package com.yunmall.warehouse.core.util;import java.lang.reflect.Array;import java.lang.reflect.Field;import java.lang.reflect.Method;import java.text.SimpleDateFormat;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Map.Entry;import java.util.Set;/** * json 解析与生成工具类 * @author zhanglong * @version Warehouse 1.0 * @since Warehouse 1.0 2012-12-4 * @see 上午9:58:39 */public class JsonUtils { /** * 格式化日期 */ private static final SimpleDateFormat FMT = new SimpleDateFormat( "yyyy-MM-dd"); private Map<String, Object> jsonMap = new HashMap<String, Object>(); /** * 清理map * @author zhanglong */ public void clear() { jsonMap.clear(); } /** * 添加元素 <br/> * @author zhanglong * @param key 键 * @param value 值 * @return Map */ public Map<String, Object> put(String key, Object value) { jsonMap.put(key, value); return jsonMap; } /** * 判断是否要加引号 * return (value instanceof Integer || value instanceof Boolean * || value instanceof Double || value instanceof Float * || value instanceof Short || value instanceof Long || value * instanceof Byte); * @author zhanglong * @param value * @return boolean */ private static boolean isNoQuote(Object value) { if (value instanceof Integer) { return true; } else if (value instanceof Boolean) { return true; } else if (value instanceof Double) { return true; } else if (value instanceof Float) { return true; } else if (value instanceof Short) { return true; } else if (value instanceof Long) { return true; } else if (value instanceof Byte) { return true; } else { return false; } } /** * 判断是否要加引号 * @author zhanglong * @param value * @return boolean */ private static boolean isQuote(Object value) { if (value instanceof String) { return true; } else if (value instanceof Character) { return true; } else { return false; } } /** * 返回形如{'apple':'red','lemon':'yellow'}的字符串 * @author zhanglong * @return String * @see java.lang.Object#toString() */ @SuppressWarnings("unchecked") @Override public String toString() { StringBuffer sb = new StringBuffer(); sb.append("{"); Set<Entry<String, Object>> set = jsonMap.entrySet(); for (Entry<String, Object> entry : set) { Object value = entry.getValue(); if (value == null) { continue;// 对于null值，不进行处理，页面上的js取不到值时也是null } sb.append("'").append(entry.getKey()).append("':"); if (value instanceof JsonUtils) { sb.append(value.toString()); } else if (isNoQuote(value)) { sb.append(value); } else if (value instanceof Date) { sb.append("'").append(FMT.format(value)).append("'"); } else if (isQuote(value)) { sb.append("'").append(value).append("'"); } else if (value.getClass().isArray()) { sb.append(arrayToStr(value)); } else if (value instanceof Map) { sb.append(fromObject((Map<String, Object>) value).toString()); } else if (value instanceof List) { sb.append(listToStr((List<Object>) value)); } else { sb.append(fromObject(value).toString()); } sb.append(","); } int len = sb.length(); if (len > 1) { sb.delete(len - 1, len); } sb.append("}"); return sb.toString(); } /** * 数组拼接 * @author zhanglong * @param array 数组 * @return String */ public static String arrayToStr(Object array) { if (!array.getClass().isArray()) { return "[]"; } StringBuffer sb = new StringBuffer(); sb.append("["); int len = Array.getLength(array); Object v = null; for (int i = 0; i < len; i++) { v = Array.get(array, i); if (v instanceof Date) { sb.append("'").append(FMT.format(v)).append("'").append(","); } else if (isQuote(v)) { sb.append("'").append(v).append("'").append(","); } else if (isNoQuote(v)) { sb.append(i).append(","); } else { sb.append(fromObject(v)).append(","); } } len = sb.length(); if (len > 1) { sb.delete(len - 1, len); } sb.append("]"); return sb.toString(); } /** * list 集合 生成 * @author zhanglong * @param list 集合 * @return String */ @SuppressWarnings("unchecked") public static String listToStr(List<Object> list) { if (list == null) { return null; } StringBuffer sb = new StringBuffer(); sb.append("["); Object value = null; for (java.util.Iterator<Object> it = list.iterator(); it.hasNext();) { value = it.next(); if (value instanceof Map) { sb.append(fromObject((Map) value).toString()).append(","); } else if (isNoQuote(value)) { sb.append(value).append(","); } else if (isQuote(value)) { sb.append("'").append(value).append("'").append(","); } else { sb.append(fromObject(value).toString()).append(","); } } int len = sb.length(); if (len > 1) { sb.delete(len - 1, len); } sb.append("]"); return sb.toString(); } /** * 从一个bean装载数据，返回一个JsonUtil对象。 <br/> * @author zhanglong * @param bean 实体 * @return JsonUtils */ @SuppressWarnings("unchecked") public static JsonUtils fromObject(Object bean) { JsonUtils json = new JsonUtils(); if (bean == null) { return json; } Class cls = bean.getClass(); Field[] fs = cls.getDeclaredFields(); Object value = null; String fieldName = null; Method method = null; int len = fs.length; for (int i = 0; i < len; i++) { fieldName = fs[i].getName(); try { method = cls.getMethod(getGetter(fieldName), (Class[]) null); value = method.invoke(bean, (Object[]) null); } catch (Exception e) { e.printStackTrace(); continue; } json.put(fieldName, value); } return json; } /** * 从Map中装载数据 <br/> * @author zhanglong * @param map map * @return JsonUtils */ public static JsonUtils fromObject(Map<String, Object> map) { JsonUtils json = new JsonUtils(); if (map == null) { return json; } json.getMap().putAll(map); return json; } private static String getGetter(String property) { return "get" + property.substring(0, 1).toUpperCase() + property.substring(1, property.length()); } public Map<String, Object> getMap() { return this.jsonMap; } /** * 此处为方法说明 * @author zhanglong * @param args aa *//* public static void main(String[] args) { * Map<String,Object> map1 = new HashMap<String,Object>(); * map1.put("name", "zhanglong"); * map1.put("age", 2); * Map<String,Object> map2 = new HashMap<String,Object>(); * map2.put("name", "zhanglong"); * map2.put("age", 22); * util.put("map1", map1); * util.put("map2", map2); * List<Map<String,Object>> list = new LinkedList<Map<String,Object>>(); * list.add(map1); * list.add(map2); * util.put("listMap", list); * TestBean t = new TestBean("zhanglong","男"); * util.put("beanObject", t); * List<Integer> li = new LinkedList<Integer>(); * li.add(1); * li.add(1); * li.add(1); * util.put("listInteger", li); // System.out.println(JsonUtil.fromObject(map1)); JsonUtils util = new JsonUtils(); util.put("name", "zhanglong"); util.put("blog", "http://blog.csdn.net/flanet"); util.put("ttt", true); util.put("dd", 1.3d); util.put("ff", 1.3f); util.put("date", new java.util.Date()); int[] a = new int[] { 2, 3, 4, 5 }; util.put("arr", a); System.out.println(util); }*/}
