About the Eclipse Web Tools Platform Project in Java

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CHAPTER 2 About the Eclipse Web Tools Platform Project
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A server can be associated with a Web application development project This lets us extend the Run As command to execute HTML files and other artifacts on the server When you select an HTML file and invoke the Run As Run on Server command, the file gets published to the associated server, the server gets started, and the Web browser gets opened with the URL of the file on the server
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WST includes an Internet subsystem that adds several useful tools Obviously, when working with Web applications it is handy to have a Web browser Of course, you can configure Eclipse to open an external Web browser, but having one that is integrated into Eclipse as a editor component is simpler and more convenient WST originally contained a Web browser plug-in, but since this component was useful in other contexts, the Help system for example, WTP contributed this to the Eclipse platform In the course of developing Web applications, tools may have to access URLs on the Internet For example, you may want to search external Universal Description, Discovery, and Integration (UDDI) registries for Web services, or you may want to validate XML files using remote Document Type Definitions (DTD) or XML Schemas (XSD) This poses a problem for Eclipse because Eclipse is itself a Java application, and Java applications access remote URLs using classes in the javanet package that must be configured properly to negotiate any proxies that may come between you and the Internet WST contributes a Preference page that lets you specify the proxy settings used by Eclipse Debugging Web applications adds some new complexities such as HTTP sessions, cookies, and XML Web service messages You may need to view the HTTP traffic that you send or receive in order to understand what s happening or going wrong WST provides a TCP/IP monitor that lets you capture and view the messages sent to and received from a specified port and host The TCP/IP monitor also lets you save the messages in an XML log file that can be analyzed by the WS-I Test Tools Another notable feature of Web applications is that they contain many XML artifacts, such as XHTML documents and J2EE deployment descriptors, whose structure is defined by schemas (DTDs or XSDs) Some of these schemas are provided with WTP, but others must be retrieved from remote servers Clearly, retrieving a schema from a remote server is a costly operation, so the WTP Internet tools include a cache, technically referred to as a caching URI resolver, that stores retrieved schemas locally The cache is preconfigured with some key schemas and you can add others to it
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The Structure of WTP
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Web application development involves many source formats in addition to Java WST provides the Structured Source Editor (SSE) framework for developing new editors and includes source editors for HTML, XHTML, Cascading Stylesheets (CSS), JavaScript, XML, DTD, XSD, and Web Service Description Language (WSDL) SSE is primarily designed to simplify the creation of source editors for languages in the HTML and XML families It provides an extended Document Object Model (DOM) that is tailored for the requirements of editors SSE provides all the usual forms of programmer assistance that Eclipse users have become accustomed to for editing Java source files These include syntax coloring, code completion, error highlighting (red squiggles), error markers, and formatting
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As mentioned in the preceding section, WST contains a full set of source editors for Web page development All the main source formats used in Web page development are supported HTML and XHTML, JavaScript, and CSS These editors are built on the SSE framework and are designed to be used as the source tab of multi-tab editors or to be further extended For example, the JSP editor provided in the JST subproject extends the HTML editor Other projects could extend the HTML editor to support additional source formats such as PHP Web pages are treated as executable artifacts and can be launched using the Run As Run on Server command Web pages are also subject to validation For example, link checking will be added in future versions of WTP
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