学习的时候，由于自己没在意，碰到了html标签和struts1标签混用出错的情况。
index.jsp
<body>
<a href="login2.do">登陆(struts标签)</a><br>
</body>
struts-config.xml
<action path="/login2"
forward="/login_use_struts_tag.jsp"
></action>
<action path="/loginusetag"
type="com.tangjian.action.LoginAction"
name="loginForm"
>
<forward name="success" path="/login_success.jsp"/>
<forward name="error" path="/login_use_struts_tag.jsp"/>
</action>
login_use_struts_tag.jsp
<body> <h1>用户登陆-使用struts标签保持数据</h1> <hr> <form action="loginusetag.do" method="post"> 用户名：<html:text property="username"/><br> 密 码：<html:password property="password" value=""/><br> <input type="submit" value="提交"> </form> </body>
运行之后，报了如下错误：
严重: Servlet.service() for servlet jsp threw exception javax.servlet.jsp.JspException: Cannot find bean: "org.apache.struts.taglib.html.BEAN" in any scope at org.apache.struts.taglib.TagUtils.lookup(TagUtils.java:935) at org.apache.struts.taglib.html.BaseFieldTag.prepareValue(BaseFieldTag.java:121) at org.apache.struts.taglib.html.BaseFieldTag.renderInputElement(BaseFieldTag.java:102) at org.apache.struts.taglib.html.BaseFieldTag.doStartTag(BaseFieldTag.java:81) at org.apache.jsp.login_005fuse_005fstruts_005ftag_jsp._jspx_meth_html_005ftext_005f0(login_005fuse_005fstruts_005ftag_jsp.java:100) at org.apache.jsp.login_005fuse_005fstruts_005ftag_jsp._jspService(login_005fuse_005fstruts_005ftag_jsp.java:68) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:679) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:461) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:399) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301) at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085) at org.apache.struts.action.RequestProcessor.internalModuleRelativeForward(RequestProcessor.java:1023) at org.apache.struts.action.RequestProcessor.processForward(RequestProcessor.java:572) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:221) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) at javax.servlet.http.HttpServlet.service(HttpServlet.java:627) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:873) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689) at java.lang.Thread.run(Thread.java:619) 2010-1-11 0:17:22 org.apache.catalina.core.StandardWrapperValve invoke
一开始报错后，总感觉没错。
到最后把使用的标签全部换成struts的运行了下才好了。也就是把form标签也改成struts的标签。
更改的login_use_struts_tag.jsp
<body> <h1>用户登陆-使用struts标签保持数据</h1> <hr> <html:form action="loginusetag.do" method="post"> 用户名：<html:text property="username"/><br> 密 码：<html:password property="password" value=""/><br> <input type="submit" value="提交"> </html:form> </body>
为什么html标签和struts的标签不能混用的原因没有去深究，只是给自己提个醒：以后页面尽量不要使用不同风格的标签，这样感觉应该不会错吧！