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Posted on 2015-02-14 09:58 RyanChan 阅读(61) 评论(0) 编辑 收藏
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。
1 import java.text.DateFormat;
2 import java.text.SimpleDateFormat;
3 import java.util.Date;
4 import net.sf.json.JsonConfig;
5 import net.sf.json.processors.JsonValueProcessor;
6 /*** 将Bean中的Timestamp转换为json中的日期字符串*/
7 public class DateJsonValueProcessor implements JsonValueProcessor {
8 public static final String Default_DATE_PATTERN ="yyyy-MM-dd";
9 private DateFormat dateFormat ;
10 public DateJsonValueProcessor(String datePattern){
11 try{
12 dateFormat = new SimpleDateFormat(datePattern);}
13 catch(Exception e ){
14 dateFormat = new SimpleDateFormat(Default_DATE_PATTERN);
15 }
16 }
17 public Object processArrayValue(Object value, JsonConfig jsonConfig) {
18 return process(value);
19 }
20 public Object processObjectValue(String key, Object value,JsonConfig jsonConfig) {
21 return process(value);
22 }
23 private Object process(Object value){
24 return dateFormat.format((Date)value);
25 }
26 }
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
1 import java.sql.Timestamp;
2 import java.text.ParseException;
3 import java.text.SimpleDateFormat;
4 import net.sf.ezmorph.MorphException;
5 import net.sf.ezmorph.object.AbstractObjectMorpher;
6 /*** 将json串中的日期字符串转换为bean中的Timestamp*/
7 public class TimestampMorpher extends AbstractObjectMorpher {
8 /*** 日期字符串格式*/
9 private String[] formats;
10 public TimestampMorpher(String[] formats) {
11 this.formats = formats;
12 }
13 public Object morph(Object value) {
14 if( value == null){
15 return null;
16 }
17 if( Timestamp.class.isAssignableFrom(value.getClass()) ){
18 return (Timestamp) value;
19 }
20 if( !supports( value.getClass()) ){
21 throw new MorphException( value.getClass() + " 是不支持的类型");
22 }
23 String strValue=(String) value;
24 SimpleDateFormat dateParser=null;
25 for( int i = 0; i < formats.length ; i++ ){
26 if( null == dateParser ){
27 dateParser=new SimpleDateFormat(formats[i]);
28 }else{
29 dateParser.applyPattern(formats[i]);
30 }
31 try{
32 return new Timestamp( dateParser.parse( strValue.toLowerCase()).getTime() );}
33 catch (ParseException e) {
34 //e.printStackTrace();
35 }
36 }
37 return null;
38 }
39 @Override
40 public Class morphsTo() {
41 return Timestamp.class;
42 }
43 public boolean supports( Class clazz ){
44 return String.class.isAssignableFrom( clazz );
45 }
46
47 }
测试一下。
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原文地址：http://www.cnblogs.com/dsgr1321/p/4291349.html
