java jstl 自定义标签

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"%>

 <td><payStatus:payStatus name="1"  type="json"  jsonName="portalpayStatus"/></td>

 

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