el 表达式得到cookie的value值

自定义一个工具类,实现需要的功能

package com.lanxin.bean;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
public class cookie {
    public static String urlDecode(String value){
        try {
            value= URLDecoder.decode(value, "UTF-8");   
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return value;
    }
}

创建一个对应的标签文件tld文件,放在WEB-INF下

<?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">
​
    <tlib-version>1.0</tlib-version>
    <short-name>el</short-name>
    <uri>http://com.lanxin.bean/cookie</uri>
    <function>
        <name>urlDecode</name>
        <function-class>com.lanxin.bean.cookie</function-class>
        <function-signature>java.lang.String urlDecode(java.lang.String)</function-signature>
    </function>
</taglib>
​

在web.xml中配置该TDL的导入路径

 <jsp-config>
    <taglib>
        <taglib-uri>http://com.lanxin.bean/cookie</taglib-uri>
        <taglib-location>/WEB-INF/cookie.tld</taglib-location>
    </taglib>
  </jsp-config>

在jsp页面引用

<%@ taglib uri="http://com.lanxin.bean/cookie" prefix="el" %>
    
    value="${el:urlDecode(cookie.user.value)}

标签：el,java,String,urlDecode,value,cookie
来源： https://blog.csdn.net/Hxp_0611/article/details/117121239