纯绿色 jsonUtil工具

  1. package com.daditech.common.util;
  2. import java.lang.reflect.Field;
  3. import java.lang.reflect.Method;
  4. import java.math.BigDecimal;
  5. import java.math.BigInteger;
  6. import java.sql.Date;
  7. import java.sql.Timestamp;
  8. import java.text.SimpleDateFormat;
  9. import java.util.HashMap;
  10. import java.util.Iterator;
  11. import java.util.List;
  12. import java.util.Map;
  14. import org.apache.commons.lang.StringUtils;
  17. /**
  18. * 
  19. * 项目名称：drp  <br/>  
  20. * 类名称：JsonUtil <br/>   
  21. * 类描述：     <br/>
  22. * 创建人：ki_tom   <br/>
  23. * 创建时间：2013-8-12 下午2:11:24 <br/> 
  24. * 修改人：ao.ouyang   <br/>
  25. * 修改时间：2014年10月1日11:25:24  <br/>    
  26. * @version 1.2    
  27. *
  28.  */
  29. public class JsonUtil {
  30. 	public static final String SEP1 = ":";
  31. 	public static final String SEP11 = "=";
  32. 	public static final String SEP2 = ",";
  33. 	public static boolean isRemoveZeroList;
  34.     public static String TimestampPattern = "yyyy-MM-dd HH:mm:ss";
  35.     public static String DatePattern = "yyyy-MM-dd HH:mm:ss";
  36.     public static boolean isCamelSpelling = true;
  38. 	/**
  39. 	 * 
  40. 	* @Function string转化为map<String,String> <br/>
  41. 	* @param mapStr  <br/>
  42. 	* @require <br/>
  43. 	* @return Map<String,String> <br/>
  44. 	* @Exception <br/>
  45. 	* @since  　version 1.0    <br/>
  46. 	* 创建人：ki_tom  <br/>
  47. 	* 创建时间：2013-8-12 下午2:11:39  <br/>
  48. 	* 修改人：ao.ouyang   <br/>
  49. 	* 修改时间：2014年10月1日11:27:00   <br/>
  50. 	 */
  51.     
  52. 	public static Map<String,String> strToMap(String mapStr) {
  54. 		if (StringUtils.isEmpty(mapStr)) {
  55. 			return null;
  56. 		}
  57. 		mapStr = mapStr.substring(1,mapStr.length()-1).replaceAll("'", "").replace(""", "");
  58. 		Map<String,String> map = new HashMap<String,String>();
  59. 		// 转换为数组
  60. 		String[] text = mapStr.split("\" + SEP2); 
  61. 		for (String str : text) {
  62. 			 // 转换key与value的数组
  63. 			String[] keyText = str.split(str.indexOf(SEP1)!=-1?SEP1:SEP11);
  64. 			if (keyText.length <= 1) {
  65. 				continue;
  66. 			}
  67. 			String key = keyText[0]; // key
  68. 			String value = keyText[1]; // value
  69. 				map.put(key.trim(), value.trim());
  70. 		}
  71. 		return map;
  72. 	}
  73. 	
  75. 	public static String toJson(Object obj)
  76.     {
  77. 		if(null!=obj){
  78. 			if(obj instanceof List){
  79. 	    		return toJson((List)obj);
  80. 	    	}else if(obj instanceof Object[]){
  81. 	    		return toJson((Object[])obj);
  82. 	    	}else{
  83. 	    		toJson(getAttributes(obj)); 
  84. 	    	}
  85. 		}
  86. 		return null;
  87.     }
  89.     public static String toJson(Map map)
  90.     {
  91.         String result = "";
  92.         map = removeListAttr(map);
  93.         for(Iterator it = map.keySet().iterator(); it.hasNext();)
  94.         {
  95.             String name = (String)it.next();
  96.             Object value = map.get(name);
  97.             if(value == null)
  98.                 result = (new StringBuilder()).append(result).append(""").append(name).append("":null,").toString();
  99.             else
  100.             if(value instanceof Boolean)
  101.             {
  102.                 Boolean b = (Boolean)value;
  103.                 result = (new StringBuilder()).append(result).append(""").append(name).append("":").append(b.toString()).append(",").toString();
  104.             } else
  105.             if((value instanceof Integer) || (value instanceof Long) || (value instanceof Float) || (value instanceof Double) || (value instanceof Short) || (value instanceof BigInteger) || (value instanceof BigDecimal))
  106.                 result = (new StringBuilder()).append(result).append(""").append(name).append("":").append(value.toString()).append(",").toString();
  107.             else
  108.             if(value instanceof String)
  109.             {
  110.                 String v = (String)value;
  111.                 v = v.replaceAll("\\", "\\\\");
  112.                 v = v.replaceAll("
", "\\n");
  113.                 v = v.replaceAll("
", "\\r");
  114.                 v = v.replaceAll(""", "\\"");
  115.                 v = v.replaceAll("'", "\\'");
  116.                 result = (new StringBuilder()).append(result).append(""").append(name).append("":").append(""").append(v).append("",").toString();
  117.             } else
  118.             if(value instanceof Date || value instanceof java.util.Date)
  119.             {
  120.                 SimpleDateFormat df = new SimpleDateFormat(DatePattern);
  121.                 String s = df.format(value);
  122.                 result = (new StringBuilder()).append(result).append(""").append(name).append("":").append(""").append(s).append("",").toString();
  123.             } else
  124.             if(value instanceof Timestamp)
  125.             {
  126.                 
  127. 				SimpleDateFormat df = new SimpleDateFormat(TimestampPattern);
  128.                 Timestamp v = (Timestamp)value;
  129.                 String s = df.format(new java.util.Date(v.getTime()));
  130.                 result = (new StringBuilder()).append(result).append(""").append(name).append("":").append(""").append(s).append("",").toString();
  131.             } else
  132.             if(value instanceof List)
  133.             {
  134.                 String v = toJson((List)value);
  135.                 result = (new StringBuilder()).append(result).append(""").append(name).append("":").append(v).append(",").toString();
  136.             } else
  137.             if(value instanceof Map)
  138.             {
  139.                 Map attr = removeListAttr((Map)value);
  140.                 result = (new StringBuilder()).append(result).append(""").append(name).append("":").append(toJson(attr)).append(",").toString();
  141.             } else
  142.             if(!value.getClass().getName().startsWith("java"))
  143.             {
  144.                 Map attr = getAttributes(value);
  145.                 attr = removeListAttr(attr);
  146.                 result = (new StringBuilder()).append(result).append(""").append(name).append("":").append(toJson(attr)).append(",").toString();
  147.             } else
  148.             {
  149.                 result = (new StringBuilder()).append(result).append(""").append(name).append("":").append(""").append(value.toString()).append("",").toString();
  150.             }
  151.         }
  153.         if(result.length() == 0)
  154.             return "{}";
  155.         else
  156.             return (new StringBuilder()).append("{").append(result.substring(0, result.length() - 1)).append("}").toString();
  157.     }
  159.     public static String toJson(Object aa[])
  160.     {
  161.         if(aa.length == 0)
  162.             return "[]";
  163.         String result = "";
  164.         Object arr$[] = aa;
  165.         int len$ = arr$.length;
  166.         for(int i$ = 0; i$ < len$; i$++)
  167.         {
  168.             Object obj = arr$[i$];
  169.             if(obj==null){
  170.             	result = (new StringBuilder()).append(result).append("null").append(",").toString();
  171.             	continue;
  172.             }
  173.             else if(obj instanceof Map)
  174.             {
  175.                 Map map = (Map)obj;
  176.                 map = removeListAttr(map);
  177.                 result = (new StringBuilder()).append(result).append(toJson(map)).append(",").toString();
  178.                 continue;
  179.             }
  180.             else if(obj instanceof List)
  181.             {
  182.             	List arr = (List)obj;
  183.                 result = (new StringBuilder()).append(result).append(toJson(arr)).append(",").toString();
  184.                 continue;
  185.             }
  186.             else if (obj instanceof Object[]) {
  187.             	Object[] arr = (Object[])obj;
  188.             	result = (new StringBuilder()).append(result).append(toJson(arr)).append(",").toString();
  189.                 continue;
  190. 			}
  191.             else  if(obj instanceof String)
  192.             {
  193.                 result = (new StringBuilder()).append(result).append(""").append(String.valueOf(obj)).append("",").toString();
  194.                 continue;
  195.             }
  196.             
  197.             else {
  198.                 Map attr = getAttributes(obj);
  199.                 	attr = removeListAttr(attr);
  200.                 result = (new StringBuilder()).append(result).append(toJson(attr)).append(",").toString();
  201.                 
  202.              }
  203.         }
  205.         return (new StringBuilder()).append("[").append(result.substring(0, result.length() - 1)).append("]").toString();
  206.     }
  208.     public static String toJson(List ll)
  209.     {	
  210.     	
  211.         return ll==null? "[]":toJson(ll.toArray());
  212.     }
  214.     public static Map getAttributes(Object obj)
  215.     {	
  216.         Class c = obj.getClass();
  217.         try
  218.         {
  219.             Method method = c.getMethod("isProxy", new Class[0]);
  220.             Boolean result = (Boolean)method.invoke(obj, new Object[0]);
  221.             if(result.booleanValue())
  222.                 c = c.getSuperclass();
  223.         }
  224.         catch(Exception e) { }
  225.         Map attr = new HashMap();
  226.         Field arr$[] = c.getFields();
  227.         int len$ = arr$.length;
  228.         for(int i$ = 0; i$ < len$; i$++)
  229.         {
  230.             Field f = arr$[i$];
  231.             try
  232.             {
  233.                 Object value = f.get(obj);
  234.                 attr.put(f.getName(), value);
  235.             }
  236.             catch(Exception e) { }
  237.         }
  239.        Method [] arr$2 = c.getDeclaredMethods();
  240.         len$ = arr$2.length;
  241.         for(int i$ = 0; i$ < len$; i$++)
  242.         {
  243.             Method m = arr$2[i$];
  244.             String mname = m.getName();
  245.             if(mname.equals("getClass"))
  246.                 continue;
  247.             String pname;
  248.             if(mname.startsWith("get"))
  249.             {
  250.                 pname = mname.substring(3);
  251.                 if(pname.length() == 1)
  252.                     pname = isCamelSpelling?
  253.                     		pname.toLowerCase()
  254.                     		:pname;
  255.                 else
  256.                     pname = isCamelSpelling?
  257.                     		(new StringBuilder())
  258. 		                    .append(pname.substring(0, 1).toLowerCase())
  259. 		                    .append(pname.substring(1))
  260. 		                    .toString()
  261. 		                    :pname;
  262.                 try
  263.                 {
  264.                     Object value = m.invoke(obj, new Object[0]);
  265.                     attr.put(pname, value);
  266.                 }
  267.                 catch(Exception e) { }
  268.                 continue;
  269.             }
  270.             if(!mname.startsWith("is"))
  271.                 continue;
  272.             pname = mname.substring(2);
  273.             if(pname.length() == 1)
  274.                 pname = pname.toLowerCase();
  275.             else
  276.                 pname = (new StringBuilder()).append(pname.substring(0, 1).toLowerCase()).append(pname.substring(1)).toString();
  277.             try
  278.             {
  279.                 Object value = m.invoke(obj, new Object[0]);
  280.                 attr.put(pname, value);
  281.             }
  282.             catch(Exception e) { }
  283.         }
  285.         return attr;
  286.     }
  288.     private static Map removeListAttr(Map map)
  289.     {
  290.         Map newMap = new HashMap();
  291.         Iterator i$ = map.entrySet().iterator();
  292.         do
  293.         {
  294.             if(!i$.hasNext())
  295.                 break;
  296.             Object enObj = i$.next();
  297.             java.util.Map.Entry en = (java.util.Map.Entry)enObj;
  298.             if(isRemoveZeroList&&en.getValue() instanceof List &&((List)en.getValue()).size()==0)
  299.             	continue;
  300.             else
  301.             	newMap.put((String)en.getKey(), en.getValue());
  302.             
  303.             
  304.         } while(true);
  305.         return newMap;
  306.     }
  307. }

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原文地址：https://www.cnblogs.com/signheart/p/6595577.html