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

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<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>
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 3、HelloTag.java

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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!");
    }
}
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4、costom.tld

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<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>
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5、index.jsp

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<%@ 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>
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注：这里需要引入标签库

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

6、结果

　　

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