Json与Bean互转，Timestamp类型的问题

Json与Java Bean互相转换时,Bean中的Timestamp字段是无法直接处理的，需要实现两个转换器。

DateJsonValueProcessor的作用是Bean转换为Json时将Timepstamp转换为指定的时间格式。

import java.text.DateFormat;import java.text.SimpleDateFormat;import java.util.Date;import net.sf.json.JsonConfig;import net.sf.json.processors.JsonValueProcessor;/*** 将Bean中的Timestamp转换为json中的日期字符串*/public class DateJsonValueProcessor implements JsonValueProcessor {public static final String Default_DATE_PATTERN ="yyyy-MM-dd";private DateFormat dateFormat ;public DateJsonValueProcessor(String datePattern){try{dateFormat  = new SimpleDateFormat(datePattern);}catch(Exception e ){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){return dateFormat.format((Date)value);}}

 

TimestampMorpher的作用则与DateJsonValueProcessor相反，它是在Jsonl转换为Bean时，会把指定的时间格式转换为Timestamp

import java.sql.Timestamp;import java.text.ParseException;import java.text.SimpleDateFormat;import net.sf.ezmorph.MorphException;import net.sf.ezmorph.object.AbstractObjectMorpher;/*** 将json串中的日期字符串转换为bean中的Timestamp*/public class TimestampMorpher extends AbstractObjectMorpher {/*** 日期字符串格式*/private String[] formats;public TimestampMorpher(String[] formats) {this.formats = formats;}public Object morph(Object value) {if( value == null){return null;}if( Timestamp.class.isAssignableFrom(value.getClass()) ){return (Timestamp) value;}if( !supports( value.getClass()) ){throw new MorphException( value.getClass() + " 是不支持的类型");}String strValue=(String) value;SimpleDateFormat dateParser=null;for( int i = 0; i < formats.length ; i++ ){if( null == dateParser ){dateParser=new SimpleDateFormat(formats[i]);}else{dateParser.applyPattern(formats[i]);}try{return new Timestamp( dateParser.parse( strValue.toLowerCase()).getTime() );}catch (ParseException e) {//e.printStackTrace();}}return null;}@Overridepublic Class morphsTo() {return Timestamp.class;}public boolean supports( Class clazz ){return String.class.isAssignableFrom( clazz );}}public class JsonTest {public static void main(String[] args) {String jsonStr="{\"id\":\"101\",\"name\":\"张三\",\"age\":\"20\",\"birthday\":\"1992-10-19 23:52:18\"}";Student s=new Student();Timestamp b=Timestamp.valueOf("1992-10-19 23:52:18");s.setId(123456);s.setName("李四");s.setAge(20);s.setBirthday(b);Student s1=jsonToBean(jsonStr);System.out.println(s1.getBirthday());System.out.println(beanToJson(s));}public static Student jsonToBean(String json){String[] formats={"yyyy-MM-dd HH:mm:ss","yyyy-MM-dd"};JSONUtils.getMorpherRegistry().registerMorpher(new TimestampMorpher(formats));JSONObject jsonObject=JSONObject.fromObject(json);return (Student)JSONObject.toBean(jsonObject,Student.class);}public static String beanToJson(Student s){JsonConfig config=new JsonConfig();config.registerJsonValueProcessor(Timestamp.class, new DateJsonValueProcessor("yyyy-MM-dd HH:mm:ss"));JSONObject json=JSONObject.fromObject(s,config);return json.toString();}}