1.简介      

Spring-Loaded是基于javaAgent实现的一个代理，更多javaAgent可以参考：

官网:

2.说明

目前最新版1.2.4.RELEASE实现了监听jar包的更新的机制，实现热更新jar包，目前官方提供的版本在linux上可以很好的运行，但在windows还存在bug，官网已经有人提出：。如果想在windows上测试可以自己手动改一下源码。

3.参数

-Dspringloaded=watchJars=main.jar:other.jar

4.实例

以win为例，这里需要手动改一下源码，编译一下

测试目录:

lib:springloaded-1.2.4.RELEASE.jar

main-0.0.1-SNAPSHOT.jar是测试的jar包，一般都是游戏逻辑jar包,测试

package org.main;import java.util.concurrent.TimeUnit;/** * Hello world! *  */public class App {	public static void main(String[] args) throws InterruptedException {		Reload reload = new Reload();		while (true) {			reload.load();						TimeUnit.SECONDS.sleep(2);		}	}}

package org.main;public class Reload {	public void load() {		System.out.println("load.....");	}}

java -javaagent:lib/springloaded-1.2.4.RELEASE.jar -noverify -Dspringloaded=verbose;explain;watchJars=main-0.0.1-SNAPSHOT.jar -jar main-0.0.1-SNAPSHOT.jarpause

D:\springloaded\win>java -javaagent:lib/springloaded-1.2.4.RELEASE.jar -noverify -Dspringloaded=verbose;explain;watchJars=main-0.0.1-SNAPSHOT.jar -jar main-0.0.1-SNAPSHOT.jarSL: [verbose mode on] Full configuration is:verbose;explain;watchJars=main-0.0.1-SNAPSHOT.jarSL: [explain mode on] Reporting on the decision making process within SpringLoaded2015-9-16 16:55:32 org.springsource.loaded.agent.SpringLoadedPreProcessor logPreProcess信息: SpringLoaded preprocessing: classname=org/main/App classloader=Launcher$AppClassLoader typeRegistry=TypeRegistry(id=1325628529,loader=sun.misc.Launcher$AppClassLoader)====remainingPrefix=====jar:file:/D:/springloaded/win/main-0.0.1-SNAPSHOT.jar====jarname=====main-0.0.1-SNAPSHOT.jar2015-9-16 16:55:32 org.springsource.loaded.agent.SpringLoadedPreProcessor preProcess信息: [explanation] Based on the name, type org/main/App is considered to be reloadable2015-9-16 16:55:32 org.springsource.loaded.ReloadableType 
    
     信息: New reloadable type: org.main.App (allocatedId=0) TypeRegistry(id=1325628529,loader=sun.misc.Launcher$AppClassLoader)2015-9-16 16:55:32 org.springsource.loaded.agent.Watcher addFile信息: Now watching d:\springloaded\win\main-0.0.1-SNAPSHOT.jar2015-9-16 16:55:32 org.springsource.loaded.TypeRegistry getReloadableType信息: >TypeRegistry.getReloadableType(typeRegistryId=0,typeId=0)2015-9-16 16:55:32 org.springsource.loaded.TypeRegistry getReloadableType信息: 
     
      信息: New reloadable type: org.main.Reload (allocatedId=1) TypeRegistry(id=1325628529,loader=sun.misc.Launcher$AppClassLoader)2015-9-16 16:55:32 org.springsource.loaded.TypeRegistry getReloadableType信息: >TypeRegistry.getReloadableType(typeRegistryId=0,typeId=1)2015-9-16 16:55:32 org.springsource.loaded.TypeRegistry getReloadableType信息: 
     
    

修改jar中的类文件，将Reload中的load....改成reload....  重新打包，并覆盖当前的jar，观察日志:

2015-9-16 16:57:32 org.springsource.loaded.agent.Watcher run信息: Observed last modification time change for d:\springloaded\win\main-0.0.1-SNAPSHOT.jar (lastScanTime=1442393851501)2015-9-16 16:57:32 org.springsource.loaded.agent.Watcher ......省略reload.....reload.....

热更新完成！

参考: