html向applet传参数

[longzhu007]

<param name="Username" value="etlin">
<param name="IPaddr" value="etlin">
<param name="Password" value="etlin">
==============================
public MyApplet() throws HeadlessException {


String name = this.getParameter("Username");
String ip = this.getParameter("IPaddr");
String pw =this.getParameter("Password");
S_O_L mainFrame=new S_O_L(ip,name,pw);//创建你swing项目的主窗口
mainFrame.setVisible(false);
this.setContentPane(mainFrame.getContentPane());
}
报java.lang.NullPointerException

[longzhu007]

public void init()
{
String name = this.getParameter("Username");
String ip = this.getParameter("IPaddr");
String pw =this.getParameter("Password");
}