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/* OracleTestServlet - This is a sample servlet which connects to an Oracle instance. It includes some code to log various points of invocation and execution into the WebSphere Application Server\\\'s log. It also sets a log file (in the current directory where the servlet is invoked) for the JDBC driver. This JDBC driver log can be examined along with the servlet\\\'s log output in order to determine configuration problems. Create the corresponding class file from this source and move it to the appropriate servlets directory. Marc Connolly Oracle Corporation Email: mdconnol@us.oracle.com */ import java.io.File; import java.io.IOException; import java.lang.IllegalStateException; import java.io.PrintWriter; import java.io.PrintStream; import java.io.FileWriter; import java.io.FileOutputStream; import java.sql.DriverManager; import java.sql.Connection; import java.sql.SQLException; import java.sql.Statement; import java.sql.ResultSet; import java.util.Date; import javax.servlet.Servlet; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpUtils; public class OracleServlet extends HttpServlet { private String thisServletName = "OracleTestServlet"; private String thisServletNameDesc = " Oracle JDBC Test Servlet"; private boolean servletInitialized = false; private long servletStartTimeStamp; public void init(ServletConfig config) throws ServletException { super.init(config); /* Record the servlet\\\'s initialization time */ servletStartTimeStamp = System.currentTimeMillis(); log(thisServletName + ":Init Completed"); /* Mark servlet init complete */ servletInitialized = true; } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { log("Start Menu Visual List()"); log(thisServletName + "doGet (Start)"); long startTimeStamp = System.currentTimeMillis(); response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<HTML><TITLE>OracleTestServlet: Using Oracle JDBC Driver</TITLE><BODY>"); out.println("<BR><BR<BR<HR><CENTER>Begin Employee List</CENTER><BR><BR>"); out.println("<PRE>"); /* Enable JDBC Driver logging */ String jdbcDriverlogFileName = "./OracleServletJDBC.log"; log(thisServletName + "JDBC Log: " + jdbcDriverlogFileName); /* Make the log file */ File file = new File(jdbcDriverlogFileName); if (file.exists()) { if (!file.canWrite()) { log(thisServletName + "JDBC Driver Log file (" + file.getAbsolutePath() + ") is not writable"); } } else { try { File parent = new File(file.getParent()); if (!parent.canWrite()) { log(thisServletName + "JDBC Driver Log file directory (" + parent.getAbsolutePath() + ") is not writable"); } } catch (NullPointerException e) { // no parent. } } try { DriverManager.setLogStream(new PrintStream(new FileOutputStream(file.getAbsolutePath(), true))); } catch (IOException ioE) { log(thisServletName + "JDBC Driver Log - exception thrown during setLogStream:" + ioE); } try { log(thisServletName + "Registering Driver(before)"); DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver()); log(thisServletName + "Registering Driver(after)"); /* Note regarding connection url: the ip address is the address of the host upon which the Oracle instance is running followed by the port which the Oracle instance\\\'s listener (the TNS address space) is using as specified in the .PARMLIB(MPMTNS) member of the Oracle\\\'s MPM started task. */ Connection conn = DriverManager.getConnection ("jdbc:oracle:thin:@9.12.2.10:1621:MPM5","system", "manager"); log(thisServletName + "Get Connection(After)"); Statement stmt = conn.createStatement (); log(thisServletName + "Create Statement(After)"); ResultSet rset = stmt.executeQuery ("select EMPNO, ENAME from scott.EMP"); log(thisServletName + "Execute Query(After)"); while (rset.next ()) out.println("<BR>EMPNO:" + rset.getString (1) + ",NAME:" + rset.getString (2)); log(thisServletName + "Close Connection(Before)"); conn.close(); log(thisServletName + "Close Connection(Before)"); } catch (Exception e) { log(thisServletName + "Exception:" + e); } out.println("</PRE><BR><HR><CENTER>End Employee List</CENTER></ FORM></BODY></HTML>"); out.close(); log(thisServletName + "doGet (End)"); } public void destroy() { log(thisServletName + ":Terminated"); super.destroy(); } public boolean isInitialized() { return servletInitialized; } public String getServletInfo() { return thisServletNameDesc; } } 返回类别: 教程 上一教程: 一个体现Java接口及工厂模式长处的例子 下一教程: 学习Java的30个基本概念 您可以阅读与"orcale测试实例"相关的教程: · 用JSP建立实例网站 · 实例详解JSP内置对象 · Java用户界面本地化实例探索 · 测试你对技术的把握度:JSP程序员成长之路 · 实例讲解JSP MODEL2体系结构(中) |
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