, fetching the page and failing the build if it returns an error. That means we
CHAPTER 1 2
DEVELOPING FOR THE WEB
have to catch the error, which implies that either the page generates an HTTP response of 500 or greater, or we parse the text received and look for an error string, maybe return XML text and have it parsed properly. We choose the simple route: generate an error response. In fact, we choose an even simpler route: throw an exception and let the container generate an error response. This may not be too portable, but we will address that when we encounter problems.
Listing 12.1 A simple tag to test server state against our requirements
package org.example.antbook.web.taglibs; import import import import javax.servlet.ServletContext; javax.servlet.jsp.JspException; javax.servlet.jsp.tagext.TagSupport; java.io.IOException;
/** * @jsp.tag name="happy" body-content="empty" */ public class HappyTag extends TagSupport { private boolean verbose=false; private boolean fail=false; /** * @jsp.attribute required="false" */ public void setVerbose(boolean verbose) { this.verbose=verbose; } /** * @jsp.attribute required="false" */ public void setFail(boolean fail) { this.fail=fail; } public int doStartTag() throws JspException { testServletVersion(); testFailureBehavior(); return SKIP_BODY; }
public void testServletVersion() throws JspException { ServletContext context = pageContext.getServletContext(); int major = context.getMajorVersion(); int minor = context.getMinorVersion(); if (major < 2 || (major == 2 && minor < 3)) { String text= "Servlet version (" + major + "." + minor + ") too old; 2.3+ required";
WORKING WITH TAG LIBRARIES
throw new JspException(text); } log("version =" + major + "." + minor); } public void testFailureBehavior() throws JspException { if(fail) { throw new JspException("Failure requested"); } } public void log(String message) throws JspException { if (verbose) { try { pageContext.getOut().println(message); } catch (IOException e) { throw new JspException(e); } } } }
Listing 12.1 shows our simple tag to make the test. The routine only contains one realistic test, that of verifying that the servlet API supported by the container is version 2.3 or later c. It also has a second test d that we can manually trigger; this lets us test the error handling. This test depends upon the state of the fail member variable, which can be set via an attribute in the tag. We have also written a log method, which logs test information if the verbose Boolean is set, and which is an attribute controllable in the tag. In traditional tag library development, we would need to write the XML taglib descriptor, listing the class name, its tag name, and tag information, such as the fact that this tag supported two optional attributes, fail and verbose. Here we are not doing traditional taglib development; we are using Ant and XDoclet. Our class-level Javadoc comment has a new tag, @jsp.tag, that names the tag b. There is a different Javadoc tag for each of the attributes setter methods, declaring that the method maps to an attribute of the tag, and that in each case these attributes are optional. This is all the information we need in order to generate the tag library, which the <webdoclet> task does for us. Like all the XDoclet tasks, this needs the external XDoclet library, a manual task declaration, and the classpath configured correctly. Our communal taskdefs.xml build file fragment addresses this initialization, so we just add the creation of the tag library descriptor to the process of generating all our web application descriptors, as shown in listing 12.2.
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