东方通tongweb使用jndi访问数据源以及达梦数据测试
项目需要，研究国产中间件东方通tongWeb和国产数据库达梦数据库dmdbs7
测试tongweb6.0的jndi使用方法
环境如下：
jdk1.7，TongWeb6.0,达梦数据库dm7，eclipse
目标：简单测试数据库连通并输出到网页
前期工作，部署tongweb6.0服务到eclipse，这个自己摸索，或者看文档
访问http://localhost:9060/console打开tongweb控制台》jdbc配置》创建 jdbc
jdbc名称叫dm15，数据源选择达梦，测试连通成功
tongweb会自己在jndi里面生成一个dm15的jndi连接
1在eclipse中新建一个maven项目，新建一个servlet，
package com.nanjing.dameng;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;
/**
* Servlet implementation class TestServlet
*/
public class TestServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
static String sqlQuery = "select CITY_ID,CITY_NAME,REGION_ID from CITY;";
/**
* @see HttpServlet#HttpServlet()
*/
public TestServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the GET method success</br>");
Context ctx;
try {
ctx = new InitialContext();
String strLookup = "java:comp/env/dm15";
DataSource ds = (DataSource) ctx.lookup(strLookup);
Connection con = ds.getConnection();
PreparedStatement pstmt = con.prepareStatement(sqlQuery);
ResultSet rs = pstmt.executeQuery();
out.print("jndi connection success");
while (rs.next()) {
out.println(rs.getString(1) + "/" + rs.getString(2)+ "/</br>" );
}
System.out.println("查询结束!");
pstmt.close();
if (con != null) {
out.print("jndi connection close");
con.close();
}
} catch (NamingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally{
}
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the POST method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
}
2pom中引入达梦数据库jdbc的jar包，servlet包
3 web.xml配置如下
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<resource-ref>
<description>DB Connection</description>
<res-ref-name>dm15</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
<servlet>
<!-- 类名 -->
<servlet-name>do1</servlet-name>
<!-- 所在的包 -->
<servlet-class>com.nanjing.dameng.TestServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>do1</servlet-name>
<!-- 访问的网址 -->
<url-pattern>/servlet/do1</url-pattern>
</servlet-mapping>
</web-app>
4访问本地地址http://localhost:28080/demo01/servlet/do1
显示成功
This is class com.wisdom.dameng.TestServlet, using the GET method success
BJ /北京/
SJZ/石家庄/
SH /上海/
NJ /南京/
备注：
1不需要 contet.xml，如果按照tomcat的jndi方式部署，我没有成功，各种object和name找不到，我猜测tongweb找不到context文件或者有自己的文件方式
2 tongweb适用jndi其实就是3个步骤，
a在控制台新增一个数据库连接池dm15，tongweb自己就自动生成一个jndi 名字也叫dm15
b在web.xml中引入 <res-ref-name>dm15</res-ref-name>
c在调用的ctx.lookup("java:comp/env/dm15")