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自定义标�{?date

ywm — Mon, 04 Mar 2013 08:35:00 GMT

步骤:
1. 定义tld标签描述文�g
2. 新徏class�l�承SimpleTagSupport或者BodyTagSupport
3. taglib命��o声明
4. 使用自定义标�{?br />
1. 定义tld标签描述文�gcustom_tag.tld

xml version="1.0" encoding="UTF-8"?>
<taglib 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 http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
    version="2.0">
    <description>JSTL 1.1 core librarydescription>
    <display-name>JSTL coredisplay-name>
    <tlib-version>1.1tlib-version>
    <short-name>ctshort-name>

    <uri>http://www.customtag.com/custom_taguri>

    <tag>

        <name>datename>

        <tag-class>com.customtag.tags.DateTagtag-class>

        <body-content>emptybody-content>
        <attribute>

            <name>formatname>

            <required>falserequired>

            <rtexprvalue>falsertexprvalue>
        attribute>
        <attribute>
            <name>valuename>
            <required>falserequired>
            <rtexprvalue>truertexprvalue>
        attribute>
    tag>
taglib>

�?
可参考jstl-[version].jar中META-INF下的c.tld文�g

2. 新徏DateTag�l�承SimpleTagSupport或者BodyTagSupport

package com.customtag.tags;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.SimpleTagSupport;

public class DateTag extends SimpleTagSupport {

    @Override
    public void doTag() throws JspException, IOException {
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        PageContext pc = (PageContext) getJspContext();
        JspWriter out = pc.getOut();
        try{
            if(null != this.getValue()){
                out.print(sdf.format(new Date(this.getValue())));
            }else{
                out.print(sdf.format(new Date()));
            }
        }catch(IOException e){
            throw e;
        }catch(Exception e){
            out.print("");
        }
    }

    private String format="yyyy-MM-dd HH:mm:ss";

    private Long value = null;

    public String getFormat() {
        return format;
    }

    public void setFormat(String format) {
        this.format = format;
    }

    public Long getValue() {
        return value;
    }

    public void setValue(Long value) {
        this.value = value;
    }

}

3. taglib命��o声明

<%@taglib prefix="ct" uri="http://www.customtag.com/custom_tag"%>

4. 使用自定义标�{?br />

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://"
            + request.getServerName() + ":" + request.getServerPort()
            + path + "/";
%>
<%@taglib prefix="ct" uri="http://www.customtag.com/custom_tag"%>

DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
    <head>
        <base href="<%=basePath%>">

        <title>My JSP 'index.jsp' starting pagetitle>
        <meta http-equiv="pragma" content="no-cache">
        <meta http-equiv="cache-control" content="no-cache">
        <meta http-equiv="expires" content="0">
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
        <meta http-equiv="description" content="This is my page">

    head>

    <body>
        自定义标�{�测�?nbsp;:
        <br>
        <ct:date/><br/>
        <ct:date format="MM/dd/yyyy"/><br/>
        <ct:date format="yyyy�q�MM月dd�?nbsp;HH时mm分ss�U? value="<%=new Date().getTime() %>"/><br/>
    body>
html>

[�q�行�l�果]
自定义标�{�测�?
2013-03-04 16:18:29
03/04/2013
2013�q?3�?4�?16�?8�?9�U?br />

ywm 2013-03-04 16:35 发表评论

boolean 转换 (05)

ywm — Fri, 01 Mar 2013 09:51:00 GMT

以下情况被认�?false :

boolean�c�d��的FALSE
int�c�d��?
��点�c�d��?.0
字符�?" 或�?"0"
�I�的数组
�I�的对象null

其他情况都认为是true

ywm 2013-03-01 17:51 发表评论

执行�q�算�W?(``) (04)

ywm — Fri, 01 Mar 2013 08:30:00 GMT

用于执行控制台命�?br />

$output = `ls -al`;
echo "

$output

有对�q�_��依赖�? 降低了php跨��^台能�?/span>

ywm 2013-03-01 16:30 发表评论

错误控制�q�算�W?@ (03)

ywm — Fri, 01 Mar 2013 08:25:00 GMT

用于忽略掉错误信�?br />

//忽略包含文�g时��生的错误
@include("inc.php");
//忽略�q�接mysql数据库出错��生的错误信息
$conn = @mysql_connect("localhost","username","password");
//忽略打开文�g产生的错误信�?/span>
$fp = @fopen("user.xml","w");
function test(){
return 10;
}
//忽略调用函数��p�|产生的错误信�?/span>
$number = @test();
?>

ywm 2013-03-01 16:25 发表评论

jQuery : serialize �?serializeArray �Ҏ��

ywm — Fri, 01 Mar 2013 07:42:00 GMT

serialize : 序列表表格内容�ؓ字符�? �q�回的是一个字�W�串

var serializeStr = $("form").serialize();

result : username=forrest&passwd=1234&gender=0&interest=swimming&interest=running&interest=readBook

serializeArray : 序列化表格元�?(�c�M�� '.serialize()' �Ҏ��) �q�回 JSON 数据�l�构数据

var fields = $("select, :radio").serializeArray();
jQuery.each( fields, function(i, field){
$("#results").append(field.name + "=" +field.value + "; ");
});

result : username=forrest; passwd=1234; gender=0; interest=swimming; interest=running; interest=readBook;

ywm 2013-03-01 15:42 发表评论

ywm — Wed, 27 Feb 2013 07:57:00 GMT

Class.forName("binary name");
加蝲�q�对�c�d��量进行初始化
�{��hcl.loadClass("binary name").newInstance();

ClassLoader.loadClass("binary name");
ClassLoader cl = this.getClass().getClassLoader();
Class c = cl.loadClass("binary name");
Object obj = c.newInstance();
在newInstance时初始化
初始化时会比forName多��生一个obj对象

From : http://waryist.iteye.com/blog/131983

ywm 2013-02-27 15:57 发表评论

js �~�码

ywm — Wed, 27 Feb 2013 03:44:00 GMT

escape/unescape : 不能对uri�~�码, 会把 / ? @ �q�行�~�码
encodeURIComponet/decodeURIComponent : 对URI参数�~�码, 会把 / �q�行�~�码
encodeURI/decodeURI : 对URI�~�码

From : http://blog.163.com/free_for_all/blog/static/6871811201192441843281/
From : http://www.cnblogs.com/qiantuwuliang/archive/2009/07/19/1526687.html

ywm 2013-02-27 11:44 发表评论

uri url �ȝ��

ywm — Wed, 27 Feb 2013 02:59:00 GMT

uri : Uniform Resource Identifier �l�一资源标识
url : Uniform Resource Locator �l�一资源定位

�?
url是uri的一个子�?br />url可以用相对�\径表�C? url 只能用绝对�\径表�C?br />
�?
url,uri 都能定位唯一资源

�?
[scheme:][//authority][path][?query][#fragment]
authority为[user-info@]host[:port]
相对路径和绝对�\径看是否使用"scheme:"开�?br />
From : http://www.cnblogs.com/gaojing/archive/2012/02/04/2413626.html
From : http://rebecca.iteye.com/blog/234724

ywm 2013-02-27 10:59 发表评论

jQuery �?prototype 冲突

ywm — Tue, 26 Feb 2013 02:38:00 GMT

//��jQuery�?函数改名�?jq
var $jq = jQuery.noConflict();
//$('d1').innerHTML = 'hello jQuery';
$jq('#d1').html('hello jQuery');

ywm 2013-02-26 10:38 发表评论

帔R�� (02)

ywm — Tue, 26 Feb 2013 02:02:00 GMT

语法:

1 2 define("CONSTANT", "Hello world.");
3 echo CONSTANT; // 输出 "Hello world."
4 ?>

规则:

帔R��前面没有��元�W�号�Q?tt>$�Q?/li>
帔R��只能用define()函数定义�Q�而不能通过赋��D��?/li>
帔R��一旦定义就不能被重新定义或者取消定�?/li>
帔R��的值只能是标量(integer,float,string,boolean)

��术帔R��:

名称	说明
`__LINE__`	文�g中的当前行号�?
`__FILE__`	文�g的完成�\径和文�g名�?
`__FUNCTION__`	函数名称。（�q�是 PHP 4.3.0 新加的。）
`__CLASS__`	�cȝ��名称。（�q�是 PHP 4.3.0 新加的。）

ywm 2013-02-26 10:02 发表评论