网格环境中文件传输服务的研究与实现*

论述了利用Java CoG Kit实现网格中的文件传输服务客户端的图形化界面,提供了高性能、可靠的网格环境中的文件传输服务,它具有支持基础安全机制、客户-服务传输、第三方控制传输等功能,剖析了GridFTP,详细介绍了基于网格环境中的文件传输服务实例。     

Java CoG Kits在GridFTP开发中的应用

通过对Java CoG Kits软件包的研究,介绍了Java CoG Kits的结构和GridFTP的特性,讨论了Java CoG Kits中用于开发GridFTP客户端的FTP包的组件层次和类库,描述了GridFTP客户端类库用于编写GridFTP应用的函数,研究了GridFTP第三方控制数据传输模型,给出了实现的过程和步骤,最后基于Java CoG Kits设计实现了GridFTP第三方控制数据传输。     

Java CoG Kits在GridFFP开发中的应用

通过对Java CoG Kits软件包的研究,介绍了Java CoG Kits的结构和GridFTP的特性,讨论了Java CoG Kits中用于开发GridFrP客户端的FTP包的组件层次和类库,描述了GridFTP客户端类库用于编写GridFlP应用的函数,研究了GridFTP第三方控制数据传输模型,给出了实现的过程和步骤,最后基于Java CoG Kits设计实现了GridFTP第三方控制数据传输.     

Java CoG Kits在GridFTP开发中的应用

通过对Java CbG Kits软件包的研究,介绍了Java CoG Kits的结构和GridFTP的特性,讨论了Java CoG Kits中用于开发GridFTP客户端的FrP包的组件层次和类库,描述了GndFTP客户端类库用于编写GridFTP应用的函数,研究了GridFTP第三方控制数据传输模型,给出了实现的过程和步骤,最后基于Java CoG Kits设计实现了GridFTP第三方控制数据传输。     

CoG软件包技术与应用

CoG软件包的目标是研究商品化分布式计算技术如何与网格应用桥接起来,论文主要通过阐述CORBA技术与现有网格构架集成方法,介绍了CoG软件包的技术与应用。     

Java安装与配置技巧

Java的核心是JDK（Java Development Kit）。JDK不仅包含了java的开发工具和基础类库,还包括了java的运行环境JRE（Java Runtime Environment）。目前使用的JDK的版本都是在JDK1．2版本之上的J2SDK（Java2 Software Development Kit）,而通常学生实验所使用的JDK是J2SE（Java2 Platform,Standard Edition）。本文在实践的基础以J2SE1．4．2版本为例详述了Java及相关软件的安装与配置技巧。     

HTML·Mosaic·Java——Internet上的三大发明

Internet的应用开发是当前的热点。Sun公司推出的面向对象的跨平台编程语言Java已成为工业界最欢迎的Internet编程语言。Sun公司不失时机地推出了Java Compiler编译器、Java Developer’s Kit开发工具和Hot Java 浏览器,更使许多Internet大厂商热情倍增,愿为Java的进一步发展推波助澜。这里介绍的一组文章有助于您了解Java的重要性和广阔发展前景。     

JDK 1.2更安全

Sun公司计划于今年晚些时候推出一个新的Java安全模型,这一模型不仅增强了Java的安全特性,而且还可使这一程序设计语言在商业应用中具有更大的灵活性。作为即将推出的Java开发程序包——Java Development Kit(JDK)1.2的一部分,Sun将对其现存的Java安全模型加以扩充,以进一步提高Java应用开发人员对其PC资源的存取能力。这一扩展行为,旨在平息开发商和系统管理人员对Java安全特性的批评,即许多开发商和系统管理人员认为Java当前的安全策略极不     

新技术追踪

JBuilder 8新特性 Borland公司在2002年11月份发布了JBuilder的新版本JBuilder 8。Borland公司在Java开发工具市场上一直占有领先的地位,其产品可以满足不同层次开发者的需求,JBuilder 8不仅支持JDK(Java Development Kit)1.4.1版本规范,Borland Web Services Kit for Java也集成到该版本中。另外,JBuilder 8还增加了对Jakarta Struts的支持,让目标管理和调     

Java也加密

Sun公司1月12日宣布,美国和加拿大的用户现可立即免费下载其最新的Java Cryptography Extension软件包(JCE 1.2)的初级版本。 JCE 1.2软件包是Java Development Kit软件(JDKTM)的一个标准扩展,带有一个综合性的加密工具。作为先进的基于Java的加密技术,它创建了一组标准的应用编程接口(AP1)。下一个版本的Java开发工具软件的安全模型内核可提供基于授权的Java小应用程序和应用访问控制,即:可为不同的用户分     

A grid middleware for distributed Java computing with MPI binding and process migration supports

“Grid” computing has emerged as an important new research field. With years of efforts, grid researchers have successfully developed grid technologies including security solutions,resource management protocols, information query protocols, and data management services. How-ever, as the ultimate goal of grid computing is to design an infrastructure which supports dynarnic,cross-organizational resource sharing, there is a need of solutions for efficient and transparent task re-scheduling in the grid. In this research, a new grid middleware is proposed, called G-JavaMPI. This middleware adds the parallel computing capability of Java to the grid with the support of a Grid-enabled message passing interface (MPI) for inter-process communication between Java processes executed at dif-ferent grid points. A special feature of the proposed G-JavaMPI is the support of Java process migration with post-migration message redirection. With these supports, it is possible to migrate executing Java process from site to site for continuous computation, if some site is scheduled to be turned down for system reconfiguration. Moreover, the proposed G-JavaMPI middleware is very portable since it requires no modification of underlying OS, Java virtual machine, and MPI package. Preliminary performance tests have been conducted. The proposed mechanisms have shown good migration efficiency in a simulated grid environment.     

基于JSF的网格门户设计与实现

网格门户在推广网格应用中起了重要作用,但网格门户在诸多方面如功能和表现能力等仍有待完善.引入JavaServerFaces （JSF）这一新的Web框架,设计和实现了一个网格门户.利用JSF的表现能力提供了一个更为丰富的、集成的、易操作并且可定制的用户接口.并且由于JSF与其它Java技术、底层的网格技术实现无缝的衔接,实现了平台无关的、强大的网格资源管理及动态配置功能,同时使系统具有更强的可扩展性.     

Internationalization support in Java

This article presents new technology in Java that gives developers the power to produce commercial-grade internationalized software. The Java environment, that is, the Java programming language, VirtualMachine, and Java Development Kit (JDK), provides a more elegant, robust, comprehensive scheme for creating global software than any other platform in widespread use today     

SIG框架基于多线程技术分布式系统的任务调度

空间信息网格是利用网格技术实现空间信息资源的共享、管理和提供空间信息服务的系统和各种的空问信息服务的基础设施,任务调度是分布式系统和网格系统最具有挑战的问题之一,Java语言里的多线程机制很好地解决了这一问题。该文主要研究了SIG中的任务调度技术,通过实验确定分布式系统里的线程数目,使系统性能获得局部最优。     

JAVA2安全机制与实例研究

Java语言是Internet时代最流行的一种编程语言。然而在当今网络时代,病毒和黑客肆虐,人们对信息安全性的要求越来越高。为满足Java用户日益增长的安全需求。Java的开发商SUN公司在其新推出的Java2平台中,内建了基于策略文件的安全机制,该机制对不同来源的类代码授予不同的系统资源访问权限,从而降低了恶意Java代码的非法访问所带来的危害。本文将结合关于Applet安全的实例来探讨Java2平台中的安全机制。     

JAVACAM: trimming Java down to size

JavaCam is an embedded sensor device that connects to the Internet and operates with as little as 1.5 Mbytes of total system memory. To determine how small a Java system we could build that would still support a Java Virtual Machine, we wrote the Java Nanokernel, a very thin operating system. We then ported Sun's Java Development Kit 1.0.1 to JN. This port included the complete Java language and all of the core Java packages except java.awt. In this article, we begin by describing JN and the port of JDK 1.0.1 to it. We then describe our first significant application, JavaCam, a camera that is remotely programmable in Java and Internet accessible     

Compiling Java just in time

The Java programming language promises portable, secure execution of applications. Early Java implementations relied on interpretation, leading to poor performance compared to compiled programs. Compiling Java programs to the native machine instructions provides much higher performance. Because traditional compilation would defeat Java's portability and security, another approach is necessary. This article describes some of the important issues related to just-in-time, or JIT, compilation techniques for Java. We focus on the JIT compilers developed by Sun for use with the JDK (Java Development Kit) virtual machine running on SPARC and Intel processors. (Access the Web at www.sun. com/workshop/java/jit for these compilers and additional information.) We also discuss performance improvements and limitations of JIT compilers. Future Java implementations may provide even better performance, and we outline some specific techniques that they may use