JavaWeb---自定义带参参数
packagecom.msit.tag;
importjava.io.IOException;
importjavax.servlet.jsp.JspException;
importjavax.servlet.jsp.JspWriter;
importjavax.servlet.jsp.tagext.TagSupport;
/**
* 定义第一个输出内容的自定义标签处理类
*
* @author admin
*
*/
@SuppressWarnings("serial")
publicclass MytagPrint extends TagSupport {
// 输出类型
private String type; // table ul
private int count;// 循环次数
private String context;// 输出的内容
@Override
public int doStartTag() throws JspException {
// 创建页面输出对象
JspWriter out = pageContext.getOut();
try {
if (type.equals("table")) {
out.print(" for (int i = 0; i < count; i++) { out.print(" out.print(" out.print(" out.print(" } out.print("");
");");
");"+ context + " ");"+ context + " ");
} else if (type.equals("ul")){
out.print("");
for (int i = 0; i < count; i++) {
out.print("
}
out.print("");
} else {
out.print(context);
}
} catch (IOException e) {
e.printStackTrace();
}
return SKIP_BODY;// skip 跳过或忽略
}
@Override
public int doEndTag() throws JspException {
return EVAL_PAGE;// eval 评估或处理
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public int getCount() {
return count;
}
public void setCount(int count) {
this.count = count;
}
public String getContext() {
return context;
}
public void setContext(String context) {
this.context = context;
}
}Tld文件配置:
<attribute>
<description>值描述:可以输入table或者uldescription>
<name>typename>
<required>truerequired>
<rtexprvalue>falsertexprvalue>
<type>java.lang.Stringtype>
attribute>
<attribute>
<description>指定循环的次数description>
<name>countname>
<required>truerequired>
<rtexprvalue>falsertexprvalue>
<type>java.lang.Integertype>
attribute>
<attribute>
<description>指定循环输出的内容description>
<name>contextname>
<rtexprvalue>falsertexprvalue>
<type>java.lang.Stringtype>
attribute>
Web文件配置
<jsp-config>
<taglib>
<taglib-uri>/msit/myprinttaglib-uri>
<taglib-location>/WEB-INF/Myprint.tldtaglib-location>
taglib>
jsp-config>
Jsp页面调用:
<%@ page language="java"import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/msit/myprint"prefix="p"%>
<%
Stringpath = request.getContextPath();
StringbasePath = request.getScheme() + "://"
+request.getServerName() + ":" + request.getServerPort()
+path + "/";
%>
DOCTYPE HTML PUBLIC "-//W3C//DTDHTML 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>
<h1>调用自定义标签:h1>
<h3>按表格格式输出:h3>
<p:myprint type="table" count="4"context="这是表格输出!" />
<hr>
<h3>按列表格式输出:h3>
<p:myprint type="ul" count="3"context="这是列表输出!" />
<hr>
<h3>按其他格式输出:h3>
<p:myprint type="div" count="5"context="没有这个选项 ,少年!" />
<br>
body>
html>