Open Education – Page 267

Apr 27

ServletUtilities.java Utility class that, among other things, contains the static filter method that replaces special HTML characters with their HTML character entities. #Programming Code Examples #Java/J2EE/J2ME #Servlet

By Author-Check- Article-or-Video in FromSitesTree.com

ServletUtilities.java  Utility class that, among other things, contains the static filter  method that replaces special HTML characters with their HTML character entities. 

package cwp;

import javax.servlet.*;
import javax.servlet.http.*;

/** Some simple time savers. Note that most are static methods.
 *  
 *  Taken from Core Web Programming Java 2 Edition
 *  from Prentice Hall and Sun Microsystems Press,
 *  .
 *  May be freely used or adapted.
 */

public class ServletUtilities {
  public static final String DOCTYPE =
    "";

  public static String headWithTitle(String title) {
    return(DOCTYPE + "n" +
           "n" +
           "" + title + "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
   *  '>', 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 {
        filtered.append(c);
      }
    }
    return(filtered.toString());
  }
}

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10247
Categories:Programming Code Examples, Java/J2EE/J2ME, Servlet
Tags:Java/J2EE/J2MEServlet
Post Data:2017-01-02 16:04:28

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Apr 27

ThreeParams.java Servlet that reads and displays three request (form) parameters. Uses the ServletUtilities class. #Programming Code Examples #Java/J2EE/J2ME #Servlet

By Author-Check- Article-or-Video in FromSitesTree.com

ThreeParams.java  Servlet that reads and displays three request (form) parameters. Uses the ServletUtilities  class. 

package cwp;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

/** Simple servlet that reads three parameters from the
 *  form data.
 *  
 *  Taken from Core Web Programming Java 2 Edition
 *  from Prentice Hall and Sun Microsystems Press,
 *  .
 *  May be freely used or adapted.
 */

public class ThreeParams extends HttpServlet {
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    String title = "Reading Three Request Parameters";
    out.println(ServletUtilities.headWithTitle(title) +
                "n" +
                "
" + title + "n" +
                "n" +
                "  param1: "
                + request.getParameter("param1") + "n" +
                "  
param2: "
                + request.getParameter("param2") + "n" +
                "  
param3: "
                + request.getParameter("param3") + "n" +
                "n" +
                "");
  }
}

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10246
Categories:Programming Code Examples, Java/J2EE/J2ME, Servlet
Tags:Java/J2EE/J2MEServlet
Post Data:2017-01-02 16:04:28

Apr 27

ShowMessage.java Servlet that demonstrates the use of initialization parameters. #Programming Code Examples #Java/J2EE/J2ME #Servlet

By Author-Check- Article-or-Video in FromSitesTree.com

ShowMessage.java  Servlet that demonstrates the use of initialization parameters. Remember that, to use this servlet, you have to do three things:

    * Put the modified web.xml file in the WEB-INF directory.
    * Restart the server.
    * Use the registered servlet name (i.e., the URL http://host/servlet/ShowMsg), not the raw servlet name (i.e., the URL http://host/servlet/cwp.ShowMessage). 


package cwp;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

/** Example using servlet initialization. Here, the message
 *  to print and the number of times the message should be
 *  repeated is taken from the init parameters.
 *  
 *  Taken from Core Web Programming Java 2 Edition
 *  from Prentice Hall and Sun Microsystems Press,
 *  .
 *  May be freely used or adapted.
 */

public class ShowMessage extends HttpServlet {
  private String message;
  private String defaultMessage = "No message.";
  private int repeats = 1;

  public void init() throws ServletException {
    ServletConfig config = getServletConfig();
    message = config.getInitParameter("message");
    if (message == null) {
      message = defaultMessage;
    }
    try {
      String repeatString = config.getInitParameter("repeats");
      repeats = Integer.parseInt(repeatString);
    } catch(NumberFormatException nfe) {
      // NumberFormatException handles case where repeatString
      // is null *and* case where it is in an illegal format.
    }
  }

  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
        throws ServletException, IOException {
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    String title = "The ShowMessage Servlet";
    out.println(ServletUtilities.headWithTitle(title) +
                "n" +
                "
" + title + "");
    for(int i=0; i<repeats ; i++) {
      out.println("" + message + "
");
    }
    out.println("");
  }
}


web.xml



?

ShowMsg
cwp.ShowMessage
?

message
Shibboleth

?

repeats
5

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10245
Categories:Programming Code Examples, Java/J2EE/J2ME, Servlet
Tags:Java/J2EE/J2MEServlet
Post Data:2017-01-02 16:04:28

Apr 27

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

By Author-Check- Article-or-Video in FromSitesTree.com

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. This variation of
 *  HelloWWW uses the ServletUtilities utility class
 *  to generate the DOCTYPE, HEAD, and TITLE.
 *  
 *  Taken from Core Web Programming Java 2 Edition
 *  from Prentice Hall and Sun Microsystems Press,
 *  .
 *  May be freely used or adapted.
 */

public class SimplerHelloWWW extends HttpServlet {
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    out.println(ServletUtilities.headWithTitle("Hello WWW") +
                "n" +
                "
Hello WWWn" +
                "");
  }
}


Servlet Utilities

package cwp;

import javax.servlet.*;
import javax.servlet.http.*;

/** Some simple time savers. Note that most are static methods.
 *  

 *  Taken from Core Web Programming Java 2 Edition
 *  from Prentice Hall and Sun Microsystems Press,
 *  May be freely used or adapted.
 */

public class ServletUtilities {
  public static final String DOCTYPE =
    "";

  public static String headWithTitle(String title) {
    return(DOCTYPE + "n" +
           "n" +
           "" + title + "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
   *  '>', 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 {
        filtered.append(c);
      }
    }
    return(filtered.toString());
  }
}

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10244
Categories:Programming Code Examples, Java/J2EE/J2ME, Servlet
Tags:Java/J2EE/J2MEServlet
Post Data:2017-01-02 16:04:28

Apr 27

ServletUtilities.java Utility class that simplifies the output of the DOCTYPE and HEAD in servlets, among other things. Used by most remaining servlets in the chapter. #Programming Code Examples #Java/J2EE/J2ME #Servlet

By Author-Check- Article-or-Video in FromSitesTree.com

ServletUtilities.java  Utility class that simplifies the output of the DOCTYPE and HEAD  in servlets, among other things. Used by most remaining servlets in the chapter. 

package cwp;

import javax.servlet.*;
import javax.servlet.http.*;

/** Some simple time savers. Note that most are static methods.
 *  
 *  Taken from Core Web Programming Java 2 Edition
 *  from Prentice Hall and Sun Microsystems Press,
 *  .
 *  May be freely used or adapted.
 */

public class ServletUtilities {
  public static final String DOCTYPE =
    "";

  public static String headWithTitle(String title) {
    return(DOCTYPE + "n" +
           "n" +
           "" + title + "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
   *  '>', 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 {
        filtered.append(c);
      }
    }
    return(filtered.toString());
  }
}

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10243
Categories:Programming Code Examples, Java/J2EE/J2ME, Servlet
Tags:Java/J2EE/J2MEServlet
Post Data:2017-01-02 16:04:28

Apr 27

HelloWWW.java Servlet that generates HTML. This and all remaining servlets are in the cwp package and therefore should be installed in the cwp subdirectory. #Programming Code Examples #Java/J2EE/J2ME #Servlet

By Author-Check- Article-or-Video in FromSitesTree.com

HelloWWW.java  Servlet that generates HTML. This and all remaining servlets are in the cwp package and therefore should be installed in the cwp subdirectory.

package cwp;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

/** Simple servlet that generates HTML.
 *  
 *  Taken from Core Web Programming Java 2 Edition
 *  from Prentice Hall and Sun Microsystems Press,
 *  .
 *  May be freely used or adapted.
 */

public class HelloWWW extends HttpServlet {
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    String docType =
      "n";
    out.println(docType +
                "n" +
                "Hello WWWn" +
                "n" +
                "
Hello WWWn" +
                "");
  }
}

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10242
Categories:Programming Code Examples, Java/J2EE/J2ME, Servlet
Tags:Java/J2EE/J2MEServlet
Post Data:2017-01-02 16:04:28

Apr 27

HelloWorld.java Simple servlet that generates plain text. #Programming Code Examples #Java/J2EE/J2ME #Servlet

By Author-Check- Article-or-Video in FromSitesTree.com

HelloWorld.java  Simple servlet that generates plain text. 

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

/** Very simplistic servlet that generates plain text.
 *  
 *  Taken from Core Web Programming Java 2 Edition
 *  from Prentice Hall and Sun Microsystems Press,
 *  .
 *  May be freely used or adapted.
 */

public class HelloWorld extends HttpServlet {
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {
    PrintWriter out = response.getWriter();
    out.println("Hello World");
  }
}

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10241
Categories:Programming Code Examples, Java/J2EE/J2ME, Servlet
Tags:Java/J2EE/J2MEServlet
Post Data:2017-01-02 16:04:28

Apr 27

ServletTemplate.java Starting point for servlets. #Programming Code Examples #Java/J2EE/J2ME #Servlet

By Author-Check- Article-or-Video in FromSitesTree.com

ServletTemplate.java Starting point for servlets. 


import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

/** Servlet template.
 *  
 *  Taken from Core Web Programming Java 2 Edition
 *  from Prentice Hall and Sun Microsystems Press,
 *  .
 *  May be freely used or adapted.
 */

public class ServletTemplate extends HttpServlet {
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {

    // Use "request" to read incoming HTTP headers
    // (e.g., cookies) and query data from HTML forms.

    // Use "response" to specify the HTTP response status
    // code and headers (e.g. the content type, cookies).

    PrintWriter out = response.getWriter();
    // Use "out" to send content to browser
  }
}

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10240
Categories:Programming Code Examples, Java/J2EE/J2ME, Servlet
Tags:Java/J2EE/J2MEServlet
Post Data:2017-01-02 16:04:28

Apr 26

Print three-dimensional valarray line-by-line #Programming Code Examples #Java/J2EE/J2ME #Valarray

By Author-Check- Article-or-Video in FromSitesTree.com

/* The following code example is taken from the book
 * "The C++ Standard Library - A Tutorial and Reference"
 * by Nicolai M. Josuttis, Addison-Wesley, 1999
 *
 * (C) Copyright Nicolai M. Josuttis 1999.
 * Permission to copy, use, modify, sell and distribute this software
 * is granted provided this copyright notice appears in all copies.
 * This software is provided "as is" without express or implied
 * warranty, and with no claim as to its suitability for any purpose.
 */
#include <iostream>
#include <valarray>
using namespace std;

// print three-dimensional valarray line-by-line
template<class T>
void printValarray3D (const valarray<T>& va, int dim1, int dim2)
{
    for (int i=0; i<va.size()/(dim1*dim2); ++i) {
        for (int j=0; j<dim2; ++j) {
            for (int k=0; k<dim1; ++k) {
                cout << va[i*dim1*dim2+j*dim1+k] << ' ';
            }
            cout << 'n';
        }
        cout << 'n';
    }
    cout << endl;
}

int main()
{
    /* valarray with 24 elements
     * - two groups
     * - four rows
     * - three columns
     */
    valarray<double> va(24);

    // fill valarray with values
    for (int i=0; i<24; i++) {
        va[i] = i;
    }

    // print valarray
    printValarray3D (va, 3, 4);

    // we need two two-dimensional subsets of three times 3 values
    // in two 12-element arrays
    size_t lengthvalues[] = {  2, 3 };
    size_t stridevalues[] = { 12, 3 };
    valarray<size_t> length(lengthvalues,2);
    valarray<size_t> stride(stridevalues,2);

    // assign the second column of the first three rows
    // to the first column of the first three rows
    va[gslice(0,length,stride)]
        = valarray<double>(va[gslice(1,length,stride)]);

    // add and assign the third of the first three rows
    // to the first of the first three rows
    va[gslice(0,length,stride)]
        += valarray<double>(va[gslice(2,length,stride)]);

    // print valarray
    printValarray3D (va, 3, 4);
}

/*
0 1 2
3 4 5
6 7 8
9 10 11

12 13 14
15 16 17
18 19 20
21 22 23


3 1 2
9 4 5
15 7 8
9 10 11

27 13 14
33 16 17
39 19 20
21 22 23



 */

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10191
Categories:Programming Code Examples, Java/J2EE/J2ME, Valarray
Tags:Java/J2EE/J2MEValarray
Post Data:2017-01-02 16:04:23

Apr 26

Driver template to create and start a Thread object. #Programming Code Examples #Javascript #Java Threads

By Author-Check- Article-or-Video in FromSitesTree.com

/** Taken from Core Web Programming from 
 *  Prentice Hall and Sun Microsystems Press,
  *  © 2001 Marty Hall and Larry Brown;
 *  may be freely used or adapted.
 */

public class DriverClass extends SomeClass {
  ...
  public void startAThread() {
    // Create a Thread object.
    ThreadClass thread = new ThreadClass();
    // Start it in a separate process.
    thread.start();
    ...
  }
}

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10183
Categories:Programming Code Examples, Javascript, Java Threads
Tags:JavascriptJava Threads
Post Data:2017-01-02 16:04:23

Understanding the Hierarchical DNS System: Domains, Subdomains, and FQDNs

DNS Hierarchy with a Domain Name

How DNS Names Work: Example with chat.811tech.ca

What Does “Namespace” Mean in DNS?

How a DNS Request Travels Across Networks

ServletUtilities.java Utility class that, among other things, contains the static filter method that replaces special HTML characters with their HTML character entities. #Programming Code Examples #Java/J2EE/J2ME #Servlet

ThreeParams.java Servlet that reads and displays three request (form) parameters. Uses the ServletUtilities class. #Programming Code Examples #Java/J2EE/J2ME #Servlet

" + title + "

ShowMessage.java Servlet that demonstrates the use of initialization parameters. #Programming Code Examples #Java/J2EE/J2ME #Servlet

" + 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

Hello WWW

ServletUtilities.java Utility class that simplifies the output of the DOCTYPE and HEAD in servlets, among other things. Used by most remaining servlets in the chapter. #Programming Code Examples #Java/J2EE/J2ME #Servlet

HelloWWW.java Servlet that generates HTML. This and all remaining servlets are in the cwp package and therefore should be installed in the cwp subdirectory. #Programming Code Examples #Java/J2EE/J2ME #Servlet

Hello WWW

HelloWorld.java Simple servlet that generates plain text. #Programming Code Examples #Java/J2EE/J2ME #Servlet

ServletTemplate.java Starting point for servlets. #Programming Code Examples #Java/J2EE/J2ME #Servlet

Print three-dimensional valarray line-by-line #Programming Code Examples #Java/J2EE/J2ME #Valarray

Driver template to create and start a Thread object. #Programming Code Examples #Javascript #Java Threads

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Understanding the Hierarchical DNS System: Domains, Subdomains, and FQDNs

DNS Hierarchy with a Domain Name

How DNS Names Work: Example with chat.811tech.ca

What Does “Namespace” Mean in DNS?

How a DNS Request Travels Across Networks

Explain DNS