Tomcat配置数据库、连接池、数据源

1、首先导入JDBC驱动。

2、更改context.xml文件

<?xml version='1.0' encoding='utf-8'?>
<Context reloadable="true">
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
    <Resource name="jdbc/TestDB" auth="Container" type="javax.sql.DataSource"
               maxActive="100" maxIdle="30" maxWait="10000"
               username="root" password="3.14" driverClassName="com.mysql.jdbc.Driver"
               url="jdbc:mysql://localhost:3306/test"/>
</Context>

3、代码

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.sql.DataSource;


try {  
   Connection conn=null;
   Context context = new InitialContext();
   DataSource ds = (DataSource)context.lookup("java:/comp/env/jdbc/TestDB");
   conn=ds.getConnection();
    
   PreparedStatement pstmt=conn.prepareStatement("select * from person");
   ResultSet rs=(ResultSet) pstmt.executeQuery();
   while(rs.next()){
    out.println(rs.getString("username"));
    out.println("-----------------");
     }
     rs.close();
     pstmt.close();
     conn.close();
    } catch (NamingException e) {
   e.printStackTrace();
  } catch (SQLException e) {
   e.printStackTrace();
  }

1 <%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql" %>
2 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
3 <sql:query var="rs" dataSource="jdbc/TestDB">select * from person
4 </sql:query>
5 <c:forEach var="row" items="${rs.rows}">
6     username ${row.username}:password ${row.password}<br/>
7 </c:forEach>