jsptemplateprocessor.java

来自「resetful样式的ws样例,一种面向资源的webservices服务」· Java 代码 · 共 104 行

/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://jersey.dev.java.net/CDDL+GPL.html
 * or jersey/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at jersey/legal/LICENSE.txt.
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 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
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 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
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 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.jersey.impl.container.servlet;

import com.sun.jersey.api.container.ContainerException;
import com.sun.jersey.spi.template.TemplateProcessor;
import java.io.IOException;
import java.io.OutputStream;
import java.net.MalformedURLException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.core.Context;

/**
 * A JSP template processor.
 * 
 * @author [e-mail]
 */
public class JSPTemplateProcessor implements TemplateProcessor {
    @Context ServletContext servletContext;

    private final ThreadLocal<HttpServletRequest> requestInvoker;
    
    private final ThreadLocal<HttpServletResponse> responseInvoker;
    
    public JSPTemplateProcessor(ThreadLocal<HttpServletRequest> requestInvoker,
            ThreadLocal<HttpServletResponse> responseInvoker) {
        this.requestInvoker = requestInvoker;
        this.responseInvoker = responseInvoker;
    }
    
    public String resolve(String path) {
        if (servletContext == null)
            return null;
        
        if (!path.endsWith(".jsp"))
            path = path + ".jsp";

        try {
            if (servletContext.getResource(path) == null) {
                // TODO log
                return null;
            }
        } catch (MalformedURLException ex) {
            // TODO log
            return null;
        }
        
        return path;        
    }

    public void writeTo(String resolvedPath, Object model, OutputStream out) throws IOException {
        RequestDispatcher d = servletContext.getRequestDispatcher(resolvedPath);
        if (d == null) {
            throw new ContainerException("No request dispatcher for: " + resolvedPath);
        }
        
        d = new RequestDispatcherWrapper(d, model);
        
        try {
            d.forward(requestInvoker.get(), responseInvoker.get());
        } catch (Exception e) {
            e.printStackTrace();
            throw new ContainerException(e);
        }
    }
}