oracle官网的所有jdk的下载地址如下：
https://www.oracle.com/technetwork/java/archive-139210.html
jdk11生成jre的方法（注意不同的系统要在指定的系统生成和java的路径）：
import os
jmod_str = os.popen('/vagrant/jdk-11.0.4/bin/java --list-modules').read()
init = jmod_str.index('@')
end = jmod_str.index('\n')
version = jmod_str[init:end]
jmod_list = jmod_str.replace(version, '').replace('\n', ',')
jmod_list = jmod_list[:-1] if jmod_list[-1] == ',' else jmod_list
cmd = 'jlink --no-header-files --no-man-pages --compress=2 --module-path ../jmods --add-modules '+ jmod_list + ' --output ../jre'
print cmd
获取到的cmd的命令为：
./jlink --no-header-files --no-man-pages --compress=2 --module-path ../jmods --add-modules java.base,java.compiler,java.datatransfer,java.desktop,java.instrument,java.logging,java.management,java.management.rmi,java.naming,java.net.http,java.prefs,java.rmi,java.scripting,java.se,java.security.jgss,java.security.sasl,java.smartcardio,java.sql,java.sql.rowset,java.transaction.xa,java.xml,java.xml.crypto,jdk.accessibility,jdk.aot,jdk.attach,jdk.charsets,jdk.compiler,jdk.crypto.cryptoki,jdk.crypto.ec,jdk.dynalink,jdk.editpad,jdk.hotspot.agent,jdk.httpserver,jdk.internal.ed,jdk.internal.jvmstat,jdk.internal.le,jdk.internal.opt,jdk.internal.vm.ci,jdk.internal.vm.compiler,jdk.internal.vm.compiler.management,jdk.jartool,jdk.javadoc,jdk.jcmd,jdk.jconsole,jdk.jdeps,jdk.jdi,jdk.jdwp.agent,jdk.jfr,jdk.jlink,jdk.jshell,jdk.jsobject,jdk.jstatd,jdk.localedata,jdk.management,jdk.management.agent,jdk.management.jfr,jdk.naming.dns,jdk.naming.rmi,jdk.net,jdk.pack,jdk.rmic,jdk.scripting.nashorn,jdk.scripting.nashorn.shell,jdk.sctp,jdk.security.auth,jdk.security.jgss,jdk.unsupported,jdk.unsupported.desktop,jdk.xml.dom,jdk.zipfs --output ../jre