Java tutorial
/** * Copyright (c) 2005-2012 springside.org.cn * * Licensed under the Apache License, Version 2.0 (the "License"); */ package com.ziduye.base.web; import java.util.Enumeration; import java.util.Iterator; import java.util.Map; import java.util.Map.Entry; import java.util.StringTokenizer; import java.util.TreeMap; import java.util.regex.Matcher; import java.util.regex.Pattern; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.lang3.Validate; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes; import org.springframework.web.context.request.ServletWebRequest; import org.springside.modules.utils.Collections3; import org.springside.modules.utils.Encodes; import com.google.common.base.Charsets; import com.google.common.net.HttpHeaders; import com.ziduye.base.util.Global; import com.ziduye.base.util.StringUtils; public class Servlets { // -- --// public static final long ONE_YEAR_SECONDS = 60 * 60 * 24 * 365; // ??? private final static String[] staticFiles = StringUtils.split(Global.getConfig("web.staticFile"), ","); // ?URL? private final static String urlSuffix = Global.getUrlSuffix(); /** * 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(HttpServletRequest request, HttpServletResponse response, String fileName) { // ??? String encodedfileName = null; // ??firefox??,???+? encodedfileName = fileName.trim().replaceAll(" ", "_"); String agent = request.getHeader("User-Agent"); boolean isMSIE = (agent != null && agent.toUpperCase().indexOf("MSIE") != -1); if (isMSIE) { encodedfileName = Encodes.urlEncode(fileName); } else { encodedfileName = new String(fileName.getBytes(), Charsets.ISO_8859_1); } response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + encodedfileName + "\""); } /** * ???Request Parameters, copy from spring WebUtils. * * Parameter???. */ public static Map<String, Object> getParametersStartingWith(HttpServletRequest request, String prefix) { Validate.notNull(request, "Request must not be null"); Enumeration paramNames = request.getParameterNames(); Map<String, Object> params = new TreeMap<String, Object>(); if (prefix == null) { prefix = ""; } while ((paramNames != null) && paramNames.hasMoreElements()) { String paramName = (String) paramNames.nextElement(); if ("".equals(prefix) || paramName.startsWith(prefix)) { String unprefixed = paramName.substring(prefix.length()); String[] values = request.getParameterValues(paramName); if ((values == null) || (values.length == 0)) { // Do nothing, no values found at all. } else if (values.length > 1) { params.put(unprefixed, values); } else { params.put(unprefixed, values[0]); } } } return params; } /** * ?Parameters?Query StringParameter, paramter nameprefix. * * @see #getParametersStartingWith */ public static String encodeParameterStringWithPrefix(Map<String, Object> params, String prefix) { if (Collections3.isEmpty(params)) { return ""; } if (prefix == null) { prefix = ""; } StringBuilder queryStringBuilder = new StringBuilder(); Iterator<Entry<String, Object>> it = params.entrySet().iterator(); while (it.hasNext()) { Entry<String, Object> entry = it.next(); queryStringBuilder.append(prefix).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"); // ? return ((accept != null && accept.indexOf("application/json") != -1 || (xRequestedWith != null && xRequestedWith.indexOf("XMLHttpRequest") != -1))); } private final static String phoneReg = "\\b(ip(hone|od)|android|opera m(ob|in)i" + "|windows (phone|ce)|blackberry" + "|s(ymbian|eries60|amsung)|p(laybook|alm|rofile/midp" + "|laystation portable)|nokia|fennec|htc[-_]" + "|mobile|up.browser|[1-4][0-9]{2}x[1-4][0-9]{2})\\b"; private final static String tableReg = "\\b(ipad|tablet|(Nexus 7)|up.browser" + "|[1-4][0-9]{2}x[1-4][0-9]{2})\\b"; private static Pattern phonePat = Pattern.compile(phoneReg, Pattern.CASE_INSENSITIVE); private static Pattern tablePat = Pattern.compile(tableReg, Pattern.CASE_INSENSITIVE); /** * ? * @param request * @param uri * @return */ public static boolean isMobilRequest(HttpServletRequest request, String uri) { return isPhoneRequest(request, uri) || isTableRequest(request, uri); } /** * ? * @param request * @param uri * @return */ public static boolean isPhoneRequest(HttpServletRequest request, String uri) { String userAgent = request.getHeader("USER-AGENT").toLowerCase(); if (null == userAgent) { userAgent = ""; } Matcher matcherPhone = phonePat.matcher(userAgent); if (matcherPhone.find()) { return true; } else { return false; } } /** * ?? * @param request * @param uri * @return */ public static boolean isTableRequest(HttpServletRequest request, String uri) { String userAgent = request.getHeader("USER-AGENT").toLowerCase(); if (null == userAgent) { userAgent = ""; } Matcher matcherTable = tablePat.matcher(userAgent); if (matcherTable.find()) { return true; } else { return false; } } /** * URI??? * @throws Exception */ public static boolean isStaticFile(String uri) { if (staticFiles == null) { try { throw new Exception( "app.properties??web.staticFile??\n#???\n" + "web.staticFile=.css,.js,.png,.jpg,.gif,.jpeg,.bmp,.ico,.swf,.psd,.htc,.crx,.xpi,.exe,.ipa,.apk"); } catch (Exception e) { e.printStackTrace(); } } // if ((StringUtils.startsWith(uri, "/static/") || StringUtils.endsWithAny(uri, sfs)) // && !StringUtils.endsWithAny(uri, ".jsp") && !StringUtils.endsWithAny(uri, ".java")){ // return true; // } if (StringUtils.endsWithAny(uri, staticFiles) && !StringUtils.endsWithAny(uri, urlSuffix) && !StringUtils.endsWithAny(uri, ".jsp") && !StringUtils.endsWithAny(uri, ".java")) { return true; } return false; } /** * ?? * @return */ public static HttpServletRequest request() { try { return ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest(); } catch (Exception e) { return null; } } public static HttpServletResponse response() { try { return ((ServletWebRequest) RequestContextHolder.getRequestAttributes()).getResponse(); } catch (Exception e) { return null; } } }