com.emaxcore.emaxdata.common.web.Servlets.java Source code

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Here is the source code for com.emaxcore.emaxdata.common.web.Servlets.java

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/**
 * Copyright (c) 2005-2012 springside.org.cn
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 */
package com.emaxcore.emaxdata.common.web;

import com.google.common.net.HttpHeaders;
import com.emaxcore.emaxdata.common.config.Global;
import com.emaxcore.emaxdata.common.utils.Encodes;
import com.emaxcore.emaxdata.common.utils.StringEmaxDataUtils;
import com.emaxcore.emaxdata.modules.sys.security.SystemAuthorizingRealm.Principal;
import com.emaxcore.emaxdata.modules.sys.utils.UserUtils;
import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.UnsupportedEncodingException;
import java.util.*;
import java.util.Map.Entry;

/**
 * HttpServlet.
 * @author calvin/thinkgem
 * @version 2014-8-19
 */
public class Servlets {

    /**
     * 
     */
    protected static Logger logger = LoggerFactory.getLogger(Servlets.class);

    // ?URL?
    private static final String URLSUFFIX = Global.getUrlSuffix();

    // ???
    private static final String[] staticFiles = StringEmaxDataUtils.split(Global.getConfig("web.staticFile"), ",");

    private Servlets() {

    }

    /**
     *  Header.
     */
    public static void setExpiresHeader(HttpServletResponse response, long expiresSeconds) {
        // Http 1.0 header, set a fix expires date.
        response.setDateHeader(HttpHeaders.EXPIRES, System.currentTimeMillis() + expiresSeconds * 1000);
        // Http 1.1 header, set a time after now.
        response.setHeader(HttpHeaders.CACHE_CONTROL, "private, max-age=" + expiresSeconds);
    }

    /**
     * ?Header.
     */
    public static void setNoCacheHeader(HttpServletResponse response) {
        // Http 1.0 header
        response.setDateHeader(HttpHeaders.EXPIRES, 1L);
        response.addHeader(HttpHeaders.PRAGMA, "no-cache");
        // Http 1.1 header
        response.setHeader(HttpHeaders.CACHE_CONTROL, "no-cache, no-store, max-age=0");
    }

    /**
     * LastModified Header.
     */
    public static void setLastModifiedHeader(HttpServletResponse response, long lastModifiedDate) {
        response.setDateHeader(HttpHeaders.LAST_MODIFIED, lastModifiedDate);
    }

    /**
     * Etag Header.
     */
    public static void setEtag(HttpServletResponse response, String etag) {
        response.setHeader(HttpHeaders.ETAG, etag);
    }

    /**
     * ??If-Modified-Since Header, ?.
     *
     * , checkIfModifyfalse ,304 not modify status.
     *
     * @param lastModified ?.
     */
    public static boolean checkIfModifiedSince(HttpServletRequest request, HttpServletResponse response,
            long lastModified) {
        long ifModifiedSince = request.getDateHeader(HttpHeaders.IF_MODIFIED_SINCE);
        if ((ifModifiedSince != -1) && (lastModified < ifModifiedSince + 1000)) {
            response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
            return false;
        }
        return true;
    }

    /**
     * ?? If-None-Match Header, Etag?.
     *
     * Etag, checkIfNoneMatchfalse, 304 not modify status.
     *
     * @param etag ETag.
     */
    public static boolean checkIfNoneMatchEtag(HttpServletRequest request, HttpServletResponse response,
            String etag) {
        String headerValue = request.getHeader(HttpHeaders.IF_NONE_MATCH);
        if (headerValue != null) {
            boolean conditionSatisfied = false;
            if (!"*".equals(headerValue)) {
                StringTokenizer commaTokenizer = new StringTokenizer(headerValue, ",");
                while (!conditionSatisfied && commaTokenizer.hasMoreTokens()) {
                    String currentToken = commaTokenizer.nextToken();
                    if (currentToken.trim().equals(etag)) {
                        conditionSatisfied = true;
                    }
                }
            } else {
                conditionSatisfied = true;
            }

            if (conditionSatisfied) {
                response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
                response.setHeader(HttpHeaders.ETAG, etag);
                return false;
            }
        }
        return true;
    }

    /**
     * ??Header.
     *
     * @param fileName ???.
     */
    public static void setFileDownloadHeader(HttpServletResponse response, String fileName) {
        try {
            // ???
            String encodedfileName = new String(fileName.getBytes(), "ISO8859-1");
            response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + encodedfileName + "\"");
        } catch (UnsupportedEncodingException e) {
            logger.warn(e + "");
            e.getMessage();
        }
    }

    /**
     * ???Request Parameters, copy from spring WebUtils.
     *
     * Parameter???.
     */
    @SuppressWarnings("rawtypes")
    public static Map<String, Object> getParametersStartingWith(ServletRequest request, String prefix) {
        Validate.notNull(request, "Request must not be null");
        Enumeration paramNames = request.getParameterNames();
        Map<String, Object> params = new TreeMap();
        String pre = prefix;
        if (pre == null) {
            pre = "";
        }
        while (paramNames != null && paramNames.hasMoreElements()) {
            String paramName = (String) paramNames.nextElement();
            if ("".equals(pre) || paramName.startsWith(pre)) {
                String unprefixed = paramName.substring(pre.length());
                String[] values = request.getParameterValues(paramName);
                if (values != null && values.length > 1) {
                    params.put(unprefixed, values);
                } else {
                    if (values != null && values.length == 1) {
                        params.put(unprefixed, values[0]);
                    }
                }
            }
        }
        return params;
    }

    /**
     * ?Parameters?Query StringParameter,paramter nameprefix.
     *
     */
    public static String encodeParameterStringWithPrefix(Map<String, Object> params, String prefix) {
        StringBuilder queryStringBuilder = new StringBuilder();

        String pre = prefix;
        if (pre == null) {
            pre = "";
        }
        Iterator<Entry<String, Object>> it = params.entrySet().iterator();
        while (it.hasNext()) {
            Entry<String, Object> entry = it.next();
            queryStringBuilder.append(pre).append(entry.getKey()).append("=").append(entry.getValue());
            if (it.hasNext()) {
                queryStringBuilder.append("&");
            }
        }
        return queryStringBuilder.toString();
    }

    /**
     * Http Basic? Header?.
     */
    public static String encodeHttpBasic(String userName, String password) {
        String encode = userName + ":" + password;
        return "Basic " + Encodes.encodeBase64(encode.getBytes());
    }

    /**
     * ?Ajax
     * @param request
     */
    public static boolean isAjaxRequest(HttpServletRequest request) {

        String accept = request.getHeader("accept");
        String xRequestedWith = request.getHeader("X-Requested-With");
        Principal principal = UserUtils.getPrincipal();

        // ?
        return ((accept != null && accept.indexOf("application/json") != -1)
                || (xRequestedWith != null && xRequestedWith.indexOf("XMLHttpRequest") != -1)
                || (principal != null && principal.isMobileLogin()));
    }

    /**
     * ??
     * @return
     */
    public static HttpServletRequest getRequest() {
        try {
            return ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
        } catch (Exception e) {
            logger.warn(e + "");
            return null;
        }
    }

    /**
     * URI???
     * @throws Exception
     */
    public static boolean isStaticFile(String uri) {
        if (staticFiles == null) {
            logger.error(
                    "app.properties??web.staticFile??\n#???\n"
                            + "web.staticFile=.css,.js,.png,.jpg,.gif,.jpeg,.bmp,.ico,.swf,.psd,.htc,.crx,.xpi,.exe,.ipa,.apk");
        }
        return (StringEmaxDataUtils.endsWithAny(uri, staticFiles)
                && !StringEmaxDataUtils.endsWithAny(uri, URLSUFFIX) && !StringEmaxDataUtils.endsWithAny(uri, ".jsp")
                && !StringEmaxDataUtils.endsWithAny(uri, ".java"));
    }
}