tomcat+dbcp+jndi 配置
1)添加jar包 tomcat6中 TOMCAT_HOME/lib 下是公用jar包
dbcp需要3个jar包:Jakarta-Commons DBCP,Jakarta-Commons Collections,Jakarta-Commons Pool, 但是tomcat6已经用1个tomcat-dbcp.jar包含了这3个jar包,该包在 TOMCAT_HOME/lib 下,因此在tomcat下不需要再添加dbcp相关的3个包;
将mysql-connector-java-5.1.6-bin.jar 拷贝到 TOMCAT_HOME/lib 下;
2)添加数据源
在 TOMCAT_HOME/conf/context.xml 中 添加数据源:
<Context> <WatchedResource>WEB-INF/web.xml</WatchedResource> <Resource name="jdbc/test" auth="Container" type="javax.sql.DataSource" maxActive="100" maxIdle="30" maxWait="10000" username="root" password="" driverClassName="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost:3306/test?autoReconnect=true"/> </Context>
3)在web.xml 中引用数据源
<display-name>JNDI Test</display-name> <description>A test for using of JNDI</description> <resource-ref> <description>DB Connection</description> <res-ref-name>jdbc/test</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref>
4)在jsp(或java)中使用数据源
<%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql" %> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <sql:query var="rs" dataSource="jdbc/test"> select * from test </sql:query> <html> <head> <title>DB Test</title> </head> <body> <h2>Results</h2> <c:forEach var="row" items="${rs.rows}"> id ${row.id}<br/> str ${row.str}<br/> </c:forEach> </body> </html>
5)tomcat的jndi实用类
/** * 从数据库连接池获取数据库的链接 */ public Connection getConnection() { try { Context context = new InitialContext(); DataSource ds = (DataSource) context.lookup("java:comp/env/jdbc/oa"); } catch (NamingException e) { e.printStackTrace(); throw new RuntimeException("jndi 数据源加载失败!"); } boolean succ = false;
Connection conn=null;
try { conn = ds.getConnection(); succ = true; } catch (SQLException e) { e.printStackTrace(); System.out.println("connection error"); } return conn; }