如下所示：
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/* * Created on Nov 4, 2016 * * TODO To change the template for this generated file go to * Window - Preferences - Java - Code Style - Code Templates */package com.suning.commerce.util;import java.sql.Date;import java.sql.Time;import java.sql.Timestamp;import java.util.Collection;import java.util.Iterator;import java.util.Map;import org.apache.commons.beanutils.BeanUtils;/** * @author nicholas tse * * TODO To change the template for this generated type comment go to Window - Preferences - Java - Code Style - Code Templates */public class JsonUtils { /** * * @param array * @return */ private static String array2Json(Object[] array) { if (array.length == 0) return "[]"; int i = array.length; StringBuffer sb = new StringBuffer(i << 4); sb.append('['); for (int j = 0; j < i; j++) { Object o = array[j]; sb.append(toJson(o)); sb.append(','); } // 将最后添加的 ',' 变为 ']': sb.setCharAt(sb.length() - 1, ']'); return sb.toString(); } private static String string2Json(String s) { StringBuffer sb = new StringBuffer(s.length() + 20); sb.append('\"'); for (int i = 0; i < s.length(); i++) { char c = s.charAt(i); switch (c) { case '\"': sb.append("\\\""); break; case '\\': sb.append("\\\\"); break; case '/': sb.append("\\/"); break; case '\b': sb.append("\\b"); break; case '\f': sb.append("\\f"); break; case '\n': sb.append("\\n"); break; case '\r': sb.append("\\r"); break; case '\t': sb.append("\\t"); break; default: sb.append(c); } } sb.append('\"'); return sb.toString(); } public static String toJson(Object o) { if (o == null) { return "null"; } else if (o instanceof String) { return string2Json((String) o); } else if ((o instanceof Boolean) || (o instanceof Number)) { return o.toString(); } else if ((o instanceof Date) || (o instanceof Time)||o instanceof Timestamp) { return o.toString(); } else if (o instanceof java.util.Date) { return DateUtil.formatDate((java.util.Date)o,"yyyy-MM-dd HH:mm:ss"); } else if (o instanceof Map) { return map2Json((Map) o); } else if (o instanceof Object[]) { return array2Json((Object[]) o); } else if (o instanceof Collection) { return array2Json(((Collection) o).toArray()); } else { try { Map describe = BeanUtils.describe(o); return map2Json(describe); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } throw new RuntimeException("Unsupported type: " + o.getClass().getName()); } /** * * @param map * @return */ private static String map2Json(Map map) { if (map.isEmpty()) return "{}"; StringBuffer sb = new StringBuffer(map.size() << 4); sb.append('{'); Iterator iterator = map.keySet().iterator(); while (iterator.hasNext()) { Object key = iterator.next(); Object value = map.get(key); sb.append('\"'); sb.append(key); sb.append('\"'); sb.append(':'); sb.append(toJson(value)); sb.append(','); } // 将最后的 ',' 变为 '}': sb.setCharAt(sb.length() - 1, '}'); return sb.toString(); }} |
