/*
实现功能：自定义标签控制JSP内容显示还是不显示
日期：20131001
作者：烟大阳仔
*/
1.编写一个实现tag接口的JAVA类实现的是SimpleTagSupport
@Override
public void doTag() throws JspException, IOException {
JspFragment jf=this.getJspBody();
jf.invoke(this.getJspContext().getOut());//如果注释掉的话不输出信息
super.doTag();
}
2.在tld文件中对标签处理器进行描述（tld文件的位置WEB-INF里面）
<?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>A tag library exercising SimpleTag handlers.</description>
<tlib-version>1.0</tlib-version>
<short-name>SimpleTagDemo1</short-name>
<uri>/SimpleTagDemo1</uri>
<tag>
<name>Demo1</name>
<tag-class>cn.com.web.simpleTag.SimpleTagDemo1</tag-class>
<body-content>scriptless</body-content>
</tag>
</taglib>
3.在jsp页面中使用标签
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="/SimpleTagDemo1" prefix="SimpleTagDemo1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>用简单标签控制是否执行</title>
</head>
<body>
<SimpleTagDemo1:Demo1>
大家好！我是阳仔！
</SimpleTagDemo1:Demo1>
</body>
</html>
-------------------------------------------------------------------------------------------------------------
/*
实现功能：自定义简单标签控制内容循环输出
日期：20131001
作者：烟大阳仔
*/
1.编写一个实现tag接口的JAVA类实现的是SimpleTagSupport
@Override
public void doTag() throws JspException, IOException {
JspFragment jf=this.getJspBody();
for(int i=0;i<5;i++)
jf.invoke(null);
//jf.invoke(this.getJspContext().getOut());
}
2.在tld文件中对标签处理器进行描述（tld文件的位置WEB-INF里面）
<?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>A tag library exercising SimpleTag handlers.</description>
<tlib-version>1.0</tlib-version>
<short-name>simpleDemo2</short-name>
<uri>/simpleDemo2</uri>
<tag>
<name>Demo2</name>
<tag-class>cn.com.web.simpleTag.SimpleTagDemo2</tag-class>
<body-content>scriptless</body-content>
</tag>
</taglib>
3.在jsp页面中使用标签
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="/simpleDemo2" prefix="simpleDemo2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>简单标签循环输出</title>
</head>
<body>
<simpleDemo2:Demo2>
循环输出该内容五次
</simpleDemo2:Demo2>
</body>
</html>
-------------------------------------------------------------------------------------------------------------
/*
实现功能：自定义简单标签修改JSP的内容
日期：20131001
作者：烟大阳仔
*/
1.编写一个实现tag接口的JAVA类实现的是SimpleTagSupport
public void doTag() throws JspException, IOException {
JspFragment jf=this.getJspBody();
StringWriter sw=new StringWriter();
jf.invoke(sw);
String content=sw.toString();
content=content.toUpperCase();
this.getJspContext().getOut().write(content);
}
2.在tld文件中对标签处理器进行描述（tld文件的位置WEB-INF里面）
<?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>A tag library exercising SimpleTag handlers.</description>
<tlib-version>1.0</tlib-version>
<short-name>SimpleDemo3</short-name>
<uri>/SimpleDemo3</uri>
<tag>
<name>Demo3</name>
<tag-class>cn.com.web.simpleTag.SimpleTagDemo3</tag-class>
<body-content>scriptless</body-content>
</tag>
</taglib>
3.在jsp页面中使用标签
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="/SimpleDemo3" prefix="SimpleDemo3" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<SimpleDemo3:Demo3>
hell world!
</SimpleDemo3:Demo3>
</body>
</html>
-------------------------------------------------------------------------------------------------------------
/*
实现功能：自定义简单标签控制整个页面内容的显示
日期：20131001
作者：烟大阳仔
*/
1.编写一个实现tag接口的JAVA类实现的是SimpleTagSupport
public void doTag() throws JspException, IOException {
throw new SkipPageException();
}
2.在tld文件中对标签处理器进行描述（tld文件的位置WEB-INF里面）
<?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>A tag library exercising SimpleTag handlers.</description>
<tlib-version>1.0</tlib-version>
<short-name>SimpleDemo4</short-name>
<uri>/SimpleDemo4</uri>
<tag>
<name>Demo4</name>
<tag-class>cn.com.web.simpleTag.SimpleTagDemo4</tag-class>
<body-content>empty</body-content>
</tag>
</taglib>
3.在jsp页面中使用标签
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="/SimpleDemo4" prefix="SimpleDemo4" %>
<SimpleDemo4:Demo4/>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>控制整个页面内容是否输出</title>
</head>
<body>
</body>
</html>
