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1 CS 342 Software Engineering Lab: Weblogic server (w/ database pools) setup, Servlet, XMLC warming up Professor: David Wolber TA: Samson Yingfeng Su Setup Weblogic 6.x server with database pools In order to access databases using Weblogic Pool APIs, we need to first setup pools on Weblogic server. A database pool is a wrapper that wraps any JDBC compatible database. After wrapping it as pools, programmers can use pool name to access the database. Thus the original JDBC driver is hidden. It allows the programmer to switch database products without changing their code. It also provides TCP/IP connectivity for file-based JDBC drivers. In our project, we can use Weblogic pool to wrap the Cloudscape database system. Actually, you will see that you can change your database system easily later by modifying the Weblogic configuration files only. For example, when your program grows larger and you think Cloudscape is not powerful enough to handle all the data, you can switch to Oracle, without changing your application/servlet. In this section I ll show how to setup a Weblogic pool. In the next sections I ll list a simple servlet that retrieves the data from the pool and display it in HTML format (on the client s browser). The following steps assume that you are using Weblogic server 6.x. The configuration for 5.x is slightly different. 1. Because Cloudscape is a file-based database system, you need to have a directory that contains your database files. To simplify your work, I have put a sample database in the public directory. You can unzip it to your local machine. Let s say, we unzip it to D:\. Now you have D:\storedb as your database directory. 2. Use a text editor to open the Weblogic configuration file (more precisely, the configuration file of the default domain. A Weblogic server can handle more than one domains): D:\bea\wlserver6.x\config\mydomain\config.xml Add the following as a sub-node of the <Domain> node: <JDBCConnectionPool CapacityIncrement="1" DriverName="COM.cloudscape.core.JDBCDriver" InitialCapacity="1" MaxCapacity="500" Name="storePool" Properties="user=none;password=none;server=none" RefreshMinutes="0" Targets="myserver" TestConnectionsOnRelease="false" TestConnectionsOnReserve="false" URL="jdbc:cloudscape:d:/storedb" /> You can see that the JDBC driver name is specified here. That s why pool accesses can be JDBC driver independent. There are 2 properties you should pay attention to: Name and URL. The Name will be the pool name you want to use in your application/servlet later. Here we use storepool. The URL might have different formats for different JDBC drivers. For Cloudscape, it s jdbc:cloudscape: followed by the database directory name (which we setup in the previous step). Even in Windows, you can still use forward-slash / in path. 3. The pool should be added now. You can start Weblogic server and see if there s any error message. Write a Hello World servlet and register it In order to write a servlet that runs on Weblogic server, the following steps are required: 1. Write your servlet code in a Java source file. It should be a subclass of HttpServlet. The following is a simple servlet that prints Hello World on the client s browser. Here I use labwl as the package name. 1

2 package labwl; import javax.servlet.*; import javax.servlet.http.*; import java.io.*; import java.util.*; public class HelloWorldServlet extends HttpServlet { public void doget(httpservletrequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setcontenttype("text/html; charset=windows-1252"); PrintWriter out = resp.getwriter(); out.println("<h1>hello World</h1>"); 2. This Java source file should be stored in the following directory: D:\bea\wlserver6.x\config\mydomain\applications\DefaultWebApp_myserver \WEB-INF\classes\labwl Please be aware that the name of the last level directory must be the same with the package name. 3. Get into the above directory, compile your program using javac: javac *.java 4. Use a text editor to open the web application configuration file: D:\bea\wlserver6.x\config\mydomain\applications\DefaultWebApp_myserver\WEB-INF\web.xml and add the following section as sub-nodes of the <web-app> node: <servlet> <servlet-name>helloworld</servlet-name> <servlet-class>labwl.helloworldservlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>helloworld</servlet-name> <url-pattern>/helloworld</url-pattern> </servlet-mapping> Servlet-name must be the same in <servlet> and <servlet-mapping> nodes. Servlet-class should be the fully-qualified class name of your servlet class. Url-pattern is what client should type after the site name in the browser s URL text box. 5. Start Weblogic server, open a web browser such as IE or Netscape, access the following address: You should see Hello World. 6. After you register a servlet, you must restart Weblogic server. If you only modify the servlet and re-compile it, you don t need to restart Weblogic server. Just refresh the browser and the new output should be seen. (sometimes you need to restart the browser, especially in programming with HTTP Session). 2

3 A simple servlet that accesses Weblogic pool In the previous sections we have learned how to setup a pool and how to register a servlet. Now we try to write a servlet that retrieves data from the database pool. A pool is basically equivalent with a database. It can hold multiple tables. You can use standard SQL statements to get data from some tables, or even create new tables. In the storedb, there are some sample tables in it. Here s a servlet that retrieves everything in the books table, and display it in HTML format on the client s browser. package labwl; import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; import java.io.*; import java.util.*; public class ListBooksServlet extends HttpServlet { public void doget(httpservletrequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setcontenttype("text/html; charset=windows-1252"); PrintWriter out = resp.getwriter(); Connection conn = null; // load the weblogic pool driver, connect to pool try{ Class.forName("weblogic.jdbc.pool.Driver").newInstance(); conn = DriverManager.getConnection("jdbc:weblogic:pool:storePool"); catch(exception e) { System.out.println(e); // connection is ready. we start to get data // usually, all db operations require try{catch try{ // statement is returned from connection, and used for queries Statement stmt = conn.createstatement(); // this is the most important thing: SQL query ResultSet rs = stmt.executequery("select * from books"); out.println("<table border=1>"); // read one row from the query result at a time, // until there s no more while(rs.next()) { out.print("<tr>"); out.print("<td>" + rs.getstring(1) + "</td>"); out.print("<td>" + rs.getstring(2) + "</td>"); out.print("<td>" + rs.getstring(3) + "</td>"); out.print("<td>" + rs.getstring(4) + "</td>"); out.println("</tr>"); out.println("</table>"); 3

4 catch(exception e) { System.out.println(e); To register it with Weblogic server, open web.xml file and add the following node: <servlet> <servlet-name>listbooks</servlet-name> <servlet-class>labwl.listbooksservlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>listbooks</servlet-name> <url-pattern>/listbooks</url-pattern> </servlet-mapping> Try to access it from a browser, using URL XMLC basis XMLC is a tool to convert HTML from plain text view to a tree structure view. Thus some operations (such as insert node, remove node, clone node) can be used to change the structure of the HTML. After we make changes to the HTML tree structure, we can convert it back to plain text and put it on the client browser. We call the original HTML file the HTML template. Why do we need XMLC? If you use servlet to write complex web sites, you ll soon find that the out.println() statements will drive you mad. You can not use any WYSIWYG editor to design the presentation of the site. Every line of HTML is from out.println(). Things can be even worse. Suppose two people are working on the same site. One of them is an artist who really knows how to use HTML to make a site beautiful, but knows very little about programming or database. The other one is a programmer. He knows how to efficiently retrieve data from the database, but lacks the sense of how to make it beautiful when it is published on the site. Thus, they need to cooperate. If the programmer writes the above book list program, and he/she has the following code in the servlet file: while(rs.next()) { out.print("<tr>"); out.print("<td>" + rs.getstring(1) + "</td>"); out.print("<td>" + rs.getstring(2) + "</td>"); out.print("<td>" + rs.getstring(3) + "</td>"); out.print("<td>" + rs.getstring(4) + "</td>"); out.println("</tr>"); Now, the artist thinks this is ugly and would like to change the font color of the second column to blue. We all know that the modification should be: out.print("<td><font color=blue>" + rs.getstring(2) + "</font></td>"); But here comes the problem. Don t forget: the artist knows very little about programming. The above modification requires the artist to find the loop that generates the data table, then change it without messing up the syntax. In a more complicated example, the artist might even corrupt the programmer s work. This is a traditional problem in server side development. People are always trying to find a way to separate the work of the artist and the programmer. There are many solutions today. Most of them are based on templates. Thus these solutions are called template engine. XMLC is one of the template engine solutions. The advantage of XMLC is that it can break the web site development into 2 parts: the presentation and the backend business logic. They are loosely coupled so that the artist can focus on presentation, without knowing too much about programming; and the programmer can focus on logic, without worrying about how to make the output beautiful. The following step-by-step guide demonstrates the basic idea of XMLC. We still use the book list as the example. 4

5 1. In the labwl directory (where we put the servlet files), create an HTML document, name it as BookListTemplate.html. The file looks like: <html> <body> <h1 id=title>title Goes Here</h1> <table border=1> <tr> <th>id</th><th>book Name</th><th>Price</th><th>Inv</th></tr> <tr id=templaterow> <td id=bookisbn>column1</td> <td id=bookname>column2</td> <td id=bookprice>column3</td> <td id=bookinv>column4</td> </tr> </table> </body> </html> This looks like a simple HTML file. No surprise at all. The only thing to mention is the id field of some tags. I call these tags named tree nodes. Later I can get handles to these nodes from the servlet. 2. Open a console window, run bash (should have been setup on our lab machines). Enter the labwl directory, then type the following command: xmlc -keep -dump -methods -class labwl.booklisttemplate BookListTemplate.htm From the output, you should see a tree-like output. At the end of the output, you will also see some function prototypes, such as public void settextbookname(string text). We will use these methods to change the template later. Now the HTML is converted from plain text to the tree. We can manipulate this tree in our servlet. 3. Create a servlet XMLCListBooksServlet in the labwl directory: package labwl; import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; import java.io.*; import java.util.*; import org.w3c.dom.*; import org.enhydra.xml.xmlc.xmlcerror; import org.enhydra.xml.xmlc.xmlcutil; import org.enhydra.xml.xmlc.dom.xmlcdomfactory; public class XMLCListBooksServlet extends HttpServlet { public void doget(httpservletrequest req, HttpServletResponse resp) throws ServletException, IOException { Connection conn = null; resp.setcontenttype("text/html; charset=windows-1252"); PrintWriter out = resp.getwriter(); // get a tree-structural template of book list BookListTemplate template = new BookListTemplate(); 5

6 // change "Title goes here" to "Book list" in template template.settexttitle("book List"); // get the template <tr> element Node templaterow = template.getelementtemplaterow(); // load the weblogic pool driver try{ Class.forName("weblogic.jdbc.pool.Driver").newInstance(); conn = DriverManager.getConnection("jdbc:weblogic:pool:storePool"); catch(exception e) { System.out.println(e); try{ // select books from db Statement stmt = conn.createstatement(); ResultSet rs = stmt.executequery("select * from books"); while(rs.next()) { // fill real data into the template row template.settextbookisbn(rs.getstring(1)); template.settextbookname(rs.getstring(2)); template.settextbookprice(rs.getstring(3)); template.settextbookinv(rs.getstring(4)); // fork the template row templaterow.getparentnode().insertbefore (templaterow.clonenode(true), templaterow); // think: what if we don t remove the template row itself? templaterow.getparentnode().removechild(templaterow); catch(exception e) { e.printstacktrace(); // convert the tree-structure back to plain text, // send to client browser out.println(template.todocument()); Of course, you need to register it in web.xml file: <servlet> <servlet-name>xmlclistbooks</servlet-name> <servlet-class>labwl.xmlclistbooksservlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>xmlclistbooks</servlet-name> <url-pattern>/xmlclistbooks</url-pattern> </servlet-mapping> Now, try URL: 4. Let s go back to the artist-programmer problem we mentioned earlier. How can XMLC help in this case? If the artist wants to change the font color of the 2nd column to blue, he/she only needs to modify the BookListTemplate.html file, and re-compile it with XMLC. When the client refreshes his browser, the new color will appear. This can be done without even notifying the programmer. 6

7 Deal with user input in servlet When we say dynamic contents, usually we mean that the page is generated based on the data from database, as well as user input. HTTP 1.1 protocol has defined a way to pass parameters among pages/servlets. Let s write a simple example to show how it works. We want to modify the HelloWorldServlet so that it not only shows Hello World, but also shows the user name, i.e., Hello World. Your name is John.. Here John is input by the user from the previous page (the page that calls the servlet). In HTML, the <FORM> element is used to define parameters that will be sent to the destination page/servlet. The <FORM> tag has two important properties: action and method. Action means where the parameters will be sent to. Method determines how the parameters will be sent. Available methods include (but not only) GET and POST. Simply speaking, in GET mode, parameters are encoded into the URL, so it s suitable for simple and short parameters. POST is often used to deliver large block of data. In our project, both of them are OK. If you use the GET method in the caller page, there must be a doget(...) function in your servlet (when the user types the URL in the browser and presses enter, actually a GET request is generated. That is why we use doget(...) in our previous examples). If you use the POST method, dopost(...) should be used. If you don t care how these parameters are accepted, you can use service(...) function to serve both modes. Inside the <FORM>...</FORM> element, we can define each parameter. Usually there is at least one submit button. When the user clicks on the submit button, that means the data input is finished and the destination page (the action field) will be called to deal with it. First, write a simple HTML file: <html> <form action=/helloworldservlet method=get> <p>please enter your name: <input type=text name=visitor_name> <p><input type=submit value="say Hello"> </form> </html> Of course you can also have this page generated by servlet. But there is no dynamic contents in this form, so using a simple static HTML file will be OK. Let s name this file as welcome.htm, and put it into the following directory: D:\bea\wlserver6.x\config\mydomain\applications\DefaultWebApp_myserver Thus it can be accessed from client browser using URL: Please pay attention to the action and method properties in the <FORM> tag. The <input> tags define the parameters and submit button. Here a string parameter named visitor_name will be sent to HelloWorldServlet using GET method. If you open this page from browser, type your name in the text box, and press Say Hello button, only Hello World will be displayed. In order to let the servlet recognize the user input, we need to modify the servlet HelloWorldServlet.java. Change the following line: out.println("<h1>hello World</h1>"); to: out.println("<h1>hello World. Your name is: " + req.getparameter("visitor_name") + "</h1>"); Note that the parameter of req.getparameter() must match the text box name in welcome.htm. In this example both of them are visitor_name. Now you have seen an example that generates page based on user input. How can this be used in database servlet? For example, we try to design a bookstore s customer search system. We allow the user to enter the maximum price, and our servlet lists the books whose price is no greater than the given price. Note: in the sample database I gave you (the storedb and storepool ), the price is in cents. This was designed to avoid errors in floating point computations. So the number 2345 in the price field actually means $ Thus, if you want the maximum price to be $50.00, you should enter 5000 in the text box. As what we did in Hello World, we need to write an HTML page to allow user to enter the maximum price. It might look like this: 7

8 <html> <form action=/listbooksservlet method=get> <p>please enter the maximum price (in cents): <input type=text name=maxprice> <p><input type=submit value="search"> </form> </html> Of course, if you try it now, it will always display all books, no matter what the user s maximum price is. Because the ListBooksServlet is not modified yet. The modification to ListBooksServlet.java requires some SQL knowledge. The select statement can have a where clause to specify which records should be selected. For example, to select all books whose price is less than or equal to $50.00, we can use: select * from books where price<=5000 In the ListBooksServlet, the maximum price is not a hard-coded constant, it s the user input. What we need to do, is to change the following line: ResultSet rs = stmt.executequery("select * from books"); to: ResultSet rs = stmt.executequery("select * from books where price<=" + req.getparameter("maxprice")); Now, re-compile your servlet (using javac) and test it. To work on this project, you definitely need some SQL knowledge. It s not possible to give you a detailed SQL introduction in this note. The next section will show some examples which might help you understand how to compose SQL statement in your servlet. For more information, search on google.com or deja.com. Tons of information can be found if you use keywords like SQL tutorial. Basic SQL commands (by examples) SQL commands are usually case-insensitive. To make things clear, I will capitalize SQL keywords in the examples. Basically, the SQL commands can be categorized as the following: Data selection statement: select To select books whose ISBN is A : SELECT * FROM books WHERE isbn= A To select books whose names contain the word Java (fuzzy search): SELECT * BOOKS books WHERE name LIKE %Java% To make the fuzzy search case-insensitive ( java, Java, JAVA are all accepted as equivalent): SELECT * FROM books WHERE UPPER(name) LIKE UPPER( %java% ) Combined conditions can be used: SELECT * FROM books WHERE name LIKE %Java% AND price<=5000 Data insertion statement: insert To add a new book into the book database: INSERT INTO books (isbn, name, price, inv) VALUES ( B1243, A New Book, 3456, 20) Data deletion statement: delete To delete the book with ISBN B1243: DELETE FROM books WHERE isbn= B1243 DELETE uses the same syntax in the WHERE clause with SELECT. Be careful: if DELETE is called without WHERE clause, all records will be deleted. 8

9 Create a new table: create If you feel bored to use books as examples, you can construct your own tables. For example, to create a student information database table: CREATE TABLE student_info ( id varchar(20) primary key unique not null, name varchar(40), age int, varchar(40) ) Simply speaking, varchar(n) means a string no longer than n characters. If the value in a field should be unique and non-blank (usually this should be something like ID), we can defined this field to be primary key unique not null. It is recommended to have a primary key field for each table. Delete (drop) a table: drop DROP TABLE student_info Conclusion Again, it s not possible to cover all the details of servlet + Weblogic + JDBC + SQL + XMLC in this note. Web is a rich resource for all these information. Usually just type the topic you want to know followed by the word tutorial in google, you will get some useful help. Another useful resource should be my ysu@cs.usfca.edu :) Feel free to write your questions to me. I ll be glad to reply in detail. 9

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