json-lib date对象转json ，加入自定义日期格式处理

import net.sf.json.JSONObject;import net.sf.json.JsonConfig;import net.sf.json.processors.JsonValueProcessor;public class DateJsonValueProcessor implements JsonValueProcessor {public static final String DEFAULT_DATE_PATTERN = "yyyy-MM-dd HH:mm:ss";private DateFormat dateFormat;/**   * 构造方法.   *   * @param datePattern 日期格式   */public DateJsonValueProcessor(String datePattern) {try {dateFormat = new SimpleDateFormat(datePattern);} catch (Exception ex) {dateFormat = new SimpleDateFormat(DEFAULT_DATE_PATTERN);}}public Object processArrayValue(Object value, JsonConfig jsonConfig) {return process(value);}public Object processObjectValue(String key, Object value,JsonConfig jsonConfig) {return process(value);}private Object process(Object value) {if (value == null) {value = new Date();   //为null时返回当前日期，也可以返回"",看需要}return dateFormat.format((Date) value);}public static String map2JSonStr(Map map) {JsonConfig jsonConfig = new JsonConfig();DateJsonValueProcessor beanProcessor = new DateJsonValueProcessor(DEFAULT_DATE_PATTERN);jsonConfig.registerJsonValueProcessor(Date.class, beanProcessor);JSONObject jsonObject = JSONObject.fromObject(map, jsonConfig);return jsonObject.toString();}//将对象转换为json string，使用上面定义的的日期格式@SuppressWarnings("unchecked")public static JSONObject obj2JsonObj(Object obj) {JsonConfig jsonConfig = new JsonConfig();DateJsonValueProcessor beanProcessor = new DateJsonValueProcessor(DEFAULT_DATE_PATTERN);jsonConfig.registerJsonValueProcessor(Date.class, beanProcessor);JSONObject jsonObject = JSONObject.fromObject(obj, jsonConfig);return jsonObject;}}

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