java enum 结合jstl自定义标签做展示

Java Enum 学习篇：
http://blog.csdn.net/abing37/archive/2009/07/29/4391222.aspx

 

    以前做项目都是使用final Static定义状态,这样做也能满足要求，当状态码发生改变的时候只需改一处地方，刚才听同事说可以使用enum来定义常量，更加优雅，所以决定学习下。上面这篇博客介绍了enum的入门和原理，我将把同事做的jstl自定义标签展示出来，积累下知识

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  1.定义enum-HvProcStateEnum

 

public enum HvProcStateEnum {TOCHECK("90","待复核"),TOUPDATE("93","待修改"),TOGRANT("92","待授权"),TOSEND("03","待发送"),SENDED("04","已发送"),APIOK("05","API成功"),APIFAIL("06","AIP拒绝"); //.................其他暂略private String code;private String descript;private HvProcStateEnum(String code,String descript){this.code = code;this.descript = descript;}public String getCode() {return code;}public void setCode(String code) {this.code = code;}public String getDescript() {return descript;}public void setDescript(String descript) {this.descript = descript;}} 

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2.state.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"> <tlib-version>1.1</tlib-version> <short-name>state</short-name> <uri>/test.state</uri> <function><description>大额往账汇兑业务中文处理状态</description><name>hvsendproc</name><function-class>com.test.util.StateUtil</function-class><function-signature> java.lang.String getHvCnProc(java.lang.String) </function-signature> <example>${state:getHvCnProc(value)}</example></function></taglib>  

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3.处理类StateUtil

public class StateUtil {/* * 返回大额往账汇兑业务处理状态中文描述 */public static String getHvCnProc(String code){String retValue = "未知";if(code != null){code = code.trim();if("".equals(code)){return retValue;}}else{return retValue;}for(HvProcStateEnum en: HvProcStateEnum.values()){if(en.getCode().equals(code)){retValue = en.getDescript();break;}}return retValue;}}

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4.在web.xml注册tld

<jsp-config> <taglib> <taglib-uri>/test.state</taglib-uri><taglib-location>/WEB-INF/tld/state.tld</taglib-location></taglib></jsp-config>  

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5.使用jstl自定义标签

jsp里加入

<%@ taglib prefix="state" uri="/test.state" %>
然后
${state:hvsendproc(hvSndExchglist.procstate)}