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개발/Spring Boot

11.Tag Library

by 카리3 2021. 2. 15.

1. 커스텀태그 라이브러리

1) src/main/webapp/WEB-INF/taglib/customTag.tld

<?xml version="1.0" encoding="UTF-8"?>
<taglib version="2.0" xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xml="http://www.w3.org/XML/1998/namespace"  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 ">
    
    <tlib-version>0.0</tlib-version>
    <short-name>customTag</short-name>
    <uri>http://customTag.com</uri>
    
    <tag>
        <name>kangspan</name>
        <tag-class>com.kangong.common.taglib.CustomTag</tag-class>
        <body-content>scriptless</body-content>
        <attribute>
            <name>color</name>
            <required>true</required>
            <rtexprvalue>true</rtexprvalue>
            <type>java.lang.String</type>
        </attribute>
        <attribute>
            <name>iterNum</name>
            <required>true</required>
            <rtexprvalue>true</rtexprvalue>
            <type>java.lang.Integer</type>
        </attribute>
    </tag>
</taglib>

2) CustomTag.java

package com.kangong.common.taglib;

import java.io.IOException;
import java.io.StringWriter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.SimpleTagSupport;
 
public class CustomTag extends SimpleTagSupport{
    
    private String color;
    private int iterNum;
    
    //doTag()를 오버라이딩 하여 커스텀 태그 처리 내용을 개발한다.
    @Override
    public void doTag() throws JspException, IOException {
        //JspContext는 이 태그를 사용한 JSP 페이지에 대한 정보를  담고 있다.  
        PageContext context = (PageContext)this.getJspContext();
        
        //태그가 호출된 JSP에 대해 요청 정보를 가져온다.
        HttpServletRequest request =  (HttpServletRequest)context.getRequest();
        System.out.println("태그가 호출된 JSP URI : " +  request.getRequestURI());
        
        
        //Jsp 페이지의 결과를 브라우저로 출력할 출력스트림를 얻는다.
        //JSP의 out 객체와 같음.
        JspWriter out = context.getOut();
        
        //커스텀 태그의 몸체를 담을 StringWriter
        StringWriter stringWriter = new StringWriter();
        
        //태그를 사용할때 지정한 속성값들
        String color = this.getColor();
        int iterNum = this.getIterNum();
        
        //invoke()가 실행되면 StringWriter의 몸체 텍스트가 담긴다.
        getJspBody().invoke(stringWriter);
        String bodyText = stringWriter.toString();
        
        out.print("<span style=\" background-color: "+ color + ";  \">");
        
        for(int i=0; i < iterNum; i++ ) {
            //out으로 내용 출력
            out.print("♥" + bodyText + "♥");
        }
        
        out.print("</span>");
    }
    
    public String getColor() {
        return color;
    }
    public void setColor(String color) {
        this.color = color;
    }
    public int getIterNum() {
        return iterNum;
    }
    public void setIterNum(int iterNum) {
        this.iterNum = iterNum;
    }
}

3) jsp

<%@ page language="java" contentType="text/html; charset=utf-8"  pageEncoding="utf-8"%>
<%@ include file="/views/include/include-header.jsp" %>
<%@ taglib prefix="kang" uri="/WEB-INF/taglib/customTag.tld" %>

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title>Main</title>

</head>
<body>
  Hello World!!   <br>
  
  <kang:kangspan color="yellow" iterNum="5">
       ktw
  </kang:kangspan>
  <br>
  

</body>
</html>

 

2. JSP 태그 라이브러리

1) src/main/webapp/WEB-INF/tags/tospan.tag

<%@ tag language="java" body-content="tagdependent"  pageEncoding="UTF-8"%>
<%@ attribute name="color" required="true" %>
<%@ attribute name="iterNum" required="true"  type="java.lang.Integer" %>

<%
    for(int i=0; i < iterNum; i++){
%>
    <span style="background-color: ${color}">
      ♥<jsp:doBody/>♥
    </span>
<%
    }
%>

2) JSP

<%@ page language="java" contentType="text/html; charset=utf-8"  pageEncoding="utf-8"%>
<%@ include file="/views/include/include-header.jsp" %>
<%@ taglib prefix="kang" uri="/WEB-INF/taglib/customTag.tld" %>
<%@ taglib prefix="kangong" tagdir="/WEB-INF/tags" %>

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title>Main</title>

</head>
<body>
  Hello World!!   <br>
  
  <kang:kangspan color="yellow" iterNum="5">
       ktw
  </kang:kangspan>
  <br>  
  
  <kangong:tospan color="blueviolet" iterNum="5">
      hello
  </kangong:tospan>
  
</body>
</html>

 

3. JSTL Function

1) src/main/webapp/WEB-INF/taglib/customFunction.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>Out Filter Custom Tag</description>
 <tlib-version>1.0</tlib-version>
 <short-name>kangfunc</short-name>
 <uri>/WEB-INF/tlds/customFunction.tld</uri>
 
 <function>
  <name>out</name>
  <function-class>com.kangong.common.taglib.CustomFunction</function-class>
  <function-signature>java.lang.String filter(java.lang.String)</function-signature>
 </function>
 
 <function>
        <description>문자열에 님 붙이기</description>
        <name>getTest</name>
        <function-class>com.kangong.common.taglib.CustomFunction</function-class>
        <function-signature>java.lang.String getTest(java.lang.String)</function-signature>
        <example>
         ${kangfunc:getTest(str)}
        </example>
    </function>

</taglib>

2) Java

package com.kangong.common.taglib;

public class CustomFunction {

	public static String filter(String str) {
	 // return str.replaceAll("\"", "\\\"").replaceAll("\r\n", "");
		return str+" ktw 만세!!";
	}
	
	public static String getTest(String txt){
        return txt + "님";
    }

}

3)JSP

<%@ page language="java" contentType="text/html; charset=utf-8"  pageEncoding="utf-8"%>
<%@ include file="/views/include/include-header.jsp" %>
<%@ taglib prefix="kang" uri="/WEB-INF/taglib/customTag.tld" %>
<%@ taglib prefix="kangong" tagdir="/WEB-INF/tags" %>
<%@ taglib prefix="kangfunc" uri="/WEB-INF/tlds/customFunction.tld" %>

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title>Main</title>

</head>
<body>
  Hello World!!   <br>
  
  <kang:kangspan color="yellow" iterNum="5">
       ktw
  </kang:kangspan>
  <br>  
  
  <kangong:tospan color="blueviolet" iterNum="5">
      hello
  </kangong:tospan>
  
  ${kangfunc:out("abc")}; <br> 
  <br>
  ${kangfunc:getTest("ktw")}
  
</body>
</html>

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