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
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<!-- 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" />
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applicationContext.xml
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<!-- 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 >
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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!