shufflesimpletag.java

来自「一个java写的加密算法」· Java 代码 · 共 75 行

/*
 * Copyright 2004-2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/**
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 */

package samples.webapps.simple.jsp2.examples.simpletag;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.JspFragment;
import javax.servlet.jsp.tagext.SimpleTagSupport;
import java.util.HashMap;
import java.io.IOException;

/**
 * SimpleTag handler that accepts takes three attributes of type
 * JspFragment and invokes then in a random order.
 */
public class ShuffleSimpleTag extends SimpleTagSupport {
    private JspFragment fragment1;
    private JspFragment fragment2;
    private JspFragment fragment3;

    public void doTag() throws JspException, IOException {
        switch( (int)(Math.random() * 6) ) {
            case 0:
                fragment1.invoke( null );
                fragment2.invoke( null );
                fragment3.invoke( null );
                break;
            case 1:
                fragment1.invoke( null );
                fragment3.invoke( null );
                fragment2.invoke( null );
                break;
            case 2:
                fragment2.invoke( null );
                fragment1.invoke( null );
                fragment3.invoke( null );
                break;
            case 3:
                fragment2.invoke( null );
                fragment3.invoke( null );
                fragment1.invoke( null );
                break;
            case 4:
                fragment3.invoke( null );
                fragment1.invoke( null );
                fragment2.invoke( null );
                break;
            case 5:
                fragment3.invoke( null );
                fragment2.invoke( null );
                fragment1.invoke( null );
                break;
        }
    }

    public void setFragment1( JspFragment fragment1 ) {
        this.fragment1 = fragment1;
    }
    
    public void setFragment2( JspFragment fragment2 ) {
        this.fragment2 = fragment2;
    }
    
    public void setFragment3( JspFragment fragment3 ) {
        this.fragment3 = fragment3;
    }
}