从数据库取得的date类型为java.sql.date,如果直接放入list中,然后在转json数据的时候会出现异常,
net.sf.json.JSONException: java.lang.reflect.InvocationTargetException
一种解决办法是在放入list之前,直接转为java.util.date,但是这样在前台取不到值,因为格式不对,下面介绍我的之中方法:
java代码:
JsonConfig cfg = new JsonConfig(); cfg.registerJsonValueProcessor(java.util.Date.class,new DateJsonValueProcessor()); JSONArray jsonArray = JSONArray.fromObject(users,cfg);
DateJsonValueProcessor.java:
package servlet; import java.sql.Timestamp; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; 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"; private DateFormat dateFormat; public DateJsonValueProcessor() { this(DEFAULT_DATE_PATTERN); } 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 instanceof Timestamp) return dateFormat.format((Timestamp) value); else if (value instanceof Date) return dateFormat.format((Date) value); else if (value == null) return ""; else return value.toString(); } }