打包资源，并通过过滤器进行读取，打包过滤器,import java.

打包资源，并通过过滤器进行读取，打包过滤器,import java.

import java.io.BufferedInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.URL;import java.net.URLConnection;import java.util.HashMap;import java.util.Map;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.io.IOUtils;import org.apache.commons.lang.BooleanUtils;import org.apache.commons.lang.StringUtils;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;public final class ResourceServlet extends HttpServlet {    /**     * 资源文件过滤器     */    private static final long serialVersionUID = 5372615627861275900L;    private static Log log = LogFactory.getLog(ResourceServlet.class);    private String encoding = null;    private boolean isdebug = false;    private static Map<String, String> mimeTypes;    private static Map<String, byte[]> rescache;    static {        mimeTypes = new HashMap<String, String>();        rescache = new HashMap<String, byte[]>();    }    /**     * 初始化资源     */    public void init() throws ServletException {        log.debug("初始化资源文件过滤器......");        encoding = getInitParameter("encoding");        isdebug = BooleanUtils.toBoolean(getInitParameter("isdebug"));        if (encoding == null) encoding = "utf-8";        mimeTypes.put("js", "text/javascript");        mimeTypes.put("css", "text/css");        mimeTypes.put("gif", "image/gif");        mimeTypes.put("jpg", "image/jpeg");        mimeTypes.put("jpeg", "image/jpeg");        mimeTypes.put("jpe", "image/jpeg");        mimeTypes.put("png", "image/png");        mimeTypes.put("html", "text");        mimeTypes.put("swf", "application/x-shockwave-flash");    }    public void destroy() {        super.destroy();    }    protected void doGet(HttpServletRequest request,            HttpServletResponse response) throws ServletException, IOException {        String theServletPath = request.getServletPath()                + request.getPathInfo();        String theExtension = StringUtils.right(theServletPath,                theServletPath.length() - theServletPath.lastIndexOf(".") - 1);        URL resource = ResourceServlet.class.getResource(theServletPath);        String mimeType = mimeTypes.get(theExtension.trim().toLowerCase());        if (resource != null && mimeType != null) {            URLConnection urlConnection = resource.openConnection();            response.setContentType(mimeType);            byte bytes[] = null;            if (!isdebug) {                bytes = (byte[]) rescache.get(theServletPath);                if (bytes == null) {                    synchronized (rescache) {                        bytes = getResourceBytesWithBuffer(theExtension,                                urlConnection);                        rescache.put(theServletPath, bytes);                    }                }            } else {                bytes = getResourceBytes(theExtension, urlConnection);            }            response.setContentLength(bytes.length);            try {                IOUtils.write(bytes, response.getOutputStream());            } catch (IOException e) {            }        } else {            response.sendError(404);        }    }    private byte[] getResourceBytesWithBuffer(String theExtension,            URLConnection urlConnection) {        java.io.InputStream inputStream = null;        byte bt[];        try {            inputStream = urlConnection.getInputStream();            ByteArrayOutputStream outStm = new ByteArrayOutputStream();            IOUtils.copy(new BufferedInputStream(inputStream), outStm);            outStm.flush();            byte bytes[] = outStm.toByteArray();            bt = bytes;            return bt;        } catch (IOException e) {            log.error(e.getMessage(), e);            throw new RuntimeException(e);        } finally {            IOUtils.closeQuietly(inputStream);        }    }    private byte[] getResourceBytes(String theExtension,            URLConnection urlConnection) {        InputStream is = null;        byte bt[];        try {            is = urlConnection.getInputStream();            bt = IOUtils.toByteArray(is);            return bt;        } catch (IOException e) {            log.error(e.getMessage(), e);            throw new RuntimeException(e);        } finally {            IOUtils.closeQuietly(is);        }    }    protected void doPost(HttpServletRequest req, HttpServletResponse resp)            throws ServletException, IOException {        doGet(req, resp);    }    // /**    // *    // * @param lastModifiedTimestamp 缓存list的时间戳    // * @return 是否大于缓存list的时间戳    // */    // public boolean checkNotModified(HttpServletRequest req,    // HttpServletResponse response,long lastModifiedTimestamp) {    // if (lastModifiedTimestamp >= 0 && !this.notModified &&    // (response == null || !response.containsHeader(HEADER_LAST_MODIFIED))) {    // long ifModifiedSince =    // req.getDateHeader(HEADER_IF_MODIFIED_SINCE);//取得客户端传上来的时间戳 if-modified    // this.notModified = (ifModifiedSince >= (lastModifiedTimestamp / 1000 *    // 1000));    // if (this.response != null) {    // if (this.notModified) {//大于    // response.setStatus(HttpServletResponse.SC_NOT_MODIFIED); //往响应流中状态设为305    // }    // else {    // response.setDateHeader(HEADER_LAST_MODIFIED, lastModifiedTimestamp);    // //把最新的缓存时间戳赋给响应流中的 Last-Modified    // }    // }    // }    // return this.notModified;    // }}//该片段来自于http://byrx.net