tomcat5.5连续池

1、修改%TOMCAT_HONE%/CONF/SERVER.XML文件，在<host></host>节点下添加以下内容：

xml 代码

2. <Context crossContext="true" debug="5" docBase="BBS"     
3.   path="/BBS" reloadable="true">     
4. <Resource name="jdbc/BBS"     
5. type="javax.sql.DataSource" auth="Container"     
6. driverClassName="com.mysql.jdbc.Driver" maxActive="100"     
7. maxIdle="30" maxWait="10000"     
8. url="jdbc:mysql://localhost:3306/userdb?autoReconnect=true"     
9. username="root" password="" />  
10. Context> 

2、修改工程下的WEB.XML文件，添加以下内容：

xml 代码

 

2. <resource-ref>  
3.     <description>JNDI DataSource Testdescription>  
4.     <res-ref-name>dbc/BBSres-ref-name>  
5.     <res-type>javax.sql.DataSourceres-type>  
6.     <res-auth>Containerres-auth>  
7.     <res-sharing-scope>Shareableres-sharing-scope>  
8.   resource-ref>  

3、将MySql驱动文件添加到%TOMCAT_HONE%/comman/lib目录下

4、进行代码编写

4.1、ConnectionPool类，实现数据库操作

import java.sql.*;
import javax.sql.DataSource;
import javax.naming.InitialContext;
public class ConnectionPool {
    public void doSomething() throws Exception{
        Connection conn = null;
        InitialContext ctx = new InitialContext();
        DataSource ds = (DataSource)ctx.lookup("java:comp/env/jdbc/BBS");
        Statement stmt = null;

        try{
            conn = ds.getConnection();

            stmt = conn.createStatement();
            stmt.execute("delete from user");
             stmt.execute("insert into user(uid,password,realName,gender,email,tel,question,validateCode,answer,loginNum) values('1','2','3',4,'5','6','7',8,'9',10)");
            stmt.close();
            stmt = null;
            conn.close();
            conn = null;
        }finally{
            if(stmt!=null){
                try{
                    stmt.close();
                }catch(SQLException sqle){

                }
                stmt = null;
            }

            if(conn != null){
                try{
                    conn.close();
                }catch(SQLException sqle){

                }
                conn = null;
            }
        }

    }

    public static void main(String args[]){
        try{
        new ConnectionPool().doSomething();}
        catch(Exception e){
            e.printStackTrace();
        }
    }
}

4.2、InsertServlet  servlet文件，实现调用数据库功能类并实现跳转

java 代码

import java.io.IOException;
import java.io.PrintWriter;

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


public class InsertServlet extends HttpServlet {

    /**
     * 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 {

        ConnectionPool pool = new ConnectionPool();
        try{
            pool.doSomething();
            request.setAttribute("success", "Success");

        }catch(Exception e){
            request.setAttribute("success", "failed");
            e.printStackTrace();
        }

        this.getServletContext().getRequestDispatcher("/index.jsp").forward(request, response);

    }

    /**
     * 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);
    }

}

4.3  index.jsp文件  进行简单的页面输出功能

 

jsp 代码

1.   
3. <!---->  
4.   
5. <!---->"-//W3C//DTD HTML 4.01 Transitional//EN">   
6.   
7.      
8.     "<!---->">   
9.        
10.        
11.     "pragma" content="no-cache">   
12.     "cache-control" content="no-cache">   
13.     "expires" content="0">       
14.     "keywords" content="keyword1,keyword2,keyword3">   
15.     "description" content="This is my page">   
16.     <!---->   
17.      
18.      
19.      
20.     <!---->   
21.      
22.   

 

5、多个web应用共享数据库连接池。

5.1、修改%TOMCAT_HONE%/CONF/SERVER.XML文件，在<host></host>节点下添加以下内容：

 

1. <Context path="/dbtest" docBase="dbtestweb" debug="5" reloadable="true" crossContext="true">  
2.       <ResourceLink name="jdbc/Tours" global="jdbc/Tours" type="javax.sql.DataSource"/> Context>   

此处用到了ResourceLink，连接全局的Resource