Spring-boot hot deployment
Way 1 Spring loader plug-in:
1. Adding Dependency on pom.xml to New maven Project

<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>
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.10.RELEASE</version>
  </parent>
  <groupId>cn.zds</groupId>
  <artifactId>20-spring-boot-springloader</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
  <properties>
  <java.version>1.7</java.version>
  <thymeleaf.version>3.0.2.RELEASE</thymeleaf.version>
  <thymeleaf-layout-dialect.version>2.0.4</thymeleaf-layout-dialect.version>
  </properties>
  
  <dependencies>
  	<!-- springBoot Starter -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- thymeleaf Starter -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
  </dependencies>
  
  <!-- springloader Plug-in unit -->
	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<dependencies>
					<dependency>
						<groupId>org.springframework</groupId>
						<artifactId>springloaded</artifactId>
						<version>1.2.5.RELEASE</version>
					</dependency>
				</dependencies>
			</plugin>
		</plugins>
	</build>
</project>

2. Write controller normally

package cn.zds.controller;

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

@Controller
public class DemoController {
	@RequestMapping("/test")
	public String getHello(){
		
		System.out.println("hello...");
		return "hello";
	}
}

3. Write startup class App.java normally

package cn.zds;

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


@SpringBootApplication
public class App {

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

4. Create a new lib under the project and paste Springload's jar package
5. Right-click run congigurations in startup class App.java
Enter the command - javaagent:. lib spring loaded - 1.2.5. RELEASE. Jar - noverify

Note 1: This method can update the java code in real time, but it can not update the front-end page information.
Mode 2 devtools tool (personal recommendation):
1. New maven project configuration pom.xml dependencies

<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>
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.10.RELEASE</version>
  </parent>
  <groupId>cn.zds</groupId>
  <artifactId>20-spring-boot-springloader</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
  <properties>
  <java.version>1.7</java.version>
  <thymeleaf.version>3.0.2.RELEASE</thymeleaf.version>
  <thymeleaf-layout-dialect.version>2.0.4</thymeleaf-layout-dialect.version>
  </properties>
  
  <dependencies>
  	<!-- springBoot Starter -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- thymeleaf Starter -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    <!-- devtools Thermal deployment -->
     <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
         <!-- optional Function: Not passed to subclasses -->
        <optional>true</optional>
    </dependency>
  </dependencies>
  
  
</project>

2. Write controller normally

package cn.zds.controller;

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

@Controller
public class DemoController {
	@RequestMapping("/test")
	public String getHello(){
		
		System.out.println("hello...aaa aaass");
		return "hello";
	}
}

3. Write startup classes normally

package cn.zds;

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


@SpringBootApplication
public class App {

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

4. Just run the startup class normally.
5. Project structure:

Features: The front and back end can be changed in time. This tool is implemented by restarting the boot class. It is recommended by individuals.