Tomcat实例是什么?

发布网友 发布时间：2022-04-20 08:57

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共2个回答

热心网友 时间：2022-04-21 11:13

tomcat可以在多实例模式下运行而互不干扰，tomcat下只能有一个server但能有多个service，所以只要修改tomcat的配置文件server.xml，在server中增加service就可以了，只要复制tomcat原先的service，再将端口改掉即可，例如：
<Service name="Catalina2">
<!--The connectors can use a shared executor, you can define one or more named thread pools-->
<!--
<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
maxThreads="150" minSpareThreads="4"/>
-->
<!-- A "Connector" represents an endpoint by which requests are received
and responses are returned. Documentation at :
Java HTTP Connector: /docs/config/http.html (blocking & non-blocking)
Java AJP Connector: /docs/config/ajp.html
APR (HTTP/AJP) Connector: /docs/apr.html
Define a non-SSL HTTP/1.1 Connector on port 8080
-->
<Connector port="7070" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
<!-- A "Connector" using the shared thread pool-->
<!--
<Connector executor="tomcatThreadPool"
port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
-->
<!-- Define a SSL HTTP/1.1 Connector on port 8443
This connector uses the JSSE configuration, when using APR, the
connector should be using the OpenSSL style configuration
described in the APR documentation -->
<!--
<Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"
maxThreads="150" scheme="https" secure="true"
clientAuth="false" sslProtocol="TLS" />
-->

<!-- Define an AJP 1.3 Connector on port 8009 -->
<Connector port="7009" protocol="AJP/1.3" redirectPort="8443" />

<!-- An Engine represents the entry point (within Catalina) that processes
every request. The Engine implementation for Tomcat stand alone
analyzes the HTTP headers included with the request, and passes them
on to the appropriate Host (virtual host).
Documentation at /docs/config/engine.html -->

<!-- You should set jvmRoute to support load-balancing via AJP ie :
<Engine name="Standalone" defaultHost="localhost" jvmRoute="jvm1">
-->
<Engine name="Catalina2" defaultHost="localhost">

<!--For clustering, please take a look at documentation at:
/docs/cluster-howto.html (simple how to)
/docs/config/cluster.html (reference documentation) -->
<!--
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
-->

<!-- The request mper valve mps useful debugging information about
the request and response data received and sent by Tomcat.
Documentation at: /docs/config/valve.html -->
<!--
<Valve className="org.apache.catalina.valves.RequestDumperValve"/>
-->

<!-- This Realm uses the UserDatabase configured in the global JNDI
resources under the key "UserDatabase". Any edits
that are performed against this UserDatabase are immediately
available for use by the Realm. -->
<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
resourceName="UserDatabase"/>

<!-- Define the default virtual host
Note: XML Schema validation will not work with Xerces 2.2.
-->
<Host name="localhost" appBase="web"
unpackWARs="true"
xmlValidation="false" xmlNamespaceAware="false">

<!-- SingleSignOn valve, share authentication between web applications
Documentation at: /docs/config/valve.html -->
<!--
<Valve className="org.apache.catalina.authenticator.SingleSignOn" />
-->

<!-- Access log processes all example.
Documentation at: /docs/config/valve.html -->
<!--
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
prefix="localhost_access_log." suffix=".txt" pattern="common" resolveHosts="false"/>
-->

</Host>
</Engine>
</Service>

热心网友 时间：2022-04-21 12:31

tomcat实例就是简单的一个可以和数据库进行操作的小的项目。例如登陆项目。
package e.dongruan.wangshanjun.test.;
/*
* 这个是登录
*
* **/
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import e.dongruan.wangshanjun.test.common.DBConnection;
import e.dongruan.wangshanjun.test.entity.User;

public class UserLogin {
DBConnection db=new DBConnection();
Connection con=null;
PreparedStatement ps=null;
ResultSet rs=null;
public boolean login(User u){
boolean b=false;
con=db.getConnection();
try {
ps=con.prepareStatement("SELECT * FROM dr_user WHERE user_name=? AND user_pwd=?");
ps.setString(1, u.getUser_name());
ps.setString(2, u.getUser_pwd());

rs=ps.executeQuery();

if (rs.next()) {
b=true;
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
db.closeCon(rs, ps, con);

return b;
}

}