java jstl 自定义标签

矫情吗；* 2022-07-12 04:55 200阅读 0赞

package com.xilehang.common.util;
    
    import java.io.File;
    import java.io.IOException;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.Scanner;
    import javax.servlet.jsp.JspException;
    import javax.servlet.jsp.JspTagException;
    import javax.servlet.jsp.JspWriter;
    import javax.servlet.jsp.tagext.TagSupport;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import net.sf.json.JSONObject;
    
    /**
     * 自定义数字字典转换，支持json和map两种
     * @author ctl
     *
     */
    public class StatusTag extends TagSupport {
    	static Logger logger = LoggerFactory.getLogger(StatusTag.class);  
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = 1L;
    
    
    	protected String name;
    
    	private static HashMap<String, Map<String, Object>> hashMap;
    
    	protected String type;
    	
    	private String jsonName;
    	
    	private String mapName;
    	
    	public String getMapName() {
    		return mapName;
    	}
    
    	public void setMapName(String mapName) {
    		this.mapName = mapName;
    	}
    
    	public String getJsonName() {
    		return jsonName;
    	}
    
    	public void setJsonName(String jsonName) {
    		this.jsonName = jsonName;
    	}
        static{
        	hashMap=new HashMap<String,Map<String,Object>>();
        	Map<String,Object> portalPayStatus=new HashMap<String, Object>();
        	portalPayStatus.put("0", "已经接受");
        	portalPayStatus.put("1", "处理中");
        	portalPayStatus.put("2", "支付成功");
        	portalPayStatus.put("3", "支付失败");
        	hashMap.put("portalPayStatus", portalPayStatus);
        }
    	@SuppressWarnings("unchecked")
    	public int doEndTag() throws JspException {
    
    		JspWriter out=null;
    		try {
    			out = pageContext.getOut();
    			if("json".equals(type)){//如果类型为json 对应的js文件存放zai/conf/json下面
    				if(hashMap.get(jsonName)==null||"".equals(hashMap.get(jsonName))){//如果是第二次调用json文件则从map中取值，避免多次读取文件
    					Scanner scanner = new Scanner(StatusTag.class.getClassLoader().getResourceAsStream("json" + File.separator + jsonName + ".js"),"utf-8");
    					StringBuilder buf = new StringBuilder();
    
    					while (scanner.hasNext()) {
    						String str = scanner.nextLine();
    						if (str != null) {
    							buf.append(str.trim());
    						}
    					}
    					scanner.close();
    					Map<String, Object> jsonMap = JSONObject.fromObject(buf.toString());
    					hashMap.put(jsonName, jsonMap);//将数据放到map中,防止多次执行调用读取js文件
    					String value=jsonMap.get(name).toString();
    					if(value==null){
    						out.print(name);
    					}else{
    						out.print(value);
    					}
    				}else{
    					String value=(String) hashMap.get(jsonName).get(name);
    					if(value==null){
    						out.print(name);
    					}else{
    						out.print(value);
    					}
    				}
    				
    			}else if("map".equals(type)){
    				out.print(hashMap.get(mapName).get(name));
    			}
    			
    
    		} catch (Exception e) {
    			try {
    				out.print(name);
    			} catch (IOException e1) {
    			}
    			logger.error("自定义标签转换异常",e);
    		}
    
    		return super.doEndTag();
    	}
    
    	public int doStartTag() throws JspTagException {
    
    		return EVAL_BODY_INCLUDE;
    
    	}
    
    	public HashMap<String, Map<String, Object>> getHashMap() {
    		return hashMap;
    	}
    
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		if(name!=null){
    			this.name = name.trim();
    		}else{
    			this.name="";
    		}
    	}
    
    	public String getType() {
    		return type;
    	}
    
    	public void setType(String type) {
    		this.type = type;
    	}
    }

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN" "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">
    <taglib>
    	<tlibversion>1.0</tlibversion>
    	<jspversion>1.1</jspversion>
    	<shortname>StatusTag</shortname>
    	<tag>
    		<name>payStatus</name>
    		<tagclass>com.xilehang.common.util.StatusTag</tagclass>
    		<attribute>
    			<name>name</name>
    			<required>true</required>
    			<rtexprvalue>true</rtexprvalue>
    		</attribute>
    		<attribute>
    			<name>mapName</name>
    			<required>false</required>
    			<rtexprvalue>true</rtexprvalue>
    		</attribute>
    		<attribute>
    			<name>type</name>
    			<required>false</required>
    			<rtexprvalue>true</rtexprvalue>
    		</attribute>
    		<attribute>
    			<name>jsonName</name>
    			<required>false</required>
    			<rtexprvalue>true</rtexprvalue>
    		</attribute>
    	</tag>
    </taglib>

<%@ taglib uri="/WEB-INF/tld/statusTran.tld" prefix="payStatus"%>

portalpayStatus.js  内容为
    {'0':'已经接受','1':'处理中','2':'支付成功','3':'支付失败'}