装oracle9i的时候怎么出来这种信息?

装oracle9i的时候怎么出来这种信息?

[oracle@localhost Disk1]$ Initializing Java Virtual Machine from /tmp/OraInstall2003-10-03_02-37-07AM/jre/bin/java. Please wait...
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified

Exception in thread "main" java.lang.InternalError: Can't connect to X11 window
server using ':0.0' as the value of the DISPLAY variable.
at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
at sun.awt.X11GraphicsEnvironment.(X11GraphicsEnvironment.java:59)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:120)
at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:58)
at java.awt.Window.(Window.java:188)
at java.awt.Frame.(Frame.java:315)
at java.awt.Frame.(Frame.java:262)
at oracle.sysman.oii.oiic.OiicInstaller.main(OiicInstaller.java:593)

[oracle@localhost Disk1]$      
su到root
然后执行xhost +
再运行就好了      
请问是什么意思?
具体怎么操作?
谢谢