Not long ago, I saw an article on configuring the database connection pool in Tomcat on the blog of l_xiaodao. I tried to configure the database twice as described in the following comparison: I tried sqlserver database once, the other is the Oracle database. The configuration process is described as follows:
My tomcat version is 5.0.25. First create a directory D:/test in disk D, then create the WEB-INF directory under test, create the classes directory and lib directory under the WEB-INF directory, copy a copy of the web under the existing web application directory. remove unnecessary content from the XML file. Create a test. xml file under <catalina_home>/CONF/Catalina/localhost. the specific content of the file is as follows:
<? XML version = '1. 0' encoding = 'utf-8'?>
<Context crosscontext = "true" DEBUG = "5" docbase = "D:/test" Path = "/test" reloadable = "true">
<Resource Name = "JDBC/zhukai" type = "javax. SQL. datasource"/>
<Resourceparams name = "JDBC/zhukai">
<Parameter>
<Name> URL </Name>
<Value> JDBC: oracle: thin: @ 192.168.10.120: 1521: ora32 </value>
</Parameter>
<Parameter>
<Name> maxidle </Name>
<Value> 30 </value>
</Parameter>
<Parameter>
<Name> maxactive </Name>
<Value> 10 </value>
</Parameter>
<Parameter>
<Name> driverclassname </Name>
<Value> oracle. JDBC. Driver. oracledriver </value>
</Parameter>
<Parameter>
<Name> maxwait </Name>
<Value> 10000 </value>
</Parameter>
<Parameter>
<Name> username </Name>
<Value> tjpt </value>
</Parameter>
<Parameter>
<Name> password </Name>
<Value> tjpt </value>
</Parameter>
</Resourceparams>
</Context>
Then write a test index. jsp file (refer to the blog from l_xiaodao ):
<% @ Page contenttype = "text/html; charset = gb2312" Language = "Java" Import = "Java. SQL. *" errorpage = "" %>
<! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en" "http://www.w3.org/TR/html4/loose.dtd">
<HTML>
<% @ Page import = "javax. SQL. *" %>
<% @ Page import = "javax. Naming. *" %>
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = gb2312">
<Title> î þ ± ê ì â î äµ</title>
</Head>
<Body>
<%
Try {
Initialcontext cxt = new initialcontext ();
Out. Print ("first success ");
Datasource DS = (datasource) cxt. Lookup ("Java: COMP/ENV/jdbc/zhukai ");
Out. Print ("second success ");
Connection conn = Ds. getconnection ();
Out. Print ("third success ");
Statement stmt = conn. createstatement ();
String SQL = "select count (*) from xt_corpusers ";
Resultset rs1_stmt.exe cutequery (SQL );
While (Rs. Next ()){
Out. println (Rs. getstring (1 ));
}
}
Catch (exception e) {// out. println ("there is exception" + E. getmessage ());
E. printstacktrace ();
}
%>
</Body>
</Html>
Restart Tomcat and open IE and enter http: // localhost: 8080/test to check whether the database configuration is successful.
Note: Normally, I fail to succeed. This error often occurs: cannot create JDBC driver of class ''for connect URL 'null'. I checked a lot of information online, I also attended some foreign forums and found that many of my colleagues had such problems. Some people suggest copying web. XML to the META-INF directory, but to change the name, the content is the same. However, according to replies from many people, there was almost no error in the original configuration file. After I came back from dinner, I took the test. it's strange that XM is deleted and re-written.Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
