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配置:Tomcat5.5+JEE(jsdk1.5)+WINXP
还是简单的说一说文件配置:
1: 修改 %tomcat%/conf/server.xml 在
后加如下内容.
Resource
name= jdbc/DBPool // 数据源名称
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
这样配置就算差不多了. 如果具体的还不懂可见上次发的文章.
4. 写一个程序测试.(写一个 WEB 程序)
我的是 Myeclipse 写的程序, 这里不能从电脑上贴图真有点不方便 (我想哭).
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:
其中有是用来连接数据库和显示查询结果.
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 号: +rst.getInt(userid));
out.println(
用户名: +com.test.ASSICTOGBR2312.trans(rst.getString( name)));
out.println(
地址: +rst.getString(address));
out.println(
生日 +rst.getDate(year));
}
else{
out.println(没有这个 ID
stmt.close();
}
}
catch(Exception e){
e.printStackTrace();
}
finally{ // 一定要注意这里对数据库的关闭不然
// 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: 写一个 JSP 页面:
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.
print input search id:
4: 其中有转字, 为了不显示乱码
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: 其中数据库结构如下:
数据库名:hptest
表:userinf
用下面的命令建一个数据库和表
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
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