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When a web server calls a servlet, it loads the servlet s .class file (if it has not already been loaded) and calls one of the servlet s methods (doGet(), doPost(), etc.). The method takes two parameters, an HttpServletRequest (request) and an HttpServletResponse (response), and uses these two classes to send content back to the user/client (a web browser). Four methods are available to servlet developers for producing content: doHead(): Returns the headers identified by the request URL. This method is called by the servlet container to process a HEAD request. There may be many threads calling this method simultaneously: public void doHead(HttpServletRequest request, HttpServletResponse response) throws IOException { response.setContentLength(120); // set the content length response.setContentType("text/html"); // set the content type } service(): Provides an HTTP service: public void service(HttpServletRequest request, HttpServletResponse response) doGet(): Retrieves the resource identified by the request URL: public void doGet(HttpServletRequest request, HttpServletResponse response) doPost(): Sends data of unlimited length to the servlet container: public void doPost(HttpServletRequest request, HttpServletResponse response) service() is the generic servlet request method. If you write your servlet using service(), you can ignore the other options. The doGet() and doPost() methods are more specialized: they are used for handling HTTP GET and POST requests. If you place your application code in doGet(), your servlet will only respond to GET requests.

getTime(String columnName)

getTime(String columnName, Calendar cal)

page numbers. We then need to attach the click event to the span elements (that is, to the page numbers). Here we make all the images invisible, including the current one that is displayed if the user selects any of the page numbers. Finally, we retrieve the image from the $pic object (containing an array of images), depending on the value of the page number selected; we store it in variable next and display the image retrieved in the variable next. On execution of the jQuery code, initially the first image will be displayed with page numbers at its top, as shown in Figure 6-22.

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Java servlets have the following advantages over other server extension mechanisms: They typically run inside multithreaded servlet containers that can handle multiple requests concurrently (you have the option to run them single-threaded). They are generally much faster than CGI scripts because a different process model is used (the servlets are not created for every request; they are created once and can handle any number of requests). They use a standard API that is supported by many servlet containers. They have all the advantages of the Java programming language, including Java threads (Java language provides natural concurrent programming support) and ease of development and platform independence. They can access the large set of APIs available for the Java platform. They are extensible you can inherit all your functionality from the base classes made available to you. They are portable they run on all platforms (such as UNIX, Linux, Mac, Windows). They can be integrated into most servlet containers. They can run stand-alone in a servlet runner. Exception handling is built in. Security is built in. They are a single technology solution for applications. They can be interfaced to most other systems (such as JDBC).

Table 9-2. (Continued)

Figure 6-22. The first image, along with the page-number list above it On selecting the page number, the image of that page number will be displayed as shown in Figure 6-23.

getTimestamp(int columnIndex)

1. Use your favorite text editor (or any Java IDE) to create your Java servlet, SERVLET-NAME.java. 2. Using the Java compiler (javac), compile SERVLET-NAME.java (the output of this step is SERVLET-NAME.class). 3. Place the SERVLET-NAME.class file into your .../WEB-INF/classes directory (for details, see Tomcat s directory structure or your desired web application server). 4. Start the web/application server (this might load some or even all of the servlets depending on how the servlet container is configured). 5. A web/application server loads and initializes the servlet: when the first client requests a service from a servlet, then Java servlet (a .class file in this case, SERVLET-NAME.class) is loaded.

Retrieves the value of the designated column in the current row of this ResultSet object as a java.sql.Timestamp object in the Java programming language. Retrieves the value of the designated column in the current row of this ResultSet object as a java.sql.Timestamp object in the Java programming language. Retrieves the value of the designated column in the current row of this ResultSet object as a java.sql.Timestamp object. Retrieves the value of the designated column in the current row of this ResultSet object as a java.sql.Timestamp object in the Java programming language.

You want to display a few images on the web page within an invisible window, along with left and right arrow buttons below them. You want it to work so that when the left arrow button is pressed, the images shuffle toward the left side (making the images that were hidden scroll left), and when the right arrow button is selected, all the images scroll right to display any hidden images.

getTimestamp(int columnIndex, Calendar cal)

Note A servlet container starts the servlet .class files when the server starts or upon first request,

getTimestamp(String columnName)

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