【正文】 ache 等 Web服務(wù)器一樣，具有處理 HTML 頁面的功能，另外它還是一個 Servlet 和 JSP 容器，獨(dú)立的 Servlet 容器是 Tomcat 的默認(rèn)模式。實(shí)際上 Tomcat 部分是 Apache 服務(wù)器的擴(kuò)展，但它是獨(dú)立運(yùn)行的，所以當(dāng)你 Apache Tomcat 運(yùn)行時，它實(shí)際上作為一個與Apache 獨(dú)立的進(jìn)程單獨(dú)運(yùn)行的。 Tomcat 是一個輕量級應(yīng)用服務(wù)器，在中小型系統(tǒng)和并發(fā)訪問用戶不是很多的場合下被普遍使用，是開發(fā)和調(diào)試 JSP 程序的首選。目前最新版本是 。由于有了 Sun 的參與和支持，最新的 Servlet 和 JSP 規(guī)范總是能在 Tomcat 中得到體現(xiàn)， Tomcat 5 支持最新的 Servlet 和 JSP 規(guī)范。s participation and support, the new Servlet code and JSP code can always be reflected in Tomcat Tomcat5, support for the latest Servlet JSP 2norm . Because Tomcat technology advanced, stable performance, and free, so by the Java enthusiasts and has been the favorite part of software developers approbate, bee the popular Web application server. Tomcat is the majority of programmers love, because it runs system resource occupied by small, good scalability, load balance and support the mail service system development and application of monly used functions。s role is to admin. As the user of the existence of such, add a user ( change the code to make it more safe ): user name = admin password = deep_dark_secret roles = admin / when pleted these steps, please restart Tomcat, visit : / / localhost: 8080 / Admin, will see a login interface. Admin Web Application based on the container management security mechanism, and using the Jakarta Struts framework. As soon as the admin role of the user to log in to the admin interface, will be able to use this configuration management interface Tomcat. Manager Web Application let you through a than Admin Web Application more simple user interface, to perform some simple Web application tasks. Manager Web Application is defined in an automatic deployment file: CATALINA_BASE / webapps / . To edit this file, to ensure that the context docBase parameter is the absolute path, that is to say the CATALINA_HOME / server / webapps / Manager absolute path. If you are using UserDatabaseRealm, you need to add a role and a subscriber to the CATALINA_BASE / conf / file. Next, edit this file, add a manager role to the file: role name = manager also need to have a role as manager user. Like the existing users, add a new user ( change the code to make it more safe ): user name = manager password = deep_dark_secret roles = manager / and then restart Tomcat, visit : / / localhost / Manager / list, will see a very simple text management interface, or visit : / / localhost / Manager / HTML / list, will see a HMTL management interface. Either way it means you Manager Web Application has now started. Manager application may not have administrative privileges on the basis of system, the installation of a new Web application, for testing. If we have a new web application in the / home / user / hello in, and want to install it into / Hello, in order to test the application, can do so, the first file box / Hello ( as when accessing the path ), in the second text box input file: / home / user / Hello ( as Config URL ). Manager application also allows the stop, restart, removal and to deploy a web application. To stop an application so that it can not be accessed, when users try to access this is stopped when applied, will see a 503 error 503 This application is not currently available. Removes a web application from Tomcat, refers only to run copy deleted this application, if the restart Tomcat, deleted applications will appear again ( ., removed and is not removed from the hard disk ). There are two ways to deploy web services in the system. 1 copy the WAR file or web application folder ( including the all the content of the web ) to $CATALINA_BASE / webapps directory. 2 Web service establish a includes only the context content XML clip file, and the file in the $CATALINA_BASE / webapps directory. The application of web itself can be stored on the hard drive of any place. If there is a WAR file, want to deploy it, only need to put the file simply copy to CATALINA_BASE / webapps directory can be, the document must be . War as the extension. Once the Tomcat listening to this file, it will ( default) to the package as a subdirectory, and the WAR file file name as a subdirectory names. Next, Tomcat will be built in the memory of a context, as in document set. Of course, other essential content, from the DefaultContext access. Deploying a web application is another way to write a Context fragment of XML file, and then the files are copied to the CATALINA_BASE / webapps directory. A Context segment is not a full XML file, but a context element, as well as the application of the corresponding description. This clip file is cut out from the context element, so this episode was named context fragments. Once you have set the realm and validation of the method, needs to carry on the actual user login process. Generally speaking, the user login system is a very troublesome thing, must try to reduce the number of user login validation. As a default, when a user first requests a protected resource, every web application would require the user to login. If running a number of web application, and every application need for a separate user authentication, it looks a bit like the user. Users don39。 and it continues to improve and perfect, any one interested programmers can change it or in which add new function. Tomcat is a lightweight application server, in the small and medium systems and concurrent access to the user not many occasions to be widely used, is to develop and debug JSP program of choice. For a beginner, can think so, as in a machine to configure Apache server, we can use it to respond to a HTML page access request. In fact Tomcat part of Apache server extensions, but it is run independently, so when you run tomcat, it actually acts as a Apache independent processes separately run. The trick here is that, when properly configured, Apache HTML page service, but To