在cmd窗口(需要以管理员身份运行)，

cd %JAVA_HOME% 

只有在设置了系统环境变量JAVA_HOME后才有效。要为路径设置系统变量，可以这样做

setx %JAVA_HOME% C:\Java\jdk1.8.0_121\

然后你就可以打字了

cd c:\Java\jdk1.8.0_121\bin

or

cd %JAVA_HOME%\bin

然后，执行JAVA jdk提供的任何命令，例如

keytool -genkey -v -keystore myapp.keystore -alias myapp

你只需要按回车键后回答问题(相当于在cmd行上输入值)!密钥将被生成

KeyTool是JDK的一部分。假设您使用默认设置安装了JDK，您将在$JAVA_HOME/bin中找到它

keytool位于JDK的bin目录下($JAVA_HOME/bin)。JAVA_HOME是JDK安装目录。 要使用该命令行，还应该在PATH环境变量中包含$JAVA_HOME/bin。

Few observations while I was getting the same problem (Windows). 1. Shell pipe is important. 2. If you are using OpenSSL or Cygwin, definitely you have to install it. 3. keytool comes with JDK so either you have to point to it in the command or you have cd to the JDK/bin folder (where the exe resides) 4. The debug keystore is typically located at ~/.android/debug.keystore 5. password is "android" whether you -keypass it or type it when prompted. 6. For the alias name, you can open (DO NOT SAVE, just open and close) the keystore file with any editor and read it. 7. MOST IMPORTANT - There is a difference is specifying the keystore path within quotes and without. I got it working by using the keystore path within the double quotes. As remix090378 said and as per the instruction, this command indeed worked - cd C:\Program Files\Java\jdk1.7.0_09\bin

keytool -exportcert -alias androiddebugkey -keystore "C:\Users\userName.android\debug. keystore "密钥存储库" -list -v

在Windows上

如果你使用Jetbrain的工具箱来管理Android Studio更新，路径是这样的

C:\Users\{USERNAME}\AppData\Local\JetBrains\Toolbox\apps\AndroidStudio\ch-0\202.7486908\jre\bin 

更新后，我必须手动更新/设置此路径为JAVA_HOME (jre文件夹)

KEYTOOL在JAVAC SDK中，所以你必须在包含jns JAVAC的目录中找到它