首页 > 代码库 > Spring通过JNDI获取在Tomcat容器中配置的C3P0数据源
Spring通过JNDI获取在Tomcat容器中配置的C3P0数据源
开始直接使用Spring通过JNDI获取在Tomcat容器中配置的数据源,Tomcat默认的应该是DBCP连接池,没问题,一切OK,由于Hibernate和Spring都推荐使用C3P0连接池,所以就尝试配置一下,没想到整了半下午,才搞定配置,惭愧!网上的内容眼花缭乱,鱼龙混杂,不如自己靠谱!直接上代码,后面附出现的问题!
配置两个地方:
1.Tomcat\conf下的context.xml
2.Spring的配置文件
提示:
1.如果要优化连接池的性能,要对参数进行设置,具体的要看官网!官网最靠谱!官网是王道!
C3P0:http://www.mchange.com/projects/c3p0/
DBCP:http://commons.apache.org/proper/commons-dbcp/
2.C3P0的jar包要放在WEB-INF\lib中,也要放到Tomcat\lib包中
3.通过JNDI配置可以使项目与不同数据库的配置达到解耦的目的
context.xml
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | <!-- DBCP连接池 --> < Resource name = "jdbc/gdDB" auth = "Container" type = "javax.sql.DataSource" username = "scott" password = "tiger" driverClassName = "oracle.jdbc.driver.OracleDriver" url = "jdbc:oracle:thin:@localhost:1521:orcl" testOnBorrow = "true" testOnReturn = "true" testWhileIdle = "true" validationQuery = "SELECT COUNT(*) FROM DUAL" maxIdle = "30" maxWait = "5000" maxActive = "100" initialSize = "10" /> <!-- C3P0连接池 --> < Resource name = "jdbc/DB" auth = "Container" user = "scott" password = "tiger" driverClass = "oracle.jdbc.driver.OracleDriver" jdbcUrl = "jdbc:oracle:thin:@localhost:1521:orcl" maxPoolSize = "30" minPoolSize = "1" initialPoolSize = "5" acquireIncrement = "2" idleConnectionTestPeriod = "60" maxIdleTime = "60" factory = "org.apache.naming.factory.BeanFactory" type = "com.mchange.v2.c3p0.ComboPooledDataSource" /> |
applicationContext.xml
1 2 3 4 5 6 7 8 9 10 11 12 13 | <!-- 配置JNDI数据源 --> < bean id = "dataSource" class = "org.springframework.jndi.JndiObjectFactoryBean" > < property name = "jndiName" > <!-- <value>java:comp/env/jdbc/c3p0DB</value> --> < value >java:comp/env/jdbc/DB</ value > </ property > </ bean > < bean id = "jdbcTemplate" class = "org.springframework.jdbc.core.JdbcTemplate" > < property name = "dataSource" > < ref bean = "dataSource" /> </ property > </ bean > |
出现的问题:
1.javax.naming.NamingException: No set method found for property: username
解决方法:
context.xml中,C3P0连接池的配置参数不正确,开始直接Copy上面的DBCP的配置,后来发现DBCP与C3P0的参数名字是不一样的,包括大小写一定要注意!
2.org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type ‘com.mchange.v2.c3p0.mbean.C3P0PooledDataSource‘ to
required type ‘javax.sql.DataSource‘ for property ‘dataSource‘
解决方法:
context.xml中,C3P0连接池的type值配置错误,配置成type="com.mchange.v2.c3p0.ComboPooledDataSource"就OK了!
其它问题就记不太清了!能用就好,有时间再研究优化配置及内部实现原理!
另:发现网上好多贴子说,要配置三处,还有一处是web.xml,但我可检测不需要配置web.xml文件,难道我错了吗?如果有朋友有好的见解,欢迎交流指正,互相学习!