JSP自定义标签之Hello Costom tag小例子

1、项目结构

2、实现自定义tag所需依赖

<dependency>

      <groupId>javax.servlet</groupId>

      <artifactId>servlet-api</artifactId>

      <version>2.5</version>

      <scope>provided</scope>

    </dependency>

    <dependency>

      <groupId>javax.servlet.jsp</groupId>

      <artifactId>jsp-api</artifactId>

      <version>2.2</version>

      <scope>provided</scope>

    </dependency>

3、HelloTag.java

package com.tag;

import javax.servlet.jsp.JspException;

import javax.servlet.jsp.JspWriter;

import javax.servlet.jsp.tagext.SimpleTagSupport;

import java.io.IOException;

/**

 * Created by Administrator on 2016/7/11.

 */

public class HelloTag extends SimpleTagSupport {

    @Override

    public void doTag() throws JspException, IOException {

        JspWriter out = getJspContext().getOut();

        out.println("Hello Custom Tag!");

    }

}

4、costom.tld

<taglib>

    <tlib-version>1.0</tlib-version>

    <jsp-version>2.0</jsp-version>

    <short-name>Example TLD</short-name>

    <tag>

        <name>Hello</name>

        <tag-class>com.tag.HelloTag</tag-class>

        <body-content>empty</body-content>

    </tag>

</taglib>

5、index.jsp

<%@ taglib prefix="ex" uri="../WEB-INF/custom.tld"%>

<html>

<body>

<h2>Hello World!</h2>

<form action="test1" method="post" id="form1">

    <input type="submit" name="submit" value="button">

</form>

<ex:Hello></ex:Hello>

</body>

</html>

注：这里需要引入标签库

<%@ taglib prefix="ex" uri="../WEB-INF/custom.tld"%>

6、结果

　　 JSP自定义标签之Hello Costom tag小例子