Spring Boot 之JSP

激活传统的Servlet Web部署

导入相关jar

<!-- JSP模板引起 -->
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>
        
        <!-- jstl标签库 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>

启动类继承SpringBootServletInitializer，并组装

package com.adagio.chat;

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 ChatApplication extends SpringBootServletInitializer {

    public static void main(String[] args) {
        SpringApplication.run(ChatApplication.class, args);
    }
    
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        builder.sources(ChatApplication.class);
        return builder;
    } 
    
}

参照类WebMvcProperties 配置JSP视图

spring.mvc.view.prefix=/WEB-INF/views/
spring.mvc.view.suffix=.jsp

更改pom文件为warbao

<packaging>war</packaging>

编写测试demo

新建目录：/src/main/webapp/WEB-INF/views
在上面目录下新建index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>

    hello,${message }
</body>
</html>

新建Controller类

package com.adagio.chat.jsp;

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

@Controller
public class JspDemoController {

    @RequestMapping("index")
    public String index(Model model){
        model.addAttribute("message", "World");
        return "index";
    }
}

启动访问：http://localhost:8080/index
发现index路径有映射但是访问不到，pom添加

<dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <scope>provided</scope>
        </dependency>