Java Web 应用—创建、发布及目录结构 -

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Java Web 应用—创建、发布及目录结构

博客分类：

Web Java 应用服务器 Servlet 配置管理

创建和发布Web应用

Java Web应用由一组静态HTML页、Servlet、JSP和其他相关的class组成。每种组件在Web应用中都有固定的存放目录。Web应用的配置信息存放在web.xml文件中。在发布某些组件（如Servlet）时，必须在web.xml文件中添加相应的配置信息

Web应用的目录结构

在classes以及lib子目录下，都可以存放Java类文件。在运行过程中，Tomcat的类装载器先装载classes目录下的类，再装载lib目录下的类。因此，如果两个目录下存在同名的类，classes目录下的类具有优先权

web.xml

    <?xml version="1.0" encoding="GB2312"?> 
    <!DOCTYPE web-app PUBLIC "-//Sun Microsystems,Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
    <web-app>

    <display-name>Sample Application</display-name>

    <description>
    This is a Sample Application
    </description>

    
    <filter>
    <filter-name>SampleFilter</filter-name>
    <filter-class>mypack.SampleFilter</filter-class>
    </filter>

    
    <filter-mapping>
    <filter-name>SampleFilter</filter-name>
    <url-pattern>*.jsp</url-pattern>
    </filter-mapping>

    
    <servlet>
    <servlet-name>SampleServlet</servlet-name>
    <servlet-class>mypack.SampleServlet</servlet-class>
    <init-param>
    <param-name>initParam1</param-name>
    <param-value>2</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
    </servlet>

    
    <servlet-mapping>
    <servlet-name>SampleServlet</servlet-name>
    <url-pattern>/sample</url-pattern>
    </servlet-mapping>

    
    <session-config>
    <session-timeout>30</session-timeout>
    </session-config>

    
    <welcome-file-list>
    <welcome-file>login.jsp</welcome-file>
    <welcome-file>index.htm</welcome-file>
    </welcome-file-list>

    
    <taglib>
    <taglib-uri>/mytaglib</taglib-uri>
    <taglib-location>/WEB-INF/mytaglib.tld</taglib-location>
    </taglib>

    
    <resource-ref>
    <description>DB Connection</description>
    <res-ref-name>jdbc/sampleDB</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
    </resource-ref>

    
    <Security-constraint>
    <web-resource-collection>
    <web-resource-name>sample appliction</web-resource-name>
    <url-pattern>/*</url-pattern>
    </web-resource-collection>
    <auth-constraint>
    <role-name>guest</role-name>
    </auth-constraint>
    </Security-constraint>

    
    <login-config>
    <auth-method>FORM</auth-method>
    <realm-name>
    Tomcat Server Configuration form-Based Authentication Area
    </realm-name>
    <form-login-config>
    <form-login-page>/login.jsp</form-login-page>
    <form-error-page>/error.jsp</form-error-page>
    </form-login-config>
    </login-config>

    
    <security-role>
    <description>
    The role that is required to log into the sample application
    </description>
    <role-name>guest</role-name>
    </security-role>
    </web-app>

    实例

    <?xml version="1.0" encoding="ISO-8859-1"?>
    <web-app
       xmlns="http://java.sun.com/xml/ns/j2ee"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
       version="2.4">

        <display-name>Praxislanguage Ams Recorder</display-name>

        <context-param>
            <param-name>globalScope</param-name>
            <param-value>default</param-value>
        </context-param>

        <context-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/red5-*.xml</param-value>
        </context-param>

        <context-param>
            <param-name>locatorFactorySelector</param-name>
            <param-value>red5.xml</param-value>
        </context-param>

        <context-param>
            <param-name>parentContextKey</param-name>
            <param-value>default.context</param-value>
        </context-param>

        <context-param>
            <param-name>webAppRootKey</param-name>
            <param-value>/amsRecorder</param-value>
        </context-param>

        <listener>
            <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
        </listener>

        <security-constraint>
            <web-resource-collection>
                <web-resource-name>Forbidden</web-resource-name>
                <url-pattern>/streams/*</url-pattern>
            </web-resource-collection>
            <auth-constraint/>
        </security-constraint>

    </web-app>