默认是index.jsp？

1.web.xml 配置中默认是以路径WebRoot下的index.jsp 或者 index.html 或者 其他 index.后缀 的,看看web.xml默认首页设置对没,要不然就直接输入完整的
url地址访问页面.
2.tomcat的版本,jdk的版本,是否对应.
3.查看控制台console,可以debug模式打印日志,tomcat是否启动正常.
4.tomcat内webapps目录下有多余的,不正确的其他web项目,清除掉(注意备份),重启
5.spring和struts的配置是否有问题.(如果有错误,3.中的控制台输出应该会显示).

你好，应该是路径的问题，404都是路径找不到的原因，所以遇到这个问题得先看自己的路径对否

web.xml有问题

web.xml有问题

先查看控制台 可能是框架整合的配置文件出错

实现类和Action代码

 package org.dao.imp;
import java.util.*;
import org.dao.*;
import org.model.*;
import org.hibernate.*;

public class DlDaoImp extends BaseDAO implements DlDao{
    //实现：根据学号和口令查找
    public Dlb find(String xh,String kl){
        //查询DLB表中的记录
        String hql = "from Dlb u where u.xh=? and u.kl=?";
        Session session=getSession();
        Query query=session.createQuery(hql);
        query.setParameter(0, xh);
        query.setParameter(1, kl);
        List users=query.list();
        Iterator it=users.iterator();
        while(it.hasNext()){
            if(users.size()!=0){
                //创建持久化的javabean对象user
                Dlb user=(Dlb)it.next();
                return user;
            }
        }
        session.close();
        return null;
    }

}

 package org.action;
import java.util.*;
import org.model.*;
import org.service.*;
import com.opensymphony.xwork2.*;
public class DlAction extends ActionSupport{
    private Dlb dl;
    protected DlService dlService;
    //处理用户请求的execute方法
    public String execute() throws Exception{
        boolean validated=false; //验证成功标识
        Map session=ActionContext.getContext().getSession(); //获得会话对象，用来保存当前登录用户的信息
        Dlb dl1=null;
        //先获得Dlb对象，如果是第一次访问该页，用户对象肯定为空，但是如果是第二次甚至第三次，
        //就直接登录主页而无须再次重复验证该用户的信息
        dl1=(Dlb)session.get("dl");
        //如果用户是第一次进入，会话中尚未存储dl1持久化对象，故为null
        if(dl1==null){
            dl1=dlService.find(dl.getXh(), dl.getKl());
            if(dl1!=null){
                session.put("dl", dl1); //把dl1对象存储在会话中
                validated=true; //标识为true表示验证成功通过
            }
        }
        else{
            validated=true; //该用户在之前已登录并通过验证，标识为true表示无须再验证
        }
        if(validated){
            return SUCCESS;
        }
        else{
            return ERROR;
        }
    }
    public Dlb getDl() {
        return dl;
    }
    public void setDl(Dlb dl) {
        this.dl = dl;
    }
    public DlService getDlService() {
        return dlService;
    }
    public void setDlService(DlService dlService) {
        this.dlService = dlService;
    }

}

错误结果

 HTTP Status 500 - could not resolve property: xh of: org.model.Dlb [from org.model.Dlb u where u.xh=? and u.kl=?]

type Exception report

message could not resolve property: xh of: org.model.Dlb [from org.model.Dlb u where u.xh=? and u.kl=?]

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.hibernate.QueryException: could not resolve property: xh of: org.model.Dlb [from org.model.Dlb u where u.xh=? and u.kl=?]
    org.hibernate.persister.entity.AbstractPropertyMapping.propertyException(AbstractPropertyMapping.java:83)
    org.hibernate.persister.entity.AbstractPropertyMapping.toType(AbstractPropertyMapping.java:77)
    org.hibernate.persister.entity.AbstractEntityPersister.toType(AbstractEntityPersister.java:1818)
    org.hibernate.hql.internal.ast.tree.FromElementType.getPropertyType(FromElementType.java:313)
    org.hibernate.hql.internal.ast.tree.FromElement.getPropertyType(FromElement.java:494)
    org.hibernate.hql.internal.ast.tree.DotNode.getDataType(DotNode.java:598)
    org.hibernate.hql.internal.ast.tree.DotNode.prepareLhs(DotNode.java:266)
    org.hibernate.hql.internal.ast.tree.DotNode.resolve(DotNode.java:213)
    org.hibernate.hql.internal.ast.tree.FromReferenceNode.resolve(FromReferenceNode.java:118)
    org.hibernate.hql.internal.ast.tree.FromReferenceNode.resolve(FromReferenceNode.java:114)
    org.hibernate.hql.internal.ast.HqlSqlWalker.resolve(HqlSqlWalker.java:881)
    org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.expr(HqlSqlBaseWalker.java:1258)
    org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.exprOrSubquery(HqlSqlBaseWalker.java:4270)
    org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.comparisonExpr(HqlSqlBaseWalker.java:3748)
    org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:1935)
    org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:1860)
    org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.whereClause(HqlSqlBaseWalker.java:794)
    org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:595)
    org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:299)
    org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:247)
    org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:248)
    org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:183)
    org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136)
    org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:105)
    org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
    org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:168)
    org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:219)
    org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:197)
    org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1736)
    org.dao.imp.DlDaoImp.find(DlDaoImp.java:13)
    org.service.imp.DlServiceManage.find(DlServiceManage.java:9)
    org.action.DlAction.execute(DlAction.java:19)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:497)
    com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:450)
    com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:289)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:252)
    org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
    org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:239)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:239)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:252)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:161)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:563)
    org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)