struts 中 bean:write的问题

<logic:present name="personbean" scope="request">
       <h2>
         Hello <bean:write name="personbean" property="userName" />!<p>
       </h2>
</logic:present>这个东西应该对应的哪个类啊？

解决方案 »

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用那个FORM提交，就对应那个FROMBEAN。
personbean类里面你设置什么变量，并且有get方法，就显示什么内容
<logic:present name="personbean" scope="request">
       <h2>
         Hello <bean:write name="personbean" property="userName" />!<p>
       </h2>
</logic:present>不在FORM里面，我就是想从类中得到数据，谢谢personbean这个类就是class下可是我没有得到数据啊，如果我把这个类放到包里，那又该怎么写啊？
personbean 只是个名字而已对应的是范围在request中存在的变量，至于这个变量所对应的类型需要你自己去编辑比如：存在一个bean 名字叫Bean1,你要把他存到request中，那就Bean1 bean=new Bean1(); 假设它有个属性userName,bean.setUserName("onray");request.setAttribute("personbean",bean); 然后你就可以用<logic:present name="personbean" scope="request">
       <h2>
         Hello <bean:write name="personbean" property="userName" />!<p>
       </h2>
</logic:present>
最主要的是要放进request请求中，request.setAttribute("personbean",personbean);
你看的孙玉琴的书？hello.jsp通过这个名为"personbean"的属性key来读取PersonBean对象这个personbean是一个属性key，在Constants.java中有定义，public static final String PERSON_KEY="personbean";
是从网上的来的，代码是自己写的能不能把整个personbean的代码给我，以及怎么调用啊？
package hello;import javax.servlet.http.HttpServletRequest;import java.sql.SQLException;
import java.util.ArrayList;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import hello.personbeanForm;public final class personbeanAction extends Action  {     public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception
{
  personbeanForm pb = new personbeanForm();
  String userName = pb.getUserName();
  if ((userName==null) || (userName.compareTo("")==0))
  userName = "ok";

  request.setAttribute("userName", userName);

  request.setAttribute("personbean",pb);    return (mapping.findForward("Testok"));
}

}javabean就这么写的啊，
<logic:present name="personbean" scope="request">
       <h2>
         <bean:message key="hello.jsp.page.hello"/>
         <bean:write name="personbean" property="userName" />!<p>
       </h2>
    </logic:present>
hello.jsp总是出不来，运气正常，没有错误
userName = "ok";
=>pb.setUserName("ok");
还是出不来，郁闷<logic:present name="personbean" scope="request">
       <h2>
         <bean:message key="hello.jsp.page.hello"/>
         <bean:write name="personbean" property="userName" />!<p>
       </h2>
    </logic:present>
hello.jsp中的这段代码写了和没写总是一样，运行正常，也没有错误
范围扩大，你把 request.setAttribute("personbean",pb);
改成request.getSession.setAttribute("personbean",pb);
<logic:present name="personbean" scope="request">
=><logic:present name="personbean" scope="session">
就是在action中的request.setAttribute("personbean", object);
我的action不是有这个吗？
request.setAttribute("personbean",pb);
<logic:present name="personbean" scope="request"><%//判断该对象是否在requets中存在 %>
       <h2>

       Hello <bean:write name="personbean" property="userName" />!<p><%       //她会搜索最先搜索request，然后就session知道找到该对象就返回，没有就没有
  %>
       </h2>
</logic:present>
这个东西对应的是一个对象，一个存放再request，或者session中的对象
刚开始接触这个么？
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %><html:html locale="true">
  <head>
    <title><bean:message key="hello.jsp.title"/></title>
    <html:base/>
  </head>  <body bgcolor="white"><p>
    <h2><bean:message key="hello.jsp.page.heading"/></h2><p>
   <html:errors/><p>     <logic:present name="personbean" scope="request">
       <h2>
         <bean:message key="hello.jsp.page.hello"/>
         <bean:write name="personbean" property="userName" />!<p>
       </h2>
    </logic:present>    <html:form action="/HelloWorld.do" focus="userName" >
      <bean:message key="hello.jsp.prompt.person"/>
      <html:text property="userName" size="16" maxlength="16"/><br>
      <html:submit property="submit" value="Submit"/>
      <html:reset/>    </html:form><br>    <html:img page="/images/struts-power.gif" alt="Powered by Struts"/>
  </body>
</html:html>
package hello;import javax.servlet.http.HttpServletRequest;import java.sql.SQLException;
import java.util.ArrayList;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import hello.personbeanForm;public final class personbeanAction extends Action  {     public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception
{
  personbeanForm pb =  (personbeanForm) form;

  String userName = pb.getUserName();
  if ((userName==null) || (userName.compareTo("")==0))
  userName = "ok";

  personbean person = new personbean();
  person.setUserName(userName);

  request.setAttribute("personbean",person);

  System.out.print(person.getUserName());//正常

  return (mapping.findForward("Testok"));
}

}请教了，有什么错误吗？执行没有任何错误提示。
试试看,
上面放上<jsp:userBean id="personbean" ....>
然后logic:present改成
<logic:notEmpty name="personbean" property="userName" scope="request">
<logic:present name="personbean" scope="request" type="java.lang.String">
应该可以