介绍如何将spring boot jar转成war
spring boot 默认是以jar包形式启动web程序，在新建spring boot项目时候可以选择war包的启动方式。 建议在开发的时候建立以jar包启动的web项目，启动效率更快，此时如果想发布成war包形式部署，需要做以下几步：
1 在pom.xml中将packaging的值修改为war
<packaging>jar</packaging>改成
<packaging>war</packaging>2 排除嵌入的tomcat包
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>改成
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>在这里需要移除对嵌入式Tomcat的依赖，这样打出的WAR包中，在lib目录下才不会包含Tomcat相关的JAR包，否则将会出现启动错误。另外，在移除对Tomcat的依赖后，为了保证编译正确，还需要添加对servlet-api的依赖
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-servlet-api</artifactId>
<version>7.0.42</version>
<scope>provided</scope>
</dependency>在这里将scope属性设置为provided，这样在最终形成的WAR中不会包含这个JAR包，因为Tomcat或Jetty等服务器在运行时将会提供相关的API类。此时，执行mvn package命令就会得到一个WAR文件，我们可以直接将其放到Tomcat下运行。
4 新增ServletInitializer类
src/main/java/com/example/config/ServletInitializer.java
package com.example.config;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.web.SpringBootServletInitializer;
import org.springframework.context.annotation.Configuration;
/**
* User: TOM
* Date: 2016/5/20
* email: beauty9235@gmail.com
* Time: 8:51*/
@Configuration
public class ServletInitializer extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(SpringJarWarApplication.class);
}
}下面是我们测试这个war
创建一个测试页
src/main/resources/templates/index.ftl
<!doctype html>
<html>
<head>
<meta charset="UTF-8"/>
<title>Study spring boot from jar to war</title>
</head>
<body>
<p>Hell tomLuo!</p>
<p>This is a web application, we will introduce how to convert spring boot jar for spring boot war</p>
</body>
</html>创建快捷的页面转向定义
将首页定位到src/main/resources/templates/index.ftl
/src/main/java/com/example/config/WebMvcConfig.java
package com.example.config;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Controller;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
/**
* User: TOM
* Date: 2016/5/20
* email: beauty9235@gmail.com
* Time: 9:19
*/
@Configuration
@ComponentScan(basePackages = { "com.example.web" }, useDefaultFilters = false, includeFilters = @Filter({ Controller.class }))
@EnableWebMvc
public class WebMvcConfig extends WebMvcConfigurerAdapter
{
Logger logger= LoggerFactory.getLogger(WebMvcConfig.class);
@Override
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/").setViewName("/index");
//添加更多
}
}Tomcat7配置
pom.xml加上插件
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
<configuration>
<path>/</path>
</configuration>
</plugin>tomcat配置
tomcat热布署
-javaagent:[your_path]\jrebel.jar -Xmx512M -Xms512M -XX:MaxPermSize=1024m -noverify系统启动后我们会看到 # 打印出结果
Hell tomLuo! This is a web application, we will introduce how to convert spring boot jar for spring boot war
