tomcat中一个简单问题

zhao_sh 2003-08-30 02:18:49

我刚学JAVA，是一个菜鸟,在tomcat中配置完连接池后，写了一个JSP发现只要有与DataSource有关的语句就会有错，我把其它语句都去掉，只有如下语句时：
<%@page language="Java" %>
<%@page import="javax.naming.Context" %>
<%@page import="javax.naming.InitialContext" %>
<%@page import="javax.sql.DataSource" %>
<%@page import="java.sql.*" %>

<html>
<head>
</head>
<body>
<%! String strTmp="hello this is my test!!"; %>
<%=strTmp%>
</body>
</html>
出现如下错误：
org.apache.jasper.JasperException: Unable to compile class for JSPNote: sun.tools.javac.Main has been deprecated.
D:\java\Apache Tomcat 4.0\common\lib\jdbc2_0-stdext.jar(javax/sql/DataSource.java): Public interface javax.sql.DataSource must be defined in a file called "DataSource.java".
1 error, 1 warning

at org.apache.jasper.compiler.Compiler.compile(Compiler.java:285)
at org.apache.jasper.servlet.JspServlet.loadJSP(JspServlet.java:548)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary(JspServlet.java:176)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:188)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:381)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:473)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:475)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.ajp.tomcat4.Ajp13Processor.process(Ajp13Processor.java:458)
at org.apache.ajp.tomcat4.Ajp13Processor.run(Ajp13Processor.java:551)
at java.lang.Thread.run(Unknown Source)

但只要我把<%@page import="javax.sql.DataSource" %>语句去掉就没有错误了，有人知道为什么吗？

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zj2977 2003-08-30

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不要混淆了jdbc-odbc与jdbc才好啊，呵呵！

zhao_sh 2003-08-30

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cannot get Connection pool.的错误已经调好了;
但当只要有下面这句话就出现
javax.sql.DataSource ds = (javax.sql.DataSource)obj;
D:\java\Apache Tomcat 4.0\common\lib\jdbc2_0-stdext.jar(javax/sql/DataSource.java): Public interface javax.sql.DataSource must be defined in a file called "DataSource.java".的错误

zhao_sh 2003-08-30

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我的TOMCAT的配置如下：
<Context path="/myApp" docBase="D:\myApp" debug="0"
reloadable="true" crossContext="true">
<Resource name="jdbc/mySrc" auth="Container"
type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/mySrc">
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>
<parameter>
<name>maxActive</name>
<value>100</value>
</parameter>
<parameter>
<name>maxIdle</name>
<value>30</value>
</parameter>
<parameter>
<name>maxWait</name>
<value>10000</value>
</parameter>
<parameter>
<name>username</name>
<value>sa</value>
</parameter>
<parameter>
<name>password</name>
<value>password</value>
</parameter>
<parameter>
<name>driverClassName</name>
<value>com.microsoft.jdbc.sqlserver.SQLServerDriver</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbc:microsoft:sqlserver://zhaosh:1433;DatabaseName=test</value>
</parameter>
</ResourceParams>
</Context>
请问哪里有问题，多谢！！

zhao_sh 2003-08-30

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我把你哪一段拷贝过去和以前的错误是一样的。
如果我只要以下的语句
<%@ page contentType="text/html;charset=GBK"%>
<%@ page import= "java.sql.* "%>
<%@ page import= "javax.naming.* "%>
<%
try{
Context initCtx = new InitialContext();
Context ctx = (Context) initCtx.lookup("java:comp/env"); //获取连接池对象
Object obj = (Object) ctx.lookup("jdbc/mySrc"); //类型转换
}catch(Exception ex){
ex.printStackTrace();
throw new SQLException("cannot get Connection pool.");
}
%>
<hr>
则会有如下错误：
cannot get Connection pool.

selfboss 2003-08-30

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testdb.jsp内容如下：

<%@ page contentType="text/html;charset=GBK"%> <%@ page import= "java.sql.* "%> <%@ page import= "javax.naming.* "%> <% try{ Context initCtx = new InitialContext(); Context ctx = (Context) initCtx.lookup("java:comp/env"); //获取连接池对象 Object obj = (Object) ctx.lookup("jdbc/OracleDB"); //类型转换 javax.sql.DataSource ds = (javax.sql.DataSource)obj; Connection conn = ds.getConnection(); Statement stmt = conn.createStatement(); String strSql = " insert into test(id,name) values(//00001//,//holen//) "; stmt.executeUpdate(strSql); strSql = " select id,name from test "; ResultSet rs = stmt.executeQuery(strSql); if(rs.next()){ out.println(rs.getString(1)); out.println(rs.getString(2)); } }catch(Exception ex){ ex.printStackTrace(); throw new SQLException("cannot get Connection pool."); }%> <hr>

说明：先通过JNDI找到jdbc/OracleDB对象，这里是分两步完成的，也可以一步完成，如Object obj = (Object) ctx.lookup("java:comp/env /jdbc/OracleDB");
然后将得到的对象转换成DataSource类型，进而得到连接，得到连接后就可以进行相应的数据库操作了。
这里对数据库进行了两步操作，第一步是插入一条记录，第二步是从数据库中取出记录，并显示第一条记录的内容。

zhao_sh 2003-08-30

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你为是直接用jdbc-odbc桥与数据库进行通信，我现在是想用TOMCAT提供的数据库连接池来对数据库进行操作，这我就要用到TOMCAT_HOME/comment/lib目录下的jdbc2_0-stdext.jar中的DataSource类来进行操作。

zhao_sh 2003-08-30

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你为是直接用jdbc-odbc桥与数据库进行通信，我现在是想用TOMCAT提供的数据库连接池来对数据库进行操作，这我就要用到TOMCAT_HOME目录下的comment/lib目录下的jdbc2_0-stdext.jar中的DataSource类来进行操作。

selfboss 2003-08-30

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我的邮箱坏了，以下便是例子：

<%@ page contentType="text/html; charset=gb2312" language="java" %>
<%@ page import="java.io.*"%>
<%@ page import="java.util.*"%>
<%@ page import="java.sql.*"%>
<html><body>
<%
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); //加载jdbc-odbc驱动
String url="jdbc:odbc:test";
Connection con=DriverManager.getConnection(url,"admin","pass");
Statement stmt=con.createStatement();
String query="select tt from test1";
ResultSet rs=stmt.executeQuery(query);
while (rs.next()){
out.println(rs.getString(1));
out.println("<br>");
}
rs.close();
stmt.close();
}
catch(Exception ee){
out.println("有错") }
%>
</body>
</html>

zhao_sh 2003-08-30