自定义标签实现JSP页面计算两个时间类型变量的差，返回xx天xx小时xx分钟xx秒

最新推荐文章于 2022-11-29 10:41:13 发布

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最新推荐文章于 2022-11-29 10:41:13 发布

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分类专栏： JSP自定义标签文章标签： JSP自定义标签计算JSP页面日期差

本文链接：https://blog.youkuaiyun.com/AWM_Godlike/article/details/28426243

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1 篇文章

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本文介绍如何通过自定义JSP标签来展示两个日期之间的差值，包括毫秒、秒、分钟、小时及天数，并提供从创建标签类、定义TLD文件到在JSP页面中使用的完整步骤。

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第一步自定义标签类：

package com.ideal.hadoop.jobweb.web.tag;  //请不要照抄，看清楚包路径

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;
import java.util.Date;

/**
 * User: xushanshan
 * Date: 14-6-4
 * Time: 下午2:26
 * Function: 用于页面显示两个日期时间的差
 */
public class DateDiffTag extends TagSupport {

    private Date preDate;
    private Date laterDate;

    @Override

    public int doStartTag() throws JspException {
        try {
            JspWriter out = this.pageContext.getOut();
            if (preDate != null && laterDate != null) {
                long diff = laterDate.getTime() - preDate.getTime();
                long ss = diff % 1000;
                long tmp = diff / 1000; //秒
                long s = tmp % 60;
                tmp = tmp / 60; //分钟数
                long min = tmp % 60;
                tmp = tmp / 60; //小时数
                long hour = tmp % 24;
                long day = tmp / 24; //天数
                String diffString = "";
                if (day == 0) {
                    if (hour == 0) {
                        if (min == 0) {
                            diffString = s + "秒";
                        } else {
                            diffString = min + "分" + s + "秒";
                        }
                    } else {
                        diffString = hour + "小时" + min + "分" + s + "秒";
                    }
                } else {
                   diffString = day + "天" + hour + "小时" + min + "分" + s + "秒";
                }
                out.println(diffString);
                out.flush();
            }
        } catch (Exception e) {

        }
        return SKIP_BODY;
    }

    @Override
    public int doEndTag() throws JspException {
        return EVAL_PAGE;
    }

    @Override
    public void release() {
        super.release();
        this.preDate = null;
        this.laterDate = null;
    }

    public Date getPreDate() {
        return preDate;
    }

    public void setPreDate(Date preDate) {
        this.preDate = preDate;
    }

    public Date getLaterDate() {
        return laterDate;
    }

    public void setLaterDate(Date laterDate) {
        this.laterDate = laterDate;
    }
}

第二布新建mytaglib.tld

<tag-class>里面的内容不要照抄

请把http:// 补齐，是优快云的毛病啦

<?xml version="1.0" encoding="UTF-8"?>
<taglib version="2.0" xmlns="http:/java.sun.com/xml/ns/j2ee"
        xmlns:xsi="http:/www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http:/java.sun.com/xml/ns/j2ee web-jsptaglibrary_2_0.xsd">
    <tlib-version>1.0</tlib-version>
    <jsp-version>2.0</jsp-version>
    <short-name>dateDiff</short-name>
    <uri>/myTaglib</uri>
    <tag>
        <name>showDateDiff</name>
        <tag-class>com.ideal.hadoop.jobweb.web.tag.DateDiffTag</tag-class>
        <body-content>empty</body-content>
        <attribute>
            <name>preDate</name>
            <required>true</required>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
        <attribute>
            <name>laterDate</name>
            <required>true</required>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
    </tag>
</taglib>

第三步配置到web.xml中

<location>写对应的tld位置不要照抄

<jsp-config>
        <taglib>
            <taglib-uri>/myTaglib</taglib-uri>
            <taglib-location>/WEB-INF/tld/mytaglib.tld</taglib-location>
        </taglib>
    </jsp-config>

第四步 JSP页面引用

<%@ taglib uri="/myTaglib" prefix="dateDiff" %>

第五步 JSP页面使用

<dateDiff:showDateDiff preDate="${executeTime}" laterDate="${finishTime}"></dateDiff:showDateDiff>

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