checkboxtag.java

一个专门用来快速开发网站的框架

package com.core.taglib;

import org.apache.commons.logging.*;
import com.opensymphony.webwork.views.jsp.*;

public class CheckBoxTag extends BaseTag {
    private static Log log = LogFactory.getLog(CheckBoxTag.class);
    boolean checked = false;

    public CheckBoxTag() {
    }

    public int doStartTag() throws javax.servlet.jsp.JspException {
        return SKIP_BODY;
    }

    public int doEndTag() throws javax.servlet.jsp.JspException {
        try {
            pageContext.getOut().print(getHtmlStr());
        } catch (Exception e) {
            throw new javax.servlet.jsp.JspException(e);
        }
        return EVAL_BODY_INCLUDE;
    }

    //得到独特属性的字符串
    public String getSelfStr() {
        StringBuffer bufSelf = new StringBuffer();

        return bufSelf.toString();
    }

    //得到最终的字符串
    public String getHtmlStr() {
        String ret = "";
        // step1:处理直接输出的普通属性。
        String strComm = super.getCommHtml();
//        log.info("普通属性的字符串是："+strComm);

        // 检查OgnlValueStack中的值。
        Object stackObject = TagUtils.getStack(this.pageContext).findValue(name);
        if (null != stackObject) { //有值
            ret = "<input type=\"checkbox\" " + strComm + (getValue() != null ? " value=\"" + getValue() + "\"" : " value=\"" + stackObject.toString() + "\"") +
                (getValue() != null && ( (stackObject.toString() + ",").indexOf(getValue() + ",") != -1) ? " checked" : "") + ">";
//            log.info("在OgnlValueStack找到了" + name + "! 它的值是：" + value);
        } else { //没值
            ret = "<input type=\"checkbox\" " + strComm + (getValue() != null ? " value=\"" + getValue() + "\"" : "") + (isChecked() ? " checked" : "") + ">";
        }
        return ret;
    }

    public boolean isChecked() {
        return checked;
    }

    public void setChecked(boolean checked) {
        this.checked = checked;
    }
}