如何将对象从arraylist中获取到jsp中，并将其添加到控制器内的modelAndView中(how to get object into jsp from arraylist which is

如何将对象从arraylist中获取到jsp中，并将其添加到控制器内的modelAndView中(how to get object into jsp from arraylist which is added into modelAndView inside controller)

目前我正在开发Spring MVC。 我将把数据从控制器传输到视图。 我有一个包含对象的arraylist。它已被添加到控制器内的ModelAndView中，以便我可以将它用于JSP页面。

model.addObject("results",results);

我想使用值将其打印成表格形式，但我无法这样做。 我这样做

${results.get(0).getParameterName() }

但它显示错误

The function get must be used with a prefix when a default namespace is not specified

一切都很好。 有人可以帮我解决这个问题。

Servlet.service() for servlet spring-dispatcher threw exception org.apache.jasper.JasperException: /WEB-INF/ConfigureApplication.jsp(45,86) The function get must be used with a prefix when a default namespace is not specified at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39) at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:405) at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:146) at org.apache.jasper.compiler.Validator$1FVVisitor.visit(Validator.java:1243) at org.apache.jasper.compiler.ELNode$Function.accept(ELNode.java:122) at org.apache.jasper.compiler.ELNode$Nodes.visit(ELNode.java:193) at org.apache.jasper.compiler.ELNode$Visitor.visit(ELNode.java:234) at org.apache.jasper.compiler.ELNode$Root.accept(ELNode.java:53) at org.apache.jasper.compiler.ELNode$Nodes.visit(ELNode.java:193) at org.apache.jasper.compiler.Validator$ValidateVisitor.validateFunctions(Validator.java:1266) at org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:607) at org.apache.jasper.compiler.Node$ELExpression.accept(Node.java:896) at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163) at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2213) at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2219) at org.apache.jasper.compiler.Node$Root.accept(Node.java:456) at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163) at org.apache.jasper.compiler.Validator.validate(Validator.java:1489) at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:166) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:295) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:276) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:264) at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:303) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302) at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:209) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:267) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1221) at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1005) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:952) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852) at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837) at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454) at java.lang.Thread.run(Thread.java:722)

Currently Iam working on Spring MVC. I am going to transfer the data from controller to view. I have a arraylist which contain objects.It has been added to ModelAndView inside controller so that i can use it into JSP page.

model.addObject("results",results);

I want to use values to print it into table form but i am not able to do so. I am doing like this

${results.get(0).getParameterName() }

but it shows error

The function get must be used with a prefix when a default namespace is not specified

everything is working fine. Can someone help me to solve this problem.

Servlet.service() for servlet spring-dispatcher threw exception org.apache.jasper.JasperException: /WEB-INF/ConfigureApplication.jsp(45,86) The function get must be used with a prefix when a default namespace is not specified at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39) at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:405) at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:146) at org.apache.jasper.compiler.Validator$1FVVisitor.visit(Validator.java:1243) at org.apache.jasper.compiler.ELNode$Function.accept(ELNode.java:122) at org.apache.jasper.compiler.ELNode$Nodes.visit(ELNode.java:193) at org.apache.jasper.compiler.ELNode$Visitor.visit(ELNode.java:234) at org.apache.jasper.compiler.ELNode$Root.accept(ELNode.java:53) at org.apache.jasper.compiler.ELNode$Nodes.visit(ELNode.java:193) at org.apache.jasper.compiler.Validator$ValidateVisitor.validateFunctions(Validator.java:1266) at org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:607) at org.apache.jasper.compiler.Node$ELExpression.accept(Node.java:896) at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163) at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2213) at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2219) at org.apache.jasper.compiler.Node$Root.accept(Node.java:456) at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163) at org.apache.jasper.compiler.Validator.validate(Validator.java:1489) at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:166) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:295) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:276) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:264) at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:303) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302) at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:209) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:267) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1221) at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1005) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:952) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852) at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837) at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454) at java.lang.Thread.run(Thread.java:722)

最满意答案

${...}的术语是jsp表达式语言，而不是java。 List成员可以像数组成员和bean属性一样按名称访问。 因此你应该尝试：

${results[0].parameterName}

The term in ${...} is in jsp Expression Language and not java. Members of a List can be accessed like members of an array and bean properties by their name. Hence you should try:

${results[0].parameterName}