Question

当我删除行＆＃34; ModelAttribute（＆＃34; OrderDetail＆＃34;）List OrderDetail＆＃34;不再显示任何错误。但是如果我把这行＆＃34; List OrderDetail = new ArrayList（）;＆＃34;当我再次加载它将丢失列表中的数据。有人可以帮帮我吗？

Cartcontroller.java

@RequestMapping(value = {"addcart.html"})
    public String addCart(@RequestParam(value = "albumId") int albumId,
            @ModelAttribute("orderDetail") ModelMap model, @ModelAttribute("orderDetail") List<OrderDetail> orderDetail ) {
        if (orderDetail.size() == 0) {
            Album album = albumService.findAlbum(albumId);
            OrderDetail ordetail = new OrderDetail(album, 1);
            orderDetail.add(ordetail);
        } else {
            boolean isDup = false;
            for (int i = 0; i < orderDetail.size(); i++) {
                if (orderDetail.get(i).getAlbum().getAlbumId() == albumId) {
                    int quantity = orderDetail.get(i).getQuantity();
                    orderDetail.get(i).setQuantity(quantity + 1);
                    isDup = true;
                    break;
                }
            }
            if (isDup == false) {
                Album album = albumService.findAlbum(albumId);
                OrderDetail ordetail = new OrderDetail(album, 1);
                orderDetail.add(ordetail);
            }
        }
        List<Album> albumList = albumService.getAllAlbums();
        model.addAttribute("albumList", albumList);
        model.addAttribute("sumTypeOrder", orderDetail.size());
        return "home";
    }

针对home.jsp

<sec:authorize access="hasRole('User')">
                <div id="logtab">
                    <spring:message code="user.logged" />
                    :
                    <sec:authentication property="name" />
                </div>
            </sec:authorize>
            <div id="logtab">
                <c:if test="${sumTypeOrder}>0">
                    <a href="cart">Your Cart("${sumTypeOrder}")</a>
                </c:if>
            </div>
        </div>
        <div class="left"></div>
        <div class="content">
            <c:forEach items="${albumList}" var="album">
                <div class="album">
                    <td align="center">${album.name}</td>
                    <td align="center">${album.singer}</td>
                    <td align="center">${album.releaseDate}</td>
                    <td><a href="addcart.html?albumId=${album.albumId}">Add
                            to cart</a></td>
                </div>
            </c:forEach>
        </div>
        <div class="right"></div>
        <div class="footer"></div>
    </div>
</div>

loginController.java

@RequestMapping(value = { "/home", "/" }, method = RequestMethod.GET)
    public String welcomePage(Model model, Map<String, Object> map) {
        model.addAttribute("user", new User());
        model.addAttribute("album", new Album());
        Album album = new Album();
        map.put("album", album);
        map.put("albumList", albumService.getAllAlbums());
        return "home";
    }

异常：

SEVERE：servlet [spring]的Servlet.service（）与路径的上下文 [/ MusicStore]抛出异常[请求处理失败;嵌套异常是java.lang.IllegalArgumentException：参数类型不匹配]与根本原因java.lang.IllegalArgumentException：参数 sun.reflect.NativeMethodAccessorImpl.invoke0（Native。）中的类型不匹配方法）at sun.reflect.NativeMethodAccessorImpl.invoke（未知来源）at sun.reflect.DelegatingMethodAccessorImpl.invoke（未知来自）java.lang.reflect.Method.invoke（未知来源）at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod（HandlerMethodInvoker.java:176）在 org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod（AnnotationMethodHandlerAdapter.java:436）在 org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle（AnnotationMethodHandlerAdapter.java:424）在 org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:900）在 org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:827）在 org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:882）在 org.springframework.web.servlet.FrameworkServlet.doGet（FrameworkServlet.java:778）在javax.servlet.http.HttpServlet.service（HttpServlet.java:620）at javax.servlet.http.HttpServlet.service（HttpServlet.java:727）at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:303）在 org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:208）在 org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:241）在 org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:208）在 org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:330）在 org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke（FilterSecurityInterceptor.java:118）在 org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter（FilterSecurityInterceptor.java:84）在 org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）在 org.springframework.security.web.access.ExceptionTranslationFilter.doFilter（ExceptionTranslationFilter.java:113）在 org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）在 org.springframework.security.web.session.SessionManagementFilter.doFilter（SessionManagementFilter.java:103）在 org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）在 org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter（AnonymousAuthenticationFilter.java:113）在 org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）在 org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter（SecurityContextHolderAwareRequestFilter.java:54）在 org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）在 org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter（RequestCacheAwareFilter.java:45）在 org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）在 org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter（AbstractAuthenticationProcessingFilter.java:183）在 org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）在 org.springframework.security.web.authentication.logout.LogoutFilter.doFilter（LogoutFilter.java:105）在 org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）在 org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter（SecurityContextPersistenceFilter.java:87）在 org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）在 org.springframework.security.web.FilterChainProxy.doFilterInternal（FilterChainProxy.java:192）在 org.springframework.security.web.FilterChainProxy.doFilter（FilterChainProxy.java:160）在 org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate（DelegatingFilterProxy.java:346）在 org.springframework.web.filter.DelegatingFilterProxy.doFilter（DelegatingFilterProxy.java:259）在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:241）在 org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:208）在 org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:220）在 org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:122）在 org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:504）在 org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:170）在 org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:103）在 org.apache.catalina.valves.AccessLogValve.invoke（AccessLogValve.java:950）在 org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:116）在 org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:421）在 org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:1074）在 org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:611）在 org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run（JIoEndpoint.java:316） at java.util.concurrent.ThreadPoolExecutor.runWorker（Unknown Source） at java.util.concurrent.ThreadPoolExecutor $ Worker.run（Unknown Source）在 org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）在java.lang.Thread.run（未知来源）

java.lang.IllegalArgumentException：参数类型不匹配-SEVERE：servlet [spring]的Servlet.service（）与路径[/ MusicStore]的上下文

0 个答案: