{"id":10158,"date":"2015-08-15T00:59:41","date_gmt":"2015-08-15T04:59:41","guid":{"rendered":"http:\/\/bangla.salearningschool.com\/?p=10158"},"modified":"2015-08-01T09:09:53","modified_gmt":"2015-08-01T13:09:53","slug":"simplerhellowww-java-servlet-that-uses-servletutilities-to-simplify-the-generation-of-the-doctype-and-head-part-of-the-servlet","status":"publish","type":"post","link":"http:\/\/bangla.sitestree.com\/?p=10158","title":{"rendered":"SimplerHelloWWW.java Servlet that uses ServletUtilities to simplify the generation of the DOCTYPE and HEAD part of the servlet."},"content":{"rendered":"<pre>SimplerHelloWWW.java\u00a0 Servlet that uses ServletUtilities\u00a0 to simplify the generation of the DOCTYPE and HEAD part of the servlet.\r\n\r\npackage cwp;\r\n\r\nimport java.io.*;\r\nimport javax.servlet.*;\r\nimport javax.servlet.http.*;\r\n\r\n\/** Simple servlet that generates HTML. This variation of\r\n\u00a0*\u00a0 HelloWWW uses the ServletUtilities utility class\r\n\u00a0*\u00a0 to generate the DOCTYPE, HEAD, and TITLE.\r\n\u00a0* \u00a0\r\n\r\n\r\n\u00a0*\u00a0 Taken from Core Web Programming Java 2 Edition\r\n\u00a0*\u00a0 from Prentice Hall and Sun Microsystems Press,\r\n\u00a0*\u00a0 .\r\n\u00a0*\u00a0 May be freely used or adapted.\r\n\u00a0*\/\r\n\r\npublic class SimplerHelloWWW extends HttpServlet {\r\n\u00a0 public void doGet(HttpServletRequest request,\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 HttpServletResponse response)\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 throws ServletException, IOException {\r\n\u00a0\u00a0\u00a0 response.setContentType(\"text\/html\");\r\n\u00a0\u00a0\u00a0 PrintWriter out = response.getWriter();\r\n\u00a0\u00a0\u00a0 out.println(ServletUtilities.headWithTitle(\"Hello WWW\") +\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \"\\n\" +\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \"\r\nHello WWW\r\n\\n\" +\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \"\");\r\n\u00a0 }\r\n}\r\n\r\n\r\nServlet Utilities\r\n\r\npackage cwp;\r\n\r\nimport javax.servlet.*;\r\nimport javax.servlet.http.*;\r\n\r\n\/** Some simple time savers. Note that most are static methods.\r\n\u00a0* \u00a0\r\n\r\n\r\n\u00a0*\u00a0 Taken from Core Web Programming Java 2 Edition\r\n\u00a0*\u00a0 from Prentice Hall and Sun Microsystems Press,\r\n\u00a0*\u00a0 May be freely used or adapted.\r\n\u00a0*\/\r\n\r\npublic class ServletUtilities {\r\n\u00a0 public static final String DOCTYPE =\r\n\u00a0\u00a0\u00a0 \"\";\r\n\r\n\u00a0 public static String headWithTitle(String title) {\r\n\u00a0\u00a0\u00a0 return(DOCTYPE + \"\\n\" +\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \"\\n\" +\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \"\\n\");\r\n\u00a0 }\r\n\r\n\u00a0 \/** Read a parameter with the specified name, convert it\r\n\u00a0\u00a0 *\u00a0 to an int, and return it. Return the designated default\r\n\u00a0\u00a0 *\u00a0 value if the parameter doesn't exist or if it is an\r\n\u00a0\u00a0 *\u00a0 illegal integer format.\r\n\u00a0 *\/\r\n\u00a0 \r\n\u00a0 public static int getIntParameter(HttpServletRequest request,\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 String paramName,\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 int defaultValue) {\r\n\u00a0\u00a0\u00a0 String paramString = request.getParameter(paramName);\r\n\u00a0\u00a0\u00a0 int paramValue;\r\n\u00a0\u00a0\u00a0 try {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 paramValue = Integer.parseInt(paramString);\r\n\u00a0\u00a0\u00a0 } catch(NumberFormatException nfe) { \/\/ null or bad format\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 paramValue = defaultValue;\r\n\u00a0\u00a0\u00a0 }\r\n\u00a0\u00a0\u00a0 return(paramValue);\r\n\u00a0 }\r\n\r\n\u00a0 \/** Given an array of Cookies, a name, and a default value,\r\n\u00a0\u00a0 *\u00a0 this method tries to find the value of the cookie with\r\n\u00a0\u00a0 *\u00a0 the given name. If there is no cookie matching the name\r\n\u00a0\u00a0 *\u00a0 in the array, then the default value is returned instead.\r\n\u00a0\u00a0 *\/\r\n\u00a0 \r\n\u00a0 public static String getCookieValue(Cookie[] cookies,\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 String cookieName,\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 String defaultValue) {\r\n\u00a0\u00a0\u00a0 if (cookies != null) {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 for(int i=0; i' with\r\n\u00a0\u00a0 *\u00a0 '&gt;', and (to handle cases that occur inside attribute\r\n\u00a0\u00a0 *\u00a0 values), all occurrences of double quotes with\r\n\u00a0\u00a0 *\u00a0 '\"' and all occurrences of '&amp;' with '&amp;'.\r\n\u00a0\u00a0 *\u00a0 Without such filtering, an arbitrary string\r\n\u00a0\u00a0 *\u00a0 could not safely be inserted in a Web page.\r\n\u00a0\u00a0 *\/\r\n\r\n\u00a0 public static String filter(String input) {\r\n\u00a0\u00a0\u00a0 StringBuffer filtered = new StringBuffer(input.length());\r\n\u00a0\u00a0\u00a0 char c;\r\n\u00a0\u00a0\u00a0 for(int i=0; i') {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 filtered.append(\"&gt;\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 } else if (c == '\"') {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 filtered.append(\"\"\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 } else if (c == '&amp;') {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 filtered.append(\"&amp;\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 } else {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 filtered.append(c);\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 }\r\n\u00a0\u00a0\u00a0 }\r\n\u00a0\u00a0\u00a0 return(filtered.toString());\r\n\u00a0 }\r\n}\r\n\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>SimplerHelloWWW.java\u00a0 Servlet that uses ServletUtilities\u00a0 to simplify the generation of the DOCTYPE and HEAD part of the servlet. package cwp; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; \/** Simple servlet that generates HTML. This variation of \u00a0*\u00a0 HelloWWW uses the ServletUtilities utility class \u00a0*\u00a0 to generate the DOCTYPE, HEAD, and TITLE. \u00a0* \u00a0 \u00a0*\u00a0 Taken from &hellip; <\/p>\n<p><a class=\"more-link btn\" href=\"http:\/\/bangla.sitestree.com\/?p=10158\">Continue reading<\/a><\/p>\n","protected":false},"author":130,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1417,1424],"tags":[706,308,1457,285],"class_list":["post-10158","post","type-post","status-publish","format-standard","hentry","category-code-programming-samples--","category-javaj2eej2me","tag-code","tag-java","tag-servlet","tag-285","item-wrap"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":26523,"url":"http:\/\/bangla.sitestree.com\/?p=26523","url_meta":{"origin":10158,"position":0},"title":"SimplerHelloWWW.java  Servlet that uses ServletUtilities  to simplify the generation of the DOCTYPE and HEAD part of the servlet. #Programming Code Examples #Java\/J2EE\/J2ME #Servlet","author":"Author-Check- Article-or-Video","date":"April 27, 2021","format":false,"excerpt":"SimplerHelloWWW.java Servlet that uses ServletUtilities to simplify the generation of the DOCTYPE and HEAD part of the servlet. package cwp; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; \/** Simple servlet that generates HTML. 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Uses the ServletUtilities  class to simplify the DOCTYPE and HEAD output. #Programming Code Examples #Java\/J2EE\/J2ME #Servlet","author":"Author-Check- Article-or-Video","date":"April 28, 2021","format":false,"excerpt":"ShowSession.java Servlet that uses session tracking to determine if the client is a repeat visitor. Uses the ServletUtilities class to simplify the DOCTYPE and HEAD output. package cwp; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.net.*; import java.util.*; \/** Simple example of session tracking. * * Taken from Core Web\u2026","rel":"","context":"In &quot;FromSitesTree.com&quot;","block_context":{"text":"FromSitesTree.com","link":"http:\/\/bangla.sitestree.com\/?cat=1917"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":10175,"url":"http:\/\/bangla.sitestree.com\/?p=10175","url_meta":{"origin":10158,"position":5},"title":"SetCookies.java Servlet that sets a few persistent and session cookies. 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