Publishers of technology books, eBooks, and videos for creative people

Home > Articles > Web Design & Development

  • Print
  • + Share This
Like this article? We recommend

Viewing Cached Pages in Java

For the Java example, let's delve a little deeper into the Google API with an application that presents the user with search results in a list, providing the ability to restrict the search between a set of dates. In addition, the user will be able to double-click any of the results and view a cached version of the page. This example uses another simple GUI (see Figure 3), this time written in Swing.

Figure 3

Figure 3 Our simple search GUI.

Figure 4 shows an example of a simple search.

Figure 4

Figure 4 A search and some results.

Now let's take a look at the code to run the search:

protected void doSearch()
String       searchString  = getSearchBox().getText();

int         startJulDate  = -1;
int         endJulDate   = -1;
DateFormat     dateFormat   = new SimpleDateFormat("MM/dd/yyyy");
Date        startDate    = null;
Date        endDate     = null;
Calendar      startCal    = null;
Calendar      endCal     = null;
int         month      = -1;
int         day       = -1;
int         year      = -1;

//Returns true if the checkbox is ticked
  //Attempt to parse the provided dates
  {  startDate = dateFormat.parse(getFromDateBox().getText());  }
  catch(Exception e)
  {  error("The start date entered (" + getFromDateBox().getText() +
        ") is not a valid date");  }
  {  endDate =  dateFormat.parse(getToDateBox().getText()); }
  catch(Exception e)
  {  error("The end date entered (" + getToDateBox().getText() +
        ") is not a valid date");  }

  //If we were able to parse the dates, append them onto the search
  if((startDate != null) && (endDate != null))
  //Google requires that all dates be in the Julian
  // form, i.e. days since 4713 B.C.
  startCal = new GregorianCalendar();
  endCal = new GregorianCalendar();
  startJulDate = getJulian(startCal.get(Calendar.YEAR),
  endJulDate = getJulian(endCal.get(Calendar.YEAR),
  //Use the "daterange:" keyword to
  searchString += " daterange:" + startJulDate + "-" + endJulDate;
  {  return; }

  //Run the search and save the results
  //Update the list
}  catch(Exception e)
  {  error("Exception from Google: " + e);  }


There's a lot going on here, including some logic to parse the dates and convert them to Julian format. A Julian counts the number of days since January 1, 4713 B.C. Converting a Gregorian date to Julian is somewhat complicated, but the formula is readily available online. Here's a method that does it:

public int getJulian(int year, int month, int date)
    int a, b, c, e, f;

    a = year / 100;
    b = a / 4;
    c = 2 - a + b;
    e = (int)(365.25 * (year + 4716));
    f = (int)(30.6001 * (month + 1));

    return (int)(c + date + e + f - 1524.5);

Once you have the numeric representation of the date, you can just concatenate daterange: startDate-endDate onto the end of your search string.

Let's go back to the doSearch() method. The last try/catch block is where much of the work happens:

  //Run the search and save the results
  //Update the list
}  catch(Exception e)
  {  error("Exception from Google: " + e);  }

The getSearch() method returns the global GoogleSearch instance, which encapsulates the Google API calls. The query string in this case is the text that was entered in the text box, plus the optional date qualification. We set the string in the GoogleSearch instance; we also store it in a global variable, as we may need it later. The doSearch() method performs the search, returning a GoogleSearchResult object that contains an array of GoogleSearchResultElements we can drop directly into our JList. By default, the JList displays an ugly textual representation of the GoogleSearchResultElement, but creating a custom ListCellRenderer will display the URL instead.

The final task is to store the index of the last GoogleSearchResultElement that's displayed, in this case 10. We'll need to start here to retrieve the next set of search results if the user clicks the >>> button. As mentioned earlier, you can only retrieve 10 search results at a time; retrieving the next 10 requires another search. This is the method that the >>> button calls when clicked:

protected void shiftRight()
      //Search with the last string
      //Indicate to start at the last result
    }  catch(Exception e)
      {  error("Exception from Google: " + e);  }

We're using the same search string here as before, but now we're specifying setStartResult() to be the value of the last index of the last search, so our new set of results will begin with the next result. We update the JList again with the new results, and set our new index. The shiftLeft() method looks very similar, subtracting 10 from the index before running the search.

If you're familiar with Swing, you know that its single-threaded nature can make your GUI stop responding when something is happening in the background. Since the Google searches generally take a second or two to complete, you'd do well to use something like XXX!!! to handle multithreading, to prevent your application from hanging while the search is in process. Additionally, a simple cache of GoogleSearchResultElements would make navigating through the list much faster.

  • + Share This
  • 🔖 Save To Your Account

Peachpit Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from Peachpit and its family of brands. I can unsubscribe at any time.


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about Peachpit products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information

To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.


Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites; develop new products and services; conduct educational research; and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.


If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information

Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.


This site is not directed to children under the age of 13.


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information

If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at and we will process the deletion of a user's account.


Users can always make an informed choice as to whether they should proceed with certain services offered by Adobe Press. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive:

Sale of Personal Information

Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to

Supplemental Privacy Statement for California Residents

California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure

Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact

Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice

We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020