org.apache.jasper.servlet.JspServlet Maven / Gradle / Ivy
/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jasper.servlet;
import javax.servlet.ServletContext;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.InputStream;
import java.io.IOException;
import java.util.Enumeration;
import org.apache.jasper.Constants;
import org.apache.jasper.Options;
import org.apache.jasper.EmbededServletOptions;
import org.apache.jasper.compiler.JspRuntimeContext;
import org.apache.jasper.logging.Logger;
import org.apache.jasper.logging.DefaultLogger;
/**
* The JSP engine (a.k.a Jasper).
*
* The servlet container is responsible for providing a
* URLClassLoader for the web application context Jasper
* is being used in. Jasper will try get the Tomcat
* ServletContext attribute for its ServletContext class
* loader, if that fails, it uses the parent class loader.
* In either case, it must be a URLClassLoader.
*
* @author Anil K. Vijendran
* @author Harish Prabandham
* @author Remy Maucherat
* @author Kin-man Chung
* @author Glenn Nielsen
*/
public class JspServlet extends HttpServlet {
private Logger logger;
private ServletContext context;
private ServletConfig config;
private Options options;
private JspRuntimeContext rctxt;
public void init(ServletConfig config)
throws ServletException {
super.init(config);
this.config = config;
this.context = config.getServletContext();
// Setup logging
logger = new DefaultLogger(this.context);
logger.setTimestamp("false");
logger.setVerbosityLevel(
config.getInitParameter("logVerbosityLevel"));
Constants.jasperLog.setVerbosityLevel(
config.getInitParameter("logVerbosityLevel"));
options = new EmbededServletOptions(config, context);
// Initialize the JSP Runtime Context
rctxt = new JspRuntimeContext(context,options);
logger.log(Constants.getString("jsp.message.scratch.dir.is",
new Object[] { options.getScratchDir().toString() } ),
Logger.INFORMATION );
logger.log(Constants.getString("jsp.message.dont.modify.servlets"),
Logger.INFORMATION);
}
/**
* Look for a precompilation request as described in
* Section 8.4.2 of the JSP 1.2 Specification. WARNING -
* we cannot use request.getParameter() for this, because
* that will trigger parsing all of the request parameters, and not give
* a servlet the opportunity to call
* request.setCharacterEncoding() first.
*
* @param request The servlet requset we are processing
*
* @exception ServletException if an invalid parameter value for the
* jsp_precompile parameter name is specified
*/
boolean preCompile(HttpServletRequest request) throws ServletException {
String queryString = request.getQueryString();
if (queryString == null) {
return (false);
}
int start = queryString.indexOf(Constants.PRECOMPILE);
if (start < 0) {
return (false);
}
queryString =
queryString.substring(start + Constants.PRECOMPILE.length());
if (queryString.length() == 0) {
return (true); // ?jsp_precompile
}
if (queryString.startsWith("&")) {
return (true); // ?jsp_precompile&foo=bar...
}
if (!queryString.startsWith("=")) {
return (false); // part of some other name or value
}
int limit = queryString.length();
int ampersand = queryString.indexOf("&");
if (ampersand > 0) {
limit = ampersand;
}
String value = queryString.substring(1, limit);
if (value.equals("true")) {
return (true); // ?jsp_precompile=true
} else if (value.equals("false")) {
return (true); // ?jsp_precompile=false
} else {
throw new ServletException("Cannot have request parameter " +
Constants.PRECOMPILE + " set to " +
value);
}
}
public void service (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
try {
String includeUri
= (String) request.getAttribute(Constants.INC_SERVLET_PATH);
String jspUri;
if (includeUri == null) {
jspUri = request.getServletPath();
} else {
jspUri = includeUri;
}
String jspFile = (String) request.getAttribute(Constants.JSP_FILE);
if (jspFile != null) {
jspUri = jspFile;
}
boolean precompile = preCompile(request);
if (logger.matchVerbosityLevel(Logger.INFORMATION))
{
logger.log("JspEngine --> "+jspUri);
logger.log("\t ServletPath: " +
request.getServletPath());
logger.log("\t PathInfo: " +
request.getPathInfo());
logger.log("\t RealPath: " +
context.getRealPath(jspUri));
logger.log("\t RequestURI: " +
request.getRequestURI());
logger.log("\t QueryString: " +
request.getQueryString());
logger.log("\t Request Params: ");
Enumeration e = request.getParameterNames();
while (e.hasMoreElements()) {
String name = (String) e.nextElement();
logger.log("\t\t " + name + " = " +
request.getParameter(name));
}
}
serviceJspFile(request, response, jspUri, null, precompile);
} catch (RuntimeException e) {
throw e;
} catch (ServletException e) {
throw e;
} catch (IOException e) {
throw e;
} catch (Throwable e) {
throw new ServletException(e);
}
}
public void destroy() {
logger.log("JspServlet.destroy()", Logger.INFORMATION);
rctxt.destroy();
}
// -------------------------------------------------------- Private Methods
private void serviceJspFile(HttpServletRequest request,
HttpServletResponse response, String jspUri,
Throwable exception, boolean precompile)
throws ServletException, IOException {
JspServletWrapper wrapper =
(JspServletWrapper) rctxt.getWrapper(jspUri);
if (wrapper == null) {
// First check if the requested JSP page exists, to avoid
// creating unnecessary directories and files.
InputStream resourceStream = context.getResourceAsStream(jspUri);
if (resourceStream == null) {
response.sendError(HttpServletResponse.SC_NOT_FOUND, jspUri);
return;
} else {
try {
resourceStream.close();
} catch(IOException e) { /* ignore */ }
}
boolean isErrorPage = exception != null;
synchronized(this) {
wrapper = (JspServletWrapper) rctxt.getWrapper(jspUri);
if (wrapper == null) {
wrapper = new JspServletWrapper(config, options, jspUri,
isErrorPage, rctxt);
rctxt.addWrapper(jspUri,wrapper);
}
}
}
wrapper.service(request, response, precompile);
}
}