parametertag.java

来自「招标投标网上系统」· Java 代码 · 共 66 行

/*
 * $Id: ParameterTag.java,v 1.6 2001/10/26 22:55:55 ro89390 Exp $
 * Copyright 2000 Sun Microsystems, Inc. All rights reserved.
 * Copyright 2000 Sun Microsystems, Inc. Tous droits r?erv?.
 */

package com.neusoft.taglibs.request;

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

import com.neusoft.util.*;

/**
 *
 * This class allows you to retrieve a parameter from
 * the request and output it to the page  This should allow
 * you to avoid expressions for extracting parameter info.
 *
 */
public class ParameterTag
    extends TagSupport {

  private String parameter = null;
  private String defaultValue = "";
  private boolean asURL;

  public ParameterTag() {
    super();
  }

  public void setName(String p) {
    parameter = p;
  }

  public void setDefault(String d) {
    defaultValue = d;
  }

  public int doStartTag() throws JspTagException {
    return SKIP_BODY;
  }

  public int doEndTag() throws JspTagException {
    String outputText = "";
    try {
      if (parameter != null) {
        outputText = pageContext.getRequest().getParameter(parameter);
        if (outputText != null) {
          pageContext.getOut().print(CommonUtil.toZn(outputText));
        }
        else {
          pageContext.getOut().print(defaultValue);
        }
      }
      else {
        pageContext.getOut().print(defaultValue);
      }
    }
    catch (Exception ex) {
      System.err.println("Parameter Tag:doEndTag caught: " + ex);
    }
    return EVAL_PAGE;
  }
}