2. Servlet

  • 2.1. Servlet tutorial

    Servlet provides a component-based, platform-independent approach to creating web-based applications that is not limited by ...
    2025-10-25 13:33:42 UTC
  • 2.2. Servlet introduction

    2.2.1. What is Servlet? ¶ Java Servlet is a program that runs on a Web server or application server and acts as an in...
    2025-10-25 13:33:39 UTC
  • 2.3. Servlet environment settings

    The development environment is where you can develop, test, and run Servlet. Like any other Java program, you need to comp...
    2025-10-25 13:33:41 UTC
  • 2.4. Servlet lifecycle

    The Servlet life cycle can be defined as the whole process from creation to destruction. The following is the process that S...
    2025-10-25 13:33:40 UTC
  • 2.5. Servlet instance

    Servlet is the service HTTP request and implementation javax.servlet.Servlet the Java class of the interface. Web applic...
    2025-10-25 13:33:39 UTC
  • 2.6. Servlet form data

    In many cases, you need to pass some information, from the browser to the Web server, and eventually to the daemon. Browsers...
    2025-10-25 13:33:41 UTC
  • 2.7. Servlet client HTTP request

    When a browser requests a web page, it sends specific information to the Webserver that cannot be read directly because it i...
    2025-10-25 13:33:40 UTC
  • 2.8. Servlet server HTTP response

    As discussed in the previous section, when an Web server responds to an HTTPrequest, the response usually includes a status ...
    2025-10-25 13:33:39 UTC
  • 2.9. Servlet HTTP status code

    The format of the HTTP request and HTTP response message is similar, and thestructure is as follows: Initial status line...
    2025-10-25 13:33:40 UTC
  • 2.10. Servlet authoring filter

    Servlet filters can dynamically intercept requests and responses to transform or use the information contained in the reques...
    2025-10-25 13:33:41 UTC
  • 2.11. Servlet exception handling

    When a Servlet throws an exception, the Web container uses the exception-type of the element web.xml search for conf...
    2025-10-25 13:33:40 UTC
  • 2.12. Servlet Cookie processing

    Cookie is a text file stored on the client computer and retains a variety oftracking information. Java Servlet clearly suppo...
    2025-10-25 13:33:42 UTC
  • 2.13. Servlet Session tracking

    HTTP is a “stateless” protocol, which means that every time a client retrieves a web page, the client opens a separate conne...
    2025-10-25 13:33:40 UTC
  • 2.14. Servlet database access

    This tutorial assumes that you already know how JDBC applications work. Before you begin to learn Servlet database access, p...
    2025-10-25 13:33:40 UTC
  • 2.15. Servlet file upload

    Servlet can be used with the HTML form tag to allow users to upload files tothe server. The uploaded file can be a text file...
    2025-10-25 13:33:41 UTC
  • 2.16. Servlet processing date

    One of the most important advantages of using Servlet is that you can use most of the methods available in the core Java. Th...
    2025-10-25 13:33:39 UTC
《地理信息系统原理、技术与方法》  97

最近几年来,地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持,如城市管理、区划、环境整治等等,地理信息成为信息时代重要的组成部分之一; “数字地球”概念的提出,更进一步推动了作为其技术支撑的GIS的发展。 与此同时,一些学者致力于相关的理论研究,如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面,并且这两个方面构成了相互促进的发展过程。