Question

输出显示$ {message}而不是“Spring”。
是否需要依赖来显示我的信息的价值？
我已经使用过Spring MVC，但我使用的是xml配置。我在这里错过了什么吗？希望你能帮我解决这个问题。

<dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <!-- Spring dependencies -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.1.3</version>
        </dependency>

    </dependencies>

控制器

package com.jwlayug.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class ControllerA {
     @RequestMapping(value = "/hello")
       public String printHello(Model model) {
          model.addAttribute("message", "Spring");
          System.out.println("this method is called!");
          return "hellow";
       }


}

配置

package com.jwlayug.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.view.JstlView;
import org.springframework.web.servlet.view.UrlBasedViewResolver;

@Configuration
// Marks this class as configuration
// Specifies which package to scan
@ComponentScan("com.jwlayug")
// Enables Spring's annotations
@EnableWebMvc
public class Config {

    @Bean
    public UrlBasedViewResolver setupViewResolver() {
        UrlBasedViewResolver resolver = new UrlBasedViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        resolver.setViewClass(JstlView.class);
        return resolver;
    }
}


package com.jwlayug.config;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;

import javax.servlet.ServletRegistration.Dynamic;

import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

public class WebInitializer implements WebApplicationInitializer{
    public void onStartup(ServletContext servletContext)
            throws ServletException {

        AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
        ctx.register(Config.class);

        ctx.setServletContext(servletContext);

        Dynamic servlet = servletContext.addServlet("dispatcher",
                new DispatcherServlet(ctx));
        servlet.addMapping("/");
        servlet.setLoadOnStartup(1);

    }
}

JSP

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
    <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
${message}
<c:out value="${message}" />
</body>
</html>

Answer 1

我通过在你的jsp上添加这两行代码找到了解决方案..

<%@page contentType="text/html;charset=UTF-8" language="java" %>
<%@page isELIgnored="false" %>

Answer 2

${message}不是EL表达式之外的JSP的有效语法，就像<c:out/>中的那样。

请查看http://www.tutorialspoint.com/jsp/jsp_standard_tag_library.htm

Answer 3

您需要将模型返回到视图。

@Controller
public class ControllerA {
     @RequestMapping(value = "/hello")
     public ModelAndView printHello() {
         ModelAndView mav = new ModelAndView("viewname");
         mav.addObject("message", "Spring");
         return mav;
     }
}

然后在你的jsp：

${message}

Spring MVC模型属性不显示

3 个答案: