Question

我想将model属性传递给JSP文件并使用适当的JSTL标记进行打印。当我调用/home时，我看到的只是我曾经是属性的占位符（${name}）的标记;不是我设定的价值。

这是我的控制器：

@Controller
@RequestMapping(value = "/*")
public class MainController {

    @RequestMapping(value = "/home", method = RequestMethod.GET)
    public void home(Model model) {

        model.addAttribute("name", "John");
     }
}

实施WebConfig

的WebMvcConfigurer类

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = {"com.tk"})
public class WebConfig implements WebMvcConfigurer {

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    @Bean
    public InternalResourceViewResolver jspViewResolver() {
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
        viewResolver.setViewClass(JstlView.class);
        viewResolver.setPrefix("/WEB-INF/view/");
        viewResolver.setSuffix(".jsp");
        return viewResolver;
    }
}

WebAppInitializer上课

public class WebAppInitializer implements WebApplicationInitializer {
    @Override
    public void onStartup(ServletContext servletContext) {
        AnnotationConfigWebApplicationContext context = getContext();
        servletContext.addListener(new ContextLoaderListener(context));
        ServletRegistration.Dynamic dispatcherServlet = servletContext.addServlet("DispatcherServlet", new DispatcherServlet(context));
        dispatcherServlet.setLoadOnStartup(1);
        dispatcherServlet.addMapping("/");

        CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();
        characterEncodingFilter.setEncoding("UTF-8");
        characterEncodingFilter.setForceEncoding(true);
        servletContext.addFilter("characterEncodingFilter", characterEncodingFilter).addMappingForUrlPatterns(null, false, "/*");
    }

    private AnnotationConfigWebApplicationContext getContext() {
        AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
        context.setConfigLocation("com.tk.spring5App.config");
        return context;
    }
}

home.jsp文件内容：

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<html>
<body>
<h1><c:out value="${name}"/></h1>
</body>
</html>

最后这是我的pom.xml文件：

<properties>
    <java.version>1.8</java.version>
    <spring.framework.version>5.0.3.RELEASE</spring.framework.version>
</properties>

<dependencies>

    <!-- **********************************************************************
      **                SPRING DEPENDENCIES                                 **
      ********************************************************************** -->

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${spring.framework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-expression</artifactId>
        <version>${spring.framework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>${spring.framework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${spring.framework.version}</version>
        <exclusions>
            <exclusion>
                <groupId>commons-logging</groupId>
                <artifactId>commons-logging</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context-support</artifactId>
        <version>${spring.framework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>${spring.framework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${spring.framework.version}</version>
    </dependency>

    <!--javax.servlet-api-->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>4.0.0</version>
        <!--<scope>runtime</scope>-->
    </dependency>

    <!-- JSP Dependency -->
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>javax.servlet.jsp-api</artifactId>
        <version>2.3.1</version>
        <scope>provided</scope>
    </dependency>

    <!-- JSTL Dependency -->
    <dependency>
        <groupId>javax.servlet.jsp.jstl</groupId>
        <artifactId>javax.servlet.jsp.jstl-api</artifactId>
        <version>1.2.1</version>
    </dependency>
    <dependency>
        <groupId>taglibs</groupId>
        <artifactId>standard</artifactId>
        <version>1.1.2</version>
    </dependency>

    <!--javax.xml-->
    <dependency>
        <groupId>javax.xml.bind</groupId>
        <artifactId>jaxb-api</artifactId>
        <version>2.3.0</version>
    </dependency>    
</dependencies>

网络应用程序托管在Apache Tomcat 9.0.4。

Answer 1

你可能有一个（可能为空）web.xml版本为2.4或更低版本。在该版本中，默认情况下禁用评估EL表达式，因此表达式将显示为常规文本。

现在您有2个选项可以切换到更新的版本2.5

<web-app
        version="3.0"
        xmlns="http://java.sun.com/xml/ns/javaee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

或完全依赖注释删除web.xml。请注意，如果您需要这些配置选项（如web.xml，广泛的会话配置等），并非所有内容都可以通过注释（{1}}或web-fragment.xml进行配置，您仍然需要XML配置（但只是确保它有正确的版本）。

Spring MVC 5＆amp; Tomcat 9 - 无法在JSP中呈现模型属性

1 个答案: