让SpringBoot应用同时可以嵌入式和部署到Tomcat容器来运行详解
使用 Spring Boot 应用,我们可以jar方式启动,可以创建一个war
文件部署到web服务器中。
扩展SpringBootServletInitializer类
在原本注解为@SpringBootApplication
的Spring Boot App上扩展一个SpringBootServletInitializer
类。Spring Boot Servlet Initializer 类允许你的SpringBoot应用在使用 Web容器启动时配置应用。示例如下:
package org.wjw.sboot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
@SpringBootApplication
public class DemoApplication extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(FavoritesApplication.class);
}
public static void main(String[] args) {
SpringApplication.run(FavoritesApplication.class, args);
}
}
设置主类
在 Spring Boot 中,我们需要在构件文件中指定主类。可使用下面的代码片段:
对于Maven,在 pom.xml
中增加启动类属性,如下所示:
<start-class>org.wjw.sboot.DemoApplication</start-class>
对于Gradle,在 build.gradle
中加入主类名,如下所示:
springBoot {
mainClass = "org.wjw.sboot.DemoApplication"
}
加入打包到war中
对于Maven,pom.xml
中打包 WAR 的插件如下:
<packaging>war</packaging>
对于Gradle,在build.gradle
中加上 应用 war 插件,如下所示:
apply plugin: 'war'
编写Rest 端点
现在,让我们编写一个简单的 Rest 端点,返回 “Hello World from Spring Boot” 字符串。要编写 Rest Endpoint,我们要在构建文件中加上 Spring Boot web starter 依赖。
对于Maven,在pom.xml
中加上 Spring Boot starter 依赖,如下所示:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
对于 Gradle,在 build.gradle 中加上 Spring Boot starter 依赖,如下所示:
代码语言:javascript复制dependencies {
compile("org.springframework.boot:spring-boot-starter-web")
}
现在,在 Spring Boot 应用类文件中编写 Rest 端点,示例代码如下:
代码语言:javascript复制package org.wjw.sboot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@SpringBootApplication
public class DemoApplication extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(DemoApplication.class);
}
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
@RequestMapping(value = "/")
public String hello() {
return "Hello World from Spring Boot";
}
}
打包应用
使用Maven 或 Gradle 命令将应用打包成独立的自包含Jar文件和可以部署到Tomcat服务器的war文件:
对于Maven,用 mvn package
来打包应用。之后,会创建一个war文件,可以在 target
目录下找到它
对于Gradle,用gradle clean build
来打包应用。之后,会创建一个war文件,可以在build/libs
目录下找到它
全部构建配置文件
pom.xml
代码语言:javascript复制<?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.wjw.sboot</groupId>
<artifactId>demo</artifactId>
<version>>1.0.0</version>
<packaging>war</packaging>
<packaging>jar</packaging>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath/>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<start-class>org.wjw.sboot.DemoApplication</start-class>
</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>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
build.gradle
代码语言:javascript复制buildscript {
ext {
springBootVersion = '1.5.8.RELEASE'
}
repositories {
maven { url "http://repo2.maven.org/maven2" }
mavenLocal()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
}
}
apply plugin: 'java'
apply plugin: 'org.springframework.boot'
apply plugin: 'war'
//apply plugin: 'idea'
//apply plugin: 'eclipse'
war {
baseName = 'demo'
version = '1.0.0'
}
sourceCompatibility = 1.8
targetCompatibility = 1.8
repositories {
mavenCentral()
maven { url "http://repo2.maven.org/maven2" }
}
dependencies {
compile "org.springframework.boot:spring-boot-starter-web:${springBootVersion}"
compile 'org.springframework.boot:spring-boot-starter-tomcat'
}
bootRun {
addResources = true
}
springBoot {
mainClass = "org.wjw.sboot.DemoApplication"
}
参考:
- https://segmentfault.com/a/1190000023502713
- https://www.jb51.net/article/136912.htm