我想從控制器返回一個簡單的字符串「HelloSpring」到jsp。控制器是ModelAndView對象不返回到jsp
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>
當我執行這個在Tomcat 7我得到頁的肉體 「空」 的字符串。我的web.xml是
<?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>
爲了使用'(String)request.getAttribute(「message」)'你必須先'request.setAttribute(「message」)''。 – Jonathan
那麼我認爲你只需要返回你想要控制器去的視圖。在這種情況下,不是'返回新的ModelAndView(「hello」,「message」,message);''只使用'return「hello」'; – Jonathan
謝謝,我認爲在Spring中屬性必須通過ModelAndView構造函數傳遞。 – gc5