選舉網站畢業設計任務書(編輯修改稿)

　

【文章內容簡介】 he expression and Script can be used in nine implicit objects。 behavior is to create, modify, or highlevel JSP using the object element, using strict XML syntax for encoding. Benefits of JSP JSP pages are translated into servlets. So, fundamentally, any task JSP pages can perform could also be acplished by servlet. However, this underlying equivalence does not mean that servlets and JSP pages are equally appropriate in all scenarios. The issue is not the power of the technology, it is the convenience, productivity, and maintainability of one or the other. After all, anything you can do on a particular puter platform in the Java programming language you could also do in assembly language. But it still matters which you choose. JSP provides the following benefits over servlets alone: (1) It is easier to write and maintain the HTML. Your static code is ordinary HTML: no extra backslashes, no double quotes, and no lurking Java syntax. (2) You can use standard Website development tools. Even HTML tools that know nothing about JSP can be used because they simply ignore the JSP tags. (3) You can divide up your development team. The Java programmers can work on the dynamic code. The Web developers can concentrate on the presentation layer. On large projects, this division is very important. Depending on the size of your team and the plexity of your project, you can enforce a weaker or stronger separation between the static HTML and the dynamic content. Now, this discussion is not to say that you should stop using servlets and use only JSP instead. By no means. Almost all projects will use both. For some requests in your project, you will use servlets. For others, you will use JSP. For still others, you will bine them with the MVC architecture. You want the appropriate tool for the job, and servlets, by themselves, do not plete your toolkit. Versus JavaScript JavaScript, which is pletely distinct from the Java programming language, is normally used to dynamically generate HTML on the client, building parts of the Web page as the browser loads the document. This is a useful capability and does not normally overlap with the capabilities of JSP (which runs only on the server). JSP pages still include SCRIPT tags for JavaScript, just as normal HTML pages do. In fact, JSP can even be used to dynamically generate the JavaScript that will be sent to the client. So, JavaScript is not a peting technology。 it is a plementary one. It is also possible to use JavaScript on the server, most notably on Sun ONE (formerly iPla), IIS, and Broad Vision servers. However, Java is more powerful, flexible, reliable, and portable. Compared with the traditional CGI, the JSP has the equal advantage. First, on the speed, the traditional procedure of CGI needs to use the standard importation of the system to output the equipments to carry out the dynamic state web page born, but the JSP is direct is mutually the connection with server. And say for the CGI, each interview needs to add to add a progress to handle, the progress build up and destroy by burning constantly and will be a not small burden for calculator of be the server of Web. The next in order, the JSP is specialized to develop but design for the Web of, its purpose is for building up according to the Web applied procedure, included the norm and the tool of the whole set. Use the technique of JSP can bine a lot of JSP pages to bee a Web application procedure very expediently. Using JSP Web connection to the database to achieve Java using the JDBC database is a prehensive technical treatment, general way, to achieve connection to the database, perform operations such as query and extract data. Many relational database management systems with a JDBC driver. Specific steps are as follows: 1, plete the environmental setting, import package, the mand is as follows: Import .* 2, load drive JDBC driver specification structure based on the drive into JDBCODBC Bridge, pure Java and pure Java middleware to the database directly to the database types. In this, the use of Java native API with some type of drive, as explicitly create an instance of the drive and use the drive manager up: (new ())。 3, connect to the database Driver manager keeps a list of registered drivers, call the getConnection () method get Connection object. One getConnection () the parameters are the database server IP address, port number, bank name and account number required for login and password database, the sample is as follows: Connection conn = ( jdbc: oracle: thin: @ localhost: 1521: demo, username, password)。 4, Statement Interface SQL languages consist of a relational database created from that and extract the data statements. JDBC provides the SQL statements used to encapsulate the objectoriented representation of the text, implementation status and results. This indicated called the interface. Use prepiled SQLPreparedStatement and CallableStatement to call a stored procedure extends the Statement interface, the two subfunctions, the sample is as follows: Statement stmt = ()。 5, to obtain the result set A result set is ordered list of table rows, the use of JDBC in the interface presentation. The result set from the Statement interface executeQuery () method or some method calls generated metadata, the sample is as follows: ResultSet rs = (sql)。 Access to efficient use of connection pooling optimization In this instance, the application layer using WebLogic , the database layer using , Navigate the browser client. Example In this instance, create a connection pool named ConnectionPool. ConnectionPool the basic properties of the following: m_ConnectionPoolSize minimum number of connections the connection pool。 m_ConnectionPoolMax maximum number of connections the connection pool。