Tomcat 的数据库�q�接池设�|�与应用(Mysql��?�?实例讲解)

Tue, 04 Apr 2006 05:40:00 GMT

我用的是配置:Tomcat5.5+JEE(jsdk1.5)+WINXP

�q�是��单的说一说文仉��|?
1:修改%tomcat%/conf/server.xml�?lt;GlobalNamingResources>后加如下内容.
            name="jdbc/DBPool" //数据源名�U?br />      type="javax.sql.DataSource"
      password="xxxxxxxx"
      driverClassName="com.mysql.jdbc.Driver"
      maxIdle="2"
      maxWait="5000"
      username="root"
      url="jdbc:mysql://127.0.0.1:3306/hptest"
      maxActive="4"/>
2.修改%tomcat%/conf/context.xm;�?lt;Context>后加
      name="jdbc/DBPool"
   type="javax.sql.DataSource"
   global="jdbc/DBPool"/>
3.修改%tomcat%/conf/web.xml

MySQL DB Connection Pool

jdbc/DBPool

javax.sql.DataSource

Container

Shareable

  �q�样配置��q��差不多了.如果具体的还不懂可见上次发的文章.
4.写一个程序测�?(写一个WEB�E�序)
   我的是Myeclipse 写的�E�序,�q�里不能从电(sh��)脑上贴图真有点不方便(我想�?.
      1:写一个连接类:
  DBPool.java
package com.test;

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

public class DBPool {
    private static DataSource pool;
    static {
         Context env = null;
          try {
              env = (Context) new InitialContext().lookup("java:comp/env");
              pool = (DataSource)env.lookup("jdbc/DBPool");
              if(pool==null)
                  System.err.println("'DBPool' is an unknown DataSource");
               } catch(NamingException ne) {
                  ne.printStackTrace();
          }
      }
    public static DataSource getPool() {
        return pool;
    }

}
    2:写一个Servlet:
  其中有是用来�q�接数据库和昄��查询�l�果.
  Mytest.java
  package com.test;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Mytest extends HttpServlet {

    /**
     * Constructor of the object.
     */
    public Mytest() {
        super();
    }

    /**
     * Destruction of the servlet.

     */
    public void destroy() {
        super.destroy(); // Just puts "destroy" string in log
        // Put your code here
    }

    /**
     * The doGet method of the servlet.

     *
     * This method is called when a form has its tag value method equals to get.
     *
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html;charset=gb2312");
        PrintWriter out = response.getWriter();
        String id=(String)request.getParameter("id");
        Connection con=null;
        try{

            con=DBPool.getPool().getConnection();
             Statement stmt=con.createStatement();
                ResultSet rst=stmt.executeQuery("select * from userinf where userid='"+id+"'");
                  if(rst.next()){
                                          out.println("
ID�?"+rst.getInt("userid"));
                      out.println("
用户�?"+com.test.ASSICTOGBR2312.trans(rst.getString("name")));
                      out.println("
地址:"+rst.getString("address" ));
                      out.println("
生日"+rst.getDate("year" ));
                  }
                  else{
                  out.println("没有�q�个ID");
                  stmt.close();
                  }
        }
        catch(Exception e){
            e.printStackTrace();
        }
        finally{  //一定要注意�q�里�Ҏ(gu��)��据库的关闭不�?br />                             //自己想了
            try{
                if(con!=null){
                    con.close();
                }

            }
          catch(Exception e){
           e.printStackTrace();

       }

        }

    }

    /**
     * The doPost method of the servlet.

     *
     * This method is called when a form has its tag value method equals to post.
     *
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request,response);

    }

    /**
     * Initialization of the servlet.

     *
     * @throws ServletException if an error occure
     */
    public void init() throws ServletException {
        // Put your code here
    }

}
      3:写一个JSP��面:
         Myjsp.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>


    ">

    My JSP 'MyJsp.jsp' starting page

    This is my JSP page.


    print input search id:




   4:其中有�{�?��Z��不显�C�Zؕ�?br />    package com.test;

import java.io.*;
public class ASSICTOGBR2312 {
      public static String trans(String ass){
          String res=null;
          byte temp[];
          try{
              temp=ass.getBytes("iso-8859-1");
              res=new String(temp);
          }
          catch(UnsupportedEncodingException en) {
              System.out.println(en.toString());
          }



          return res;

      }
}

   5:web.xml

    xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

    This is the description of my J2EE component

This is the display name of my J2EE component

Mytest

com.test.Mytest

Mytest

/servlet/Mytest

   6: 其中数据库结构如�?
      数据库名:hptest
      �?userinf
      用下面的命��o��Z��个数据库和表
      create database hptest;
      create table  userinf (
       userid int(4) not null,
       name char(10) not null,
       address varchar(50),
       year date,
       constraint fk_userinf primary key(userid));
       )
       insert into userinf values(19,'hp','cq','1982-10-22');

希望�Ҏ(gu��)��些�h能有所帮助.谢谢大家支持

刘军�?/a> 2006-04-04 13:40 发表评论

Tomcat 的数据库�q�接池设�|�与应用(Mysql��?

Tue, 04 Apr 2006 05:40:00 GMT

1�Q�将数据库驱动程序的JAR文�g攑֜�Tomcat的 common/lib 中；日前最新有�?.0
下蝲地址:http://dev.mysql.com/downloads/

2�Q�在server.xml中设�|�数据源�Q�以MySQL数据库�ؓ例，如下�Q?br />�?lt;GlobalNamingResources> 节点中加入，
            name="jdbc/DBPool"
      type="javax.sql.DataSource"
      password="xxxxxxxx" 我的密码是xxxxxxxx
      driverClassName="com.mysql.jdbc.Driver"
      maxIdle="2"
      maxWait="5000"
      username="root"
      url="jdbc:mysql://127.0.0.1:3306/test"
      maxActive="4"/>
   属性说明：name�Q�数据源名称�Q�通常取”jdbc/XXX”的格式�Q�名字一定要有意�?好记
            type�Q�”javax.sql.DataSource�?
            password�Q�数据库用户密码�Q?br />            driveClassName�Q�数据库驱动�Q?br />            maxIdle�Q�最大空闲数�Q�数据库�q�接的最大空闲时间。超�q�空闲时��_��数据库连
                     接将被标��Cؓ不可用，然后被释放。设�?表示无限制�?br />            MaxActive�Q�连接池的最大数据库�q�接数。设�?表示无限制�?br />            maxWait �Q�最大徏立连接等待时间。如果超�q�此旉��接到异常。设�?1表示
                     无限制�?br />
3�Q�在你的web应用�E�序的web.xml中设�|�数据源参考，如下�Q?br />  �?lt;web-app>节点中加入，

MySQL DB Connection Pool

jdbc/DBPool

javax.sql.DataSource

Container

Shareable

  子节点说明： description�Q�描�q�C��息；
               res-ref-name�Q�参考数据源名字�Q�同上一步的属性name�Q?br />               res-type�Q�资源类型，”javax.sql.DataSource”；
               res-auth�Q�”Container”；
               res-sharing-scope�Q�”Shareable”；

4�Q�在web应用�E�序的context.xml中设�|�数据源链接�Q�如下：
  �?lt;Context>节点中加入，
     name="jdbc/DBPool"
   type="javax.sql.DataSource"
   global="jdbc/DBPool"/>
   属性说明：name�Q�同�W?步和�W?步的属性name��|��和子节点res-ref-name��|��
             type�Q�同样取”javax.sql.DataSource”；
             global�Q�同name倹{�?br />
��x��Q�设�|�完成，下面是如何��用数据库�q�接池�?br />5�Q�徏立一个连接池�c�，DBPool.java�Q�用来创��接池�Q�代码如下：
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;

public class DBPool {
    private static DataSource pool;
    static {
         Context env = null;
          try {
              env = (Context) new InitialContext().lookup("java:comp/env");
              pool = (DataSource)env.lookup("jdbc/DBPool");
              if(pool==null)
                  System.err.println("'DBPool' is an unknown DataSource");
               } catch(NamingException e) {
                  e.printStackTrace();
          }
      }
    public static DataSource getPool() {
        return pool;
    }
}

刘军�?/a> 2006-04-04 13:40 发表评论

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Tomcat 的数据库�q�接池设�|�与应用(Mysql��?�?实例讲解)

Tomcat 的数据库�q�接池设�|�与应用(Mysql��?