jsonAdnPojo

 @SuppressWarnings("unchecked")  
    public static String toJSONString(Object value) {  
        if (value == null) return "null";    
        if (value instanceof Number) return value.toString();  
        if (value instanceof Boolean) return value.toString();            
        if (value instanceof String)  
            return "\"" + escape((String) value) + "\"";            
        if (value instanceof Double) {  
            if (((Double) value).isInfinite() || ((Double) value).isNaN())  
                return "null";  
            else  
                return value.toString();  
        }    
        if (value instanceof Float) {  
            if (((Float) value).isInfinite() || ((Float) value).isNaN())  
                return "null";  
            else  
                return value.toString();  
        }                            
        if (value instanceof Map) return map2Json((Map) value);            
        if (value instanceof Collection) return coll2Json((Collection) value);            
        if (value.getClass().isArray()) return array2Json(value);            
        return pojo2Json(value);  
    }  

    static String array2Json(Object array) {  
        if (null == array) return "null" ;  
        StringBuffer sb = new StringBuffer();  
        sb.append('[');            
        // 此处减1是为了下面的 逗号 追加  
        int len = Array.getLength(array) - 1;  
        if (len > -1){  
            int i ;  
            for (i = 0; i < len; i++) {  
                sb.append(toJSONString(Array.get(array, i))).append(", ");  
            }  
            sb.append(toJSONString(Array.get(array, i)));  
        }            
        sb.append(']');  
        return sb.toString();  
    }  
    static String coll2Json(Collection coll) {  
        if (null == coll) return "null" ;  
        StringBuffer sb = new StringBuffer();  
        sb.append('[');  
        for (Iterator it = coll.iterator(); it.hasNext();) {  
            sb.append(toJSONString(it.next()));  
            if (it.hasNext())  
                sb.append(", ");  
        }  
        sb.append(']');  
        return sb.toString();  
    };