在JSP页面怎么遍历属性关联的属性,看看代码

qq_29808325 2015-07-30 10:28:02
User类代码,忽略getset


@Entity

@Table

public class User {



	private Integer id;

	private String number;

	private String passwd;

	private UserMessage useraMessage;

}


UserMessage类代码忽略getset


@Entity

@Table

public class UserMessage {



	private Integer id;

	private String name;

	private String clazz;

	

	@Past

	@DateTimeFormat(pattern="yyyy-MM-dd")

	private Date birthday;

}


SpringMVC Controller层代码


@Controller()

@RequestMapping("/admin")

public class SpringMVCAdmin {



	private AdminService adminService;



	@RequestMapping("/getAllUser")

	public String getAllUser(Map<String, Object> map) {

		map.put("users", adminService.getAllUser());

		List<User> l = adminService.getAllUser();

		System.out.println("MVCAdmin-->getAllUser-->userMessage.name = "+l.get(0).getUseraMessage().getName());

		return "Admin/list";

	}

}


list.jsp页面代码


<body>



	<table border="1">

		<tr>

			<td>ID</td>

			<td>学号</td>

			<td>名字</td>

			<td>班级</td>

			<td>成绩</td>

			<td>删除</td>

		</tr>

		<c:forEach items="${requestScope.users }" var="u">

			<tr>

				<td>${u.id }</td>

				<td><a href="admin/select/${u.id}">${u.number }</a></td>

				<td><a href="admin/select/${u.id}">${u.userMessage.name }</a></td>

				<td>${u.userMessage.clazz }</td>

				<td><a href="admin/results/${u.userMessage.id }">添加</a></td>

				<td><a href="admin/delete/${u.id }">删除</a></td>

			</tr>

		</c:forEach>

	</table>



</body>


user的属性都可以遍历出来,但是遍历不到user.userMessage属性,也拿不到user.userMessage.xxx的东西代码一出现就报错,注掉有关user.userMessage的代码就没问题.这是什么问题啊困扰我几天了,然后我在Controller层加的那句打印的能够正常打印出来
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qq137510669 2015-08-04
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和眼力无关，看错误信息： Property 'userMessage' not found on ... 的意思是'userMessage' 属性没有找到，而且前台页面写属性值时没有提示，这里是手工写的，确实容易写错
菜鸟营新兵 2015-08-03
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引用 3 楼 qq137510669 的回复:
页面的是u.userMessage.name 后台的是 private UserMessage useraMessage; u.userMessage.name改成u.useraMessage.name，中间少了个字母a
好眼力，这都被你发现了。
qq137510669 2015-08-03
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页面的是u.userMessage.name 后台的是 private UserMessage useraMessage; u.userMessage.name改成u.useraMessage.name，中间少了个字母a
qq_29808325 2015-07-30
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下面是报错代码 
严重: Servlet.service() for servlet jsp threw exception
javax.el.PropertyNotFoundException: Property 'userMessage' not found on type com.aode.jww.model.User
	at javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:266)
	at javax.el.BeanELResolver$BeanProperties.access$300(BeanELResolver.java:243)
	at javax.el.BeanELResolver.property(BeanELResolver.java:353)
	at javax.el.BeanELResolver.getValue(BeanELResolver.java:97)
	at org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:104)
	at org.apache.el.parser.AstValue.getValue(AstValue.java:183)
	at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
	at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:967)
	at org.apache.jsp.Admin.list_jsp._jspx_meth_c_005fforEach_005f0(list_jsp.java:166)
	at org.apache.jsp.Admin.list_jsp._jspService(list_jsp.java:109)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:748)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:486)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:411)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:338)
	at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:209)
	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:266)
	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1225)
	at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1012)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:822)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:744)
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