如果应用程序是没有启动器的 Web 应用程序即服务，install4j 中的自动更新功能是否有效？我尝试了网络资源中提到的许多方法，但没有成功。请帮忙。我正在使用 install4j Windows 版本 6.1.6。
编辑1：
@英戈·凯格尔，
我添加了-Dinstall4j.keepLog=true -Dinstall4j.alternativeLogfile=E:/install4j-log/log.txt根据您的建议并得到以下日志。请帮忙。
[INFO] com.install4j.runtime.beans.actions.control.SetVariableAction [ID 630]: Execute action
Property script: com.install4j.script.I4jScript_Internal_38
Property variableName: updateDescriptorEntry
Property failIfNull: true
Property onlyIfUndefined: false
Property responseFileVariable: false
Property rollbackSupported: false
[ERROR] com.install4j.runtime.beans.actions.control.SetVariableAction [ID 630]: Execute action not successful after 4 ms
EDIT 2:以下是执行代码后的日志（exe文件下载后）UpdateChecker.executeScheduledUpdate(Arrays.asList("-q"), false, null);
Logs:
[INFO] com.install4j.runtime.beans.actions.update.CheckForUpdateAction [ID 629]: Execute action
Property connectTimeout: 10000
Property connectionFailureScript: null
Property readTimeout: 20000
Property requestHeaders: []
Property url: http://localhost:8181/astra-downloads/updates.xml
Property variable: updateDescriptor
Property acceptAllCertificates: false
Property askForProxy: true
Property rollbackSupported: false
Property showError: true
Download: http://localhost:8181/astra-downloads/updates.xml to C:\WINDOWS\TEMP\i4jupd4650856858406689282.xml; size: 366 bytes
Variable changed: updateDescriptor=com.install4j.runtime.installer.config.update.UpdateDescriptorImpl@82c94f[class com.install4j.runtime.installer.config.update.UpdateDescriptorImpl]
Execute action successful after 44 ms
[INFO] com.install4j.runtime.beans.actions.control.SetVariableAction [ID 630]: Execute action
Property script: com.install4j.script.I4jScript_Internal_63
Property variableName: updateDescriptorEntry
Property failIfNull: true
Property onlyIfUndefined: false
Property responseFileVariable: false
Property rollbackSupported: false
Branch 1
3.0.1
Variable changed: updateDescriptorEntry=UpdateDescriptorEntry [target: 22, file: GreytipAstra_windows_3_0_1.exe][class com.install4j.runtime.installer.config.update.UpdateDescriptorEntryImpl]
Execute action successful after 4 ms
[INFO] com.install4j.runtime.beans.actions.control.SetVariableAction [ID 632]: Execute action
Property script: com.install4j.script.I4jScript_Internal_65
Property variableName: updaterNewVersion
Property failIfNull: false
Property onlyIfUndefined: false
Property responseFileVariable: false
Property rollbackSupported: false
Variable changed: updaterNewVersion=3.0.1[class java.lang.String]
Execute action successful after 0 ms
[INFO] com.install4j.runtime.beans.actions.control.SetVariableAction [ID 633]: Execute action
Property script: com.install4j.script.I4jScript_Internal_66
Property variableName: updaterDownloadUrl
Property failIfNull: false
Property onlyIfUndefined: false
Property responseFileVariable: false
Property rollbackSupported: false
Variable changed: updaterDownloadUrl=http://localhost:8181/astra-downloads/GreytipAstra_windows_3_0_1.exe[class java.lang.String]
Execute action successful after 0 ms
[INFO] com.install4j.runtime.beans.actions.control.SetVariableAction [ID 634]: Execute action
Property script: com.install4j.script.I4jScript_Internal_67
Property variableName: updaterDownloadFile
Property failIfNull: false
Property onlyIfUndefined: false
Property responseFileVariable: false
Property rollbackSupported: false
Variable changed: updaterDownloadFile=C:/Users/Abhishek/Downloads\GreytipAstra_windows_3_0_1.exe[class java.lang.String]
Execute action successful after 0 ms
[INFO] com.install4j.runtime.beans.actions.net.DownloadFileAction [ID 635]: Execute action
Property connectTimeout: 10000
Property connectionFailureScript: null
Property md5Url:
Property readTimeout: 20000
Property requestHeaders: []
Property targetFile: C:\Users\Abhishek\Downloads\GreytipAstra_windows_3_0_1.exe
Property url: http://localhost:8181/astra-downloads/GreytipAstra_windows_3_0_1.exe
Property acceptAllCertificates: false
Property askForProxy: true
Property checkForMd5Sums: false
Property deleteOnExit: false
Property dontAskForRetry: false
Property retryIfInterrupted: true
Property rollbackSupported: false
Property showError: true
Property showFileName: true
Property showProgress: true
Download: http://localhost:8181/astra-downloads/GreytipAstra_windows_3_0_1.exe to C:\Users\Abhishek\Downloads\GreytipAstra_windows_3_0_1.exe; size: 43569152 bytes
Execute action successful after 2640 ms
[INFO] com.install4j.runtime.beans.actions.files.SetModeAction [ID 637]: Execute action
Property directoryFilter: null
Property fileFilter: null
Property fileTarget: everything
Property files: [C:\Users\Abhishek\Downloads\GreytipAstra_windows_3_0_1.exe]
Property filesRoot: null
Property mode: 755
Property recursive: false
Property rollbackSupported: true
Property showFileNames: true
Property showProgress: false
Execute action successful after 0 ms
[INFO] com.install4j.runtime.beans.actions.update.ScheduleUpdateAction [ID 638]: Execute action
Property arguments: []
Property installerFile: C:\Users\Abhishek\Downloads\GreytipAstra_windows_3_0_1.exe
Property maxCancelCount: 10
Property maxTries: 3
Property version: 3.0.1
Property rollbackSupported: false
Execute action successful after 3 ms
[INFO] com.install4j.runtime.beans.screens.StartupScreen [ID 627]: command: move 1 screens, executing actions, checking condition
[INFO] cleaning up
[INFO] Finished
EDIT 3:下面是日志UpdateChecker.executeScheduledUpdate(Arrays.asList("-q","-Dinstall4j.keepLog=true","-Dinstall4j.alternativeLogfile=E:/install4j-log/log2.txt"), false, null);
[INFO] logger started at Fri Sep 15 15:27:01 IST 2017
[INFO] executable name: C:\Users\Abhishek\Downloads\GreytipAstra_windows_3_0_1.exe
[INFO] install4j version: 6.1.6 (build 6459)
[INFO] Properties:
-- listing properties --
java.runtime.name=Java(TM) SE Runtime Environment
exe4j.moduleName=C:\Users\Abhishek\Downloads\GreytipAs...
sun.boot.library.path=c:\windows\temp\e4j101b.tmp_dir150546...
exe4j.semaphoreName=Local\c:_users_abhishek_downloads_gre...
java.vm.version=24.80-b11
java.vm.vendor=Oracle Corporation
java.vendor.url=http://java.oracle.com/
path.separator=;
exe4j.consoleCodepage=cp0
java.vm.name=Java HotSpot(TM) Client VM
file.encoding.pkg=sun.io
user.script=
user.country=US
sun.os.patch.level=
install4j.exeDir=C:\Users\Abhishek\Downloads\
java.vm.specification.name=Java Virtual Machine Specification
user.dir=C:\WINDOWS\TEMP\e4j101B.tmp_dir150546...
java.runtime.version=1.7.0_80-b15
java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment
java.endorsed.dirs=c:\windows\temp\e4j101b.tmp_dir150546...
os.arch=x86
java.io.tmpdir=C:\WINDOWS\TEMP\
line.separator=
java.vm.specification.vendor=Oracle Corporation
user.variant=
exe4j.tempDir=C:\WINDOWS\TEMP\e4j101B.tmp_dir150546...
os.name=Windows NT (unknown)
sun.java2d.noddraw=true
sun.jnu.encoding=Cp1252
java.library.path=C:\WINDOWS\TEMP\e4j101B.tmp_dir150546...
sun.awt.enableExtraMouseButtons=true
java.specification.name=Java Platform API Specification
java.class.version=51.0
sun.management.compiler=HotSpot Client Compiler
install4j.language=en
exe4j.isInstall4j=true
os.version=10.0
install4j.updateStorageDir=C:\WINDOWS\system32\config\systemprof...
user.home=C:\Windows\System32\config\systemprofile
user.timezone=Asia/Calcutta
java.awt.printerjob=sun.awt.windows.WPrinterJob
java.specification.version=1.7
file.encoding=Cp1252
user.name=ABHISHEK-PC$
java.class.path=C:\WINDOWS\TEMP\e4j101B.tmp_dir150546...
java.vm.specification.version=1.7
sun.arch.data.model=32
java.home=c:\windows\temp\e4j101b.tmp_dir150546...
sun.java.command=C:\Users\Abhishek\Downloads\GreytipAs...
exe4j.launchName=C:\Users\Abhishek\DOWNLO~1\GREYTI~1.EXE
java.specification.vendor=Oracle Corporation
user.language=en
awt.toolkit=sun.awt.windows.WToolkit
java.vm.info=mixed mode
exe4j.unextractedPosition=26515602
java.version=1.7.0_80
java.ext.dirs=c:\windows\temp\e4j101b.tmp_dir150546...
sun.boot.class.path=c:\windows\temp\e4j101b.tmp_dir150546...
java.vendor=Oracle Corporation
install4j.appDir=C:\Windows\Temp\
file.separator=\
java.vendor.url.bug=http://bugreport.sun.com/bugreport/
sun.cpu.endian=little
sun.io.unicode.encoding=UnicodeLittle
install4j.alternativeLogfile=E:/install4j-log/log2.txt
install4j.lockFile=C:\WINDOWS\system32\config\systemprof...
install4j.keepLog=true
sun.desktop=windows
sun.cpu.isalist=pentium_pro+mmx pentium_pro pentium+m...
[INFO] com.install4j.runtime.beans.actions.misc.RequestPrivilegesAction [ID 304]: Execute action
Property allRequested: false
Property failIfNotRootUnix: true
Property obtainIfAdminMac: false
Property obtainIfNormalWin: false
Property obtainIfNormalMac: false
Property obtainIfAdminWin: true
Property failIfNotObtainedWin: true
Property failIfNotObtainedMac: true
Property rollbackSupported: false
Execute action successful after 1 ms
[INFO] com.install4j.runtime.beans.screens.StartupScreen [ID 1]: command: move 1 screens, executing actions, checking condition
[INFO] com.install4j.runtime.beans.screens.WelcomeScreen [ID 2]: Show screen
[INFO] checking writable with maximum
[INFO] com.install4j.runtime.beans.screens.WelcomeScreen [ID 2]: thread name AWT-EventQueue-0
EDIT 4:我在应用程序中的代码：
try {
ApplicationLauncher.launchApplication("626", null, false, new ApplicationLauncher.Callback() {
public void exited(int exitValue) {
//TODO add your code here (not invoked on event dispatch thread)
log.debug("******Exited "+exitValue+"********");
log.debug("****Inside block UpdateChecker.isUpdateScheduled() "+String.valueOf(UpdateChecker.isUpdateScheduled()));
boolean updateScheduled=UpdateChecker.isUpdateScheduled();
if(updateScheduled){
log.debug("***************Running UpdateChecker.executeScheduledUpdate*******************");
UpdateChecker.executeScheduledUpdate(Arrays.asList("-q","-Dinstall4j.keepLog=true","-Dinstall4j.alternativeLogfile=E:/install4j-log/log2.txt"), false, null);
log.debug("***************Completed UpdateChecker.executeScheduledUpdate*******************");
}
}
public void prepareShutdown() {
//TODO add your code here (not invoked on event dispatch thread)
log.debug("******prepare shut down********");
}
}
);
} catch (IOException e) {
e.printStackTrace();
//TODO handle invocation failure
}
And the jstack error is as below:
EDIT 5:下面是jstack日志：
2017-09-18 17:31:12
Full thread dump Java HotSpot(TM) Client VM (24.80-b11 mixed mode):
"TimerQueue" daemon prio=6 tid=0x17ecec00 nid=0x3708 waiting on condition [0x1861f000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x03850980> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(Unknown Source)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
at java.util.concurrent.DelayQueue.take(Unknown Source)
at javax.swing.TimerQueue.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Locked ownable synchronizers:
- <0x03884b18> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
"AWT-EventQueue-0" prio=6 tid=0x17d3f000 nid=0x2670 waiting on condition [0x1841e000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x08ca4218> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(Unknown Source)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
at java.awt.EventQueue.getNextEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Locked ownable synchronizers:
- None
"AWT-Windows" daemon prio=6 tid=0x17d2fc00 nid=0x40c runnable [0x1838f000]
java.lang.Thread.State: RUNNABLE
at sun.awt.windows.WToolkit.eventLoop(Native Method)
at sun.awt.windows.WToolkit.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Locked ownable synchronizers:
- None
"AWT-Shutdown" prio=6 tid=0x17d2f400 nid=0xe68 in Object.wait() [0x182ff000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x08c79758> (a java.lang.Object)
at java.lang.Object.wait(Object.java:503)
at sun.awt.AWTAutoShutdown.run(Unknown Source)
- locked <0x08c79758> (a java.lang.Object)
at java.lang.Thread.run(Unknown Source)
Locked ownable synchronizers:
- None
"Java2D Disposer" daemon prio=10 tid=0x17d2ec00 nid=0x3d64 in Object.wait() [0x1826f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x08c797e8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
- locked <0x08c797e8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at sun.java2d.Disposer.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Locked ownable synchronizers:
- None
"Service Thread" daemon prio=6 tid=0x1783bc00 nid=0x468 runnable [0x00000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"C1 CompilerThread0" daemon prio=10 tid=0x1783a000 nid=0x1768 waiting on condition [0x00000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"Attach Listener" daemon prio=10 tid=0x17837800 nid=0x389c waiting on condition [0x00000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"Signal Dispatcher" daemon prio=10 tid=0x17835400 nid=0x3258 runnable [0x00000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"Finalizer" daemon prio=8 tid=0x0101a800 nid=0x4394 in Object.wait() [0x033bf000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x08ab74f8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
- locked <0x08ab74f8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at java.lang.ref.Finalizer$FinalizerThread.run(Unknown Source)
Locked ownable synchronizers:
- None
"Reference Handler" daemon prio=10 tid=0x01015800 nid=0x3d50 in Object.wait() [0x0127f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x08ab7588> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:503)
at java.lang.ref.Reference$ReferenceHandler.run(Unknown Source)
- locked <0x08ab7588> (a java.lang.ref.Reference$Lock)
Locked ownable synchronizers:
- None
"main" prio=6 tid=0x010ac400 nid=0x3138 in Object.wait() [0x00798000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x038517d0> (a com.install4j.runtime.installer.controller.CommandSink)
at java.lang.Object.wait(Object.java:503)
at com.install4j.runtime.installer.controller.Controller.start(Controller.java:87)
- locked <0x038517d0> (a com.install4j.runtime.installer.controller.CommandSink)
at com.install4j.runtime.installer.Installer.runInProcess(Installer.java:59)
at com.install4j.runtime.installer.Installer.main(Installer.java:46)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.exe4j.runtime.LauncherEngine.launch(LauncherEngine.java:65)
at com.exe4j.runtime.WinLauncher.main(WinLauncher.java:101)
at com.install4j.runtime.launcher.WinLauncher.main(WinLauncher.java:26)
Locked ownable synchronizers:
- None
"VM Thread" prio=10 tid=0x01012400 nid=0x1bf0 runnable
"VM Periodic Task Thread" prio=10 tid=0x17856000 nid=0x2fdc waiting on condition
JNI global references: 449
EDIT 6:下面是日志UpdateChecker.executeScheduledUpdate(Arrays.asList("-q","-Dinstall4j.keepLog=true","-Dinstall4j.alternativeLogfile=E:/install4j-log/log2.txt"), false, null);:
[INFO] logger started at Tue Sep 19 11:20:00 IST 2017
[INFO] executable name: C:\Users\Abhishek\Downloads\GreytipAstra_windows_3_0_1.exe
[INFO] install4j version: 7.0.1 (build 7043)
[INFO] Properties:
-- listing properties --
java.runtime.name=Java(TM) SE Runtime Environment
exe4j.moduleName=C:\Users\Abhishek\Downloads\GreytipAs...
sun.boot.library.path=c:\windows\temp\e4j554d.tmp_dir150580...
exe4j.semaphoreName=Local\c:_users_abhishek_downloads_gre...
java.vm.version=24.80-b11
java.vm.vendor=Oracle Corporation
java.vendor.url=http://java.oracle.com/
path.separator=;
exe4j.consoleCodepage=cp0
java.vm.name=Java HotSpot(TM) Client VM
file.encoding.pkg=sun.io
user.script=
user.country=US
sun.os.patch.level=
install4j.exeDir=C:\Users\Abhishek\Downloads\
java.vm.specification.name=Java Virtual Machine Specification
user.dir=C:\WINDOWS\TEMP\e4j554D.tmp_dir150580...
java.runtime.version=1.7.0_80-b15
java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment
java.endorsed.dirs=c:\windows\temp\e4j554d.tmp_dir150580...
os.arch=x86
java.io.tmpdir=C:\WINDOWS\TEMP\
line.separator=
java.vm.specification.vendor=Oracle Corporation
user.variant=
exe4j.tempDir=C:\WINDOWS\TEMP\e4j554D.tmp_dir150580...
os.name=Windows NT (unknown)
sun.java2d.noddraw=true
sun.jnu.encoding=Cp1252
java.library.path=C:\WINDOWS\TEMP\e4j554D.tmp_dir150580...
sun.awt.enableExtraMouseButtons=true
java.specification.name=Java Platform API Specification
java.class.version=51.0
sun.management.compiler=HotSpot Client Compiler
install4j.language=en
exe4j.isInstall4j=true
os.version=10.0
install4j.updateStorageDir=C:\WINDOWS\system32\config\systemprof...
user.home=C:\Windows\System32\config\systemprofile
user.timezone=Asia/Calcutta
java.awt.printerjob=sun.awt.windows.WPrinterJob
java.specification.version=1.7
file.encoding=Cp1252
user.name=ABHISHEK-PC$
java.class.path=C:\WINDOWS\TEMP\e4j554D.tmp_dir150580...
java.vm.specification.version=1.7
sun.arch.data.model=32
java.home=c:\windows\temp\e4j554d.tmp_dir150580...
sun.java.command=C:\Users\Abhishek\Downloads\GreytipAs...
exe4j.launchName=C:\Users\Abhishek\DOWNLO~1\GREYTI~1.EXE
java.specification.vendor=Oracle Corporation
user.language=en
awt.toolkit=sun.awt.windows.WToolkit
java.vm.info=mixed mode
exe4j.unextractedPosition=25300990
java.version=1.7.0_80
java.ext.dirs=c:\windows\temp\e4j554d.tmp_dir150580...
sun.boot.class.path=c:\windows\temp\e4j554d.tmp_dir150580...
java.vendor=Oracle Corporation
install4j.appDir=C:\Windows\Temp\
file.separator=\
java.vendor.url.bug=http://bugreport.sun.com/bugreport/
sun.cpu.endian=little
sun.io.unicode.encoding=UnicodeLittle
install4j.alternativeLogfile=E:/install4j-log/log2.txt
install4j.lockFile=C:\WINDOWS\system32\config\systemprof...
install4j.keepLog=true
sun.desktop=windows
sun.cpu.isalist=pentium_pro+mmx pentium_pro pentium+m...
[INFO] com.install4j.runtime.beans.actions.misc.RequestPrivilegesAction [ID 304]: Execute action
Property allRequested: false
Property failIfNotObtainedMac: true
Property failIfNotObtainedWin: true
Property failIfNotRootUnix: true
Property obtainIfAdminMac: false
Property obtainIfAdminWin: true
Property obtainIfNormalMac: false
Property obtainIfNormalWin: false
Property rollbackSupported: false
Property updateInstallationDirectory: true
Execute action successful after 1 ms
[INFO] com.install4j.runtime.beans.screens.StartupScreen [ID 1]: command: move 1 screens, executing actions, checking condition
[INFO] com.install4j.runtime.beans.screens.WelcomeScreen [ID 2]: Show screen
[INFO] checking writable with maximum
我建议更新到 install4j 7，它有很多新的自动更新功能，非常适合服务。
使用 install4j 7，您可以在安装程序 -> 屏幕和操作步骤中添加“后台更新下载程序”应用程序。该应用程序模板中的关键操作是“安排更新安装”操作。
在您的服务中，您可以像这样启动更新下载器：
ApplicationLauncher.launchApplication("<ID>", null, true, null);
在它自己的线程中<ID>替换为应用程序的 ID。此调用会被阻止，当它返回时，更新安装程序可能已被下载。您可以使用以下命令检查此情况
UpdateChecker.isUpdateScheduled()
现在您只需触发下载的安装程序的执行即可。您可以立即执行此操作，如果您不想终止服务，也可以在启动时执行此操作。您需要的代码片段是这样的：
UpdateChecker.executeScheduledUpdate(Arrays.asList("-q"), false, null);
作为更新安装的一部分，服务将关闭。服务无法自动重新启动（如果您通过了 GUI 启动器可以执行的操作）true作为上述方法调用的第二个参数），但必须通过“启动服务”操作来启动，您的安装程序中可能已经有该操作。
有关更多信息和屏幕截图，请参阅
https://www.ej-technologies.com/products/install4j/whatsnew7.html https://www.ej-technologies.com/products/install4j/whatsnew7.html
并搜索“后台自动更新”。