filtertag.java

来自「beginJsp2.0外文书籍源代码」· Java 代码 · 共 48 行

package custom;

import java.util.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;

public class filterTag extends BodyTagSupport
{
  public int doStartTag()
  {
    return EVAL_BODY_BUFFERED;
  }

  public int doAfterBody() throws JspException
  {
    String cleanString = "";
    BodyContent bc = getBodyContent();

    // Get bc as a string
    String unfiltered = bc.getString();

    // StringTokenizer splits the string into tokens, using spaces as the
    // delimiters 
    StringTokenizer st = new StringTokenizer(unfiltered); 

    while (st.hasMoreTokens())
    {
      String temp = st.nextToken();

      // Censor if we find the dreaded word
      if(temp.equalsIgnoreCase("drat"))
        temp = "****";

      // Add a space between each word
      cleanString += " " + temp; 
    }
    try
    {
      getPreviousOut().print(cleanString);
    }
    catch(Exception e)
    {
      throw new JspException(e.toString());
    }
    return SKIP_BODY;
  }
}