21天掌握J2EE：Sams Teach Yourself J2EE in 21 Days 教程与代码

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"《21天学通J2EE》是一本由Sams Publishing出版的电子书，旨在帮助读者在21天内掌握Java企业版（J2EE）技术。这本书由Martin Bond、Dan Haywood、Debbie Law、Andy Longshaw和Peter Roxburgh合作编写，于2002年首次印刷。书中涵盖了一系列J2EE相关的概念和技术，包括但不限于Servlets、JSP、EJB、JMS、JNDI等关键组件。" J2EE（Java 2 Platform, Enterprise Edition）是Java平台的一个版本，专为开发和部署企业级应用程序而设计。它提供了多种服务、API和协议，用于构建分布式、多层架构的应用。J2EE的主要目标是简化企业应用的开发，通过提供标准组件和模块化结构来提高可重用性和可维护性。本书《21天学通J2EE》的结构可能分为多个部分，逐步引导读者从基础到进阶学习J2EE技术。例如，前几章可能会介绍J2EE的基础知识，如Java编程基础和Web应用的基本架构。接着，会深入讲解Servlets和JSP，这是构建动态Web页面的基石。之后，可能涵盖Enterprise JavaBeans (EJB)技术，它是J2EE中处理业务逻辑的核心组件。此外，还会讨论JMS（Java Message Service）用于异步通信，以及JNDI（Java Naming and Directory Interface）用于服务发现和服务注册。在学习过程中，读者可以期待通过实际案例和练习来加深理解。这些案例和代码示例将帮助读者将理论知识应用到实践中，从而快速提升技能。同时，书中可能还涉及了开发和部署J2EE应用的工具，如应用服务器（如Tomcat或JBoss）的使用方法，以及如何进行性能优化和调试。值得注意的是，虽然书名宣称可以在21天内学通J2EE，但这并不意味着J2EE的所有方面都能在短短三周内完全掌握。J2EE是一个庞大的技术体系，需要持续学习和实践才能精通。然而，这本书提供了一个快速入门和系统学习的路径，对于初学者来说是一个很好的起点。《21天学通J2EE》是一本面向初学者的实用教程，涵盖了J2EE平台的关键技术和最佳实践，旨在帮助读者在短时间内建立起对J2EE的全面认识，并具备开发J2EE应用的基本能力。

Processing Tag Bodies ........................................................................................637

JavaServer Pages Standard Tag Library (JSPTL) ..............................................640

Using the JSPTL with the J2EE RI ..............................................................641

Using the JSPTL

forEach Tag ....................................................................643

Other JSPTL Tags ........................................................................................645

JSPTL Scripting Language ............................................................................645

Other Jakarta Tag Libraries ..........................................................................646

Summary ............................................................................................................647

Q&A ....................................................................................................................647

Exercise ..............................................................................................................648

WEEK 3 Integrating J2EE into the Enterprise 651

DAY 15 Security 653

Security Overview ..............................................................................................654

Security Terminology ....................................................................................654

Common Security Technology ..........................................................................656

Symmetric Encryption ..................................................................................656

Asymmetric Encryption ................................................................................658

SSL and HTTPS ............................................................................................659

Checksums and Digests ................................................................................660

Digital Certificates ........................................................................................660

Security in J2EE ................................................................................................661

J2EE Security Terminology ..........................................................................661

Working with J2EE RI Security ....................................................................663

Security and EJBs ..............................................................................................666

Defining EJB Security ..................................................................................666

Defining Roles ..............................................................................................666

Defining the Security Identity ......................................................................668

Defining Method Permissions ......................................................................670

Mapping Principals to Roles ........................................................................674

Using Roles as the Security Identity ............................................................676

Security in Web Applications and Components ................................................682

Web Authentication ......................................................................................683

Configuring J2EE RI Basic Authentication ..................................................684

Declarative Web Authorization ....................................................................685

Programmatic Web Authorization ................................................................691

Adding Programmatic Web Security to the Case Study ..............................692

Using Secure Web Authentication Schemes ................................................694

Security and JNDI ............................................................................................695

Simple LDAP Authentication ........................................................................696

SASL Authentication ....................................................................................696

xvi Sams Teach Yourself J2EE in 21 Days

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Contents xvii

Summary ............................................................................................................698

Q&A ....................................................................................................................699

Exercises ............................................................................................................699

AY 16 Integrating XML with J2EE 701

The Drive to Platform-Independent Data Exchange ..........................................702

Benefits and Characteristics of XML ............................................................703

Origins of XML ..................................................................................................703

Structure and Syntax of XML ............................................................................704

HTML and XML ..........................................................................................705

Structure of an XML Document ..................................................................705

Declarations ..................................................................................................706

Elements ........................................................................................................706

Well-Formed XML Documents ....................................................................708

Attributes ......................................................................................................708

Comments ......................................................................................................709

Creating Valid XML ..........................................................................................710

Document Type Definitions ..........................................................................710

Namespaces ..................................................................................................714

Enforcing Document Structure with an XML Schema ................................715

How XML Is Used in J2EE ..........................................................................718

Parsing XML ......................................................................................................718

The JAXP Packages ..........................................................................................720

Parsing XML using SAX ....................................................................................720

Document Object Model (DOM) Parser ..........................................................725

Modifying a DOM Tree ......................................................................................731

Java Architecture for XML Binding ..................................................................732

Differences Between JAXP and JAXB ........................................................733

Extending the Agency Case Study ....................................................................734

Step 1—Change Session Beans ....................................................................735

Step 2—Amend the

MessageSender Helper Class ........................................736

Step 3—Amend the

ApplicantMatch Message-Driven Bean ......................737

Summary ............................................................................................................739

Q&A ....................................................................................................................739

Exercises ............................................................................................................740

AY 17 Transforming XML Documents 741

Presenting XML to Clients ................................................................................742

Presenting XML to Browsers ........................................................................743

Extensible Stylesheet Language (XSL) ........................................................744

XSL-FO XSL Formatting Objects ................................................................744

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Extensible Stylesheet Transformations (XSLT) ................................................745

Applying Stylesheets ....................................................................................746

Storing Transformed Documents on the Server ............................................746

Presenting XML Documents and Stylesheets to the Client ..........................747

Transforming the XML Document on the Server ........................................747

Using XALAN with J2EE ..................................................................................748

Transforming XML Documents with XALAN ............................................749

Using XALAN from the Command Line ....................................................750

Using XSLT in Java Applications ....................................................................751

XSLT Stylesheets ................................................................................................755

Template Rules ..............................................................................................756

Text Representation of XML Elements ......................................................761

Using XPath with XSLT ................................................................................762

Default Stylesheet Rules ..............................................................................764

Processing Attributes ....................................................................................765

Using Stylesheet Elements ................................................................................767

Processing Whitespace and Text ..................................................................767

Adding Comments ........................................................................................769

Attribute Values ............................................................................................770

Creating and Copying Elements ....................................................................771

Attributes and Attribute Sets ........................................................................774

Additional XSL Elements ............................................................................777

XSLT Compilers ................................................................................................780

Summary ............................................................................................................781

Q&A ....................................................................................................................782

Exercises ............................................................................................................782

AY 18 Patterns 787

J2EE Patterns ......................................................................................................788

What Are Patterns? ........................................................................................788

Why Use Patterns? ........................................................................................790

Types of Patterns ..........................................................................................790

J2EE Patterns ................................................................................................791

Pattern Catalogs ............................................................................................792

Applying J2EE-Specific Patterns ......................................................................792

Applying Patterns in a Context ....................................................................793

Generic Patterns ............................................................................................794

J2EE Presentation-Tier Patterns ....................................................................795

J2EE Business-Tier Patterns ..........................................................................795

J2EE Integration-Tier Patterns ......................................................................796

Patterns Within J2EE ....................................................................................797

xviii Sams Teach Yourself J2EE in 21 Days

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Contents xix

Patterns in Context ..............................................................................................797

Analysing the Case Study ............................................................................797

Session Facades and Entity EJBs ..................................................................798

Data Exchange and Value Objects ................................................................800

Data Access Without Entity EJBs ................................................................804

Messages and Asynchronous Activation ......................................................811

Composing an Entity ....................................................................................812

Composing a JSP ..........................................................................................813

JSPs and Separation of Concerns ..................................................................817

Client-Side Proxies and Delegates ................................................................820

Locating Services ..........................................................................................821

Any Other Business ......................................................................................822

Refactoring the Case Study ..........................................................................822

Directions for J2EE Patterns ..............................................................................823

Summary ............................................................................................................824

Q & A ..................................................................................................................824

Exercises ............................................................................................................825

AY 19 Integrating with External Resources 827

Reviewing External Resources and Legacy Systems ........................................828

Introducing Connector Architecture ..................................................................829

Overview of the Architecture ........................................................................829

Roles and Responsibilities ............................................................................830

Using the Common Client Interface ..................................................................834

Interacting with an EIS ..................................................................................834

Installing a Resource Adapter ......................................................................835

Creating a First CCI Application ..................................................................836

Managing Transactions and Exploring Records ..........................................843

Introducing Other Connectivity Technologies ....................................................848

Introducing CORBA ..........................................................................................849

Introducing Java IDL ..........................................................................................851

Using RMI over IIOP ........................................................................................851

RMI over JRMP Example ............................................................................852

RMI over IIOP Example ..............................................................................857

Introducing JNI ..................................................................................................860

Evaluation of Integration Technologies ..............................................................865

Summary ............................................................................................................865

Q&A ....................................................................................................................866

Exercises ............................................................................................................867

AY 20 Using RPC-Style Web Services with J2EE 869

Web Service Overview ......................................................................................870

What Is a Web Service? ................................................................................870

Why Use Web Services? ..............................................................................872

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Web Service Technologies and Protocols ....................................................873

Web Service Architecture ..............................................................................873

Web Services for J2EE ......................................................................................875

J2EE Web Service Architecture ....................................................................875

Tools and Technologies ................................................................................876

Integrating Web Services with Existing J2EE Components ........................878

Using an RPC-style SOAP-Based Web Service ................................................879

RPC-Oriented Web Services ........................................................................880

Setting up Axis under Tomcat 4.0 ................................................................881

Service Description Information ..................................................................883

Anatomy of a WSDL Document ..................................................................883

Creating a Java Proxy from WSDL ..............................................................885

Calling the Web Service Through SOAP ......................................................889

A Half-Way House ........................................................................................891

Debugging a SOAP Interaction ....................................................................892

Implementing an RPC-Style SOAP-Based Web Service ..................................894

Wrapping up a Java class as a Web Service ..................................................894

A Client for Your Web Service ......................................................................898

Starting from WSDL ....................................................................................900

Using Axis JWS files ....................................................................................903

Session Context and Web Services ..............................................................905

Wrapping Existing J2EE Functionality as Web Services ............................909

Parameter Types and Type Mapping ..................................................................911

Mapping Between Java and SOAP/WSDL Types ........................................911

Mapping Complex Types with Serializers ....................................................912

Going Further with Complex Type Mapping ................................................919

Summary ............................................................................................................919

Q&A ....................................................................................................................920

Exercises ............................................................................................................921

AY 21 Web Service Registries and Message-Style Web Services 923

Registries for Web Services ................................................................................924

What is a Web Service Registry? ..................................................................924

Why Do I Need One? ....................................................................................924

How Do They Work? ....................................................................................925

Types of Registry ..........................................................................................925

ebXML Registry and Repository ..................................................................926

UDDI Overview ............................................................................................928

Accessing Information in a UDDI Registry ......................................................929

Manipulating Service Information using UDDI4J ........................................929

Manipulating Service Information Using the IBM WSTK Client API ........932

Retrieving and Using Service Information ..................................................933

xx Sams Teach Yourself J2EE in 21 Days

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