无法使用 Spring Boot 呈现 JSP答案

【问题标题】：Unable to render the JSP using Spring Boot无法使用 Spring Boot 呈现 JSP
【发布时间】：2018-01-13 23:48:59
【问题描述】：

我是 Spring Boot 的新手，我想从一个简单的例子开始，但似乎没有任何效果这是我的控制器：

Package controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class testController {
RequestMapping("view/aboutus")
public String greeting(Model model) {
 model.addAttribute("name", "azertyyyy");
  return "aboutus";  }}

这是jsp视图：

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
   <%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<!DOCTYPE>
<html> <body>  ${name}


 <p>hello world</p> </body></html>

我添加了所需的依赖项：

 <dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>


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

我在 application.properties 中添加了前缀和后缀

当我运行应用程序时，视图上只显示 hello world，没有 name 变量，在此处搜索后，我将视图目录从 src/main/webapp/view 更改为 src/main/resource/templates 但 spring boot 不能再也找不到风景了

【问题讨论】：

如果有不清楚的地方我可以补充一些细节

标签： java jsp spring-mvc tomcat spring-boot

【解决方案1】：

我不确定您是否完全了解当我们想将应用程序作为 war 包运行时我们必须进行的更改。

将包装从 jar 更改为 war 并需要依赖项。
更改主应用类以扩展 SpringBootServletInitializer 并实现 configure()
在应用程序属性中定义您的 jsp 页面路径
将 JSP 放入正确的路径（webapp/WEB-INF/jsp 检查屏幕截图）

项目的目录结构

以下是运行 JSP 必须进行的代码更改

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>com.test</groupId>
    <artifactId>Test_Exception_Framework</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>Test_Exception_Framework</name>
    <description>Project to test ExceptionFramework</description>


    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.4.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <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>

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


        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>

        <!-- Need this to compile JSP -->
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>org.eclipse.jdt.core.compiler</groupId>
            <artifactId>ecj</artifactId>
            <version>4.6.1</version>
            <scope>provided</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>

            <plugin>
                <groupId>org.jacoco</groupId>
                <artifactId>jacoco-maven-plugin</artifactId>
                <version>0.7.5.201505241946</version>
                <executions>
                    <execution>
                        <id>default-prepare-agent</id>
                        <goals>
                            <goal>prepare-agent</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>default-report</id>
                        <phase>prepare-package</phase>
                        <goals>
                            <goal>report</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

主类

package com.exception;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;

@SpringBootApplication
public class SpringBootWebApplication extends SpringBootServletInitializer {

    public static void main(String[] args) {

        SpringApplication.run(SpringBootWebApplication.class, args);
    }

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(SpringBootWebApplication.class);
    }


}

Rest Controller - 重定向到 JSP

package com.exception.controller;

import java.util.Map;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping(method = RequestMethod.GET)
public class TestExceptionController {

    @RequestMapping("/")
    public String welcome(Map<String, Object> model) {

        System.out.println("in controller");

        model.put("message", "hello spring boot");

        return "welcome";
    }

}

application.properties - 定义 JSP 的路径

server.port=8085
spring.mvc.view.prefix: /WEB-INF/jsp/
spring.mvc.view.suffix: .jsp

【讨论】：

【解决方案2】：

1)*** use spring version 2.0.3.RELEASE or less
2) add the dependency
     <!-- Need this to compile JSP -->
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>

3) this optional dependency

<!-- JSTL for JSP -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <scope>provided</scope>

        </dependency>

【讨论】：