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摘要: html与jsp开发分离技术
// 替换字符串函数
// String strSource - 源字符串
// String strFrom - 要替换的子串
// String strTo - 替换为的字符串
public static String replace(String strSource, String strFrom, String strTo)
{
// 如果要替换的子串为空,则直接返回源串
if(strFrom == null || strFrom.equals(""))
return strSource;
String strDest = "";
// 要替换的子串长度
int intFromLen = strFrom.length();
int intPos;
// 循环替换字符串
while((intPos = strSource.indexOf(strFrom)) != -1)
{
// 获取匹配字符串的左边子串
strDest = strDest + strSource.substring(0,intPos);
// 加上替换后的子串
strDest = strDest + strTo;
// 修改源串为匹配子串后的子串
strSource = strSource.substring(intPos + intFromLen);
}
// 加上没有匹配的子串
strDest = strDest + strSource;
// 返回
return strDest;
}
<?xml version="1.0" encoding="ISO-8859-1" ?>
taglib
PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
"http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
1.0
1.2
ListBook
com.book.taglib.ListBookTag
<body-content>JSP</body>
package com.book.taglib;
import java.util.*;
import java.lang.*;
import com.book.model.bookmodel;
import com.book.utils.StringHelper;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.tagext.BodyTagSupport;
import javax.servlet.jsp.tagext.BodyContent;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.JspWriter;
import javax.servlet.ServletRequest;
public class ListBookTag extends BodyTagSupport {
// 标志开始位置执行
public int doStartTag(){
return EVAL_BODY_BUFFERED;
}
// 标志结束位置执行
public int doEndTag()throws JspTagException {
int max = 0;
String ListBody = null;
int number = 1;
// 获取页码信息,也就是request对象中的内容
String serialNo = pageContext.getRequest().getParameter("serialNo");
// 转换为整数
try{
number = Integer.parseInt(serialNo);
}
catch(Exception e){
number = 1;
}
if (number < 1)
number = 1;
// 获取保存在Session中的数据集,当然这里也可以从数据库中取数据
Vector bookVector = (Vector)pageContext.getSession().getAttribute("bookVector");
if(number*10max = number*10;
else
max = bookVector.size();
if(bookVector.size()>0){
// 获取标签内部的内容
BodyContent bc = getBodyContent();
for (int i = (number - 1) * 10; i < max; i++) {
// 获取一条记录
bookmodel model = (bookmodel) bookVector.get(i);
if (model == null)
model = new bookmodel();
// 替换内容(就是在这里输出数据的,替换)
String body = bc.getString();
body = StringHelper.replace(body, "$_SerialNo", model.getBookid());
body = StringHelper.replace(body, "$_BookName", model.getBookname());
body = StringHelper.replace(body, "$_Author", model.getAuthor());
body = StringHelper.replace(body, "$_PHouse", model.getPhouse());
body = StringHelper.replace(body, "$_Price", model.getPrice().toString());
body = StringHelper.replace(body, "$_index", Integer.toString(i));
// 向页面输出
try{
pageContext.getOut().print(body);
}
catch(Exception e){
}
}
}
return EVAL_PAGE;
}
}
<%@page contentType="text/html; charset=GBK"%>
<%@ taglib uri="/MyBookTag" prefix="MyBookTag" %>
<head>一个基于J2EE的图书DEMO
<script language="javascript">
function returnBack(){
document.form1.action = "BookAdmin.jsp";
}
</script>
</head>
<body bgcolor="#FFFFFF" text="#000000" leftmargin="0" topmargin="0">图书列表
<form name="form1" method="post">
<table width="750" border="1" cellspacing="0" align="center" cellpadding="3" bordercolor="#A5ABB6" bordercolordark="#ffffff">
<tr align="center">
<td width="100" bgcolor="FEFBF4" height="41">序号</td>
<td width="200" bgcolor="FEFBF4" height="41">图示名称</td>
<td width="100" bgcolor="FEFBF4" height="41">图书作者</td>
<td width="200" bgcolor="FEFBF4" height="41">出版社</td>
<td width="50" bgcolor="FEFBF4" height="41">图书价格</td>
<td width="100" bgcolor="FEFBF4" height="41">操作</td>
</tr>