📄 servletutilities.java
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package coreservlets;import javax.servlet.*;import javax.servlet.http.*;/** Some simple time savers. Note that most are static methods. * <P> * Taken from Core Servlets and JavaServer Pages * from Prentice Hall and Sun Microsystems Press, * http://www.coreservlets.com/. * © 2000 Marty Hall; may be freely used or adapted. */public class ServletUtilities { public static final String DOCTYPE = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " + "Transitional//EN\">"; public static String headWithTitle(String title) { return(DOCTYPE + "\n" + "<HTML>\n" + "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n"); } /** Read a parameter with the specified name, convert it * to an int, and return it. Return the designated default * value if the parameter doesn't exist or if it is an * illegal integer format. */ public static int getIntParameter(HttpServletRequest request, String paramName, int defaultValue) { String paramString = request.getParameter(paramName); int paramValue; try { paramValue = Integer.parseInt(paramString); } catch(NumberFormatException nfe) { // null or bad format paramValue = defaultValue; } return(paramValue); } /** Given an array of Cookies, a name, and a default value, * this method tries to find the value of the cookie with * the given name. If there is no cookie matching the name * in the array, then the default value is returned instead. */ public static String getCookieValue(Cookie[] cookies, String cookieName, String defaultValue) { if (cookies != null) { for(int i=0; i<cookies.length; i++) { Cookie cookie = cookies[i]; if (cookieName.equals(cookie.getName())) return(cookie.getValue()); } } return(defaultValue); } /** Given an array of cookies and a name, this method tries * to find and return the cookie from the array that has * the given name. If there is no cookie matching the name * in the array, null is returned. */ public static Cookie getCookie(Cookie[] cookies, String cookieName) { if (cookies != null) { for(int i=0; i<cookies.length; i++) { Cookie cookie = cookies[i]; if (cookieName.equals(cookie.getName())) return(cookie); } } return(null); } /** Given a string, this method replaces all occurrences of * '<' with '<', all occurrences of '>' with * '>', and (to handle cases that occur inside attribute * values), all occurrences of double quotes with * '"' and all occurrences of '&' with '&'. * Without such filtering, an arbitrary string * could not safely be inserted in a Web page. */ public static String filter(String input) { StringBuffer filtered = new StringBuffer(input.length()); char c; for(int i=0; i<input.length(); i++) { c = input.charAt(i); if (c == '<') { filtered.append("<"); } else if (c == '>') { filtered.append(">"); } else if (c == '"') { filtered.append("""); } else if (c == '&') { filtered.append("&"); } else { filtered.append(c); } } return(filtered.toString()); }}⌨️ 快捷键说明
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