在 Spring Boot 中使用 JSP

jsp？ 好多年没用了。重新整一下 还费了点时间，记录一下。

项目结构：

pom:

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.5.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.mg</groupId>
    <artifactId>his5</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>his5</name>
    <description>his5</description>
    <packaging>war</packaging>

    <url/>
    <licenses>
        <license/>
    </licenses>
    <developers>
        <developer/>
    </developers>
    <scm>
        <connection/>
        <developerConnection/>
        <tag/>
        <url/>
    </scm>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

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


        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>jakarta.servlet.jsp</groupId>
            <artifactId>jakarta.servlet.jsp-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>jakarta.servlet</groupId>
            <artifactId>jakarta.servlet-api</artifactId>
            <version>6.0.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

    </dependencies>

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

</project>

 配置文件中值得注意的地方如下，老版本springboot得用另外的包：

      <dependency>
            <groupId>jakarta.servlet.jsp</groupId>
            <artifactId>jakarta.servlet.jsp-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>

在 Spring Boot 支持的嵌入式容器中只有 Tomcat 支持使用 JSP，Undertow 和 Jetty 均不支持！

application.yml:  

spring:
    application:
        name : "his5"
    mvc:
        view:
            prefix: "/WEB-INF/views/"
            suffix: ".jsp"

 prefix: "/WEB-INF/views/"  是相对于webapp 的根目录起步的！

配置webapp 的根目录的地方如下：

controler:

package com.mg.his5.mvc;


import com.mg.his5.entity.User;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;

//restful @RestController class
@Controller
@RequestMapping("/his")
public class MvcController {




    @GetMapping("/hello")
    @ResponseBody
    public String hello() {
        return "Hello, MVC!";
    }



    @GetMapping("/")
    public ModelAndView index () {
        return new ModelAndView("index/index");
    }



    //return user information function
    @GetMapping("/user")
    @ResponseBody
    public User getUser(){
        User u= new User();
        u.setUsername("testUser");
        u.setPassword("testPassword");

        return u;

    }

}

不过 我觉得更好的办法是吧web 作为一个独立的模块，那样项目结构是不是更清晰呢

如下图启动项目：

test: