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1.简介
Spring-Loaded是基于javaAgent实现的一个代理，更多javaAgent可以参考：
java代理-javassist：http://my.oschina.net/OutOfMemory/blog/309283
官网:https://github.com/spring-projects/spring-loaded
当前的最新版：1.2.4.RELEASE
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：https://github.com/spring-projects/spring-loaded/issues/145。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
即watchJars选项，监听的多个jar之前用:分离
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.....");
}
} run.bat:
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.jar pause运行run.bat
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.jar SL: [verbose mode on] Full configuration is:verbose;explain;watchJars=main-0.0.1 -SNAPSHOT.jar SL: [explain mode on] Reporting on the decision making process within SpringLoad ed 2015-9-16 16:55:32 org.springsource.loaded.agent.SpringLoadedPreProcessor logPre Process 信息: SpringLoaded preprocessing: classname=org/main/App classloader=Launcher$Ap pClassLoader typeRegistry=TypeRegistry(id=1325628529,loader=sun.misc.Launcher$Ap pClassLoader) ====remainingPrefix=====jar:file:/D:/springloaded/win/main-0.0.1-SNAPSHOT.jar=== =jarname=====main-0.0.1-SNAPSHOT.jar 2015-9-16 16:55:32 org.springsource.loaded.agent.SpringLoadedPreProcessor prePro cess 信息: [explanation] Based on the name, type org/main/App is considered to be rel oadable 2015-9-16 16:55:32 org.springsource.loaded.ReloadableType <init> 信息: New reloadable type: org.main.App (allocatedId=0) TypeRegistry(id=13256285 29,loader=sun.misc.Launcher$AppClassLoader) 2015-9-16 16:55:32 org.springsource.loaded.agent.Watcher addFile 信息: Now watching d:\springloaded\win\main-0.0.1-SNAPSHOT.jar 2015-9-16 16:55:32 org.springsource.loaded.TypeRegistry getReloadableType 信息: >TypeRegistry.getReloadableType(typeRegistryId=0,typeId=0) 2015-9-16 16:55:32 org.springsource.loaded.TypeRegistry getReloadableType 信息: <TypeRegistry.getReloadableType(typeRegistryId=0,typeId=0) returning org.m ain.App 2015-9-16 16:55:32 org.springsource.loaded.agent.SpringLoadedPreProcessor logPre Process 信息: SpringLoaded preprocessing: classname=org/springsource/loaded/SSMgr classl oader=Launcher$AppClassLoader typeRegistry=TypeRegistry(id=1325628529,loader=sun .misc.Launcher$AppClassLoader) 2015-9-16 16:55:32 org.springsource.loaded.TypeRegistry couldBeReloadable 信息: WhyNotReloadable? The type org/springsource/loaded/SSMgr is using a packag e name ‘org/springsource/loaded/‘ which is considered infrastructure and types w ithin it are not made reloadable 2015-9-16 16:55:32 org.springsource.loaded.agent.SpringLoadedPreProcessor logPre Process 信息: SpringLoaded preprocessing: classname=java/lang/InterruptedException class loader=null typeRegistry=null 2015-9-16 16:55:32 org.springsource.loaded.agent.SpringLoadedPreProcessor logPre Process 信息: SpringLoaded preprocessing: classname=org/main/Reload classloader=Launcher $AppClassLoader typeRegistry=TypeRegistry(id=1325628529,loader=sun.misc.Launcher $AppClassLoader) 2015-9-16 16:55:32 org.springsource.loaded.agent.SpringLoadedPreProcessor prePro cess 信息: [explanation] Based on the name, type org/main/Reload is considered to be reloadable 2015-9-16 16:55:32 org.springsource.loaded.ReloadableType <init> 信息: New reloadable type: org.main.Reload (allocatedId=1) TypeRegistry(id=13256 28529,loader=sun.misc.Launcher$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: <TypeRegistry.getReloadableType(typeRegistryId=0,typeId=1) returning org.m ain.Reload 2015-9-16 16:55:32 org.springsource.loaded.agent.SpringLoadedPreProcessor logPre Process 信息: SpringLoaded preprocessing: classname=org/springsource/loaded/ISMgr classl oader=Launcher$AppClassLoader typeRegistry=TypeRegistry(id=1325628529,loader=sun .misc.Launcher$AppClassLoader) 2015-9-16 16:55:32 org.springsource.loaded.TypeRegistry couldBeReloadable 信息: WhyNotReloadable? The type org/springsource/loaded/ISMgr is using a packag e name ‘org/springsource/loaded/‘ which is considered infrastructure and types w ithin it are not made reloadable load..... 2015-9-16 16:55:32 org.springsource.loaded.agent.SpringLoadedPreProcessor logPre Process 信息: SpringLoaded preprocessing: classname=java/util/concurrent/TimeUnit classl oader=null typeRegistry=null 2015-9-16 16:55:32 org.springsource.loaded.agent.SpringLoadedPreProcessor logPre Process 信息: SpringLoaded preprocessing: classname=java/util/concurrent/TimeUnit$1 clas sloader=null typeRegistry=null 2015-9-16 16:55:32 org.springsource.loaded.agent.SpringLoadedPreProcessor logPre Process 信息: SpringLoaded preprocessing: classname=java/util/concurrent/TimeUnit$2 clas sloader=null typeRegistry=null 2015-9-16 16:55:32 org.springsource.loaded.agent.SpringLoadedPreProcessor logPre Process 信息: SpringLoaded preprocessing: classname=java/util/concurrent/TimeUnit$3 clas sloader=null typeRegistry=null 2015-9-16 16:55:32 org.springsource.loaded.agent.SpringLoadedPreProcessor logPre Process 信息: SpringLoaded preprocessing: classname=java/util/concurrent/TimeUnit$4 clas sloader=null typeRegistry=null 2015-9-16 16:55:32 org.springsource.loaded.agent.SpringLoadedPreProcessor logPre Process 信息: SpringLoaded preprocessing: classname=java/util/concurrent/TimeUnit$5 clas sloader=null typeRegistry=null 2015-9-16 16:55:32 org.springsource.loaded.agent.SpringLoadedPreProcessor logPre Process 信息: SpringLoaded preprocessing: classname=java/util/concurrent/TimeUnit$6 clas sloader=null typeRegistry=null 2015-9-16 16:55:32 org.springsource.loaded.agent.SpringLoadedPreProcessor logPre Process 信息: SpringLoaded preprocessing: classname=java/util/concurrent/TimeUnit$7 clas sloader=null typeRegistry=null load..... load..... load.....
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:http://www.blogjava.net/landon/archive/2015/07/01/425994.html
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原文地址：http://my.oschina.net/OutOfMemory/blog/506945
