tomcat5.5.17+jstl1.2+servlet2.5+jsp2.1配置

landril — Fri, 06 Jul 2007 05:35:00 GMT

tomcat5.5.17+jstl1.2+servlet2.5+jsp2.1配置

在此我��用的环境是：
tomcat5.5.17
jstl1.2
servlet2.5
jsp2.1

我以一个简单的例子hello1来说明吧�Q�发布工�E�时最重要的就是目录结构了�Q�hello1是根目录�Q�放在tomcat中的webapps里，先看看目录结构：
hello1\index.jsp
hello1\response.jsp
hello1\WEB-INF\lib\javaee.jar
hello1\WEB-INF\lib\jsf-api.jar
hello1\WEB-INF\lib\jsf-impl.jar
hello1\WEB-INF\lib\jstl-1.2.jar
hello1\WEB-INF\web.xml

如果你按照以上目录发布工�E�，抛出以下异常�Q?br>(1) java.lang.NoClassDefFoundError: javax/el/ExpressionFactory
(2) 或打开��面后显�C�：

HTTP Status 404 - /hello1/

type Status report

message /hello1/

description The requested resource (/hello1/) is not available.

Apache Tomcat/5.5.17

则将javaee.jar包再copy一份放在tomcat目录的common\lib下就不会了�?br>关于用到的javaee.jar、jsf-api.jar、jsf-impl.jar、jstl-1.2.jar�q�四个包可以通过myeclipse中获得，如果你安装了myeclipse5.5的话�Q�我安装的是MyEclipse 5.5.1 GA�Q�这四个包的所在的目录是：MyEclipse 5.5.1 GA\eclipse\plugins\com.genuitec.eclipse.j2eedt.core_5.5.1\data\libraryset\EE_5\

到此�Q�再�l�出具体的文件代码吧�?br>(1) hello1\index.jsp

<%@ taglib uri="
<%@ taglib uri="

Hello

Hello, my name is Duke. What's yours?

<%@include file="response.jsp" %>

(2) hello1\response.jsp

Hello, ${param.username}!

(3) hello1\WEB-INF\web.xml

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee web-app_2_5.xsd"
version="2.5">

  hello1
  *.jsp
  false
  false
  false

成功之后��面昄��为：

Hello, my name is Duke. What's yours?

Hello, afdfadsfads!

landril 2007-07-06 13:35 发表评论

landril — Sat, 28 Apr 2007 13:33:00 GMT

会话跟踪技�?/span>--session的��?/span>

会话跟踪�Q?/span>

1�?nbsp;使用隐藏表单字段

2�?nbsp;URL重写

http://host/path/file.jsp?sessionid=landril

3�?nbsp;持久Cookie

4�?nbsp;会话HttpSession

一�?/span>使用session的简单步�?/span>

获取HttpSession�Q?/span>request.getSession()�Ҏ(gu��)��Q�对象，查找与该会话相关的信息（session.getAttribute()�Q�，存储会话中的信息�Q?/span>session.setAttribute()�Q�，删除会话中的数据�Q?/span>session.removeAttribute()�Q�，删除当前会话�Q?/span>session.invalidate()�Q?/span>

�?/span>session中，可以存储��L��数量的键值对�Q�通过键即可获取相应的��|��即��用：session.getAttribute(“key”);�?/span>

二�?/span>session的常用方�?/span>

1�?nbsp;getAttribute()�Q�从session中获取以前存储的�?/span>

2�?nbsp;getAttributeNames()�Q�返�?/span>session中所有属性的名称

3�?nbsp;setAttribute()�Q�将键与值关联�v来，存储�q?/span>session

4�?nbsp;removeAttribute()�Q�删�?/span>session中存储的对应键的�?/span>

5�?nbsp;invalidate()�Q�删除整�?/span>session及其存储的键�?/span>

6�?nbsp;logout()�Q�注销当前用户

7�?nbsp;getId()�Q�获取每�?/span>session对应的唯一ID

8�?nbsp;getCreationTime()�Q�获�?/span>session创徏的时�?/span>

9�?nbsp;getLastAccessedTime()�Q�获�?/span>session最后被讉K��的时�?/span>

10�?span> getMaxInactiveInterval()�Q�在用户没有讉K��的情况下�Q�会话在被自动废弃之前应该保持多长时�?/span>

三�?/span>使用session的一个例子，拥有购物车的在线商店

1�?/span>CatalogPage.java

package com.landril.session;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class CatalogPage extends HttpServlet {

private CatalogItem[] items;

private String[] itemIds;

private String title;

protected void setItems(String[] itemIds) {

this.itemIds = itemIds;

items = new CatalogItem[itemIds.length];

for (int i = 0; i < items.length; i++) {

items[i] = Catalog.getItem(itemIds[i]);

}

protected void setTitle(String title) {

this.title = title;

}

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

if(items == null){

response.sendError(response.SC_NOT_FOUND,"Missing Items:");

return;

}

response.setContentType("text/html");

PrintWriter out = response.getWriter();

out.println(""+title+"

"+title+"

");

CatalogItem item;

for (int i = 0; i < items.length; i++) {

out.println("

");

item = items[i];

if(item == null)

out.println("Unknow itemId: "+itemIds[i]);

else{

out.println();

String formURL = request.getContextPath()+"/orderPage";

formURL = response.encodeURL(formURL);

out.println("

}

2�?/span>ComputerBook.java

package com.landril.session;

public class ComputerBook extends CatalogPage{

public void init(){

String[] ids = {"book1","book2","book3","book4"};

setItems(ids);

setTitle("Japanese Book");

}

3�?/span>JapaneseBook.java

package com.landril.session;

public class JapaneseBook extends CatalogPage{

public void init(){

String[] ids = {"book5","book6"};

setItems(ids);

setTitle("Computer Book");

}

4�?/span>OrderPage.java

package com.landril.session;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

public class OrderPage extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

HttpSession session = request.getSession();

ShoppingCart cart;

synchronized(session){

cart = (ShoppingCart)session.getAttribute("shop");

if(cart == null){

cart = new ShoppingCart();

session.setAttribute("shop", cart);

}

String itemId = request.getParameter("itemId");

if(itemId != null){

String num = request.getParameter("num");

if(num == null)

cart.addItem(itemId);

else{

int numItems;

try {

numItems = Integer.parseInt(num);

} catch (NumberFormatException e) {

numItems = 1;

}

cart.setNum(itemId, numItems);

}

response.setContentType("text/html");

PrintWriter out = response.getWriter();

String title = "Your Order";

out.println(""+title+"

"+title+"

");

synchronized(session){

List itemOrders = cart.getItemOrders();

if(itemOrders.size() == 0)

out.println("No items");

else{

out.println("

Item ID	Short Description	Long Description	Unit Price	Number	Total Price"); ItemOrder order; for (int i = 0; i < itemOrders.size(); i++) { order = (ItemOrder)itemOrders.get(i); out.println("
"+order.getItemId()+"	"+order.getSDesc()+"	"+order.getLDesc()+"	"+order.getUnitPrice()+"	"); out.println(" "); out.println(""); out.println("	"); out.println(order.getTotalPrice()); } String checkURL = response.encodeURL(request.getContextPath()+"/check.html"); out.println("

Item ID

Short Description

Long Description

Unit Price

Number

Total Price");

ItemOrder order;

for (int i = 0; i < itemOrders.size(); i++) {

order = (ItemOrder)itemOrders.get(i);

out.println("

"+order.getItemId()+"

"+order.getSDesc()+"

"+order.getLDesc()+"

"+order.getUnitPrice()+"

");

out.println("

");

out.println(order.getTotalPrice());

}

String checkURL = response.encodeURL(request.getContextPath()+"/check.html");

out.println("

}

5�?/span>ShoppingCart.java

package com.landril.session;

import java.util.ArrayList;

import java.util.List;

public class ShoppingCart {

private List<ItemOrder> itemOrders;

public ShoppingCart() {

itemOrders = new ArrayList<ItemOrder>();

}

public List<ItemOrder> getItemOrders(){

return itemOrders;

}

public synchronized void addItem(String itemId){

ItemOrder order;

for(int i=0;i<itemOrders.size();i++){

order = (ItemOrder)itemOrders.get(i);

if(itemId.equals(order.getItemId())){

order.addNum();

return;

}

ItemOrder newOrd = new ItemOrder(Catalog.getItem(itemId));

itemOrders.add(newOrd);

}

public synchronized void setNum(String itemId,int num){

ItemOrder order;

for (int i = 0; i < itemOrders.size(); i++) {

order = (ItemOrder)itemOrders.get(i);

if(itemId.equals(order.getItemId())){

if(num <=0)

itemOrders.remove(i);

else

order.setNum(num);

}

return;

}

ItemOrder newOrd = new ItemOrder(Catalog.getItem(itemId));

itemOrders.add(newOrd);

}

6�?/span>CatalogItem.java

package com.landril.session;

public class CatalogItem {

private String itemId;

private String sDesc;

private String lDesc;

private float price;

public String getItemId() {

return itemId;

}

public void setItemId(String itemId) {

this.itemId = itemId;

}

public String getLDesc() {

return lDesc;

}

public void setLDesc(String desc) {

lDesc = desc;

}

public float getPrice() {

return price;

}

public void setPrice(float price) {

this.price = price;

}

public String getSDesc() {

return sDesc;

}

public void setSDesc(String desc) {

sDesc = desc;

}

public CatalogItem(String itemId, String desc, String desc2, float price) {

super();

this.itemId = itemId;

sDesc = desc;

lDesc = desc2;

this.price = price;

}

7�?/span>ItemOrder.java

package com.landril.session;

public class ItemOrder {

private CatalogItem item;

private int num;

public ItemOrder(CatalogItem item) {

setItem(item);

setNum(1);

}

public CatalogItem getItem() {

return item;

}

public void setItem(CatalogItem item) {

this.item = item;

}

public int getNum() {

return num;

}

public void setNum(int num) {

this.num = num;

}

public String getItemId() {

return item.getItemId();

}

public String getSDesc() {

return item.getSDesc();

}

public String getLDesc() {

return item.getLDesc();

}

public float getUnitPrice() {

return item.getPrice();

}

public void addNum() {

setNum(num + 1);

}

public void cancelOrder() {

setNum(0);

}

public float getTotalPrice() {

return num * getUnitPrice();

}

8�?/span>Catalog.java

package com.landril.session;

public class Catalog {

private static CatalogItem[] items = {

new CatalogItem("book1", "Hibernate", "Hibernate�Q?/span>Hibernate", 57),

new CatalogItem("book2", "Spring", "Spring�Q?/span>Spring", 36),

new CatalogItem("book3", "Tomcat", "Tomcat�Q?/span>Tomcat", 23),

new CatalogItem("book4", "Jboss", "Jboss�Q?/span>Jboss", 35),

new CatalogItem("book5", "Japanese1", "Japanese1�Q?/span>Japanese1", 35),

new CatalogItem("book6", "Japanese2", "Japanese2�Q?/span>Japanese2", 23) };

public static CatalogItem getItem(String itemId) {

CatalogItem item;

if (itemId == null)

return null;

for (int i = 0; i < items.length; i++) {

item = items[i];

if (itemId.equals(item.getItemId()))

return item;

}

return null;

}

9�?/span>check.html

<html>

<head>

<title>checking outtitle>

head>

<body>

Checking out

body>

landril 2007-04-28 21:33 发表评论

Servlet基础知识及常用类

landril — Sat, 28 Apr 2007 13:32:00 GMT

Servlet基础知识及常用类

一�?/span>Servlet生命周期

服务器加�?/span>Servlet�Q�创�?/span>Servlet�cȝ��实例�Q�调�?/span>Servlet�?/span>init()�Ҏ(gu��)��Q�处理客��L��的服务调用（如果收到��h��Q�调�?/span>service()�Ҏ(gu��)��Q?/span>service()�Ҏ(gu��)��处理��h��q�将�l�果�q�回客户端，�{�待下一下请求，重复�Q�，Servlet在服务器调用destroy()�Ҏ(gu��)��后被卸蝲

二�?/span>会话跟踪技�?/span>

1�?nbsp;使用隐藏表单字段

2�?nbsp;URL重写

http://host/path/file.jsp?sessionid=landril

3�?nbsp;持久Cookie

4�?nbsp;会话HttpSession

ServletRequest�Q�用于将��h��的信息传送给Servlet

ServletResponse�Q�提供服务器对客��L��h��的响�?/span>

RequestDispatcher�Q�接收用��L��的请求�ƈ��其发送到��M��资源�Q?/span>RequestDispatcher对象用作资源的封装器�Q�通过路径或名�U�指�?/span>

ServletConfig�Q�定�?/span>Servlet配置对象�Q�可以从web.xml文�g中获取初始化参数的��g��及对ServletContext对象的引�?/span>

ServletContext�Q�让Servlet查找有关Servlet引擎及其环境的信�?/span>

landril 2007-04-28 21:32 发表评论

landril — Tue, 10 Apr 2007 04:37:00 GMT

Cookie的��?/span>

一�?/span>cookie的作�?/span>

在我们��^常写�?/span>B/S�E�序中，会经常用�?/span>cookie�Q�主要有以下一些作用：

1�?nbsp;记录用户名和密码

以及该用户需要保存的一些信息，如购物购站，使用cookie�Q�可以让用户自动��d��到站点等�?/span>

2�?nbsp;定制站点

可以使用cookie来记录用��L��偏好�?/span>

3�?nbsp;定向�q�告

可以使用cookie来记录用记经常访问的主题�Q��ƈ向他们显�C�Z��q�些主题相关的广告�?/span>

二�?/span>向客��L��序发�?/span>cookie

1�?nbsp;创徏cookie对象

Cookie c = new Cookie(“userId”,”landril”);

2�?nbsp;讄��最大时效，默认�?/span>cookie是存储在��览器的内在中，用户关闭��览器则被删除，下面的方法是��?/span>cookie存储在硬盘上�?/span>

c.setMaxAge(60*60*24);//一天，如果讄��?/span>0则是删除�?/span>cookie

3�?nbsp;��?/span>cookie攑օ��?/span>HTTP响应报头�Q�可以��?/span>HttpServletResponse�?/span>addCookie�Ҏ(gu��)��Q�此�Ҏ(gu��)��不修改之前指定的Set-Cookie报头�Q�而是创徏新的报头�?/span>

response.addCookie(c);

注意�Q�设�|?/span>cookie的步骤�ؓ创徏cookie对象�Q�设�|�最大时效，��?/span>cookie攑օ�响应报头�Q�即发送到客户�E�序�Q�记住一定要��?/span>cookie发送到客户�E�序

三�?/span>从客��L��d��cookie

1�?nbsp;调用HttpServletRequest�?/span>getCookies得到一�?/span>Cookie对象的数�l?/span>

2�?nbsp;�Ҏ(gu��)��l�进行��@环，调用cookie�?/span>getName�Ҏ(gu��)��Q�获取具体的cookie的�?/span>

Cookie[] cookies = request.getCookies();

if(cookies != null){

for(int i=0;i

Cookie c = cookies[i];

if(“userId”.equals(c.getName())){

System.out.println(c.getValue());

}

四�?/span>cookie的常用方�?/span>

1�?nbsp;setComment()/getComment()�Q�指定或查找与该cookie相关的注�?/span>

2�?nbsp;setDomain()/getDomain()�Q�设�|�或��d��?/span>cookie适用的域

3�?nbsp;setMaxAge()/getMaxAge()�Q�操�?/span>cookie保留的时��_��多长旉��后过�?/span>

4�?nbsp;getName()�Q�读�?/span>cookie的名�U?/span>

5�?nbsp;setPath()/getPath()�Q�设�|�或取得cookie适用的�\�?/span>

cookie.setPath(“/”);指定服务器的所有页面都应该收到�?/span>cookie

6�?nbsp;setSource()/getSource()�Q�指�?/span>cookie是否只能通过加密�q�接�Q?/span>SSL�Q?/span>

默认false�Q�表�C?/span>cookie适用所有连�?/span>

7�?nbsp;setValue()/getValue()�Q�指定或获取cookie的�?/span>

五�?/span>使用cookie

1�?/span>RepeatServlet.java

public class RepeatServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

boolean newa = true;

Cookie[] cookies = request.getCookies();

if(cookies != null){

for (int i = 0; i < cookies.length; i++) {

Cookie c = cookies[i];

if ((c.getName().equals("repeat")) && (c.getValue().equals("true"))) {

newa = false;

break;

}

String title;

if (newa) {

Cookie rtn = new Cookie("repeat"," true");

rtn.setMaxAge(60*60*24*365);

response.addCookie(rtn);

title = "First Welcome";

} else {

title = "Welcom Back";

}

response.setContentType("text/html");

PrintWriter out = response.getWriter();

out.println("

");

out.println(title);

out.println("

");

}

public void doPose(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doGet(request,response);

}

2�?/span>CookieUtil.java

public class CookieUtil{

public static String getValue(HttpServletRequest request,String cName,String value){

Cookie[] cookies = request.getCookies();

if(cookies != null){

for (int i = 0; i < cookies.length; i++) {

Cookie cookie = cookies[i];

if (cName.equals(cookie.getName())) {

return cookie.getValue();

}

return value;

}

public static Cookie getCookie(HttpServletRequest request,String cName){

Cookie[] cookies = request.getCookies();

if(cookies != null){

for (int i = 0; i < cookies.length; i++) {

Cookie cookie = cookies[i];

if (cName.equals(cookie.getName())) {

return cookie;

}

return null;

}

3�?/span>AccessCountServle.java 记录讉K��?/span>

public class AccessCountServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

String acount = CookieUtil.getValue(request, "acc", "1");

int count = Integer.parseInt(acount);

Cookie cookie = new Cookie("acc",String.valueOf(count+1));

cookie.setMaxAge(60*60*24*365);

response.addCookie(cookie);

response.setContentType("text/html");

PrintWriter out = response.getWriter();

out.println("Hello,the number is

");

out.println(count);

out.println("

");

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doGet(request,response);

}

landril 2007-04-10 12:37 发表评论

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tomcat5.5.17+jstl1.2+servlet2.5+jsp2.1配置

HTTP Status 404 - /hello1/

Apache Tomcat/5.5.17

Hello, my name is Duke. What's yours?

Hello, ${param.username}!

Hello, my name is Duke. What's yours?

Hello, afdfadsfads!

"+title+"

"+title+"

Servlet基础知识及常用类

"); out.println(title); out.println("

"); out.println(count); out.println("

");

out.println(title);

out.println("

");

out.println(count);

out.println("