J2EE中web.xml的常用配置

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Web XML JSP EJB Servlet

列了J2EE中的一些xml配置，当然并不全。
---------------------------------------------------------------------------------------------------------------------------------
配置servlet映射关系：

<web-app>
   ......
   <servlet>
        <servlet-name>ServletName</servlet-name>
        <servlet-class>com.jj.ServletClass</servlet-class>
        
        <init-param>
            <param-name>parameterName</param-name>
            <param-value>parameterValue</param-value>
        </init-param>
    </servlet>

    <servlet-mapping>
        <servlet-name>ServletName</servlet-name>
        <url-pattern>/*.do</url-pattern>
    </servlet-mapping>
    ......
</web-app>
---------------------------------------------------------------------------------------------------------------------------------
配置监听器：

<web-app>
    ........
    <listener>
        <listener-class>com.jj.MyServletContextListener</listener-class>
    </listener>
    ........
</web-app>
---------------------------------------------------------------------------------------------------------------------------------
设置session超时：

<web-app>
    ........
    <session-config>
        
        <session-timeout>15</session-timeout>
    </session-config>
    ........
</web-app>
---------------------------------------------------------------------------------------------------------------------------------
配置应用上下文参数：

<web-app>
    ........
     <context-param>
        <param-name>parameterName</param-name>
        <param-value>parameterValue</param-value>
    </context-param>
    ........
</web-app>
---------------------------------------------------------------------------------------------------------------------------------
禁用scriptlet：

<web-app>
    ........
    <jsp-config>
        <jsp-property-group>
            <url-pattern>*.jsp</url-pattern>
            <scripting-invalid>true</scripting-invalid>
        </jsp-property-group>
    </jsp-config>
    ........
</web-app>
---------------------------------------------------------------------------------------------------------------------------------
忽略EL表达式语言：

<web-app>
    ........
    <jsp-config>
        <jsp-property-group>
            <url-pattern>*.jsp</url-pattern>
            <el-ignored>true</el-ignored>
        </jsp-property-group>
    </jsp-config>
    ........
</web-app>
---------------------------------------------------------------------------------------------------------------------------------
EL函数配置：

TLD(标记库描述文件)：
<taglib>
    <uri>DiceFunctions</uri>
    <function>
        <name>rollIt</name>
        <function-class>foo.DiceRoller</function-class>
        <function-signature>
            int rollDice()
        </function-signature>
    </function>
</taglib>

有函数的类：
package foo;
public class DiceRoller{
    public static int rollerDice(){
       return (int)((Math.random()*6)+1);
    }
}

JSP中调用
<%@ tiglib prefix="mine" uri="DiceFunctions" %>

<html><body>

${mine:rollIt()}

</body></html>
---------------------------------------------------------------------------------------------------------------------------------
定制错误页面：

根据异常类型定制错误页面：
<web-app>
    ......
    <error-page>
        <exception-type>java.lang.Throwable</exception-type>
        <location>/error.jsp</location>
    </error-page>
    ......
</web-app>

根据HTTP状态码定制错误页面：
<web-app>
    ......
    <error-page>
        <error-code>404</error-code>
        <location>/error.jsp</location>
    </error-page>
    ......
</web-app>
---------------------------------------------------------------------------------------------------------------------------------
定制标记：

tld：
<taglib>
    ......
    <tag>
        <name>loop</name>
        <tag-class>com.pandajj.tag.LoopTag</tag-class>
        
        <body-content>JSP</body-content>
        <attribute>
            <name>times</name>
            <required>true</required>
            <rtexpralue>true</rtexpralue>
        </attribute>
    </tag>
    ......
</taglib>
---------------------------------------------------------------------------------------------------------------------------------
定制欢迎页面：

<web-app>
    ......
    <welcome-file-list>
        <welcome-file>hello.html</welcome-file>
    </welcome-file-list>
    ......
</web-app>
---------------------------------------------------------------------------------------------------------------------------------
EJB相关和MIME映射：

<web-app>
    ......
    
    <ejb-local-ref>
        <ejb-ref-name>ejb/customer</ejb-ref-name>
        <ejb-ref-type>Entity</ejb-ref-type>
        <local-home>com.jj.CustomerHome</local-home>
        <local>com.jj.Customer</local>
    </ejb-local-ref>

    
    <ejb-ref>
        <ejb-ref-name>ejb/LocalCustomer</ejb-ref-name>
        <ejb-ref-type>Entity</ejb-ref-type>
        <home>com.jj.CustomerHome</home>
        <remote>com.jj.Customer</remote>
    </ejb-ref>

    
    <env-entry>
        <env-entry-name>rates/discountRate</env-entry-name>
        <env-entry-type>java.lang.Integer</env-entry-type>
        <env-entry-value>10</env-entry-value>
    </env-entry>

    
    <mime-mapping>
        <extension>mpg</extension>
        <mime-type>video/mpeg</mime-type>
    </mime-mapping>
    ......
</web-app>
---------------------------------------------------------------------------------------------------------------------------------
过滤器映射：

<web-app>
    ......
    <filter>
        <filter-name>FilterName</filter-name>
        <filter-class>com.jj.FilterClass</filter-class>
        <init-param>
            <param-name>parameterName</param-name>
            <param-value>parameterValue</param-value>
        </init-param>
    </filter>

    
    <filter-mapping>
        <filter-name>FilterName</filter-name>
        <url-pattern>*.do</url-pattern>
    </filter-mapping>

    
    <filter-mapping>
        <filter-name>FilterName</filter-name>
        <servlet-name>ServletName</servlet-name>
    </filter-mapping>
    ......
</web-app>
---------------------------------------------------------------------------------------------------------------------------------
授权：

<web-app>
    ......
    <security-role>
        
        <role-name>admin</role-name>
    </security-role>

    <login-config>
        
        <auth-method>BASIC</auth-method>
    </login-config>

    <security-constraint>
        <web-resource-collection>
            <web-resource-name>Web Security</web-resource-name>
            <url-pattern>/index.jsp</url-pattern>
            <http-method>GET</http-method>
        </web-resource-collection>
        <auth-constraint>
            <role-name>admin</role-name>
        </auth-constraint>
        <user-data-constraint>
            
            <transport-guarantee>CONFIDENTIAL</transport-guarantee>
        </user-data-constraint>
    </security-constraint>
    ......
</web-app>
---------------------------------------------------------------------------------------------------------------------------------
四种认证类型：

BASIC：HTTP规范，Base64
<web-app>
    ......
    <login-config>
        <auth-method>BASIC</auth-method>
    </login-config>
    ......
</web-app>

DIGEST:HTTP规范，数据完整性强一些，但不是SSL
<web-app>
    ......
    <login-config>
        <auth-method>DIGEST</auth-method>
    </login-config>
    ......
</web-app>

CLIENT-CERT：J2EE规范，数据完整性很强，公共钥匙（PKC）
<web-app>
    ......
    <login-config>
        <auth-method>CLIENT-CERT</auth-method>
    </login-config>
    ......
</web-app>

FORM：J2EE规范，数据完整性非常弱，没有加密，允许有定制的登陆界面。
<web-app>
    ......
    <login-config>
        <auth-method>FORM</auth-method>
        <form-login-config>
            <form-login-page>/login.jsp</form-login-page>
            <form-error-page>/error.jsp</form-error-page>
        </form-login-config>
    </login-config>
    ......
</web-app>

登陆页面表单的action，用户名，密码要用统一的名字：
<form action="j_security_check">
    <input type="text" name="j_username" />
    <input type="password" name="j_password" />
    <input type="submit" value="enter" />
</form>

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