sitemesh PageFilter存在writeOriginal存在问题

页面经过sitemesh过滤处理，如果不存在对应的装饰器writeOriginal方法输出的结果很可能截短 原因是page.getContentLength()可能不正确,特别是页面编码为UTF-8时 修正后的类如下:

/* This software is published under the terms of the OpenSymphony Software
 * License version 1.1, of which a copy has been included with this
 * distribution in the LICENSE.txt file. */
package com.opensymphony.module.sitemesh.filter;

import com.opensymphony.module.sitemesh.*;
import com.opensymphony.module.sitemesh.util.Container;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * Main SiteMesh filter for applying Decorators to entire Pages.
 * 
 * @author Joe Walnes
 * @author Scott Farquhar
 * @version $Revision: 1.13 $
 */
public class PageFilter implements Filter, RequestConstants {
    protected FilterConfig filterConfig = null;

    protected Factory factory = null;

    /**
     * Main method of the Filter.
     * 
     * 

     * Checks if the Filter has been applied this request. If not, parses the
     * page and applies {@link com.opensymphony.module.sitemesh.Decorator} (if
     * found).
     */
    public final void doFilter(ServletRequest rq, ServletResponse rs,
            FilterChain chain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) rq;

        if (needDecorator(request)) {

            request.setAttribute(FILTER_APPLIED, Boolean.TRUE);

            // force creation of the session now because Tomcat 4 had problems
            // with
            // creating sessions after the response had been committed
            if (Container.get() == Container.TOMCAT) {
                request.getSession(true);
            }
            HttpServletResponse response = (HttpServletResponse) rs;

            // parse data into Page object (or continue as normal if Page not
            // parseable)
            Page page = parsePage(request, response, chain);

            if (page != null) {
                page.setRequest(request);

                Decorator decorator = factory.getDecoratorMapper()
                        .getDecorator(request, page);
                if (decorator != null && decorator.getPage() != null) {
                    applyDecorator(page, decorator, request, response);
                    page = null;
                    return;
                }

                // if we got here, an exception occured or the decorator was
                // null,
                // what we don't want is an exception printed to the user, so
                // we write the original page
                writeOriginal(request, response, page);
                page = null;
            }
        } else {
            // ensure that filter is only applied once per request
            chain.doFilter(rq, rs);
        }
    }

    /**
     * Test need decorator or not 

     * ensure that filter is only applied once per request
     * @param request
     * @return true,if need decorator; otherwise,false.
     */
    protected boolean needDecorator(HttpServletRequest request) {
        return !(request.getAttribute(FILTER_APPLIED) != null || factory
                .isPathExcluded(extractRequestPath(request)));
    }

    private String extractRequestPath(HttpServletRequest request) {
        String servletPath = request.getServletPath();
        String pathInfo = request.getPathInfo();
        String query = request.getQueryString();
        return (servletPath == null ? "" : servletPath)
                + (pathInfo == null ? "" : pathInfo)
                + (query == null ? "" : ("?" + query));
    }

    /**
     * Set FilterConfig, and get instance of
     * {@link com.opensymphony.module.sitemesh.DecoratorMapper}.
     */
    public void init(FilterConfig filterConfig) {
        if (filterConfig != null) {
            this.filterConfig = filterConfig;
            factory = Factory.getInstance(new Config(filterConfig));
        } else {
            destroy();
        }
    }

    /**
     * @deprecated Not needed in final version of Servlet 2.3 API - replaced by
     *             init().
     */
    // NOTE: SiteMesh doesn't work with Orion 1.5.2 without this method
    public FilterConfig getFilterConfig() {
        return filterConfig;
    }

    /**
     * @deprecated Not needed in final version of Servlet 2.3 API - replaced by
     *             init().
     */
    // NOTE: SiteMesh doesn't work with Orion 1.5.2 without this method
    public void setFilterConfig(FilterConfig filterConfig) {
        init(filterConfig);
    }

    /** Shutdown filter. */
    public void destroy() {
        factory = null;
    }

    /**
     * Continue in filter-chain, writing all content to buffer and parsing into
     * returned {@link com.opensymphony.module.sitemesh.Page} object. If
     * {@link com.opensymphony.module.sitemesh.Page} is not parseable, null is
     * returned.
     */
    protected Page parsePage(HttpServletRequest request,
            HttpServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        try {
            PageResponseWrapper pageResponse = new PageResponseWrapper(
                    response, factory);
            chain.doFilter(request, pageResponse);
            // check if another servlet or filter put a page object to the
            // request
            Page result = (Page) request.getAttribute(PAGE);
            if (result == null) {
                // parse the page
                result = pageResponse.getPage();
            }
            request.setAttribute(USING_STREAM, new Boolean(pageResponse
                    .isUsingStream()));
            return result;
        } catch (IllegalStateException e) {
            // weblogic throws an IllegalStateException when an error page is
            // served.
            // it's ok to ignore this, however for all other containers it
            // should be thrown
            // properly.
            if (Container.get() != Container.WEBLOGIC)
                throw e;
            else {
                e.printStackTrace();
            }
            return null;
        }
    }

    /**
     * Apply {@link com.opensymphony.module.sitemesh.Decorator} to
     * {@link com.opensymphony.module.sitemesh.Page} and write to the response.
     */
    protected void applyDecorator(Page page, Decorator decorator,
            HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {
            request.setAttribute(PAGE, page);
            ServletContext context = filterConfig.getServletContext();
            // see if the URI path (webapp) is set
            if (decorator.getURIPath() != null) {
                // in a security conscious environment, the servlet container
                // may return null for a given URL
                if (context.getContext(decorator.getURIPath()) != null) {
                    context = context.getContext(decorator.getURIPath());
                }
            }
            // get the dispatcher for the decorator
            RequestDispatcher dispatcher = context
                    .getRequestDispatcher(decorator.getPage());
            // create a wrapper around the response
            dispatcher.include(request, response);

            // set the headers specified as decorator init params
            while (decorator.getInitParameterNames().hasNext()) {
                String initParam = (String) decorator.getInitParameterNames()
                        .next();
                if (initParam.startsWith("header.")) {
                    response.setHeader(initParam.substring(initParam
                            .indexOf('.')), decorator
                            .getInitParameter(initParam));
                }
            }

            request.removeAttribute(PAGE);
        } catch (RuntimeException e) {
            // added a print message here because otherwise Tomcat swallows
            // the error and you never see it = bad!
            if (Container.get() == Container.TOMCAT)
                e.printStackTrace();

            throw e;
        }
    }

    /** Write the original page data to the response. */
    private void writeOriginal(HttpServletRequest request,
            HttpServletResponse response, Page page) throws IOException {
        // page.getContentLength() not right!
        // response.setContentLength(page.getContentLength());
        if (request.getAttribute(USING_STREAM).equals(Boolean.TRUE)) {
            PrintWriter writer = new PrintWriter(response.getOutputStream());
            page.writePage(writer);
            // flush writer to underlying outputStream
            writer.flush();
            response.getOutputStream().flush();
        } else {
            page.writePage(response.getWriter());
            response.getWriter().flush();
        }
    }
}

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