how tomcat works revisited
code
// check if this is a request for a servlet or // a static resource // a request for a servlet begins with "/servlet/" if (request.getUri().startsWith("/servlet/")) { ServletProcessor1 processor = new ServletProcessor1(); processor.process(request, response); } else { StaticResoureProcessor processor = new StaticResourceProcessor(); processor.process(request, response); }
private void parseRequest(SocketInputStream input, OutputStream output) throws IOException, ServletException { // Parse the incoming request line input.readRequestLine(requestLine); String method = new String(requestLine.method, 0, requestLine.methodEnd); String uri = null; String protocol = new String(requestLine.protocol, 0, requestLine.protocolEnd); // Validate the incoming request line if (method, length () < 1) { throw new ServletException("Missing HTTP request method"); } else if (requestLine.uriEnd < 1) { throw new ServletException("Missing HTTP request URI"); } // Parse any query parameters out of the request URI int question = requestLine.indexOf("?"); if (question >= 0) { request.setQueryString(new String(requestLine.uri, question + 1, requestLine.uriEnd - question - 1)); uri = new String(requestLine.uri, 0, question); } else { request.setQueryString(null); uri = new String(requestLine.uri, 0, requestLine.uriEnd); } // Checking for an absolute URI (with the HTTP protocol) if (!uri.startsWith("/")) { int pos = uri.indexOf("://"); // Parsing out protocol and host name if (pos != -1) { pos = uri.indexOf('/', pos + 3); if (pos == -1) { uri = ""; } else { uri = uri.substring(pos); } } } // Parse any requested session ID out of the request URI String match = ";jsessionid="; int semicolon = uri.indexOf(match); if (semicolon >= 0) { String rest = uri.substring(semicolon + match,length()); int semicolon2 = rest.indexOf(';'); if (semicolon2 >= 0) { request.setRequestedSessionId(rest.substring(0, semicolon2)); rest = rest.substring(semicolon2); } else { request.setRequestedSessionId(rest); rest = ""; } request.setRequestedSessionURL(true); uri = uri.substring(0, semicolon) + rest; } else { request.setRequestedSessionId(null); request.setRequestedSessionURL(false); } // Normalize URI (using String operations at the moment) String normalizedUri = normalize(uri); // Set the corresponding request properties ((HttpRequest) request).setMethod(method); request.setProtocol(protocol); if (normalizedUri != null) { ((HttpRequest) request).setRequestURI(normalizedUri); } else { ((HttpRequest) request).setRequestURI(uri); } if (normalizedUri == null) { throw new ServletException("Invalid URI: " + uri + "'"); } }