hibernate在tomcat7.X下配置mysql数据源
先说一点题外话,LZ最近学习java web。今天刚看到hibernate,发现在hibernate配置数据源时网上的资料都太久远了,一般以tomcat 5 版本下的配置居多。而tomcat 7下的配置略有变化,新手找资料困难,可能会略受打击,故整理资料与大家共享,也可作备忘之用!若
先说一点题外话,LZ最近学习java web。今天刚看到hibernate,发现在hibernate配置数据源时网上的资料都太久远了,一般以tomcat 5 版本下的配置居多。而tomcat 7下的配置略有变化,新手找资料困难,可能会略受打击,故整理资料与大家共享,也可作备忘之用!若有不当之处,还请不吝赐教!
1.添加数据库驱动包mysql-connector-java-5.1.13-bin.jar加入到tomcat目录下的lib包中。
注意:网上几乎所有版本都说需要添加commons-dbcp-1.4.jar,commons-pool-1.5.4.jar和commons-collections.jar。
但是tomcat 7 已经不用添加这些jar文件了,因为tomcat 7的lib包下面已经集成了这些库。
官方集成文档上有:These libraries are located in a single JAR at $CATALINA_HOME/lib/tomcat-dbcp.jar.
大概意思就是:这些库文件都位于一个单独的JAR文件中,该文件的路径是/lib/tomcat-dbcp.jar。
2.修改Tomcat_Home/conf/server.xml,标签之前加入:
username="javauser" password="javadude" driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/javatest"/>
3.在context.xml中加入引用
type="javax.sql.DataSource"/>
4.在你的工程项目的web.xml中加入
5.在hibernate.cfg.xml文件中配置数据库连接,这个有很多教程,此处便不再详述。
另外,注意数据源只有在web项目中才可以使用。
再次出来写个简单的servlet来输出hibernate 的session对象:
代码如下:
package com.amaker.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.hibernate.Session;
import com.amaker.util.HibernateUtil;
@SuppressWarnings("serial")
public class testServletextends HttpServlet {
/**
* Constructor of the object.
*/
public testServlet() {
super();
}
/**
* Destruction of the servlet.
*/
public void destroy() {
super.destroy();// Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet.
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
HibernateUtil util = new HibernateUtil();
//HibernateUtil 类用来返回一个Session
对象,很简单,相信大家可以搞定。 Session session = util.getSession();
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println(""-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("");
out.println("
out.println("
");out.println(session);
out.println(" ");
out.println("");
out.flush();
out.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
/**
* Initialization of the servlet.
*
* @throws ServletException if an error occurs
*/
public void init()throws ServletException {
// Put your code here
}
}
访问结果如图,返回一个session对象。

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.

MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.

MySQL's position in databases and programming is very important. It is an open source relational database management system that is widely used in various application scenarios. 1) MySQL provides efficient data storage, organization and retrieval functions, supporting Web, mobile and enterprise-level systems. 2) It uses a client-server architecture, supports multiple storage engines and index optimization. 3) Basic usages include creating tables and inserting data, and advanced usages involve multi-table JOINs and complex queries. 4) Frequently asked questions such as SQL syntax errors and performance issues can be debugged through the EXPLAIN command and slow query log. 5) Performance optimization methods include rational use of indexes, optimized query and use of caches. Best practices include using transactions and PreparedStatemen

Apache connects to a database requires the following steps: Install the database driver. Configure the web.xml file to create a connection pool. Create a JDBC data source and specify the connection settings. Use the JDBC API to access the database from Java code, including getting connections, creating statements, binding parameters, executing queries or updates, and processing results.

The process of starting MySQL in Docker consists of the following steps: Pull the MySQL image to create and start the container, set the root user password, and map the port verification connection Create the database and the user grants all permissions to the database

The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

The key to installing MySQL elegantly is to add the official MySQL repository. The specific steps are as follows: Download the MySQL official GPG key to prevent phishing attacks. Add MySQL repository file: rpm -Uvh https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm Update yum repository cache: yum update installation MySQL: yum install mysql-server startup MySQL service: systemctl start mysqld set up booting

Laravel is a PHP framework for easy building of web applications. It provides a range of powerful features including: Installation: Install the Laravel CLI globally with Composer and create applications in the project directory. Routing: Define the relationship between the URL and the handler in routes/web.php. View: Create a view in resources/views to render the application's interface. Database Integration: Provides out-of-the-box integration with databases such as MySQL and uses migration to create and modify tables. Model and Controller: The model represents the database entity and the controller processes HTTP requests.
