ModelAndView对象未返回到jsp [英] ModelAndView object not returned to jsp
问题描述
我正在尝试从控制器向jsp返回一个简单的字符串"HelloSpring".控制器是
I am trying to return a simple String "HelloSpring" from controller to jsp. Controller is
package it.polito.ai.e4;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.portlet.ModelAndView;
@Controller
public class HelloSpringController
{
@RequestMapping("/hello")
public ModelAndView helloSpring(HttpServletRequest request,
HttpServletResponse response)
{
String message = "HelloSpring";
return new ModelAndView("hello", "message", message);
}
}
jsp是
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Hello page</title>
</head>
<body>
<%=(String)request.getAttribute("message")%>
</body>
</html>
当我在Tomcat 7上执行此操作时，页面正文上出现"null"字符串.我的web.xml是
When I execute this on Tomcat 7 I get "null" string on page's body. My web.xml is
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<display-name>ai4</display-name>
<servlet>
<servlet-name>ai4</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>ai4</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
推荐答案
尝试导入org.springframework.web.servlet.ModelAndView而不是org.springframework.web.portlet.ModelAndView. :)
Try importing org.springframework.web.servlet.ModelAndView instead of org.springframework.web.portlet.ModelAndView. :)
而且，正如Sumit Desai提到的那样，自春季3以来，大多数人都这样编写控制器方法:
Also, as Sumit Desai mentioned, since Spring 3, most people write their controller methods like this:
@RequestMapping("/hello")
public String helloSpring(Model m)
{
m.addAttribute("message", "HelloSpring");
return "hello";
}
这只是样式，您所做的也行得通.希望有帮助.
It's just style, and what you've done works too. Hope that helps.
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