jsp:tld标签
z注意每个uri地址要保持统一
1.创建MytagPrinta.java文件
package cn.tag;
import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.tagext.TagSupport;
public class MytagPrinta extends TagSupport {
/**
*
*/
private static final long serialVersionUID = 1L;
protected String value = null;
protected String type = "0";
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
@Override
public int doStartTag() throws JspException {
// TODO Auto-generated method stub
try {
if(type.equals("0"))
{
pageContext.getOut().println("hello:" + value);
}else{
pageContext.getOut().print("hell:"+value+"<br>");
}
} catch (IOException e) {
// TODO Auto-generated catch block
throw new JspTagException( e.getMessage() );
}
return SKIP_PAGE;
}
@Override
public int doEndTag() throws JspException {
// TODO Auto-generated method stub
return EVAL_PAGE;
}
}
2.配置web-info下的web.xml文件
<jsp-config>
<taglib>
<taglib-uri>http://www.tag.com/mytag</taglib-uri>
<taglib-location>/WEB-INF/mytlds/mytag.tld</taglib-location>
</taglib>
</jsp-config>
3.web-info下的mytlds文件夹下创建 mytag.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>mytag 带type和value属性的打印</description> <display-name>mytag 标签库</display-name> <tlib-version>1.0</tlib-version> <short-name>mytag</short-name> <uri>http://www.tag.com/mytag</uri> <tag> <description>打印value和type</description> <name>printa</name> <tag-class>cn.tag.MytagPrinta</tag-class> <body-content>empty</body-content> <attribute> <name>type</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>value</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag> </taglib>
4.新建tag.jsp文件。调用
<%@ page language="java" contentType="text/html; charset=utf-8"%> <%@ taglib prefix="mytag" uri="http://www.tag.com/mytag" %> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>带属性标签实例</title> </head> <body> <h3>调用带属性的print标签</h3> 打印后换行: <mytag:printa value="print" type="1"/> 打印后不换行:<mytag:printa value="printa" type="0"/> </body> </html>
