求助：struts应用helloapp出错

Question

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楼主【so8610】截止到2008-07-30 20:00:11的历史汇总数据(不包括此帖)：
发帖的总数量:1                        发帖的总分数:0                        每贴平均分数:0                        
回帖的总数量:1                        得分贴总数量:0                        回帖的得分率:0%                       
结贴的总数量:1                        结贴的总分数:0                        
无满意结贴数:1                        无满意结贴分:0                        
未结的帖子数:0                        未结的总分数:0                        
结贴的百分比:100.00%               结分的百分比:---------------------
无满意结贴率:100.00%               无满意结分率:---------------------
敬礼!
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Answer 1

HelloAction.java
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package Hello;//import javax.servlet.http.RequestDispatcher;
//import javax.servlet.http.ServleException;
import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpSession;
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 org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import org.apache.struts.util.MessageResources;//import com.myapp.struts.PersonBean;
//import com.myapp.struts.form.HelloForm;
/** 
 * @struts.action path="/hello" name="helloForm"
 * input="/form/hello.jsp" scope="request" validate="true"
 */
public final class HelloAction extends Action {    /* forward name="success" path="" */
    private final static String SUCCESS = "SayHello";    /**
     * This is the action called from the Struts framework.
     * @param mapping The ActionMapping used to select this instance.
     * @param form The optional ActionForm bean for this request.
     * @param request The HTTP Request we are processing.
     * @param response The HTTP Response we are processing.
     * @throws java.lang.Exception
     * @return
     */
    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        MessageResources messages = getResources(request);
        ActionMessages errors = new ActionMessages();
        String userName = (String) ((HelloForm) form).getUserName();        String badUserName = "Monster";        if (userName.equalsIgnoreCase(badUserName)) {
            errors.add("username", new ActionMessage("hello.dont.talk.to.monster",
                    badUserName));
            saveErrors(request, errors);
            return (new ActionForward(mapping.getInput()));
        }
        PersonBean pb = new PersonBean();
        pb.setUserName(userName);
        pb.saveToPersistentStore();        request.setAttribute(Constants.PERSON_KEY, pb);        request.removeAttribute(mapping.getAttribute());        return mapping.findForward("SayHello");    }
}

Answer 2

HelloForm.java/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package Hello;import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;public final class HelloForm extends ActionForm {    private String userName = null;    public String getUserName() {        return (this.userName);
    }
    public void setUserName(String userName) {        this.userName = userName;
    }
    /**
     * Reset all properties to their default values.
     */
    public void reset(ActionMapping mapping, HttpServletRequest request) {        this.userName = null;
    }    public ActionErrors validate(ActionMapping mapping,
            HttpServletRequest request) {
        ActionErrors errors = new ActionErrors();
        if ((userName == null) || (userName.length() < 1)) {
            errors.add("username", new ActionMessage("hello.no.username.error"));
        }
        return errors;
    }
}

Answer 3

1....hello.jsp<html:text property="UserName" size="16" /> <br>  UserName改为userName2....struts-confighello.HelloForm
hello.HelloAction第一个Hello是大写的