Tomcat中數據庫連接池如何設置與應用

發布時間：2021-11-01 10:06:41 來源：億速云閱讀：153 作者：小新欄目：MySQL數據庫

這篇文章主要介紹了Tomcat中數據庫連接池如何設置與應用，具有一定借鑒價值，感興趣的朋友可以參考下，希望大家閱讀完這篇文章之后大有收獲，下面讓小編帶著大家一起了解一下。

配置:Tomcat5.5+JEE(jsdk1.5)+WINXP

還是簡單的說一說文件配置:
1:修改%tomcat%/conf/server.xml在

后加如下內容.
<Resource
name="jdbc/DBPool" //數據源名稱
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;在后加
<ResourceLink
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

這樣配置就算差不多了.如果具體的還不懂可見上次發的文章.
4.寫一個程序測試.(寫一個WEB程序)
我的是Myeclipse 寫的程序,這里不能從電腦上貼圖真有點不方便(我想哭).
1:寫一個連接類:
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:寫一個Servlet:
其中有是用來連接數據庫和顯示查詢結果.
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號:"+rst.getInt("userid"));
out.println("
用戶名:"+com.test.ASSICTOGBR2312.trans(rst.getString("name")));
out.println("
地址:"+rst.getString("address" ));
out.println("
生日"+rst.getDate("year" ));
}
else{
out.println("沒有這個ID");
stmt.close();
}
}
catch(Exception e){
e.printStackTrace();
}
finally{ //一定要注意這里對數據庫的關閉不然
//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:寫一個JSP頁面:
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

<!--

--&gt

This is my JSP page.

4:其中有轉字,為了不顯示亂碼
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

<web-app version="2.4"
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: 其中數據庫結構如下:
數據庫名:hptest
表:userinf
用下面的命令建一個數據庫和表
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');

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