纯绿色 jsonUtil工具

package com.daditech.common.util;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.Date;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang.StringUtils;


/**
* 
* 项目名称：drp  <br/>  
* 类名称：JsonUtil <br/>   
* 类描述：     <br/>
* 创建人：ki_tom   <br/>
* 创建时间：2013-8-12 下午2:11:24 <br/> 
* 修改人：ao.ouyang   <br/>
* 修改时间：2014年10月1日11:25:24  <br/>    
* @version 1.2    
*
 */
public class JsonUtil {
	public static final String SEP1 = ":";
	public static final String SEP11 = "=";
	public static final String SEP2 = ",";
	public static boolean isRemoveZeroList;
    public static String TimestampPattern = "yyyy-MM-dd HH:mm:ss";
    public static String DatePattern = "yyyy-MM-dd HH:mm:ss";
    public static boolean isCamelSpelling = true;

	/**
	 * 
	* @Function string转化为map<String,String> <br/>
	* @param mapStr  <br/>
	* @require <br/>
	* @return Map<String,String> <br/>
	* @Exception <br/>
	* @since  　version 1.0    <br/>
	* 创建人：ki_tom  <br/>
	* 创建时间：2013-8-12 下午2:11:39  <br/>
	* 修改人：ao.ouyang   <br/>
	* 修改时间：2014年10月1日11:27:00   <br/>
	 */
    
	public static Map<String,String> strToMap(String mapStr) {

		if (StringUtils.isEmpty(mapStr)) {
			return null;
		}
		mapStr = mapStr.substring(1,mapStr.length()-1).replaceAll("'", "").replace("\"", "");
		Map<String,String> map = new HashMap<String,String>();
		// 转换为数组
		String[] text = mapStr.split("\\" + SEP2); 
		for (String str : text) {
			 // 转换key与value的数组
			String[] keyText = str.split(str.indexOf(SEP1)!=-1?SEP1:SEP11);
			if (keyText.length <= 1) {
				continue;
			}
			String key = keyText[0]; // key
			String value = keyText[1]; // value
				map.put(key.trim(), value.trim());
		}
		return map;
	}
	

	public static String toJson(Object obj)
    {
		if(null!=obj){
			if(obj instanceof List){
	    		return toJson((List)obj);
	    	}else if(obj instanceof Object[]){
	    		return toJson((Object[])obj);
	    	}else{
	    		toJson(getAttributes(obj)); 
	    	}
		}
		return null;
    }

    public static String toJson(Map map)
    {
        String result = "";
        map = removeListAttr(map);
        for(Iterator it = map.keySet().iterator(); it.hasNext();)
        {
            String name = (String)it.next();
            Object value = map.get(name);
            if(value == null)
                result = (new StringBuilder()).append(result).append("\"").append(name).append("\":null,").toString();
            else
            if(value instanceof Boolean)
            {
                Boolean b = (Boolean)value;
                result = (new StringBuilder()).append(result).append("\"").append(name).append("\":").append(b.toString()).append(",").toString();
            } else
            if((value instanceof Integer) || (value instanceof Long) || (value instanceof Float) || (value instanceof Double) || (value instanceof Short) || (value instanceof BigInteger) || (value instanceof BigDecimal))
                result = (new StringBuilder()).append(result).append("\"").append(name).append("\":").append(value.toString()).append(",").toString();
            else
            if(value instanceof String)
            {
                String v = (String)value;
                v = v.replaceAll("\\\\", "\\\\\\\\");
                v = v.replaceAll("\n", "\\\\n");
                v = v.replaceAll("\r", "\\\\r");
                v = v.replaceAll("\"", "\\\\\"");
                v = v.replaceAll("'", "\\\\'");
                result = (new StringBuilder()).append(result).append("\"").append(name).append("\":").append("\"").append(v).append("\",").toString();
            } else
            if(value instanceof Date || value instanceof java.util.Date)
            {
                SimpleDateFormat df = new SimpleDateFormat(DatePattern);
                String s = df.format(value);
                result = (new StringBuilder()).append(result).append("\"").append(name).append("\":").append("\"").append(s).append("\",").toString();
            } else
            if(value instanceof Timestamp)
            {
                
				SimpleDateFormat df = new SimpleDateFormat(TimestampPattern);
                Timestamp v = (Timestamp)value;
                String s = df.format(new java.util.Date(v.getTime()));
                result = (new StringBuilder()).append(result).append("\"").append(name).append("\":").append("\"").append(s).append("\",").toString();
            } else
            if(value instanceof List)
            {
                String v = toJson((List)value);
                result = (new StringBuilder()).append(result).append("\"").append(name).append("\":").append(v).append(",").toString();
            } else
            if(value instanceof Map)
            {
                Map attr = removeListAttr((Map)value);
                result = (new StringBuilder()).append(result).append("\"").append(name).append("\":").append(toJson(attr)).append(",").toString();
            } else
            if(!value.getClass().getName().startsWith("java"))
            {
                Map attr = getAttributes(value);
                attr = removeListAttr(attr);
                result = (new StringBuilder()).append(result).append("\"").append(name).append("\":").append(toJson(attr)).append(",").toString();
            } else
            {
                result = (new StringBuilder()).append(result).append("\"").append(name).append("\":").append("\"").append(value.toString()).append("\",").toString();
            }
        }

        if(result.length() == 0)
            return "{}";
        else
            return (new StringBuilder()).append("{").append(result.substring(0, result.length() - 1)).append("}").toString();
    }

    public static String toJson(Object aa[])
    {
        if(aa.length == 0)
            return "[]";
        String result = "";
        Object arr$[] = aa;
        int len$ = arr$.length;
        for(int i$ = 0; i$ < len$; i$++)
        {
            Object obj = arr$[i$];
            if(obj==null){
            	result = (new StringBuilder()).append(result).append("null").append(",").toString();
            	continue;
            }
            else if(obj instanceof Map)
            {
                Map map = (Map)obj;
                map = removeListAttr(map);
                result = (new StringBuilder()).append(result).append(toJson(map)).append(",").toString();
                continue;
            }
            else if(obj instanceof List)
            {
            	List arr = (List)obj;
                result = (new StringBuilder()).append(result).append(toJson(arr)).append(",").toString();
                continue;
            }
            else if (obj instanceof Object[]) {
            	Object[] arr = (Object[])obj;
            	result = (new StringBuilder()).append(result).append(toJson(arr)).append(",").toString();
                continue;
			}
            else  if(obj instanceof String)
            {
                result = (new StringBuilder()).append(result).append("\"").append(String.valueOf(obj)).append("\",").toString();
                continue;
            }
            
            else {
                Map attr = getAttributes(obj);
                	attr = removeListAttr(attr);
                result = (new StringBuilder()).append(result).append(toJson(attr)).append(",").toString();
                
             }
        }

        return (new StringBuilder()).append("[").append(result.substring(0, result.length() - 1)).append("]").toString();
    }

    public static String toJson(List ll)
    {	
    	
        return ll==null? "[]":toJson(ll.toArray());
    }

    public static Map getAttributes(Object obj)
    {	
        Class c = obj.getClass();
        try
        {
            Method method = c.getMethod("isProxy", new Class[0]);
            Boolean result = (Boolean)method.invoke(obj, new Object[0]);
            if(result.booleanValue())
                c = c.getSuperclass();
        }
        catch(Exception e) { }
        Map attr = new HashMap();
        Field arr$[] = c.getFields();
        int len$ = arr$.length;
        for(int i$ = 0; i$ < len$; i$++)
        {
            Field f = arr$[i$];
            try
            {
                Object value = f.get(obj);
                attr.put(f.getName(), value);
            }
            catch(Exception e) { }
        }

       Method [] arr$2 = c.getDeclaredMethods();
        len$ = arr$2.length;
        for(int i$ = 0; i$ < len$; i$++)
        {
            Method m = arr$2[i$];
            String mname = m.getName();
            if(mname.equals("getClass"))
                continue;
            String pname;
            if(mname.startsWith("get"))
            {
                pname = mname.substring(3);
                if(pname.length() == 1)
                    pname = isCamelSpelling?
                    		pname.toLowerCase()
                    		:pname;
                else
                    pname = isCamelSpelling?
                    		(new StringBuilder())
		                    .append(pname.substring(0, 1).toLowerCase())
		                    .append(pname.substring(1))
		                    .toString()
		                    :pname;
                try
                {
                    Object value = m.invoke(obj, new Object[0]);
                    attr.put(pname, value);
                }
                catch(Exception e) { }
                continue;
            }
            if(!mname.startsWith("is"))
                continue;
            pname = mname.substring(2);
            if(pname.length() == 1)
                pname = pname.toLowerCase();
            else
                pname = (new StringBuilder()).append(pname.substring(0, 1).toLowerCase()).append(pname.substring(1)).toString();
            try
            {
                Object value = m.invoke(obj, new Object[0]);
                attr.put(pname, value);
            }
            catch(Exception e) { }
        }

        return attr;
    }

    private static Map removeListAttr(Map map)
    {
        Map newMap = new HashMap();
        Iterator i$ = map.entrySet().iterator();
        do
        {
            if(!i$.hasNext())
                break;
            Object enObj = i$.next();
            java.util.Map.Entry en = (java.util.Map.Entry)enObj;
            if(isRemoveZeroList&&en.getValue() instanceof List &&((List)en.getValue()).size()==0)
            	continue;
            else
            	newMap.put((String)en.getKey(), en.getValue());
            
            
        } while(true);
        return newMap;
    }
}