Struts问题

空指针异常,某个对象为NULL
代码贴出来看看

解决方案 »

  1.   

    <%@ page contentType="text/html;charset=GB2312"%>
    <%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean"%> 
    <%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"%> <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>Insert title here</title>
    </head>
    <body>
    <html:form action="/login">
    name:<html:text property="username"/><html:errors property="username"/><br/>
    password:<html:password property="password"></html:password>
    <html:errors property="password"/><br/>
    <html:submit/>><html:cancel/></html:form></body>
    </html>
      

  2.   

    <html:text property="username"/>
    <html:password property="password">
    看到区别了吗,你标签用错了.检查下标签
    试下
      

  3.   

    好像只要用上<html:这相标签就出错
      

  4.   

    html后应该是类型,如TEXT,SUBMIT等,你用PASSWORD是错的吧,改完试下,注意/
      

  5.   

    web.mxl文件配置如下
    <?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE web-app
      PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
      "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
      <web-app>
      <servlet>
        <servlet-name>action</servlet-name>
        <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
        <init-param>
          <param-name>config</param-name>
          <param-value>/WEB-INF/struts-config.xml</param-value>
        </init-param>
        <init-param>
          <param-name>debug</param-name>
          <param-value>3</param-value>
        </init-param>
        <init-param>
          <param-name>detail</param-name>
          <param-value>3</param-value>
        </init-param>
        <load-on-startup>0</load-on-startup>
      </servlet>
      <servlet-mapping>
        <servlet-name>action</servlet-name>
        <url-pattern>*.do</url-pattern>
      </servlet-mapping>
      <!-- Struts Tag Library Descriptors -->
      <taglib>
        <taglib-uri>/tags/struts-bean</taglib-uri>
        <taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
      </taglib>  <taglib>
        <taglib-uri>/tags/struts-html</taglib-uri>
        <taglib-location>/WEB-INF/struts-html.tld</taglib-location>
      </taglib>  <taglib>
        <taglib-uri>/tags/struts-logic</taglib-uri>
        <taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
      </taglib>
    </web-app>
      

  6.   

    谢谢各位,问题解决了,是我自己搞错了,我把web.xml放在WEB-INF的上一级目录,现在把web.xml文件放在WEB-INF就好了