Tomcat中关于Servlet映射器Mapper的实现
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Tomcat中对于每个请求的所对于的资源（Host,Context,Wrapper）有一个映射器来实现的
Mapper中映射当前请求url所对应的Wrapper(Servlet)
private final void internalMapWrapper(ContextVersion contextVersion, CharChunk path, MappingData mappingData) throws Exception { int pathOffset = path.getOffset(); int pathEnd = path.getEnd(); int servletPath = pathOffset; boolean noServletPath = false; int length = contextVersion.path.length(); if (length != (pathEnd - pathOffset)) { servletPath = pathOffset + length; } else { noServletPath = true; path.append('/'); pathOffset = path.getOffset(); pathEnd = path.getEnd(); servletPath = pathOffset+length; } path.setOffset(servletPath); // Rule 1 -- Exact Match Wrapper[] exactWrappers = contextVersion.exactWrappers; internalMapExactWrapper(exactWrappers, path, mappingData); // Rule 2 -- Prefix Match boolean checkJspWelcomeFiles = false; Wrapper[] wildcardWrappers = contextVersion.wildcardWrappers; if (mappingData.wrapper == null) { internalMapWildcardWrapper(wildcardWrappers, contextVersion.nesting, path, mappingData); if (mappingData.wrapper != null && mappingData.jspWildCard) { char[] buf = path.getBuffer(); if (buf[pathEnd - 1] == '/') { /* * Path ending in '/' was mapped to JSP servlet based on * wildcard match (e.g., as specified in url-pattern of a * jsp-property-group. * Force the context's welcome files, which are interpreted * as JSP files (since they match the url-pattern), to be * considered. See Bugzilla 27664. */ mappingData.wrapper = null; checkJspWelcomeFiles = true; } else { // See Bugzilla 27704 mappingData.wrapperPath.setChars(buf, path.getStart(), path.getLength()); mappingData.pathInfo.recycle(); } } } if(mappingData.wrapper == null && noServletPath) { // The path is empty, redirect to "/" mappingData.redirectPath.setChars (path.getBuffer(), pathOffset, pathEnd-pathOffset); path.setEnd(pathEnd - 1); return; } // Rule 3 -- Extension Match Wrapper[] extensionWrappers = contextVersion.extensionWrappers; if (mappingData.wrapper == null && !checkJspWelcomeFiles) { internalMapExtensionWrapper(extensionWrappers, path, mappingData, true); } // Rule 4 -- Welcome resources processing for servlets if (mappingData.wrapper == null) { boolean checkWelcomeFiles = checkJspWelcomeFiles; if (!checkWelcomeFiles) { char[] buf = path.getBuffer(); checkWelcomeFiles = (buf[pathEnd - 1] == '/'); } if (checkWelcomeFiles) { for (int i = 0; (i < contextVersion.welcomeResources.length) && (mappingData.wrapper == null); i++) { path.setOffset(pathOffset); path.setEnd(pathEnd); path.append(contextVersion.welcomeResources[i], 0, contextVersion.welcomeResources[i].length()); path.setOffset(servletPath); // Rule 4a -- Welcome resources processing for exact macth internalMapExactWrapper(exactWrappers, path, mappingData); // Rule 4b -- Welcome resources processing for prefix match if (mappingData.wrapper == null) { internalMapWildcardWrapper (wildcardWrappers, contextVersion.nesting, path, mappingData); } // Rule 4c -- Welcome resources processing // for physical folder if (mappingData.wrapper == null && contextVersion.resources != null) { Object file = null; String pathStr = path.toString(); try { file = contextVersion.resources.lookup(pathStr); } catch(NamingException nex) { // Swallow not found, since this is normal } if (file != null && !(file instanceof DirContext) ) { internalMapExtensionWrapper(extensionWrappers, path, mappingData, true); if (mappingData.wrapper == null && contextVersion.defaultWrapper != null) { mappingData.wrapper = contextVersion.defaultWrapper.object; mappingData.requestPath.setChars (path.getBuffer(), path.getStart(), path.getLength()); mappingData.wrapperPath.setChars (path.getBuffer(), path.getStart(), path.getLength()); mappingData.requestPath.setString(pathStr); mappingData.wrapperPath.setString(pathStr); } } } } path.setOffset(servletPath); path.setEnd(pathEnd); } } /* welcome file processing - take 2 * Now that we have looked for welcome files with a physical * backing, now look for an extension mapping listed * but may not have a physical backing to it. This is for * the case of index.jsf, index.do, etc. * A watered down version of rule 4 */ if (mappingData.wrapper == null) { boolean checkWelcomeFiles = checkJspWelcomeFiles; if (!checkWelcomeFiles) { char[] buf = path.getBuffer(); checkWelcomeFiles = (buf[pathEnd - 1] == '/'); } if (checkWelcomeFiles) { for (int i = 0; (i < contextVersion.welcomeResources.length) && (mappingData.wrapper == null); i++) { path.setOffset(pathOffset); path.setEnd(pathEnd); path.append(contextVersion.welcomeResources[i], 0, contextVersion.welcomeResources[i].length()); path.setOffset(servletPath); internalMapExtensionWrapper(extensionWrappers, path, mappingData, false); } path.setOffset(servletPath); path.setEnd(pathEnd); } } // Rule 7 -- Default servlet if (mappingData.wrapper == null && !checkJspWelcomeFiles) { if (contextVersion.defaultWrapper != null) { mappingData.wrapper = contextVersion.defaultWrapper.object; mappingData.requestPath.setChars (path.getBuffer(), path.getStart(), path.getLength()); mappingData.wrapperPath.setChars (path.getBuffer(), path.getStart(), path.getLength()); } // Redirection to a folder char[] buf = path.getBuffer(); if (contextVersion.resources != null && buf[pathEnd -1 ] != '/') { Object file = null; String pathStr = path.toString(); try { file = contextVersion.resources.lookup(pathStr); } catch(NamingException nex) { // Swallow, since someone else handles the 404 } if (file != null && file instanceof DirContext) { // Note: this mutates the path: do not do any processing // after this (since we set the redirectPath, there // shouldn't be any) path.setOffset(pathOffset); path.append('/'); mappingData.redirectPath.setChars (path.getBuffer(), path.getStart(), path.getLength()); } else { mappingData.requestPath.setString(pathStr); mappingData.wrapperPath.setString(pathStr); } } } path.setOffset(pathOffset); path.setEnd(pathEnd); }// 再来看下Mapper中的信息是如何添加的，是在Connector启动时，会去启动MapperListener，会向Mapper注册已经启动的组件（Host,Context,Wrapper)
protected void addWrapper(ContextVersion context, String path, Object wrapper, boolean jspWildCard, boolean resourceOnly) { synchronized (context) { Wrapper newWrapper = new Wrapper(); newWrapper.object = wrapper; newWrapper.jspWildCard = jspWildCard; newWrapper.resourceOnly = resourceOnly; if (path.endsWith("/*")) { // Wildcard wrapper newWrapper.name = path.substring(0, path.length() - 2); Wrapper[] oldWrappers = context.wildcardWrappers; Wrapper[] newWrappers = new Wrapper[oldWrappers.length + 1]; if (insertMap(oldWrappers, newWrappers, newWrapper)) { context.wildcardWrappers = newWrappers; int slashCount = slashCount(newWrapper.name); if (slashCount > context.nesting) { context.nesting = slashCount; } } } else if (path.startsWith("*.")) { // Extension wrapper newWrapper.name = path.substring(2); Wrapper[] oldWrappers = context.extensionWrappers; Wrapper[] newWrappers = new Wrapper[oldWrappers.length + 1]; if (insertMap(oldWrappers, newWrappers, newWrapper)) { context.extensionWrappers = newWrappers; } } else if (path.equals("/")) { // Default wrapper newWrapper.name = ""; context.defaultWrapper = newWrapper; } else { // Exact wrapper newWrapper.name = path; Wrapper[] oldWrappers = context.exactWrappers; Wrapper[] newWrappers = new Wrapper[oldWrappers.length + 1]; if (insertMap(oldWrappers, newWrappers, newWrapper)) { context.exactWrappers = newWrappers; } } } }- Tomcat中关于Servlet映射器Mapper的实现
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