springboot的war使用外部服务器需要继承SpringBootServletInitializer作为启动类

eclipse把spring boot项目打包成war包并部署到tomcat服务器上的步骤

tomcat下设置默认的启动项目方式

SpringBootServletInitializer的作用

Spring中WebApplicationInitializer的理解

SpringBootServletInitializer如何实现web.xml作用解析

将springboot打成war包放外部tomcat运行：

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.neo</groupId>
    <artifactId>spring-boot-jsp</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>spring-boot-jsp</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.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>
            <!-- 排除内置容器，排除内置容器导出成war包可以让外部容器运行spring-boot项目-->
            <!-- <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions> -->
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

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

</project>

java类：

package com.neo.web;

import java.util.Date;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

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

@Controller
public class WelcomeController {

    @GetMapping("/")
    public String welcome(Map<String, Object> model) {
        model.put("time", new Date());
        model.put("message", "hello world");
        return "welcome";
    }

    @GetMapping("/user")
    public String user(Map<String, Object> model, HttpServletRequest request) {
        model.put("username", "neo");
        model.put("salary", 666);
        request.getSession().setAttribute("count",6);
        return "user";
    }

}

package com.neo;

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.SpringApplication;

/**
 * 建议使用
 * mvn clean spring-boot:run
 * 来启动项目
 */
@SpringBootApplication
public class JspApplication {

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

package com.neo;

import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;


public class ServletInitializer extends SpringBootServletInitializer {
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(JspApplication.class);
    }
}

welcome.jsp

<!DOCTYPE html>
<html lang="en">

<body>
    Time:  ${time}
    <br>
    Message: ${message}
</body>

</html>