Spring Boot MVC 不使用 JSP 中的模型值 [英] Spring Boot MVC not using model values in JSP
问题描述
我正在开发一个 Spring Boot MVC 应用程序.我的问题是，当视图出现时，它不会解析模型中的值.
I am working on an Spring Boot MVC application. My issue is that when the view appears, it does not parse the values from the Model.
application.properties
spring.application.name=test-mvc
server.context-path=/test-mvc
配置
@Configuration
@EnableWebMvc
public class ApplicationConfigurerAdapter extends WebMvcConfigurerAdapter{
@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
@Bean
public InternalResourceViewResolver viewResolver() {
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix("/WEB-INF/pages/");
resolver.setSuffix(".jsp");
return resolver;
}
}
申请
@SpringBootApplication
public class Application extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(Application.class);
}
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
控制器
@Controller
@RequestMapping("/view")
public class TestController {
@RequestMapping("/greeting")
public String greeting(@RequestParam(value="name", required=false, defaultValue="World") String name, ModelMap model) {
model.addAttribute("name", name);
return "greeting";
}
}
greeting.jsp
<html>
<head><title>Hello world Example</title></head>
<body>
<h1>Hello ${name}, How are you?</h1>
</body>
</html>
来自 http://localhost:8080/test-mvc/view/的输出greeting?name=Mikey:
你好 ${name}，你好吗?
Hello ${name}, How are you?
我也尝试过返回一个 ModelAndView.我不知道为什么它没有将Mikey"放在 ${name} 所在的位置.
I have also tried returning a ModelAndView. I am not sure why it's not putting "Mikey" in where ${name} is.
更新
每次我向 JSP 页面添加 taglib 或任何东西时，它都会显示页面源代码.它不呈现页面.下面是我的 pom.xml
Every time I add a taglib or anything to the JSP page, it displays the page source. It doesn't render the page. Below is my pom.xml
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.3.RELEASE</version>
</parent>
<properties>
<hibernate.version>5.0.5.Final</hibernate.version>
<postgres.version>9.4.1208</postgres.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j</artifactId>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
</dependency>
<dependency>
<groupId>org.apache.taglibs</groupId>
<artifactId>taglibs-standard-impl</artifactId>
<version>1.2.5</version>
</dependency>
</dependencies>
推荐答案
在您的 pom.xml 中添加以下依赖项:
Add below dependencies in your pom.xml:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
您可能需要添加以下依赖项以避免javax.servlet.ServletException: java.lang.NoSuchMethodError: org.apache.el.lang.ELSupport.coerceToType.如果您不将其添加为 scope=required，则 tomcat-embed-el-8.0.32.jar 将放置在您的 Tomcat 8.0\webapps\AppName\WEB-INF\lib 文件夹，会导致上述错误.如果您从 IDE 或 mvn Spring-boot:run 命令运行您的应用程序，则不需要添加以下依赖项.
You might have to add below dependency to avoid javax.servlet.ServletException: java.lang.NoSuchMethodError: org.apache.el.lang.ELSupport.coerceToType.
If you don't add this as scope=required then tomcat-embed-el-8.0.32.jar will be placed in your Tomcat 8.0\webapps\AppName\WEB-INF\lib folder and will cause above error.
You don't need to add below dependency if you run your app from IDE or mvn Spring-boot:run command.
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-el</artifactId>
<scope>provided</scope>
</dependency>
然后访问-http://localhost:8080/AppName/view/greeting?name=米奇
检查此存储库以获取完整源代码.
更新:问题 JSP 示例的 Tomcat war 部署由于tomcat-embed-el" 依赖在 Spring Boot 中得到修复 -1.4.0.M2
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