jspdebug史上最全webxml设置装备摆设文件元素详解小白看过来

一、web.xml配置文件常用元素及其意义预览

1 <web-app> 2 3  4 <display-name></display-name> 5 6  7 <description></description> 8 9 10 <context-param></context-param>11 12 13 <filter></filter>14 15 16 <filter-mapping></filter-mapping>17 18 20 <listener></listener>21 22 24 <servlet></servlet>25 26 29 <servlet-mapping></servlet-mapping>30 31 33 <session-config></session-config>34 35 36 <mime-mapping></mime-mapping>37 38 39 <welcome-file-list></welcome-file-list>40 41 42 <error-page></error-page>43 44 46 <taglib></taglib>47 48 49 <resource-env-ref></resource-env-ref>50 51 52 <resource-ref></resource-ref>53 54 55 <security-constraint></security-constraint>56 57 58 <login-config></login-config>59 60 62 <security-role></security-role>63 64 65 <env-entry></env-entry>66 67 68 <ejb-ref></ejb-ref>69 70 71 <ejb-local-ref></ejb-local-ref>72 73 </web-app>

二、各个配置元素详解

1.Web运用图标：指出IDE和GUI工具用来表示Web运用的大图标和小图标

jspdebug史上最全webxml设置装备摆设文件元素详解小白看过来 RESTful API

1 <icon> 2 <small-icon>/images/app_small.gif</small-icon> 3 <large-icon>/images/app_large.gif</large-icon> 4 </icon>

2.Web 运用名称：供应GUI工具可能会用来标记这个特定的Web运用的一个名称

<display-name>Tomcat Example</display-name>

3.Web 运用描述：给出于此干系的解释性文本

<desciption>Tomcat Example servlets and JSP pages.</desciption>

4.高下文参数：声明运用范围内的初始化参数

1 <context-param>2 <param-name>参数名</para-name>3 <param-value>参数值</param-value>4 <description>参数描述</description>5 </context-param>

在servlet里面可以通过 getServletContext().getInitParameter(“context/param”)得到

5.过滤器配置：将一个名字与一个实现javaxs.servlet.Filter接口的类干系联

1 <filter> 2 <filter-name>setCharacterEncoding</filter-name> 3 <filter-class>com.myTest.setCharacterEncodingFilter</filter-class> 4 <init-param> 5 <param-name>encoding</param-name> 6 <param-value>GB2312</param-value> 7 </init-param> 8 </filter> 9 <filter-mapping>10 <filter-name>setCharacterEncoding</filter-name>11 <url-pattern>/</url-pattern>12 </filter-mapping>

6.监听器配置

1 <listener>2 <listerner-class>org.springframework.web.context.ContextLoaderListener</listener-class>3 </listener>

7.Servlet配置

1 <servlet> 2 <servlet-name>servlet名称</servlet-name> 3 <servlet-class>servlet类全路径</servlet-class> 4 <init-param> 5 <param-name>参数名</param-name> 6 <param-value>参数值</param-value> 7 </init-param> 8 <run-as> 9 <description>Security role for anonymous access</description>10 <role-name>tomcat</role-name>11 </run-as>12 　 <load-on-startup>指定当Web运用启动时，装载Servlet的次序</load-on-startup>13 </servlet>14 <servlet-mapping>15 <servlet-name>servlet名称</servlet-name>16 <url-pattern>映射路径</url-pattern>17 </servlet-mapping>

8.会话超时配置（单位为分钟）

1 <session-config>2 <session-timeout>120</session-timeout>3 </session-config>

9.MIME类型配置

1 <mime-mapping>2 <extension>htm</extension>3 <mime-type>text/html</mime-type>4 </mime-mapping>

10.指定欢迎文件页配置

1 <welcome-file-list>2 <welcome-file>index.jsp</welcome-file>3 <welcome-file>index.html</welcome-file>4 <welcome-file>index.htm</welcome-file>5 </welcome-file-list>

11.配置缺点页面

(1).通过缺点码来配置error-page

1 2 <error-page>3 <error-code>404</error-code>4 <location>/NotFound.jsp</location>5 </error-page>

(2).通过非常的类型配置error-page

1 2 <error-page>3 <exception-type>java.lang.NullException</exception-type>4 <location>/error.jsp</location>5 </error-page>

12.TLD配置

1 <taglib>2 <taglib-uri>http://jakarta.apache.org/tomcat/debug-taglib</taglib-uri>3 <taglib-location>/WEB-INF/jsp/debug-taglib.tld</taglib-location>4 </taglib>

如果开拓工具一贯在报错,该当把<taglib> 放到 <jsp-config>中

1 <jsp-config>2 <taglib>3 <taglib-uri>http://jakarta.apache.org/tomcat/debug-taglib</taglib-uri>4 <taglib-location>/WEB-INF/pager-taglib.tld</taglib-location>5 </taglib>6 </jsp-config>

13.资源管理工具配置

1 <resource-env-ref>2 <resource-env-ref-name>jms/StockQueue</resource-env-ref-name>3 </resource-env-ref>

14.资源工厂配置

1 <resource-ref>2 <res-ref-name>mail/Session</res-ref-name>3 <res-type>javax.mail.Session</res-type>4 <res-auth>Container</res-auth>5 </resource-ref>

配置数据库连接池就可在此配置

1 <resource-ref>2 <description>JNDI JDBC DataSource of shop</description>3 <res-ref-name>jdbc/sample_db</res-ref-name>4 <res-type>javax.sql.DataSource</res-type>5 <res-auth>Container</res-auth>6 </resource-ref>

15.安全限定配置

1 <security-constraint> 2 <display-name>Example Security Constraint</display-name> 3 <web-resource-collection> 4 <web-resource-name>Protected Area</web-resource-name> 5 <url-pattern>/jsp/security/protected/</url-pattern> 6 <http-method>DELETE</http-method> 7 <http-method>GET</http-method> 8 <http-method>POST</http-method> 9 <http-method>PUT</http-method>10 </web-resource-collection>11 <auth-constraint>12 <role-name>tomcat</role-name>13 <role-name>role1</role-name>14 </auth-constraint>15 </security-constraint>

16.上岸验证配置

1 <login-config>2 <auth-method>FORM</auth-method>3 <realm-name>Example-Based Authentiation Area</realm-name>4 <form-login-config>5 <form-login-page>/jsp/security/protected/login.jsp</form-login-page>6 <form-error-page>/jsp/security/protected/error.jsp</form-error-page>7 </form-login-config>8 </login-config>

17.安全角色：security-role元素给出安全角色的一个列表，这些角色将涌如今servlet元素内的security-role-ref元素的role-name子元素中。

分别地声明角色可使高等IDE处理安全信息更为随意马虎。

1 <security-role>2 <role-name>tomcat</role-name>3 </security-role>

18.Web环境参数：env-entry元素声明Web运用的环境项

1 <env-entry>2 <env-entry-name>minExemptions</env-entry-name>3 <env-entry-value>1</env-entry-value>4 <env-entry-type>java.lang.Integer</env-entry-type>5 </env-entry>

19.EJB 声明

1 <ejb-ref>2 <description>Example EJB reference</decription>3 <ejb-ref-name>ejb/Account</ejb-ref-name>4 <ejb-ref-type>Entity</ejb-ref-type>5 <home>com.mycompany.mypackage.AccountHome</home>6 <remote>com.mycompany.mypackage.Account</remote>7 </ejb-ref>

20.本地EJB声明

1 <ejb-local-ref>2 <description>Example Loacal EJB reference</decription>3 <ejb-ref-name>ejb/ProcessOrder</ejb-ref-name>4 <ejb-ref-type>Session</ejb-ref-type>5 <local-home>com.mycompany.mypackage.ProcessOrderHome</local-home>6 <local>com.mycompany.mypackage.ProcessOrder</local>7 </ejb-local-ref>

三、总结

以上便是常用的web.xml中元素的配置以及浸染了，欢迎提出异议和不适当的地方共同学习。