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mashiguang — Mon, 14 Jul 2008 08:35:00 GMT

调用ejb�?如果客户端和ejb不在同一个jvm,��p��讄��InitialContext,不同的应用服务器InitialContext写法也不�?
Context.INITIAL_CONTEXT_FACTORY:指定到目录服务的�q�接工厂
Context.PROVIDER_URL:目录服务提供者URL

//jboss:
Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory"
Context.URL_PKG_PREFIXES, "org.jboss.naming"
Context.PROVIDER_URL, "localhost:1099"

//weblogic:
Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory"
Context.PROVIDER_URL, "t3://localhost:7001"

//apusic(金蝶):
Context.INITIAL_CONTEXT_FACTORY, "com.apusic.jndi.InitialContextFactory"
Context.PROVIDER_URL, "rmi://localhost:6888"

//WebSphere:
Context.INITIAL_CONTEXT_FACTORY, "com.ibm.websphere.naming.WsnInitialContextFactory"
Context.PROVIDER_URL, "iiop://localhost:900"

//J2EE SDK(J2EE RI):
Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.cosnaming.CNCtxFactory"
Context.PROVIDER_URL, "iiop://127.0.0.1:1050"

//SilverStream:
Context.INITIAL_CONTEXT_FACTORY, "com.sssw.rt.jndi.AgInitCtxFactory"
Context.PROVIDER_URL, "sssw://localhost:80"

//OC4J:
Context.INITIAL_CONTEXT_FACTORY, "com.evermind.server.rmi.RMIInitialContextFactory"
Context.PROVIDER_URL, "ormi://127.0.0.1/"

//WAS5:
Context.INITIAL_CONTEXT_FACTORY, "com.ibm.websphere.naming.WsnInitialContextFactory"
Context.PROVIDER_URL, "iiop://localhost:2809"

常用JNDI服务提供者连接工�?
Filesystem:  Com.sun.jndi.fscontext.FSContextFactory或者com.sun.jndi.fscontext.RefFSContextFactory
LDAPv3:    Com.sun.jndi.ldap.LdapCtxFactory
NDS:     com.novell.naming.service.nds.NdsInitialContextFactory
NIS:     com.sun.jndi.nis.NISCtxFactory
RMI registry: com.sun.jndi.rmi.registry.RegistryContextFactory
IBM LDAP服务提供�?   com.ibm.jndi.LDAPCtxFactory
BEA 名字服务提供�?   weblogic.jndi.WLInitialContextFactory
JBOSS名字服务提供�?  org.jnp.interfaces.NamingContextFactory

mashiguang 2008-07-14 16:35 发表评论

mashiguang — Thu, 13 Dec 2007 09:03:00 GMT

自JDK1.0开始就存在包装器类,但是在JDK5.0之前,必须手工地插入打包和拆包的代�?
JDK5.0中就有了自动打包功能,但在5.0中自动打包时存在一些差�?刚才看《java核心技术第7版》时才发�?

代码1:

Integer a=1000;
Integer b=1000;
System.out.println(a==b);//false

代码2:

Integer a=100;
Integer b=100;
System.out.println(a==b);//true

代码3:

Integer a=new Integer(100);
Integer b=new Integer(100);
System.out.println(a==b);//false

�W�一�D�代码不成立,而第二段代码成立的原因是:自动打包
自动打包规范要求boolean,byte,char≤127,介于-128→127之间的short和int被包装到固定的对象中.
打包和拆包是�~�译器认可的�Q�而不是虚拟机�Q�编译器在生成类的字节码�Ӟ��插入必要的方法调用，虚拟机只是执行这些字节码�?/p>

�W�三�D�代码不用多说肯定不成立.

mashiguang 2007-12-13 17:03 发表评论

ant打ear包的详细步骤

mashiguang — Fri, 23 Nov 2007 16:44:00 GMT

摘要: 用一个简单的ejb3.0�C�Z��记录ant打ear包的�q�程源码下蝲环境: apache-ant-1.6.5 jboss-4.2.1.GA jboss-annotations-ejb3.jar jboss-ejb3.jar jboss-ejb3x.jar 最后三个包在jboss里有. 1,建ejb3.0��目 session bean接口:HelloWorld pub... 阅读全文

mashiguang 2007-11-24 00:44 发表评论

apache commons-email

mashiguang — Thu, 01 Nov 2007 08:51:00 GMT

使用commons mail旉��要的jar�?
1,commons-email-1.1.jar
2,mail.jar
3,activation.jar
(在web应用里只需要commons-email�?

发送简单的文字邮�g:

SimpleEmail email = new SimpleEmail();

email.setHostName("smtp.sina.com");
email.setAuthentication("username", "password");//在邮件服务商处注册的用户名和密码
email.addTo("mailTo@163.com");
email.setFrom("username@sina.com", "alias");

email.setCharset("UTF-8");//gbk或gb2312,只要支持中文��p��
email.setSubject("title");
email.setMsg("content");
email.send();

发送带附�g的邮�?

// Create the attachment
EmailAttachment attachment = new EmailAttachment();
attachment.setPath("mypictures/john.jpg");
attachment.setDisposition(EmailAttachment.ATTACHMENT);
attachment.setDescription("Picture of John");
attachment.setName("John");

// Create the email message
MultiPartEmail email = new MultiPartEmail();
email.setHostName("mail.myserver.com");
email.setAuthentication("username", "password");
email.addTo("jdoe@somewhere.org", "John Doe");
email.setFrom("me@apache.org", "Me");
email.setCharset("UTF-8");
email.setSubject("The picture");
email.setMsg("Here is the picture you wanted");

// add the attachment
email.attach(attachment);

// send the email
email.send();

创徏多个EmailAttachment对象,�q�调用MultiPartEmail.attach();��可以发送多个附�?

发送HTML格式的邮�?

发送html格式的邮件和��单邮件的区别��在创徏HtmlEmail对象
�q�用email.setHtmlMsg(String)或email.setMsg(String)把含有html标签的字�W�串赋给email对象.
HtmlEmail对象�q�有一个setTextMsg(String)�Ҏ��,�q�个�Ҏ��参数里的html标签会被当做普通字�W�处�?不会被解析成html元素.
更详�l�内容可以看apache commons-email的用��h��?/a>.

mashiguang 2007-11-01 16:51 发表评论

<�?gt;,防止��h��/后退引�v的重复提交问题的Java Token代码�Q�非Struts

mashiguang — Tue, 21 Aug 2007 03:45:00 GMT

贴子转自http://hi.baidu.com/bobylou�Q��{之前�q�没有验证文章里的方法是不是有效�Q�估计原作者把它放到blog之前应该做过��试了吧�?br>

Struts本��n有一套完善的防止重复提交表单�?strong>Token(令牌)机制�Q�但�W�者目前的��目自写的framework没有用到Struts�Q�故也得自写防止用户因�ؓ后退或者刷新来重复提交表单内容的Token机制。不难，�Ҏ��实现�?/p>

实现原理�Q�一致性。jsp生成表单�Ӟ��在表单中插入一个隐�?lt;input>字段�Q�该字段��是保存在页面端的token字符�Ԍ��同时把该字符串存入session中。等到用��h��交表单时�Q�会一�q�提交该隐藏的token字符丌Ӏ�在服务器端�Q�查看下是否在session中含有与该token字符串相�{�的字符丌Ӏ�如果有�Q�那么表明是�W�一�ơ提交该表单�Q�然后删除存放于session端的token字符�Ԍ��再做正常业务逻辑��程�Q�如果没有，那么表示该表单被重复提交�Q�做非正常流�E�处理，可以警告提示也可以什么也不做�?/p>

看代码�?/p>

首先�?strong>Token�ȝ��。类很简单，而且主要�Ҏ��都给doc注释�?/p>

/*
* blog: http://hi.baidu.com/bobylou
* $Revision: 1.1 $
* $Date: 2007/07/18 10:02:55 $
* $Author: bobrow$
*/

package com.paizuo.framework.util;

import java.util.ArrayList;

import javax.servlet.http.HttpSession;

public class Token {

    private static final String TOKEN_LIST_NAME = "tokenList";

    public static final String TOKEN_STRING_NAME = "token";

    private static ArrayList getTokenList(HttpSession session) {
       Object obj = session.getAttribute(TOKEN_LIST_NAME);
       if (obj != null) {
          return (ArrayList) obj;
       } else {
          ArrayList tokenList = new ArrayList();
          session.setAttribute(TOKEN_LIST_NAME, tokenList);
          return tokenList;
       }
    }

    private static void saveTokenString(String tokenStr, HttpSession session) {
       ArrayList tokenList = getTokenList(session);
       tokenList.add(tokenStr);
       session.setAttribute(TOKEN_LIST_NAME, tokenList);
    }

    private static String generateTokenString(){
       return new Long(System.currentTimeMillis()).toString();
    }

    /**
     * Generate a token string, and save the string in session, then return the token string.
     *
     * @param HttpSession
     *            session
     * @return a token string used for enforcing a single request for a particular transaction.
     */
    public static String getTokenString(HttpSession session) {
       String tokenStr = generateTokenString();
       saveTokenString(tokenStr, session);
       return tokenStr;
    }

    /**
     * check whether token string is valid. if session contains the token string, return true.
     * otherwise, return false.
     *
     * @param String
     *            tokenStr
     * @param HttpSession
     *            session
     * @return true: session contains tokenStr; false: session is null or tokenStr is id not in session
     */
    public static boolean isTokenStringValid(String tokenStr, HttpSession session) {
       boolean valid = false;
       if(session != null){
          ArrayList tokenList = getTokenList(session);
          if (tokenList.contains(tokenStr)) {
             valid = true;
             tokenList.remove(tokenStr);
          }
       }
       return valid;
    }
}

怎么使用�Q?/font>

在jsp��面端�?/strong>

首先import该类�Q?/p>
<%@ page import="com.paizuo.framework.util.Token" %>

表单包含隐藏的token字符�?

<form>

<input type="hidden" name="<%=Token.TOKEN_STRING_NAME %>" value="<%=Token.getTokenString(session) %>">

form>

在Server端action中进行检验�?/strong>

if(Token.isTokenStringValid(request.getParameter(Token.TOKEN_STRING_NAME), request.getSession())){
//�q�行正常业务��程
}
else{
//�q�行防重复提交处理流�E?/span>
}

完毕�?/p>

mashiguang 2007-08-21 11:45 发表评论

servlet使用技�?�l�臃肿的web.xml瘦��n.

mashiguang — Fri, 06 Jul 2007 11:17:00 GMT
      以往每添加一个servlet��p��在web.xml里添�?lt;servlet>,随着��目的进�?servlet数目��来��可�?
web.xml里也密密麻麻的排满了�q�些食之无味弃之崩溃的东�?有一�U�方法可以改善这�U�境�?
      在web.xml里添加如下的配置:
    <servlet>
        <servlet-name>InvokerServletservlet-name>
        <servlet-class>
          org.apache.catalina.servlets.InvokerServlet
        servlet-class>
        <init-param>
            <param-name>debugparam-name>
            <param-value>0param-value>
        init-param>
        <load-on-startup>-1load-on-startup>
    servlet>

    <servlet-mapping>
        <servlet-name>InvokerServletservlet-name>
        <url-pattern>/servlet/*url-pattern>
    servlet-mapping>
      ok,现在web.xml里保留这一个servlet配置��可以满��x��有的servlet调用�?比如调用UserManagerService�q�个servlet,在页面表单里�q�样�?
<form name="f" method="post" action="/servlet/com.mashiguang.servlet.UserManagerService">
      <input/>
      <submit/>
form>
      注意表单action "/servlet/"后面是这个servlet class的全�?

mashiguang 2007-07-06 19:17 发表评论