JSP custom tld method tag

shit

We can customize a method tag for use in the page through the tld file. The directory is usually placed in the tlds folder under WEB-INF:

An example of the import method, directly import the tld tag file on the jsp:

<%@ taglib prefix="fns" uri="/WEB-INF/tlds/fns.tld" %>

Writing in fns.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>JSTL 1.1 functions library</description>
  <display-name>JSTL functions sys</display-name>
  <tlib-version>1.1</tlib-version>
  <short-name>fns</short-name>
  <uri>http://java.sun.com/jsp/jstl/functionss</uri>

<!-- DictUtils -->
  <function>
    <description>获取字典标签</description>
    <name>getDictLabel</name>
    <function-class>com.jeeplus.modules.sys.utils.DictUtils</function-class>
    <function-signature>java.lang.String getDictLabel(java.lang.String, java.lang.String, java.lang.String)</function-signature>
    <example>${fns:getDictLabel(value, type,defaultValue)}</example>  
  </function>
  
  <function>
    <description>获取字典标签(多个)</description>
    <name>getDictLabels</name>
    <function-class>com.jeeplus.modules.sys.utils.DictUtils</function-class>
    <function-signature>java.lang.String getDictLabels(java.lang.String, java.lang.String, java.lang.String)</function-signature>
    <example>${fns:getDictLabels(values, type, defaultValue)}</example>  
  </function>

  <function>
    <description>获取字典值</description>
    <name>getDictValue</name>
    <function-class>com.jeeplus.modules.sys.utils.DictUtils</function-class>
    <function-signature>java.lang.String getDictValue(java.lang.String, java.lang.String, java.lang.String)</function-signature>
    <example>${fns:getDictValue(label, type, defaultValue)}</example>  
  </function>

Note: 
function-class is the class path where the entity of the method is located, 

function-signature is the method name of the method, and this method must be a static method.

example is an example of how to use it

Backstage:

public static String getDictLabel(String value, String type, String defaultValue){
        if (StringUtils.isNotBlank(type) && StringUtils.isNotBlank(value)){
            for (Dict dict : getDictList(type)){
                if (type.equals(dict.getType()) && value.equals(dict.getValue())){
                    return dict.getLabel();
                }
            }
        }
        return defaultValue;
    }
    
    public static String getDictLabels(String values, String type, String defaultValue){
        if (StringUtils.isNotBlank(type) && StringUtils.isNotBlank(values)){
            List<String> valueList = Lists.newArrayList();
            for (String value : StringUtils.split(values, ",")){
                valueList.add(getDictLabel(value, type, defaultValue));
            }
            return StringUtils.join(valueList, ",");
        }
        return defaultValue;
    }

    public static String getDictValue(String label, String type, String defaultLabel){
        if (StringUtils.isNotBlank(type) && StringUtils.isNotBlank(label)){
            for (Dict dict : getDictList(type)){
                if (type.equals(dict.getType()) && label.equals(dict.getLabel())){
                    return dict.getValue();
                }
            }
        }
        return defaultLabel;
    }

JSP pages use:

　　<td>
       ${fns:getDictLabel(preparationManage.preparationMode, 'samplingMode', '')}             
   </td>

JSP custom tld method tag

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