JNDI tomcat

JNDI数据源简易配置：

/WebRoot/META-INF/context.xml

</Context>

web.xml

<resource-ref>
  <description>mysql</description>


  <res-ref-name>jdbc/workflow</res-ref-name>

  <res-type>javax.sql.DataSource</res-type>
  <res-auth>Container</res-auth>
</resource-ref>

mysql的jar包，放到项目下，并放到tomcat目录下

tomcat-6.0.14\lib\mysql-connector-java-5.1.5-bin.jar

tomcat-5.5.35\common\lib\mysql-connector-java-5.1.5-bin.jar(tomcat5，可不放)

测试类：

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;

public class DataSourceUtil {

// java:comp/env/是必须加的,后面跟你的DataSource名
private String JNDI = "java:comp/env/jdbc/workflow";

private DataSource ds = null;
private Connection conn = null;
private PreparedStatement pstm = null;
private ResultSet rs = null;

//构造函数
public DataSourceUtil() {

  try {
   // 初始化查找命名空间
   Context ctx = new InitialContext();
   // InitialContext ctx = new InitialContext();亦可
   // 找到DataSource,对名称进行定位java:comp/env是必须加的,后面跟你的DataSource名
   ds = (DataSource) ctx.lookup(JNDI);
   // 取出连接
   conn = ds.getConnection();
   System.out.println("connection pool connected !!");
  } catch (NamingException e) {
   System.out.println(e.getMessage());
  } catch (SQLException e) {
   e.printStackTrace();
  } finally {
   // 注意不是关闭,是放回连接池.
   //conn.close();
  }
}

// 注意不是关闭,是放回连接池.
public void colse(){
  if(conn != null){
   try {
    conn.close();
   } catch (SQLException e) {
    e.printStackTrace();
   }
  }
}

public ResultSet find(String sql) throws SQLException{
  pstm = conn.prepareStatement(sql);
  rs = pstm.executeQuery();
  return rs;
}

public void displayRs(ResultSet rs) throws SQLException{
  while(rs.next()){
         System.out.println("user name is " + rs.getString(1));
     }
}

public static void main(String[] args) {
  DataSourceUtil dsu = new DataSourceUtil();
}

}

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