JSP操作MySQL数据库实例讲解
JSP操作MySQL数据库实例讲解一:概述在开始介绍之前先谈谈为什么要写这片文章,个人认为作为一个运维工程师,我们要熟悉的知识网络,不仅仅要限于点知识的掌握,
JSP操作MySQL数据库实例讲解
一:概述
在开始介绍之前先谈谈为什么要写这片文章,个人认为作为一个运维工程师,我们要熟悉的知识网络,香港空间,不仅仅要限于点知识的掌握,比如linux系统,web服务器的搭建,数据库等等,还要熟悉这些点组成的网络,确切的说,点之间的是怎么相互影响的,点与点之间怎么相互操作等等,比如在某个点出现问题时,我们可以系统的分析,最终查找到问题的根源。那么在web前端的JSP程序(或者PHP,ASP等)是怎么通过中间的程序与后台的数据库建立起一条线(这里我们暂且将JSP,tomcat,mysql称为一条所谓的线),怎么通信,怎么相互影响,这里涉及的内容太多了,限于个人水平有恨,仅介绍一下JSP怎么通过tomcat,美国空间,连接后台的mysql数据库。
二:拓扑图
实验环境:Centos5.8(kernel 2.6.18)+tomcat5.5+mysql5.0
三:JSP连接MySQL
注:服务器的搭建不是本文的重点
这里先介绍一下前端的JSP页面和Tomcat连接的相关知识点,香港虚拟主机,这里谈谈个人的理解,首先JSP程序和tomcat通信要通过tomcat提供的连接池,tomcat可以在连接池中设置最大数量的连接,提供给JSP程序连接,连接池中的连接可以动态的释放与回收。但是连接池中提供的连接数要小于Mysql连接池的数量。
tomcat配置连接池
type="javax.sql.DataSource"tomcat5.5参数解释:
在web应用程序的目录下创建WEB-INF/web.xml,并添加如下内容
JSP连接数据库的用户
JSP测试页面
四:测试
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To deploy a JAR project to Tomcat, follow these steps: Download and unzip Tomcat. Configure the server.xml file, set the port and project deployment path. Copies the JAR file to the specified deployment path. Start Tomcat. Access the deployed project using the provided URL.

To allow the Tomcat server to access the external network, you need to: modify the Tomcat configuration file to allow external connections. Add a firewall rule to allow access to the Tomcat server port. Create a DNS record pointing the domain name to the Tomcat server public IP. Optional: Use a reverse proxy to improve security and performance. Optional: Set up HTTPS for increased security.

Tomcat installation directory: Default path: Windows: C:\Program Files\Apache Software Foundation\Tomcat 9.0macOS:/Library/Tomcat/Tomcat 9.0Linux:/opt/tomcat/tomcat9 Custom path: You can specify it during installation. Find the installation directory: use whereis or locate command.

To deploy multiple projects through Tomcat, you need to create a webapp directory for each project and then: Automatic deployment: Place the webapp directory in Tomcat's webapps directory. Manual deployment: Manually deploy the project in Tomcat's manager application. Once the project is deployed, it can be accessed by its deployment name, for example: http://localhost:8080/project1.

How to check the number of concurrent Tomcat connections: Visit the Tomcat Manager page (http://localhost:8080/manager/html) and enter your user name and password. Click Status->Sessions in the left navigation bar to see the number of concurrent connections at the top of the page.

The Tomcat website root directory is located in Tomcat's webapps subdirectory and is used to store web application files, static resources, and the WEB-INF directory; it can be found by looking for the docBase attribute in the Tomcat configuration file.

The Tomcat port number can be viewed by checking the port attribute of the <Connector> element in the server.xml file. Visit the Tomcat management interface (http://localhost:8080/manager/html) and view the "Status" tab. Run "catalina.sh version" from the command line and look at the "Port:" line.

To configure Tomcat to use a domain name, follow these steps: Create a server.xml backup. Open server.xml and add the Host element, replacing example.com with your domain name. Create an SSL certificate for the domain name (if required). Add an SSL connector in server.xml, change the port, keystore file, and password. Save server.xml. Restart Tomcat.
