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;<br>                Connection conn=null;<br>      try {
            conn = ds.getConnection();
            succ = true;
        catch (SQLException e) {
            e.printStackTrace();
            System.out.println("connection error");
        }
        return conn;
    }
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