web程序出现异常时实现页面跳转

在web.xml配置文件下配置跳转页面

<!-- 异常跳转页面 -->
    <error-page>    
        <error-code>403</error-code>    
        <location>/error-404.html</location>    
    </error-page>    
    <error-page>    
        <error-code>404</error-code>    
        <location>/error-404.html</location>    
    </error-page>    
    <error-page>    
        <error-code>405</error-code>    
        <location>/error-404.html</location>    
    </error-page>    
    <error-page>    
        <error-code>500</error-code>    
        <location>/error-404.html</location>    
    </error-page>  
    <error-page>    <!--也可以指定异常类型（空指针等）-->
        <exception-type>java.lang.Exception</exception-type>  
        <location>/error-404.html</location>    
    </error-page>