JSP 渲染在 Spring 4 和 Tomcat 8.0.20 中不起作用

Question

我在尝试构建一个简单的 Spring Web 应用程序示例时遇到了麻烦。当我尝试显示 jsp 文件时，我得到了未呈现的 jsp 文件，就像一个 txt 文件。

提前谢谢你！

我正在使用最新版本的 Spring 4 和 tomcat 8.0.20。我的 Java SDK 和 JRE 是 8.0.40。这是我的文件夹结构：

src/main/java:
demo
---DemoApplication.java
demo.config
----MvcConfig.java
demo.controllers
----RootController.java


src
   main
      java
      resources
      webapp
         WEB-INF
             jsp
               test.jsp

application.properties 文件中没有任何内容。

现在，我将向您展示我的代码：

POM.XML

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.test</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.2.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <start-class>demo.DemoApplication</start-class>
        <tomcat.version>8.0.20</tomcat.version>
        <java.version>1.8</java.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-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- JSP -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>


        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </dependency>
    </dependencies>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

DemoApplication.java

package demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan
@EnableAutoConfiguration
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);

      }
}

MvcConfig.java

package demo.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

@EnableWebMvc
@Configuration
public class MvcConfig extends WebMvcConfigurerAdapter {

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

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

}

RootController.java

package demo.controllers;

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

@Controller
public class RootController {

    @RequestMapping("/")
    public String home (){
        return "test";

    }

}

test.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Inferno</title>
</head>
<body>
<h1>It's working!! Oh my god! I can't believe it!</h1>

</body>
</html>

Answer 1

我遇到了同样的问题，但就我而言，我有一个 servlet 映射： /* 这也将拦截对 jsp 的请求。

所以我在 web.xml 中删除了，一切正常

<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name> 
  <url-pattern>/</url-pattern>
  <!--   <url-pattern>/*</url-pattern> -->  <<<<
</servlet-mapping>

Answer 2

我认为你的 pom.xml 中需要这个：

<dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId> <scope>provided</scope> </dependency>

仅供参考，spring-boot 文档建议尽可能避免使用 JSP： http://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-developing-web-applications.html （在该页面上搜索 JSP）

干杯， 马库斯

Answer 3

我使用以下网址中提供的说明更改了执行此操作的方式。

http://crunchify.com/simplest-spring-mvc-hello-world-example-tutorial-spring-model-view-controller-tips/

http://docs.spring.io/spring-framework/docs/current/spring-framework-reference/html/mvc.html