不是写得很清楚吗
Class db.DbConnection not found
检查你的路径设置
检查你的代码
Class db.DbConnection not found
检查你的路径设置
检查你的代码
解决方案 »
- Ext.data.JsonStore如获取查询过的数据?
- 很奇怪的问题
- 下载页面中,为何不能显示html中内容??请各位高手帮忙解答
- 100!JSP上传EXCEL文件!
- 求一条sql语句
- 急!!!!如何取道客户机的mac地址阿!!!跪求加分阿!!
- 求救!!怎么样将我的主页地址http://192.168.0.50:8080/index.jsp 用一个简单的几个字符来代替
- jsp保存到数据库中的特殊字符怎样处理?
- 可以让浏览器自动提示用户下载并安装软件吗?
- <jsp:include...问题,
- zcolin (逍遥花生) 请进,问一下tomcat整合iis的问题
- jsp访问数据库的包那里得到(100分求解),不够再加
2.如果已经配置了classpath,检查该页面是否有正确的import语句
/*******testbean.jsp************/
<jsp:useBean id="Login" scope="page" class="aaa.Linkdb" />
/************Linkdb.java**************/
文件放在web-inf/classes/aaa/Linkdb.java
package aaa;import java.sql.*;public class Linkdb {
String strDriver="org.gjt.mm.mysql.Driver";
String strConn="jdbc:mysql://localhost/hzxlnet?user=root&password=root";
private Connection conn = null;
private Statement stmt = null;
ResultSet rs = null; public Linkdb()
{
//连接MySql_jdbc驱动程序
try {
Class.forName(strDriver).newInstance();
} catch (Exception E) {
System.err.println("不能连接MySql数据库!");
}
}
//执行Select语句
public ResultSet executeQuery(String sql) {
rs = null;
try {
conn = DriverManager.getConnection(strConn);
stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
rs = stmt.executeQuery(sql);
}catch(SQLException ex) {
System.err.println("执行SQL语句出错:" + ex.getMessage());
}
return rs;
} //执行Insert,Update语句
public void executeUpdate(String sql) {
stmt = null;
rs=null;
try {
conn = DriverManager.getConnection(strConn);
stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
stmt.executeQuery(sql);
stmt.close();
conn.close();
}
catch(SQLException ex) {
System.err.println("执行SQL语句出错: " + ex.getMessage());
}
} public void closeStmt(){
try{
stmt.close();
}
catch(SQLException e){
e.printStackTrace();
}
} public void closeConn(){
try{
conn.close();
}
catch(SQLException e){
e.printStackTrace();
}
}
}
/**********调用testbean.jsp时的出错信息********************/
Error: 500
Location: /testbean.jsp
Internal Servlet Error:org.apache.jasper.JasperException: Unable to compile E:\server\tomcat\work\DEFAULT\ROOT\testbean_2.java:50: Class aaa.Linkdb not found.
aaa.Linkdb Login = null;
^
E:\server\tomcat\work\DEFAULT\ROOT\testbean_2.java:53: Class aaa.Linkdb not found.
Login= (aaa.Linkdb)
^
E:\server\tomcat\work\DEFAULT\ROOT\testbean_2.java:58: Class aaa.Linkdb not found.
Login = (aaa.Linkdb) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "aaa.Linkdb");
^
3 errors at org.apache.tomcat.facade.JasperLiaison.javac(Unknown Source)
at org.apache.tomcat.facade.JasperLiaison.processJspFile(Unknown Source)
at org.apache.tomcat.facade.JspInterceptor.requestMap(Unknown Source)
at org.apache.tomcat.core.ContextManager.processRequest(Unknown Source)
at org.apache.tomcat.core.ContextManager.internalService(Unknown Source)
at org.apache.tomcat.core.ContextManager.service(Unknown Source)
at org.apache.tomcat.modules.server.Ajp13Interceptor.processConnection(Unknown Source)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(Unknown Source)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(Unknown Source)
at java.lang.Thread.run(Thread.java:484)/**************可我把这个文件放在/web-inf/classes/bbs/Linkdb下,再已同样的方法调用就没有错了也就是有些bean文件可以调用成功有些就不能调用成功很奇怪已经困扰了我好几天了******************************/
<jsp:useBean id="Login" scope="page" class="bbs.Linkdb" />
/***********各位前非辈能否帮这个忙万分感谢***************************/