保存下面到 %JBOSS_HOME%/server/default/deploy/mysql-ds.xml文件里<?xml version="1.0" encoding="UTF-8"?><datasources>
  <local-tx-datasource>
    <jndi-name>MySqlDS</jndi-name>
    <connection-url>jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=GB2312</connection-url>
    <driver-class>org.gjt.mm.mysql.Driver</driver-class>
    <user-name>sa</user-name>
    <password>sa</password>
  </local-tx-datasource>
</datasources>调用方法:
      ctx = new InitialContext();
      ds = (javax.sql.DataSource)ctx.lookup("java:/MySqlDS");
OK!!!