keytool -genkey -alias android.keystore -keyalg RSA -validity 100000 -keystore android.keystore

参数意义：-validity主要是证书的有效期，写100000天；空格，退格键都算密码。

(D:\Program Files\Java\jdk1.7.0_25\bin> keytool -genkey -alias android.keystore -keyalg RSA -validity 100000 -keystore android.keystore
输入keystore密码： android
您的名字与姓氏是什么？
[Unknown]： sxl
您的组织单位名称是什么？
[Unknown]： xs
您的组织名称是什么？
[Unknown]： xs
您所在的城市或区域名称是什么？
[Unknown]： null
您所在的州或省份名称是什么？
[Unknown]： null
该单位的两字母国家代码是什么
[Unknown]： null
CN=sxl, OU=xs, O=xuesheng, L=null, ST=null, C=null 正确吗？
[否] y
输入<android.keystore>的主密码
（如果和keystore密码相同，按回车）：)

[liuaibin@centos6 ~]$ keytool -genkey -alias android.keystore -keyalg RSA -validity 100000 -keystore android.keystore
Enter keystore password:  
Re-enter new password: 
What is your first and last name?
  [Unknown]:  sxl
What is the name of your organizational unit?
  [Unknown]:  xs
What is the name of your organization?
  [Unknown]:  xs
What is the name of your City or Locality?
  [Unknown]:  null
What is the name of your State or Province?
  [Unknown]:  null
What is the two-letter country code for this unit?
  [Unknown]:  null
Is CN=sxl, OU=xs, O=xs, L=null, ST=null, C=null correct?
  [no]:  y

Enter key password for <android.keystore>
    (RETURN if same as keystore password):