我在jsp页面的正文部分插入了以下java代码,以从Oracle 10g数据库中检索表FLIGHTDATA的记录。但是在执行Class.forName(...)行后,程序直接进入最后阻塞并关闭连接而不返回任何数据。任何建议,我做错了什么?谢谢 - 索姆纳特没有使用JSP从Oracle 10g数据库返回的数据记录
<%@ page import="java.sql.*" %>
<%@ page import="java.io.*" %>
<%
out.println("<table border='1'><tr>");
Connection connection = null;
Statement statement = null;
ResultSet rs_1hop = null;
ResultSetMetaData rsm_1hop = null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
String connectionURL = "jdbc:oracle:thin:@localhost:1521:xe";
connection = DriverManager.getConnection(connectionURL, "system", "system");
statement = connection.createStatement();
// sql query to retrieve values from the secified table.
String QueryString = "SELECT * from FLIGHTDATA";
rs_1hop = statement.executeQuery(QueryString);
rsm_1hop = rs_1hop.getMetaData();
int colCnt = rsm_1hop.getColumnCount();
for (int i=1; i<=colCnt; ++i) {
out.println("<th>" + rsm_1hop.getColumnName(i) + "</th>");
}
out.println("</tr>");
while (rs_1hop.next()) {
out.println("<tr>");
for (int i=1; i<=colCnt; ++i)
out.println("<td>" + rs_1hop.getString(i) + "</td>");
out.println("</tr>");
}
} catch (Exception e) {
} finally {
if (statement != null)
statement.close();
if (connection != null)
connection.close();
}
out.println("</table><br><br>");
%>
下/ WEB-INF/lib目录添加在catch块的ServletException由BalusC评论,并添加odbc6.jar文件后,我得到它,我想是因为以下错误消息找不到jdbc驱动程序。
我也尝试在Apache Tomcat安装dir/ROOT/web-apps/WEB_INF/lib下添加jar文件,以便它们可用于所有web应用程序,但问题仍然存在。
description The server encountered an internal error() that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: javax.servlet.ServletException: DB interaction failed! org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:500)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:410)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
根源
javax.servlet.ServletException: DB interaction failed!
org.apache.jsp.retrievePossibleRoutes_jsp._jspService(retrievePossibleRoutes_jsp.java:96)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
根源
java.lang.ClassNotFoundException: oracle.jdbc.driver.OracleDriver
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:128)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66)
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Unknown Source)
org.apache.jsp.retrievePossibleRoutes_jsp._jspService(retrievePossibleRoutes_jsp.java:73)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
嗨,我已经在我的项目构建路径的Libraries选项卡下添加了ojdbc6.jar。这不够吗? – somnathchakrabarti 2012-04-24 20:14:25
不需要。您需要在项目属性的* Deployment Assembly *部分配置它,以便让JAR文件最终在构建的WAR的'/ WEB-INF/lib'文件夹中结束。但这很笨拙。只需在项目的'/ WEB-INF/lib'文件夹中手动删除物理JAR文件即可。不要忘记在构建路径中撤消您之前所做的更改。这些变化是不必要的,可能会冲突。当您将JAR文件放在项目的'/ WEB-INF/lib'文件夹中时,IDE将自动处理正确的构建路径设置。 – BalusC 2012-04-24 20:16:26
是的,我从项目构建路径 - >库中删除了这些文件,并将它们添加到/WebContent/WEB-INF/lib以及/web-apps/ROOT/WEB-INF/lib可用于所有网络应用程序。但是现在由于在catch块中添加了ServletException而引发了详细的错误消息,问题依然存在。 –
somnathchakrabarti
2012-04-24 20:35:33