window环境变量注册表位置，可用来编程配置JDK

计算机HKEY_LOCAL_MACHINESYSTEMControlSet001ControlSession ManagerEnvironment

RegistryKey localMachine = Registry.LocalMachine.OpenSubKey("SYSTEM\ControlSet001\Control\Session Manager\Environment", true);
localMachine.SetValue("JAVA_HOME", "jdk目录位置");
string str = localMachine.GetValue("Path").ToString();
localMachine.SetValue("Path", "%JAVA_HOME%\bin;" + str);
MessageBox.Show("配置成功！");
localMachine.Close();