struts2配置多个文件
在struts2中配置多个配置文件的方法很多，常见的几种为：
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1.由于struts2默认会加载class下的中的struts.xml文件，所以可以采用了include方法将其他的配置文件包含进来，其中include包含可以支持正则表达式。
<include file="struts/struts-*.xml"></include>
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2.第二种方法采用的是才web.xml中配置struts配置文件，具体如下:
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<filter>
? <filter-name>struts2</filter-name>
? <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
? <init-param>
?????? <param-name>config</param-name>
??????? <param-value>struts-default.xml,struts-plugin.xml,/WEB-INF/struts.xml,/WEB-INF/strtus/struts-conf/struts-*.xml</param-value>
???? </init-param>??
?</filter>
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3.第三种方法可以继承StrutsPrepareAndExecuteFilter重写init方法.
1.public class StrutsInitPrepareAndExecuteFilter extends
??StrutsPrepareAndExecuteFilter {
?public void init(FilterConfig filterConfig) throws ServletException {
??StrutsInitOperations init = new StrutsInitOperations();
??FilterHostConfig config = new FilterHostConfig(filterConfig);
??init.initLogging(config);
??Dispatcher dispatcher = init.initDispatcher(config);
??init.initStaticContentLoader(config, dispatcher);
??prepare = new PrepareOperations(filterConfig.getServletContext(),
????dispatcher);
??execute = new ExecuteOperations(filterConfig.getServletContext(),
????dispatcher);
??excludedPatterns = init.buildExcludedPatternsList(dispatcher);
??postInit(dispatcher, filterConfig);
??init.cleanup();
?}
}
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2.StrutsInitOperations继承InitOperations类中的createDispatcher方法
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public Dispatcher initDispatcher(HostConfig filterConfig) {
??Dispatcher dispatcher = createDispatcher(filterConfig);
??dispatcher.init();
??return dispatcher;
?}
?@SuppressWarnings({ "rawtypes", "unchecked" })
?private Dispatcher createDispatcher(HostConfig filterConfig) {
??Map params = new HashMap();
??String name;
??String value;
??for (Iterator e = filterConfig.getInitParameterNames(); e.hasNext(); params
????.put(name, value)) {
???name = (String) e.next();
???value = filterConfig.getInitParameter(name);
??}
??return new TestDispatcher(filterConfig.getServletContext(), params);
?}
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3.其中的TestDispatcher集成的是Dispatcher，我们可以在init方法中添加相应的加载xml方法
private void init_XmlConfigurations()
?{
??String realPath = this.servletContext.getRealPath("/");
??String configDir = this.initParams.get(“configDir”);
??if (configDir == null)
??{
???configDir = java.io.File.separator;
???configDir = realPath + configDir;
??}
??String configFilenamePattern = this.initParams
????.get("configFilenamePattern");
??if (configFilenamePattern == null)
??{
???configFilenamePattern = "struts*.xml";
??}
??this.getConfigurationManager().addConfigurationProvider(
????new TestConfigurationProvider(configDir, configFilenamePattern,
??????false, servletContext));
?}
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public void? init()
{
?? ....
?? init_XmlConfigurations();
?? ....
}
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4.TestConfigurationProvider 集成的是StrutsXmlConfigurationProvider，重写getConfigurationUrls方法
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public TestConfigurationProvider (String baseDir, String filenamePattern,
???boolean errorIfMissing, ServletContext servletContext)
?{
??super(filenamePattern, errorIfMissing, servletContext);
??if (baseDir != null)
??{
???this.baseDir = new File(baseDir);
??}
??this.filenamePattern = filenamePattern;
??this.servletContext = servletContext;
?}
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?@Override
?protected URL findInFileSystem(String fileName) throws IOException
?{
??URL url = null;
??File file = new File(fileName);
??if (!file.exists())
??{
???file = new File(baseDir, fileName);
??}
??if (file.exists())
??{
???try
???{
????url = file.toURL();
???}
???catch (MalformedURLException e)
???{
????throw new IOException("Unable to convert " + file + " to a URL");
???}
??}
??return url;
?}
?/*
?@Override
?protected Iterator<URL> getConfigurationUrls(String filenamePattern)
???throws IOException
?{
??List<URL> list = new ArrayList<URL>();
??URL url = null;
??if (this.baseDir != null && this.baseDir.exists()
????&& this.baseDir.isDirectory())
??{
???String[] struts2Files = baseDir.list(new TestStruts2FilenameFilter(
?????filenamePattern));
???for (String fileName : struts2Files)
???{
????url = findInFileSystem(fileName);
????if (url == null)
????{
?????return super.getConfigurationUrls(fileName);
????}
????else
????{
?????list.add(url);
????}
???}
??}
??return list.iterator();
?}
5.编写一个文件名称的匹配类TestStruts2FilenameFilter
?private String pattern;
?private List<Pattern> rules =new ArrayList();;
??public MostStruts2FilenameFilter(String pattern)
?{
??if (pattern == null || pattern.length() == 0)
??{
???this.pattern ="*.xml";
??}
??else
??{
???this.pattern = pattern;
??}
??String[] as = this.pattern.split("[ ,;]+");
??for (int i = 0; i < as.length; i++)
??{
???if (as[i].length() > 0)
???{
????String regx = as[i].replaceAll("\\*", "(\\\\S)*");
????rules.add(Pattern.compile(regx,
??????Pattern.CASE_INSENSITIVE));
???}
??}
?}
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?public boolean accept(File dir, String filename)
?{
??boolean flag = false;
??for (int i = 0; !flag && i < rules.size(); i++)
??{
???Pattern patternrule = (Pattern) rules.get(i);
???flag = patternrule.matcher(filename).matches();
??}
??return flag;
?}
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这样我们就完成了动态配置struts配置文件的,从而实现了struts配置多个文件。